General telephone & electronics Automatic electric p-a-x User manual

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AUTqMATIC

ELEC'fRIC

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g~1uzation

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qesigning,

engineering,

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pecialists

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com

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muni~ation,

~lectrical

control,

and

allied

arts.

Fp~

mor~

tf1an

sixty

years

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company

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originator

a.

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parer\.t

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mai1ufactuter

of

tli.,e.-

Sti;ow~er

Autli>mati.c

Telephon~

System.

Today

Strowgei;-type

equipm~n~

serves

over

7So/o

of'

the

-

world's

,

autom;i.ti~

telephones.

T.Qe

same

experience

and

technique

that

'

have

grown

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of

the

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work

of

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Electrfc

'engi-

neers

i[t th,e'

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tef~phone

e~nU'nuni~ation

are

a's~

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b~iµg

suc~s~fully

applied

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pn

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s~ale-

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so'lutioft

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PRODU(:TS

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Strowger

Automattc

Tek!phon,e

Systef1u

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15-,

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11nd

with

faeilities

for

speci~l

services

to

meet

ffie

needs

-0£

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user.

1

control

(

'plt:te

allto~natic

cen~rariffi•~e

equipment

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for

ex· ,

change

uea.1

of

any<

size, froni

small

towns

to

th«;

largest)11etropolitan

ntlWo~ks.

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P.B:X.

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Switdiboards-A

complrte

range

of

cord-

less

and

<·o):d

types

for

the

inodern

1:i.1sjness. \

Commwiity

,

Arttdmatic

Exchangu-Una~tel'jded

automatic

un

.its .for

s1~iaJI

rural.,or

suburban

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Tel~phone

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desig,ns

fo1:.

autornatjc

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manual

exchanges.,

inclt1ding

the

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world's

most

attractive

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handset

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toll

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resulting

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simplififation

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app

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the

Private

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•oma-ti'<

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in

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111aipte11anee

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companie5,

telephone

app8,ratus

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railroads

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telephone

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TCI Library www.telephonecollectors.info

TABLE

OF

CONTENTS

Section

1.

INTRODUCTION.

1. 1

Scope

of

Publication

.

1. 2

P-A-X

Equipment

1. 3

Station

Equipment

1. 4

The

P-A-X

1. 5

Building

Wiring

.

2.

TOOLS

AND

TEST

MATERIAL

2.

1

Tools

.

2.

2

Maintenance

Materials

2.

3

Hand

Test

Telephone

3.

LUBRICATION

.

4.

PREVENTIVE

MAINTENANCE

4.

1

Maintenance

Procedures

4.

2

Performing

Preventive

Maintenance

5.

STATION

SUBSCRIBER

COMPLAINTS

5. 1

5.

2

5. 3

-5. 4

5. 5

5.6

Classes

of

Complaints

Class

1

Complaints

Class

2

Complaints

.

Class

3

Complaints

.

Class

4

Complaints

.

Investigation

of

Complaints

and

Correction

6.

TROUBLE

SHOOTING

6.

1

General

6.

2

General

Notes

6.

3

Using

the

Test

Lamp

6.

4

Using

the

Ground

Cord

6.

5

Testing

Tone

and

Ringing

Circuits

7.

REMOVAL

OF

COMPONENTS

AND

PARTS

7.

1

Removal

of

Line

switch

. .

7.

2

Removal

of

Strowger

Switches

.

7.

3

Relay

Removal

7.

4

Type

45

Rotary

Switch

Removal

7.

5

Lamp

Removal

7.

6

Fuse

Removal

. . . . . .

7.

7

Alarm-indicating

Power

Fuse

Repair.

8.

PERIODIC

INSPECTION

AND

READJUSTMENT

OF

RELAYS

AND

SWITCHES

.

9.

ROUTINE

TESTS

Page

1

2

4

5

6

8

10

11

17

18

21

•

21

.

21

.

21

22

23

25

.

25

27

•

30

TCI Library www.telephonecollectors.info

COMMON

LINE

AND

DISTRIBUTION

FINDER

SWITCHES

(FRS)

RELAYS

(CLAD)

-~~L..;.;~

RINGING

INTERRUPTER

---~~~Iii

RINGING

CONVERTER

TONE

EQUIPMENT

TONE

TRANSFORMER

RINGING

TRANSFORMER

VOLTMETER

CONNECTOR SWITCHES

(CRS)

Fi

g

ur

e 1.

Typical

rotar

y

-typ

e

P-A-X

.

FINDER

CO

NNECTOR

LINKS

(FC

LINK

)

TEST

BINDING

POSTS

AMMETER

24

VOLT

BATTERY

CHARGER

TCI Library www.telephonecollectors.info

GENERAL

MAINTENANCE

OF

P-A-X's

1.

INTRODUCTION

All

Privatf'

Automatic

Exchanges

(P-A-X)

manufactured

by

Automatic

Electric

Company

:1.r0

ruggt·'dly

constructed

(figure

1),

designed

for

long

use,

and

require

very

little

attention.

;\

:-,u

..

i!:

amount

of

maintenance

is

required

at

n·guL.u·

inter

vais

lo

forestall

possible

service

int

nTuptions.

Minor

defects

can

be

detected

•

.L1d

cc;rrcC'ted

before

they

develop

into

a

serv-

ice

e:ompla

int.

Thih

puf>lica

ti.on

is

directed

pl'imarily

toward

personnel

who

maintain

the

rotary

;:;witch

and

relay

switching

components

of

the

i'"A-'<.

i .1

S·.·ope

of

F'ublication

This

publication

includes

maintenance

instruc-

tions

for

all

components

of

all

P-A-X's.

Instructions

for

cleaning,

adjusting,

removing,

and

repairing

relays

and

rotary

switches

are

applicable

to

a

majority

of

the

components

and

therefore

are

given

only

once.

For

detailed

theory

of

operation

of

your

P-A-X,

refer

to

the

technical

bulletin

supplied

with

the

equipment.

1 .2

P-A-

X

Equipment

An

isolated

dial

telephone

system

consists

of

three

distinct

components

as

shown

on

figure

2.

a.

The

first

component

is

the

station

equip-

·ment

which

is

designated

as

the

"A"

equipment.

"A"

EQUIPMENT

"c"

EQUIPMENT

+

b.

The

second

component

is

the

P-A-X

equip-

ment

which

is

designated

as

the

"B"

equipment.

c.

The

third

component

is

the

building

wiring

which

is

designated

as

the

"C"

equipment.

1.3

Station

Equipment

rr11e

telephone,

designated

as

the

''A"

eq11ip-

ment

in

figure

2,

is

represented

in

figure

3.

With

the

handset

on

its

cradle,

the

hooks

witch

places

the

ringer

and

its

associated

capacitor

in

series

across

the

line,

or

from

one

sidf~

of

the

line

to

ground

when

party

line

service

is

required.

The

capacitor

blocks

the

flow

of

the

d-c

switchboard

battery

in

the

ringer

coils

to

prevent

a

shorted

or

''permanent''

line.

However,

the

P-A-Xringingconverter

supplies

a

20-cycle

signaling

source

which

flows

through

the

capacitor

to

operate

the

station

ringer

and

signal

the

called

party.

This

ringing

current

is

supplied

over

the

(+)side

of

the

line,

through

the

ringer

coils

and

capacitor,

to

either

ground

at

the

instrument

or

back

over

the

(-)

side

of

the

line

to

the

P-A-X

(-)

battery

and

ground

through

the·

ringing

relay.

Removal

of

the

handset

causes

the

hookswitch

to

open

the

ringer

circuit,

and

the

ringing

cut-off

relay

of

the

P-A-X

conversation

link

operates

to

stop

the

ringing.

To

make

a

call,

remove

the

handset.

This

places

the

dial

pulse

springs

in

series

with

the

•a•

EQUIPMENT

ISOLATED

DIAL

TELEPHONE

SYSTEM

Figure 2. Isolated dial telephone

system.

1

TCI Library www.telephonecollectors.info

HANDSET

TRANS

UNIT DESK STAND

•

TRANSMITTER

.

x·r----0---

...

IMPULSE

SPRINGS

ITERM.

BLK.

LI

HDOKSWITCH

RINGER

USE

"z"

WIRING

FOR BRIDGED

RINGING

•z•

'i

4 G

\

Fi/,7tre 3.

Typical

wiring

diagram

of

a tcleplw11e set.

transmitter

across

the

line

to

the

P-A-X,

completing

a

d-c

loop.

The

switchboard

equip-

ment

is

seized,

dial

tone

is

heard,

and

the

desired

number

can

be

dialed.

While

in

its

off-normal

position,

the

dial

shunting

springs

will

short-circuit

the

transmitter

to

prevent

dial

clicks

in

the

receiver

and

also

to

prevent

the

variable

resistance

of

the

transmitter

from

affecting

the

dial

pulses.

The

dial

pulse

springs

interrupt

the

circuit

to

the

P-A-X

a

number

of

times

equal

to

the

digit

dialed

to

select

the

desired

party.

The

equipment

is

released

when

the

handset

is

restored.

This

is

the

general

operation

of

the

telephone.

A

detailed

wiring

diagram

is

located

inside

the

assembly

and,

with

it,

each

wire

can

be

traced

and

identified.

No

special

tools

are

required

for

repair

except

a

screw-

driver

and

a

pair

of

dial

pliers.

1.4

The

P-A-X

The

P-A-X

designated

the

"B"

equipment

in

figure

2,

consists

of

the

following

three

inter-

to

form

a

switchboard

(see

figure

4).

1.4.1

The

individual

line

equipment.

This

group

of

identical

units,

required

for

each

telephone

line,

consists

of

line

relays.

The

two

wires

from

each

telephone

terminate

in

the

switchboard

at

a

line

relay.

When

a

subscriber

2

closes

the

circuit

to

the

line

relay

by

lifting

his

handset,

the

relay

operates

and

starts

the

linefinder

hunting

for

an

idle

connector.

In

some

P-A-X's,

a

lineswitch

is

used

in

place

of

a

line

relay

and

line

finder.

In

this

instance,

the

subscriber

lifts

his

handset

and

closes

the

circuit

to

a

lineswitch.

The

lineswitchoperates

automatically

and

connects

the

calling

line

to

an

idle

connector

trunk.

A

lineswitch

is

required

for

each

station.

The

functions

of

a

lineswitch

are:

a.

To

extend

the

line

through

to

an

idle

con-

nector

trunk.

b.

To

busy

the

line

at

the

connector

bank

terminals

to

incoming

calls

immediately

upon

operation

of

the

line

switch

relay.

c.

To

restore

itself

to

normal

when

the

connector

is

released.

The

type

27

plunger

lineswitch

used

in

some

P-A-X's

consists

of

a

line

relay

and

an

oper-

a

ting

coil

which

activates

an

armature

carrying

a

plunger.

Details

of

the

type

27

lineswitch

are

fully

described

in

bulletin

805,

copies

of

which

will

be

furnished

upon

request

from

Automatic

Electric

Sales

Corporation.

1.4.2

Conversation

links.

The

conversation

links

consist

of

linefinders

and

connectors.

The

number

of

each

depends

TCI Library www.telephonecollectors.info

on

the

size

of

the

P-A-X.

The

linefinder

and

its

associated

connector

form

a

linefinder-

connector

link

(conversation

path).

a.

The

linefinder.

Some

P-A-X'susearotary

type

linefinder

while

others

use

a

Strowger

type.

When

a

linefinder

is

seized,

it

hunts

for

and

connects

an

idle

connector

to

the

calling

party

line.

At

this

point,

circuit

operation

causes

the

distributor

switch

to

advance

its

wipers

ahead

to

the

link.

The

mechanical

components

of

a

Strowger

linefinder

include

a

shaft,

and

a

ratchet

mechanism

for

raising

and

rota

ting

the

shaft.

Its

electrical

components

include

control

relays,

vertical

and

rotary

stepping

magnets,

and

a

magnet

which

releases

the

ratchet

mechanism.

b.

The

connector.

Under

guidance

of

the

calling

party.

the

connector

functions

as

an

operator

via

the

telephone

dial.

Connectors

used

in

P-A-

X's

are

the

Strowger

type

and

in

some

cases

the

rotary

switch

type.

The

COMMON

EQUIPMENT

DISTRIBUTOR

SWITCH

Strowger

type

connector's

mechanic

a 1

components

include

a

shaft,

a

ratchet

mechanism

for

raising

and

rotating

the

shaft,

and

two

sets

of

wipers

(termed

the

line

and

control

wipers).

Its

electrical

components

include

several

control

relays,

vertical

and

rotary

stepping

magnets.

and

a

magnet

which

releases

the

ratchet

mecha-

nism.

The

bank

contacts

at

the

bottom

of

the

connector

are

the

terminals

of

the

t e 1e

phone

lines

which

the

connector

serves.

Each

contact

is

multipled

to

each

connector

bank

so

that

all

connectors

can

have

access

to

any

of

the

telephone

lines.

In

response

to

dial

pulses,

the

connector

raises

its

wipers

to

the

dialed

level

and

across

to

the

dialed

level

contact

which

is

the

called

party's

line.

When

the

connector

is

released,

the

switch

shaft

is

restored

to

its

normal

position.

The

connector

func-

tions

are:

(1)

Upon

seizure.

to

hold

equipment

behind

and

busy

out

the

calling

party's

line.

-----------

TONE

RELAYS

FROM

CALLING

STATION

DISTRIBUTOR

RELAY

GROUP

LINE

ANQ

CORLY

INDIVIDUAL EQUIPMENT

RINGING

EQUIPMENT

-----------INTERRUPTER

EQUIPMENT

=-i

FINDER

SWITCH

CONNECTOR

CONVERSATION LINKS

Figure

4.

Schematic

of

a dial

system.

I

TO

DIST

RLY

GRP

LINE

AND

CORLY

TO FINDER

SWITCH BANKS

TO

CALLED

STATION

INDIVIDUAL EQUIPMENT

3

TCI Library www.telephonecollectors.info

(2)

To

start

and

stop

the

switchboard

com-

mon

equipment

as

required.

(3)

To

return

a

husy

tone

to

the

calling

party

when

the

dialed

line

is

busy.

(4)

To

ring

the

called

party's

telephone

and

return

ring-back

tone

to

the

calling

party.

(5)

To

stop

ringing

when

the

called

party

answers

and

supply

talking

battery

for

both

parties.

(

6)

To

release

after

the

calling

party

has

restored

his

handset.

(7)

To

prepare

the

release

alarm

signal

if

the

mechanism

fails

to

reston~

properly.

1.4.3

Common

equipment.

a.

Distributor

group.

The

distributor

group

is

a

switch

consisting

of

control

relays

[or·

the

lirwfinders

and

a

rotary

switch.

The

distributor

switch

preselects

and

assigns

dialing

links

successively

to

incoming

calls.

Only

one

distributor

switch

is

needed.

After

a

previously

assigned

link

has

been

seized,

il

irnmedialely

allots

the

link

for

another

incoming

call.

The

di8trihutor

switch

passes

over

bank

contacts

of

busy

links.

When

all

links

are

in

nsr:,

th0

dis

l.r

:bu

tor·

switch

rotates

to

its

home

position

rt'ady

to

advance

inunedi-

<.L

tely

to

thv

bank

contacts

of

the

first

link

to

become

idle.

b.

Master

switch.

When

a

plunger

type

lineswitch

is

used

in

place

of

line

re-

lays

and

linefinders,

the

common

equip-

ment

consists

of

a

master

switch

instead

of

the

distributor

group.

The

position

of

the

plungers

of

each

group

of

line-

switches

is

controlled

by

a

mechanism

termed

a

master

switch.

The

control

is

through

the

movement

of

the

plunger

guide

shaft.

The

prime

function

of

the

control

is

to

keep

the

plunger

of

all

idle

lineswitches

resting

opposite

the

bank

contacts

of

an

idle

trunk.

Each

time

a

trunk

is

engaged,

the

master

switch

immediately

moves

all

the

remaining

idle

lineswitch

plungers

to

a

position

opposite

an

idle

trunk.

The

plunger

type

lineswitch

is

thus

preselecting

in

operation;

that

is,

the

idle

trunk

is

selected

prior

to

a

call.

c.

Ringing

converter.

A

portion

of

the

P-A-X

power

supply

is

converted

into

an

a-c

source

for

operating

the

telephone

ringers

via

the

connectors.

4

d.

P.

f.

Ringing

interrupterso

An

a-c

so11rce

is

interrupted

and

delivered

to

the

connec-

tors

for

ringing

the

called

telephone

lines.

The

tone

relay

and

interrupter.

A

portion

of

the

P-A-X

power

supply

is

converted

into

a

steady

dial

tone

or

interrnp!ed

husy

tone

and

is

supplied

totheca!lingpartyvia

the

connector

as

required.

Supervisory

alarm

equipment.

The

signal

larnps

and

associated

relays

of

the

P-A-X

supervisory

alJi·rn

~';\1:,:tcrn

arc

found

on

the

individual

apparcttw;

shelves

which

they

supervise.

A

buzzer

provides

a

general

alarm

to

all

shelf

units.

The

supervisory

aL1nn

equipment

operates

as

follows:

(1)

Power-supply

shelf.

A

glowing

rc!d

lamp

indicates

a

blown

fuse.

!\

glowing

white

lamp

indicates

the

failure

of

the

charging

equipment

to

deliver

current

to

the

storage

battery

(if

any)

when

the

charge

control

relay

operates.

(2)

Lineswitch

shelf.

A

glowing

red

lamp

indicates

a

blown

fuse.

A

glowing

white

lamp

indicates

that

all

lineswitch

trunk

outlets

are

busy.

(3)

Connector

shelf.

/\

glowit1g

red

lamp

indicalPs

a

hlown

fiisc.

;\

~~lo1Aing

g-r0en

larnp

indicates

the

failu1·cofar.

CH1rw··'.rn·

tn

release.

g.

The

power

control

panel.

The

power

control

panel

ordinarily

includes

a

volt-

meter

for

determining

the

potential

of

the

power

supply,

an

ammeter

for

determining

the

load

on

the

switchboard,

a

charge

and

discharge

fuse,

and

a

number

of

alarm

fuses.

h.

Power

supply.

Normally

a

battery

elimi-

nator

is

used

and

is

supplied

with

the

P-A-X

when

specified.

This

apparatus

draws

alternating

current

from

a

standard

110

volt

a-c

outlet

(or

from

a

220

volt,

a-c

outlet)

and

converts

it

to

direct

current.

In

some

cases,

a

battery

is

used

(dry

cells

or

wet

cells).

When

wet

cells

are

used,

a

battery

charger

should

be

used

with

the

battery

and

is

supplied

when

specified.

1.5

Building

Wiring

The

building

wiring,

designated

as

the

"C"

equipment

of

figure

2,

consists

of

all

facilities

used

to

connect

the

station

equipment

to

the

P-A-X.

This

portion

of

the

telephone

system,

that

is

any

electrical

circuit,

should

be

kept

dry.

TCI Library www.telephonecollectors.info

2.

TOOLS

AND

TEST

MATERIAL

This

section

lists

the

tools

and

materials

required

for

maintaining

a

P-A-X.

The

manufacturer's

part

number

is

stamped

on

most

of

the

tools

to

help

identification.

Techni-

cal

bulletin

540

lists

all

maintenance

tools

and

contains

tool

illustrations

which

are

referenced

below.

2.1

Tools

The

tools

generally

required

to

properly

maintain

P-A-X

equipment

are

listed

below:

TABLE

A:

P-A-X

EQUIPMENT

TOOLS

A.

E.

Co.

Item

Use

Number

H-14768

Armature

Relays

with

short-

Adjuster

lever

armatures.

H-

88502-

1

Armature

Relays

with

long-

Adjuster

lever

armatures.

H-88504-1

Spring

Relays

with

Adjuster

stationary

springs.

1{-88504-2

Spring

Relays

with

moving

Adjuster

springs.

H-882553-1

Contact

Cleaning

relay

Cleaner

contacts.

H-882568-2

Lamp

Removing

Extractor

switchboard

lamps.

H-

883114-

1

Lamp

Cap

Removing

lamp

caps.

Extractor

H-

14315-

1

Fuse

Repair

of

alarm-

Kit

indicating

fuses.

H-46795-

1

Thickness

Residual

screw

Gages

adjustment.

H-16339-1

Test

Lamp

For

48v

de

continuity

tests.

H-880922-1

Inspection

Gaging

of

relay

Lamp

contacts.

H-50619

Long

Nose

General

usage.

Pliers

H~22945

Diagonal

General

usage.

Cutting

Pliers

H-50620

Duckbill

Rotary

switch

inter-

Pliers

rupter

and

wiper

adjusting.

H-16290-

7

Dial

Pliers

Spring

adjusting.

H-21766

Offset

Air

gap

adjustment.

Screwdriver

H-24664

Screwdriver

General

usage.

H-7062

Open-end

Residual

screw

Wrench

lockout.

H-7063

Open-end

For

adjusting

rotary

Wrench

switches.

TL-117

Soldering

Iron

General

usage.

H-56628-4

Cleaning

Tool

Rotary

switch

banks.

H-16590-1

Cleaning

Tool

Strowger

switch

banks.

H-26917

Dial Dial

disassembly.

Escutcheon

Tool

H-74573-1

Ground

Cord

Verifying

open

d-c

circuits.

2

.2

Maintenance

Materials

The

most

commonly

used

maintenance

mate-

rials

required

for

general

maintenance

of

a

P-A-X

are

as

follows:

TABLE

B:

P-A-X

MAINTENANCE

MATERIALS

A.

E.

Co.

Item

Use

Number

H-880843-1

No. 4

Sable

Lubrica-

Brush

ti

on.

1/2"

Camel's

Relay

Hair

Brush

dusting.

Cheesecloth

Cleaning

exterior

D-542539-B

Oiled

Switch

Sleeving

bank

cleaning

Orange

Stick

General.

Solder

General

repair.

Tape,

General

TL-83,

3/

4"

taping.

Twine

8

Cable

and

11

repair.

Play

H-88844-1

Bank

Strowger

Cleaning

switch

Brush

banks.

2

.3

Hand

Test

Telephone

The

basic

hand

test

telephone

designed

for

station

repairmen

is

the

A.

E.

Co.

No.

L-965.

The

L-965-A2

(figure

5)

hand

test

telephone

is

the

basic

L-965

with

a

test

cord

and

two

test

clips

attached

that

can

be

snapped

onto

line

wires,

terminal

screws,

and

ground

con-

nections

(such

as

a

cable-terminal

box),

etc.

The

L-965-AO

hand

test

telephone

is

equipped

with

a

test

plug

which

can

be

inserted

into

Strowger

switch

test

jacks.

Figure

5.

Hand

test

telephone.

5

TCI Library www.telephonecollectors.info

3.

LUBRICATION

The

purpose

of

lubrication

is

to

provide

a

film

of

lubricant

between

fixed

and

moving

or

two

moving

surfaces

to

reduce

friction

and

wear.

Avoid

excessive

lubrication,

since

too

much

lubricant

can

be

just

as

harmful

as

not

enough.

Remove

any

excess

lubricant

by

wiping.

All

components

that

require

periodic

lubrication

are

listed

in

technical

bulletin

505.

4.

PREVENTIVE

MAINTENANCE

Preventive

maintenance

consists

of

a

series

of

routine

inspections

which

provides

insurance

against

operational

failures

and

major

repairs.

These

routine

inspections

are

a

systematic

series

of

operations

performed

on

equipment

at

regular

intervals.

They

are

designed

to

eliminate

major

breakdowns

and

unwanted

interruptions

in

service

and

to

keep

the

equip-

ment

operating

at

top

efficiency.

The

inpor-

tance

of

preventive

maintenance

cannot

be

overemphasized.

Preventive

maintenance

differs

from

repair

in

that

it

is

intended

to

prevent

breakdowns,

and

therefore,

eliminate

the

need

for

repair.

On

the

other

hand,

the

prime

purpose

for

trouble

shooting

and

repair

is

to

locate

and

correct

existing

faults.

4.1

Maintenance

Procedures

Most

of

the

electrical

and

mechanical

parts

used

in

P-A-X

systems

(equipment)

require

routine

maintenance,

but

differ

in

the

amount

and

kind

required.

The

age

of

tht'

equipment

and

the

conditions

under

which

it

must

operate

govern

the

frequency

of

maintenance

tests

and

inspections.

An

accurate

fault

statistics

file

will

show

whether

preventive

maintenance

is

applied

properly.

A

person

performing

mainte-

nance

on

P-A-X

equipment

should

become

thoroughly

familiar

with

the

indications

of

normal

functioning

so

that

he

can

recognize

the

first

signs

of

defective

equipment.

To

detect

minor

defects

and

signs

of

worn,

damaged,

or

corroded

parts

which

may

later

cause

trouble,

a

visual

periodic

inspection

should

be

made.

Although

these

minor

defects

may

not

have

interfered

with

the

performance

of

the

equip-

ment,

correcting

them

before

they

lead

to

major

breakdowns

saves

valuable

time

and

effort.

Periodic

inspection

consists

of

observing

all

parts

of

the

equipment

during

operation.

It

is

advisable

to

inspect

for

the

following

condi-

tions:

a.

Overheating.

Look

for

discoloration,

blistering,

or

bulging

of

the

parts

or

surfaces

of

a

cover,

leakage

of

insulating

compound,

and

oxidation

of

metal

contact

surfaces.

b.

Placement,

See

that

leads

and

cabling

are

in

their

original

positions,

that

insulation

6

has

not

become

damaged,

and

that

soldered

connections

are

in

good

condition.

c.

Cleanliness.

Examine

carefully

all

re-

cesses

in

the

unit

for

accumulation

of

dust,

especially

between

the

connecting

termi-·

nals.

Parts,

connections,

and

joints

should

be

free

of

dust

and

other

foreign

matter.

d.

Tightness.

Any

connection

or

mounting

that

appears

to

be

loose

should

be

checked.

Screws,

nuts,

and

bolts

should

not

be

tightened

carelessly

(fittings

tightened

beyond

the

pressure

for

which

they

are

designed

will

be

damaged

or

broken).

Do

not

confuse

the

adjusting

screws

with

mounting

screws.

Perform

cleaning

oper-

ations

carefully,

in

order

not

to

damage

the

equipment

or

change

its

adjustment.

e.

Lubrication.

Observe

the

amount

of

lubricant

on

all

moving

parts

requiring

lubrication.

4.2

Performing

Preventive

Maintenance

4.2

.1

Inspection.

Inspect

all

units

regularly

to

prevent

needless

interruptions

in

service.

Check:

a.

Relay

coils

and

rotary

switch

coils

for

discoloration,

blistering,

and

bulging.

b.

Transformer

and

choke

coils

for

discol

-

oration1

blistering,

and

bulging.

c.

Contacts

for

oxidation,

pitting,

dirt,

dust,

and

lint.

In

high

humidity

locations,

look

for

fungus

growth

and

mildew.

d.

Covers,

cables,

leads,

and

individual

parts

to

see

that

they

are

in

their

original

positions,

securely

fastened,

and

are

not

frayed

or

broken.

4

.2.2

General

office

care.

a.

Keep

dirt,

dust,

and

moisture

out

of

the

P-A-X

room.

Dust

and

dirt

cause

excessive

equipment

failures,

since

it

eventually

filters

into

the

working

parts.

Moisture

and

humidity

also

cause

equip-

ment

failures

through

rust

and

corrosion

of

metal

parts,

or

electrolysis

and

insula-

tion

leakage

in

electrical

apparatus.

Keep

all

parts

of

the

room

as

clean

as

possible.

Linoleum

or

similar

floor

covering

is

desirable.

Keep

it

lightly

waxed

and

clean

it

at

regular

intervals

with

a

mop

dampened

lightly

with

water.

For

rooms

without

floor

covering,

use

a

push

broom

and

sweeping

compound.

Remove

accumulated

dust

and

TCI Library www.telephonecollectors.info

b.

dirt

from

the

equipment

with

a

clean,

lint-

free

cloth.

Use

a

camel's

hair

brush

to

remove

dust

from

relays

or

switchassem-

blies

where

space

is

limited.

Ventilation.

Outside

air

drawn

into

the

P-A-X

room

must

be

passed

through

filters.

Only

filtered,

dust-free

air

should

be

circulated

in

the

room.

Seal

all

windows,

unnecessary

doors

or

other

openings

to

prevent

entrance

of

dirt-

bearing,

unfiltered

air.

Inspect

the

air

filters

frequently.

The

use

of

air

condi-

tioning

eliminates

the

need

for

outside

ventilation.

c.

Humidity.

When

high

humidity

prevails,

the

equipment

must

be

protected

from

moisture

damage.

Relative

humidity,

an

expression

for

the

moisture

content

of

the

air,

is

the

ratio

of

moisture

actually

present

in

a

given

volume

of

air

compared

to

the

maximum

which

the

air

can

evapo-

rate

and

hold.

Heating

the

air

increases

its

capacity

to

evaporate

and

hold

moisture

and,

therefore,

reduces

the

relative

hll-

midity.

When

air

cools,

its

capacity

to

hold

moisture

is

reduced,

causing

its

relative

humidity

to

rise.

If

warm

moist

air

comes

in

contact

with

cold

equipment,

the

sudden

cooling

causes

it

to

deposit

its

moisture

in

the

form

of

dew.

To

avoid

moisture

troubles,

keep

the

relative

hu-

midity

below

60%

and

never

above

70%.

Use

hygrometers,

one

indoors

and

one

out-

doors,

to

provide

accurate

readings

of

humidity

conditions.

d.

Air

conditioning.

A

unit

type

air

condi-

tioner,

using

a

refrigerated

cooling

sys-

tem,

provides

the

most

effective

protection

against

high

humidity.

Air

from

the

P-A-X

room

is

circulated

over

the

cooling

coils,

giving

up

its

moisture,

and

is

returned

to

the

room

through

a

dust

filter.

The

resultant

dry,

dust-free,

and

cooled

air

insures

the

best

equipment

performance.

For

the

very

small

P-A-X's,

there

is

available

a

unit

type

chemical

dehumid-

ifier

which

will

reduce

the

content

of

moisture

in

the

air

without

the

use

of

a

refrigerated

cooling

system.

e.

Battery.

Wipe

the

battery

jars,

con-

nections

and

surrounding

parts

with

a

dry

cloth.

If

the

terminals

or

connections

are

corroded,

scrape

clean,

wash

them

with

soda

solution

(one

pound

of

bicar-

bonate

of

soda

to

a

gallon

of

water),

dry,

and

coat

them

with

a

thin

layer

of

vase

line.

Add

distilled

water

to

the

batteries

as

required

to

maintain

the

proper

electrolyte

level

within

the

cells.

See

the

manufacturer's

literature

for

complete

details

of

battery

care.

f.

Relay

contacts.

Clean

dirty

relay

contacts

with

a

fast

drying

fluid,

such

as

alcohol

or

chlorothene,

before

being

polished.

Car-

bon

tetrachloride

is

not

recommended.

Clean

the

contacts

with

contact

cleaning

tool

H-882553-1

or

a

similar

cleaner.

Never

use

a

rough-surfaced

object

for

con-

tact

cleaning

as

it

will

remove

contact

ma-

terial.

Do

not

use

cloth

or

paper

as

a

substitute

for

the

contact

cleaner,

since

both

have

insulating

lint

on

the

contact

sur-

face.

Clean

or

polish

the

contacts

by

hold-

ing

adjacent

contacts

together

and

running

the

cleaner

between

them

several

times.

g.

Rotary

switch

contacts.

Rotary

switch

bank

contacts

are

designed

so

as

not

to

require

any

lubrication

or

cleaning

for

the

life

of

the

switch.

In

the

event

that

it

becomes

necessary

to

replace

a

wiper

assembly,

the

bank

contacts

should

be

cleaned

as

a

preventive

measure

before

replacing

the

assembly.

Use

bank

clean-

ing

tool

H-56628-4

with

an.

oiled

sleeving.

Rotate

the

tool

between

the

rows

of

the

bank

contacts.

Clean

the

outside

of

the

two

outside

rows

by

gently

pressing

the

tool

toward

the

center

of

the

bank

while

rotating

the

tool.

After

cleaning,

lubricate

the

wiper

tips.

h.

Cleaning

and

oiling

of

Strowger

switches.

Busy

out

the

link

associated

with

the

con-

nector

during

cleaning

or

oiling.

Clean

and

oil

the

bearings,

shaft,

and

the

vertical

and

rotary

teeth

at

least

once

a

year.

Use

lubricating

material

supplied

with

the

installation.

Clean

the

release

magnet

coil

core

and

armature.

Brush

off

the

conrtector

bank

contacts

with

bank

cleaning

brush

H-88844-1

or

2.

Clean

and

oil

Strowger

switches

once

a

year

with

clean-

ing

tools

H-16590-1

or

2

and

the

oiled

webbing

supplied

with

the

P-A-X.

Do

not

damage

the

bank

insulators

and

switch

wipers.

Keep

bank

collars

in

place

and

bank

nuts

tight.

The

banks

must

not

drop

down

on

their

bank

rods.

4 .2

.3

The

building

wiring.

The

following

is

a

list

of

suggested

wire

maintenance

practices.

a.

b.

c.

Do

not

make

temporary

repairs.

Replace

defective

material.

Terminal

box

connections

must

be

tight.

Wire

insulation

should

be

brought

up

to

the

terminal

lug

to

prevent

shorts

with

an

adjacent

wire.

Label

terminal

box

strips

to

identify

the

circuit

contained

therein.

Note

changes

so

others

can

find

the

trouble.

7

TCI Library www.telephonecollectors.info

d.

Splices

should

be

made

and

taped

carefully.

Poorly

made

splices

cause

trouble.

A

void

splicing

building

wires

placed

in

conduit

runs.

e.

Spare

pairs

should

be

included

in

conduit

runs

to

facilitate

additions

or

replace-

ments

in

the

existing

system.

f.

Protect

the

exposed

sections

against

dam-

age,

especially

at

the

instrument

terminal

block.

g.

Leave

enough

slack

at

each

end

of

a

twisted

wire

pair

to

eliminate

the

need

for

splicing

when

the

telephone

is

re-

located.

4.2.4

Telephone

maintenance.

Telephones

receive

hard

use

and

should

be

checked

once

a

year.

When

possible,

replace

the

regular

telephone

with

a

spare

telephone,

clean

the

entire

unit,

and

replace

defective

parts.

Replacing

telephones

for

a

bench

check

is

good

preventive

maintenance.

a.

The

dial.

Faulty

dials

cause

two

com-

plaints:

one

from

the

party

using

it

and

one

from

the

party

wrongly

signaled.

Dials

must

operate

properly

at

all

times.

Although

they

give

no

trouble

from

normal

usage,

they

can

become

dry

and

"sticky,"

reqmrmg

cleaning,

oiling,

and

minor

adjustments.

Dial

maintenance

proce-

dures

are

outlined

below.

Consult

techni-

cal

bulletin

52

7

or

standard

adjustment

sheet

805

for

further

information.

8

(

1)

Remove

the

dial

from

the

telephone.

Remove

the

escutcheon

ring,

finger

plate,

and

number

plate.

(2)

Clean

the

spring

contacts

with

fast-

drying

liquid,

such

as

chlorothene.

(3)

Remove

the

accumulated

lint

from

the

gear

teeth.

(4)

Oil

the

parts

as

suggested

in

technical

bulletin

527

or

standard

adjustment

sheet

805,

using

the

oil

supplied

with

installation.

A

sluggish

governor

should

be

disassem-

bled

and

its

bearings

oiled.

It

is

not

recommended

that

this

be

done

in

the

field.

If

necessary,

be

sure

the

governor-bearing

screw

is

adjusted

and

locked

in

a

position

that

eliminates

excessive

end

play

without

bind.

(5)

Reassemble

and

test.

Adjust

the

governor

to

obtain

the

correct

speed

of

10

pulses

per

second.

In

other

words,

the

dial

should

restore

in

approximately

one

sec-

ond

if

the

number

"O"

has

been

dialed.

A

corrected

dial

may

be

used

as

a

comparison.

(6)

Clean

and

adjust

the

shunt

and

pulse

springs

(see

figure

3).

To

clean,

use

the

contact

cleaner

H-882553-1,

and

to

adjust

use

the

dial

pliers

H-16290-7.

Shunt

springs

are

closed

while

the

dial

is

off

normal.

The

cam

does

not

open

the

pulse

springs

until

its

final

half

revolution.

b.

The

ringer.

Check

for

loose

parts.

Adjust

the

gongs

to

improve

tone.

See

that

the

bias

spring

is

in

place.

Check

for

loose

or

shorted

connections.

c.

The

hookswitch.

Clean

and

oil

for

smooth

operation.

Clean

the

spring

contacts

with

cleaner

H-882553-1.

A

"sticky"

hook-

switch

delays

answering

and

initiating

calls.

Poor

contact

pressure

causes

noisy

conversation.

Check

and

adjust

the

springs

during

routine

inspections.

NOTE:

The

springs

marked

"X"

on

the

wiring

diagram

(figure

3)

should

be

adjusted

to

open

first

and

close

last

to

prevent

clicks

in

the

receiver

when

the

hooks

witch

is

operated.

Replace

other

telephone

components

if

defective.

5.

STATION

SUBSCRIBER

COMPLAINTS

5 .1

Classes

of

Complaints

Classification

of

station

subscriber

complaints

is

the

first

step

in

correcting

trouble.

Com-

plaints

can

be

divided

into

four

groups.

5.1.1

Class

1

complaints.

a.

b.

Description:

Those

reported

by

or

affect-

ing

only

one

station.

Example:

Station

6

in

figure

6.

Cannot

receive

calls;

cannot

initiate

calls;

gets

wrong

number,

etc.

c.

Analysis:

The

fault

is

within

that

position

of

the

system

set

aside

for

the

exclusive

use

of

station

6.

No

portion

that

is

set

aside

for

other

stations

or

commonly

used

by

all

stations

need

be

considered.

5

.1.2

Class

2

complaints.

a.

b.

c.

Description:

Those

reported

by

or

affect-

ing

all

stations

within

a

particular

area

of

the

organization's

plant.

Example:

Stations

7,

8,

and

9

of

figure

6.

Noisy

conversations

and

cannot

seize

the

P-A-X

equipment.

Analysis:

The

fault

is

within

that

portion

of

the

system

used

by

only

these

three

TCI Library www.telephonecollectors.info

TO

STA.I

TO

STA.2

STA.6

TO

STA.

7

TO

STA.B

STA.9

CA.PR

I

CA.PR

I

HOUSE

CABLE

STA.10

Figure

6. Sclie111atic

diagram

u} a

key

lelejJ/ume

s1·s/1·n1.

TELE

NO

__

1_1

~STA.I

MOF

OR

TERMINAL

BOX

9

TCI Library www.telephonecollectors.info

stations.

No

portion

that

is

used

by

other

stations

or

commonly

used

by

all

stations

need

be

considered.

5

.1.3

Class

3

complaints.

a.

Description:

Those

reported

by

and

affecting

all

stations

part

of

the

time.

b.

Example:

All

10

stations

of

figure

6

report

that

at

times

the

called

party

cannot

be

signaled;

at

times

no

dial

tone

is

received,

at

times

no

busy

tone

is

received.

c.

Analysis:

The

fault

lies

within

that

portion

of

the

system

that

is

used

by

all

stations.

However,

since

the

trouble

is

not

present

all

of

the

time,

it

is

probably

caused

by

equipment

used

only

part

of

the

time.

5

.1.4

Class

4

complaints.

a.

b.

c.

Description:

affecting

all

Those

reported

by

and

stations

all

of

the

time.

Example:

All

10

stations

of

figure

6.

No

dial

tone

is

received;

no

station

bells

can

be

rung,

no

busy

tone

received.

Analysis:

The

fault

is

within

that

portion

of

the

system

used

by

all

stations;

it

is

caused

by

equipment

used

at

all

times.

5

.2

Class

1

Complaints

This

type

of

complaint

is

caused

by

trouble

that

is

located

within

any

one

of

the

three

dial

systems'

components.

According

to

section

5.1.1,

this

could

be

the

complaining

party's

telephone,

his

pair

of

building

wiring,

or

his

line

relay

equipment

in

the

switchboard.

Testing

procedure:

The

instrument's

terminal

block

and

all

building

and

main

terminal

boxes

are

used

as

test

points.

Here,

the

system's

components

and

sections

of

the

''C''

component

may

be

separated

and

individually

tested.

Step

1.

Separate

the

complaining

party's

indi-

vidual

P-A-X

equipment

(line

relay)

from

his

other

individual

equipment

at

the

main

terminal

box

or

test

point

1

(see

figure

6).

Connect

a

spare

telephone

and

initiate

and

receive

calls

from

this

point.

Satisfactory

results

eliminate

this

unit

as

the

source

of

trouble.

Reconnect

the

original

circuit,

or

correct

line

relay

faults.

Step

2.

Disconnect

the

complaining

party's

telephone

at

the

instrument

terminal

block

or

test

point

4.

Connect

a

spare

telephone

and

initiate

and

receive

10

calls

from

this

point.

Since

sa

tisfac

-

tory

results

eliminate

the

building

wires

as

the

source

of

trouble,

the

telephone

itself

must

be

at

fault.

Correct

the

fault

in

the

instrument

and

reconnect

the

original

circuit.

Step

3.

When

the

above

mentioned

tests

fail,

proceed

as

follows:

Disconnect

the

complaining

party's

building

w1rmg

lead

at

test

point

2.

Repeat

step

1

(above)

looking

toward

the

P-A-X

from

this

point.

Satisfactory

results

eliminate

this

portion

of

the

building

wiring

lead

as

the

source

of

trouble.

Unsatisfactory

results

require

the

repair

of

this

portion

of

the

building

lead.

Reconnect

the

original

circuit.

If

necessary,

repeat

(step

3)

above

at

test

point

3

and/or

other

test

points

until

the

defective

portion

of

the

building

wirmg

has

been

isolated.

Repair,

test,

and

reconnect

the

orig-

inal

circuit.

5

.3

Class

2

Complaints

This

type

of

complaint

is

caused

by

a

defect

in

that

portion

of

the

complete

system

that

is

used

by

the

complaining

stations

only.

According

to

section

5

.1.2,

the

defect

is

within

that

isolated

length

of

home

cable

serving

these

stations.

Testing

procedures:

Connections

at

terminal

box

D

and

the

main

terminal

box

are

used

as

test

points.

Here,

this

piece

of

equipment

may

be

se

pa.rated

from

the

rest

of

the

system's

equipment

(see

figure

6).

Step

1.

Disconnect

one

end

of

this

cable

from

the

switchboard

at

the

main

terminal

box.

Disconnect

the

other

end

of

this

cable

from

the

telephones

at

terminal

box

D.

Step

2.

Te

st

the

line

and

the

pairs

ohmmeter.

wires

for

grounds,

for

shorts

with

an

Step

3.

Clear

grounds

and/or

shorts

in

the

house

cable.

5

.4

Class

3

Complaints

This

type

of

complaint

is

caused

by

a

fault

in

the

equipment

that

is

used

by

all

stations

only

part

of

the

time.

Accordingly,

this

could

be

a

faulty

P-A-X

conversation

link.

Testing

procedure:

Each

conversation

link

must

be

given

an

operating

test.

Step

1.

Connect

a

spare

telephone

to

the

line

equipment

at

the

main

terminal

box.

TCI Library www.telephonecollectors.info

When

available,

use

spare

line

equip-

ment

as

represented

by

station

11

of

figure

6.

Step

2.

Test

the

conversation

links

until

the

faulty

one

is

located.

Its

operation

under

test

indicates

the

cause

of

the

complaint.

Step

3.

"Busy

out"

the

conversationlinkuntil

the

defect

is

corrected.

5

.5

Class

4

Complaints

This

type

of

complaint

is

caused

by

a

defect

in

some

portion

of

the

complete

system

that

is

used

by

all

stations

for

every

call.

Accord-

ing

to

section

5

.1.4,

this

is

the

P-A-X

common

equipment.

Testing

procedure:

Common

equipment

con-

sists

of

the

link

distribution

and

all

power

and

supervisory

relays

for

supplying

the

tones

and

ringing

current

to

the

conversation

links.

Step

1.

Check

for

low

voltage

supply

to

the

P-A-X

and

for

blown

fuses.

Step

2.

Connect

a

spare

telephone

to

the

line

equipment

at

the

main

terminal

box.

If

possible,

reserve

the

line

equip-

ment,

such

as

station

11

of

figure

6,

for

testing

purposes.

Step

3.

Set

up

calls

while

observing

the

operation

of

various

units

of

the

common

equipment.

Repeat

as

often

as

necessary

until

the

faulty

portion

is

located.

Step

4.

Correct

the

difficulty.

5

.6

Investigation

of

Complaints

and

Correction

Three

steps

in

correcting

a

station

subscrib-

er's

complaint

are:

a.

Classify

the

complaint.

b.

Locate

the

fault

in

the

system.

c.

Correct

the

fault.

Use

sections

5.1

through5.5asguidesforsteps

a

and

b.

The

balance

of

this

bulletin

is

devoted

to

step

c.

Refer

to

the

complete

schematic

of

your

exchange

when

investigating

station

subscriber

complaints.

5

.6.1

The

plunger

lineswitch.

To

investigate

a

station

subscriber's

com-

plaint,

test

the

lineswitch

operation

when

checking

Class

1

complaints

(review

sections

5

.1

through

5

.5).

Should

a

line

switch

need

attention,

check

one

of

the

following:

a.

b.

The

station

subscriber

complains

that

he

can

receive,

but

cannot

initiate

calls.

Proceed

as

follows:

(1)

Test

the

station's

line

switch

by

placing

the

plug

of

the

hand

test

telephone

between

relay

B

springs

3-5.

(2)

If

relay

A

does

not

operate,

check

the

operating

circuit

of

relay

A

with

the

use

of

the

test

lamp

(see

section

6

.3).

(3)

If

relay

B

does

not

operate,

check

the

operating

circuit

of

relay

B

with

the

use

of

the

test

lamp

(see

section

6

.3).

(4)

Clean

the

contacts

with

contact

cleaner

as

explained

in

section

4.2

.2f

or

adjust

the

springs

per

section

8.2

as

required.

The

station

subscriber

complains

that

he

can

initiate,

but

cannot

receive

calls.

Proceed

as

follows:

(1)

Test

the

operation

of

the

line

switch

by

placing

(+)

battery

on

the

connector

bank

lead

C,

with

the

use

of

a

ground

cord,

to

cause

the

small

or

BCO

bridge

cut-off

armature

of

relay

B

of

the

associated

lineswitch

to

operate.

(This

is

how

the

lineswitch

operates

when

its

station

is

called.)

(2)

If

relay

B

does

not

operate

through

its

12QQ.!ohm

winding,

check

it

for

an

open

operating

circuit

with

the

use

of

a

test

lamp

connected

to(-)

battery.

(3)

Clean

the

contacts

with

contact

cleaner

or

adjust

springs

as

required.

5

.6

.2

The

line

relay.

To

investigate

a

station

subscriber's

com-

plaint,

test

the

line

relay

operation

when

checking

Class

1

complaints

(review

sections

5

.1.1

and

5

.2).

Should

a

line

relay

need

attention,

check

one

of

the

following:

a.

The

station

subscriber

complains

that

he

can

receive,

but

cannot

initiate

calls.

Proceed

as

follows:

(1)

Place

the

plug

of

the

hand

test

tele-

phone

between

line

relay

L

springs

5-7.

(2)

If

the

line

relay

does

not

operate,

check

its

operating

circuit

with

the

use

of

a

test

lamp

connected

to

(-)

battery,

and

proceed

contact

by

contact

until

the

trouble

point

is

located

(section

6

.3).

11

TCI Library www.telephonecollectors.info

b.

c.

(3)

Clean

contacts,

or

adjust

springs

as

required

(sections

4.2.2f

and

8.2).

The

station

subscriber

complains

that

he

can

receive,

but

not

initiate

calls.

Proceed

as

follows:

(1)

Test

the

line

relay

by

placing

the

plug

of

the

hand

test

telephone

between

springs

5-7.

(2)

Note

that

the

line

relay

closes

its

"X"

contacts,

but

the

group

relay

equipment

fails

to

start.

(3)

With

the

use

of

the

testlampconnected

to

(-)

battery,

check

the

start

c

ire

ui

t

of

the

group

relay

equipment

(section

6

.3).

(4)

Clean

contacts,

or

adjust

springs

as

required

(sections

4

.2

.2f

and

8

.2).

The

station

subscriber

complains

that

he

can

initiate,

but

cannot

receive

calls.

Proceed

as

follows:

(1)

Place(+)

batteryontheconnectorbank

lead

C

with

a

ground

cord

to

operate

its

associated

line

relay.

(2)

If

the

line

relay

does

not

operate,

check

for

an

open

lead.

(3)

With

the

ground

cord

at

one

end

of

the

lead,

place

the

test

lamp

connected

to

(-)

battery

at

the

other

end.

If

the

lamp

does

not

glow,

the

lead

is

open.

(4)

Replace

the

open

lead.

5.6.3

The

master

switch.

To

investigate

a

station

subscriber's

com-

plaint,

test

the

operation

of

this

switch

when

checking

Class

4

complaints

involving

the

distribution

of

connector

switch

trunks

(review

sections

5.1.4

and

5.5).

Should

a

master

switch

need

attention,

check

one

of

the

following:

a.

The

station

subscriber

complains

that

he

hears

interference

from

other

stations

during

call.

Proceed

as

follows:

12

(1)

Place

the

plug

of

the

hand

test

tele-

phone

between

relay

B

springs

3-5

of

an

unused

lineswitch

and

release

it

several

times.

(2)

Assume

that

the

master

switch

does

not

operate.

The

lineswitch

remains

opposite

trunk

No.

1.

(3)

With

the

aid

of

a

test

lamp,

check

the

opera

ting

circuit

of

the

solenoid;

also

check

if

the

trip

relay

has

operated.

b.

(4)

Clean

the

contacts

or

adjust

the

springs

as

required

(sections

4.2

.2f

and

8

.2).

The

station

subscriber

complains

that

there

is

an

intermittent

all-trunks-busy

condition

on

the

P-A-X.

Proceed

as

follows:

(

1)

Place

the

plug

of

the

hand

test

tele-

phone

between

relay

B

springs

3-5

of

an

unused

lineswitch

and

release

it

several

times.

(2)

Assume

that

the

master

switch

skips

idle

trunks.

(3)

Check

the

release

timing

of

the

start

relay

or

locking

magnet.

(4)

Adjust

the

residual

screw

(section

8

.3).

5

.6

.4

The

distributor

equipment.

To

investigate

a

station

subscriber's

com-

plaint,

test

the

operation

of

this

equipment

when

checking

Class

4

complaints

involving

conversation

link

seizure

and

selection

(review

sections

5

.1.4

and

5

.5).

Should

this

equipment

need

attention,

refer

to

one

of

the

following:

a.

The

P-A-X

is

out

of

service.

No

station

can

initiate

calls.

Proceed

as

follows:

b.

(1)

Short

the

test

jacks

1-2

of

the

group

relays.

This

equipment

should

operate

to

select

and

operate

the

linefinders

in

sequence

until

the

short

is

removed.

(2)

Assume

that

this

equipment

operates,

but

the

line

finder

is

not

seized.

(3)

Check

for

an

open

start

circuit

in

the

linefinder

with

the

aid

of

a

test

lamp

con-

nected

to(-)

battery

(section

6.3).

(4)

Clean

the

contacts

or

adjust

the

springs

as

required

(sections

4.2.2f

and

8

.2).

The

P

-A-X

is

out

of

service.

No

station

can

initiate

calls.

(1)

Place

the

hand

test

telephone

into

test

jacks

3-4

of

the

group

relays.

This

equip-

ment

will

seize

a

preselected

linefinder-

connector

link,

or

a

linefinder-selector

link,

depending

on

the

system

your

P-A-X

uses.

(2)

If

relay

B

in

the

linefinder

operates,

but

it

does

not

step

vertical,

check

for

an

open

VERT

(vertical)

circuit

or

an

open

INT

(interrupter)

circuit

in

this

equipment.

TCI Library www.telephonecollectors.info

(3)

Checking

for

an

open

vertical

and

interrupter

circuit

may

be

done

by

the

use

of

a

test

lamp

or

ground

cord

(sections

6.3

and

6.4).

(4)

Clean

the

contacts

or

adjust

the

springs

as

required

(sections

4.2

.2f

and

8

.2).

5

.6

.5

The

line

finder

switch.

To

investigate

a

station

subscriber's

com-

plaints,

test

the

operation

of

the

linefinders

when

checking

Class

3

complaints

involving

conversation

link

seizure

and

operation

(review

sections

5

.1.3

and

5

.4).

Before

working

on

a

faulty

linefinder,

it

should

be

busied

out.

To

busy

out

a

line

finder,

operate

the

red

lever

of

the

busy

key.

Should

a

linefinder

need

attention,

refer

to

one

of

the

following:

a.

The

station

subscriber

complains

that

at

times

he

waits

for

dial

tone.

Test

all

linefinders

by

placing

the

plug

of

the

hand

test

telephone

between

test

jacks

3-4

of

the

group

relay

equipment.

This

equipment

will

then

seize

a

preselected

linefinder-

connector

link

or

linefinder-selector

link.

Dial

tone

is

heard

and

calls

may

be

made.

By

releasing

and

re

seizing

this

equipment

several

times,

all

linefinders

may

be

tested.

Proceed

as

follows:

b.

(1)

While

testing

the

linefinders,

it

is

noted

that

one

switch

does

not

find

the

proper

level.

(2)

Possible

cause:

An

open

test

circuit

to

the

vertical

bank

and

wiper.

(3)

Clean

and

oil

vertical

banks

and

wiper.

Adjust

wiper.

(4)

While

testing

the

linefinder,

it

is

noted

that

one

switch

does

not

find

the

proper

rotary

level

contact.

(5)

Clean

and

oil

the

bank

contacts

and

wiper.

Adjust

the

wiper.

The

station

subscriber

complains

that

at

times

he

waits

for

dial

tone.

Test

linefinders

as

in

section

5.6.5a

above.

Proceed

as

follows:

(1)

While

testing

the

linefinders,

note

that

one

switch

may

fail

to

step

vertical.

(2)

Check

for

an

open

vertical

circuit

with

the

use

of

a

test

lamp

or

ground

cord

(sections

6.3

and

6.4).

(3)

Clean

the

contacts

and

adjust

the

springs

as

required

(sections

4.2

.2f

and

8

.2).

c.

The

station

subscriber

complains

that

at

times

he

waits

for

dial

tone.

Test

line-

finders

as

in

section

5 .6

.5a

above.

Proceed

as

follows:

(1)

When

testing

linefinders,

it

is

noted

that

one

switch

finds

the

line

but

drops

its

connection;

i.e.,

it

does

not

hold

an

established

connection

between

the

line

relay

and

the

switch.

(2)

Possible

cause:

An

open

locking

circuit

for

the

switch-through

relay

of

the

line

finder.

(3)

Test

the

open

circuit

with

the

use

ofa

test

lamp

or

ground

cord

(sections

6.3

and

6.4).

(4)

Clean

the

contacts

and

adjust

the

springs

as

required

(sections

4.2

.2f

and

8

.2).

5

.6.6

The

selector.

To

investigate

a

station

subscriber's

com-

plaints,

test

the

operation

of

this

switch

when

checking

Class

3

complaints

involving

the

seizure

of

conversation

links,

dial

tone,

or

dialing

of

the

first

digit

of

a

station

number

(sections

5.1.3

and

5.4).

The

linefinder

and

selector

are

considered

one

unit,

since

each

is

wired

to

the

other

and

a

fault

in

one

affects

the

operation

of

the

other.

a.

b.

To

test

the

operation

of

a

selector,

place

the

plug

of

the

hand

test

telephone

between

test

jacks

1-2;

the

switch

operates.

When

working

on

a

faulty

selector,

operate

the

busy

key

to

busy

out

the

selector.

A

linefinder-selector

link

must

also

be

busied

out

at

the

linefinder.

Busying

out

only

the

selector

will

lock

the

linefinder

and

the

first

line

relay

to

seize

it,

causing

a

Class

1

complaint.

The

station

subscriber

complains

that

at

times

he

waits

for

dial

tone.

(1)

Test

all

the

linefinder-selector

links

per

sections

5

.6

.5a

and

5 .6

.6a

above.

(2)

Indication

of

trouble:

A

particular

line

finder

finds

and

seizes

the

line,

but

immediately

drops

its

associated

selector.

A

second

linefinder

is

seized

and

dial

tone

is

heard.

(3)

Look

for

a

fault

in

the

line

finder.

Assume

that

not

the

linefinder

but

the

selector

is

at

fault.

(4)

Test

the

faulty

selector

per

section

5

.6

.6a

above.

13

TCI Library www.telephonecollectors.info

(5)

Assume

that

the

cause

is

an

open

operating

circuit

of

relay

B.

(6)

Test

the

operating

circuit

of

relay

B

with

the

test

lamp

or

the

ground

cord

(sections

6

.3

and

6

.4).

(7)

Clean

the

contacts

and

adjust

the

springs

as

required

(sections

4.2.2f

and

8

.2).

c.

The

station

subscriber

complains

that

at

times

no

dial

tone

is

received,

but

station

number

can

be

dialed.

Proceed

as

follows:

(1)

Test

selectors

per

section

5.6.6a

above

to

locate

the

faulty

selector

not

supplying

dial

tone.

(2)

When

the

faulty

selector

is

seized,

no

dial

tone

is

heard.

Check

the

tone

start

circuit.

If

the

tone

circuit

has

started,

then

check

the

dial

tone

circuit

to

the

(+)

line.

(3)

Test

the

tone

start

circuit

with

the

use

of

a

test

lamp.

The

dial

tone

circuit

is

tested

with

the

use

of

a

receiver

with

a

series

capacitor

(sections

6.3

and

6.5).

(4)

Clean

the

contacts

per

section

4.2

.2f.

Adjust

the

springs

per

section

8

.2.

d.

The

station

subscriber

complains

that

at

times

the

dial

tone

is

heard

after

the

first

digit

is

dialed;

the

dialing

cannot

be

com-

pleted.

Proceed

as

follows:

(1)

Test

all

selectors

per

section

5

.6

.6a

above

to

locate

the

one

not

responding

to

dial

pulses.

(2)

The

faulty

selector

will

not

step

its

shaft

vertical.

Test

the

operating

circuit

of

the

vertical

magnet

with

the

use

of

a

test

lamp

or

a

ground

cord

(sections

6.3

and

6.4).

(3)

Clean

the

contacts

and

adjust

the

springs

as

required

(sections

4.2

.2f

and

8

.2).

e.

The

station

subscriber

complains

that

at

times,

although

dial

tone

is

removed

from

the

line

after

the

first

digit

is

dialed,

the

call

cannot

be

completed.

Proceed

as

follows:

14

(1)

Test

all

selectors

per

section

5.6.6a

above

to

locate

the

faulty

switch.

(2)

The

wipers

of

the

faulty

switch

will

not

rotate

to

the

first

bank

contacts

after

dialing

is

completed.

f.

g.

(3)

Test

for

an

open

operating

circuit

of

the

rotary

magnets

with

the

use

of

a

test

lamp

or

ground

cord

(sections

6

.3

and

6

.4).

(4)

Clean

contacts,

or

adjust

springs

as

required

(sections

4.2

.2f

and

8

.2).

The

station

subscriber

complains

that

at

times

the

dial

tone

returns

after

the

first

digit

is

dialed.

Proceed

as

follows:

(1)

Test

all

selectors

per

section

5.6.6a

above

by

dialing

an

unused

level.

(2)

The

faulty

switch

rotates

its

wipers

to

the

11th

position

and

releases.

On

re-

seizure,

dial

tone

is

heard.

(3)

Test

for

an

open

circuit

in

the

busy

tone

and

ground

circuit

with

the

use

of

a

test

lamp

or

a

receiver

with

a

series

capacitor

(sections

6

.3

and

6

.5).

(4)

Clean

the

contacts

per

section

4.2

.2f;

adjust

the

springs

per

section

8

.2.

The

station

subscriber

complains

that

at

times

ringing

starts

after

the

second

digit

is

dialed

and

the

wrong

party

is

signaled.

Proceed

as

follows:

(1)

Check

all

selectors

to

find

which

has

failed

to

release

after

a

call.

(2)

The

faulty

selector

will

have

its

wipers

resting

on

bank

contacts

and"all

relays

will

be

released.

(3)

Check

for

an

open

operating

circuit

of

the

release

magnet

with

the

aid

of

the

test

lamp

(section

6

.3).

(4)

Clean

the

contacts

or

adjust

the

springs

as

required

(sections

4.2

.2f

and

8

.2).

5

.6.

7

The

connector

(selector

system).

To

investigate

a

station

subscriber's

com-

plaints,

test

the

operation

of

this

switch

when

checking

Class

3

complaints

involving

station

busy

tone,

station

signaling,

transmission,

etc.

(sections

5.1.3

and

5.4).

a.

To

test

the

operation

of

a

connector,

place

the

plug

of

the

hand

test

telephone

between

test

jacks

1-2.

The

connector

is

seized

and

dialing

can

follow.

When

workingona

faulty

connector,

it

should

be

busied

out

first.

To

busy

out

a

connector,

operate

the

red

lever

of

the

busy

key.

If

there

is

no

busy

key

on

the

connector,

short

test

jacks

3

and

4.

Red

busy

clips

are

supplied

with

the

installation.

Should

a

connector

need

attention,

check

one

of

the

following:

TCI Library www.telephonecollectors.info

b.

The

station

subscriber

complains

that

at

times

the

called

party

in

a

particular

hundreds

group

cannot

be

reached.

Pro-

ceed

as

follows:

(1)

Test

all

connectors

in

that

particular

group

per

section

5

.6.

7a

above

for,a

switch

not

responding

to

dial

pulses.

(2)

Note

that

a

connector

does

not

raise

its

switch

shaft

in

response

to

the

first

series

of

dial

pulses.

(3)

Check

for

an

open

operating

circuit

of

the

vertical

magnets

with

the

aid

of

test

lamp

(section

6.3).

(4)

Clean

contacts,

or

adjust

springs

as

required

(sections

4.2.2fand

8.2).

c.

The

station

subscriber

complains

that

at

times

the

called

party

in

a

particular

hundreds

group

cannot

be

reached.

Pro-

ceed

as

follows:

(1)

Test

all

connectors

in

that

particular

group

per

section

5

.6.

7a

above

for

a

switch

not

responding

to

dial

pulses.

(2)

Note

that

a

connector

does

not

rotate

its

wipers

across

the

bank

contacts

in

response

to

the

second

series

of

dial

pulses.

(3)

Check

for

an

open

operating

circuit

of

the

rotary

magnets

with

the

aid

of

the

test

lamp

(section

6.3).

(4)

Clean

contacts,

or

adjust

springs

as

required

(sections

4 .2

.2f

and

8

.2).

d.

The

station

subscriber

complains

that

at

times

no

busy

tone

is

heard

when

a

busy

line

of

a

particular

hundreds

group

is

dialed.

Proceed

as

follows:

(1)

Test

all

connectors

in

that

particular

group

by

dialing

a

busy

line

per

section

5.6.7a

above.

(2)

Note

that

no

busy

tone

is

heard

after

dialing

a

busy

line

number

on

the

faulty

connector.

(3)

Check

for

an

open

busy

tone

circuit

with

the

aid

of

a

receiver

with

a

series

capacitor.

(4)

Clean

contacts,

or

adjust

springs

as

required

(sections

4.2.2f

and

8.2).

e.

The

station

subscriber

complains

that

at

times

the

called

party

of

a

particular

hundreds

group

cannot

be

signaled.

Pro-

ceed

as

follows:

f.

(1)

Test

all

connectors

in

that

particular

group

per

section

5

.6.

7a

above

by

dialing

any

station

number

in

the

group

to

locate

the

switch

not

supplying

"Int.

Gen."

to

the

bells

of

the

called

party.

(2)

Note

that

when

a

station

number

is

dialed

on

a

faulty

connector,

the

called

party

does

not

answer.

(3)

Check

for

an

open

ringing

circuit

with

the

aid

ofa

receiver

with

a

series

capacitor

(section

6

.5).

(4)

Clean

contacts,

or

adjust

springs

as

required

(sections

4.2.2f

and

8.2).

The

station

subscriber

complains

that

at

times

the

called

party

of

a

particular

hundreds

group

cannot

be

heard.

Proceed

as

follows:

(1)

Test

all

connectors

in

that

particular

group

per

section

5

.6.

7a

by

dialing

any

station

number

in

that

group

until

the

faulty

connector

is

located.

(2)

To

test

the

transmission

trouble

of

the

faulty

connector,

connect

a

telephone

equipped

with

a

ringer

to

a

dead

level

at

the

connector

bank

block.

Connect

the

test

lamp

to(-)

battery.

(3)

With

the

hand

test

telephone

plugged

into

test

jacks

1-2

of

the

faulty

connector,

dial

the

connector

to

the

dead

level.

When

the

dead

level

is

reached,

touch

the

control

wiper

terminal

with

the

test

lamp

momentarily.

(This

allows

the

wiper

closing

relay

to

operate

and

start

the

ring-

ing

circuit.)

(4)

Lift

the

handset

of

the

telephone

connected

at

the

dead

level;

while

talking

in

one

telephone,

listen

in

the

other.

(5)

Check

all

the

spring

contacts

of

the

transmission

circuit.

(6)

After

satisfactory

tests

have

been

made

on

all

spring

contacts,

check

trans-

mission

capacitors.

Temporarily,

bridge

new

capacitors

in

multiple

with

switch

capacitors.

If

the

transmission

trouble

is

cleared,

r.eplace

with

new

capacitors.

5.6

.8

The

connector

(connector

system).

To

investigate

a

station

subscriber's

com-

plaints,

test

the

operation

of

the

connectors

when

checking

Class

3

complaints

(sections

5

.1.3

and

5

.4).

a.

To

test

the

operation

of

a

connector,

place

the

plug

of

the

hand

test

telephone

between

15

TCI Library www.telephonecollectors.info

test

jacks

1-2;

the

connector

is

seized

and

dialing

can

follow.

When

working

on

a

faulty

connector,

busy

out

the

connector

by

shorting

test

jacks

3-4

with

red

busy

clips

supplied

with

the

installation.

A

line-

finder-connector

link

must

also

be

busied

out

at

the

line

finder.

Busying

out

only

the

connector

will

lock

the

linefinder

and

the

first

line

relay

to

seize

it,

resulting

in

a

Class

1

complaint.

b.

The

station

subscriber

complains

that

at

times

dial

tone

is

not

heard,

but

dialing

is

possible.

Proceed

as

follows:

(1)

Test

all

connectors

per

section

5

.6

.Ba

to

locate

the

switch

not

supplying

dial

tone.

(2)

Note

that

when

the

faulty

connector

is

seized,

no

dial

tone

is

heard.

(3)

Check

for

an

open

dial

tone

circuit

with

the

use

of

a

receiver

with

a

series

capacitor

(section

6

.5).

(4)

Clean

the

contacts

or

adjust

the

springs

as

required

(sections

4.2.2f

and

8

.2).

(5)

If

defective

capacitor

is

at

fault,

replace

with

a

new

capacitor.

c.

The

station

subscriber

complains

that

at

times

he

cannot

reach

the

called

party

although

the

dial

tone

is

removed

from

the

line

after

the

first

digit

is

dialed.

Proceed

as

follows:

d.

16

(1)

Test

all

connectors

per

section5.6.8a

to

locate

the

connector

not

dialing

the

complete

station

number.

(2)

Note

that

the

faulty

connector

will

not

step

its

wiper

across

the

bank

contacts.

(3)

Check

for

anopenoperatingcircuitfor

the

rotary

mag~ets

with

the

aid

of

the

test

lamp

(section

6.3).

(4)

Clean

the

contacts

or

adjust

the

springs

as

required

(sections

4.2.2f

and

8

.2).

The

station

subscriber

complains

that

at

times

he

does

not

hear

a

busy

tone.

Proceed

as

follows:

(

1)

Test

all

connectors

per

section

5

.6

.Ba

by

dialing

a

busy

level

to

find

the

connector

not

supplying

busy

tone.

(2)

Check

for

an

open

busy

tone

circuit

with

the

use

of

a

receiver

with

a

series

capacitor

(section

6.5).

(3)

Clean

the

contacts

or

adjust

the

springs

as

required

(sections

4.2

.2f

and

8

.2).

e.

The

station

subscriber

complains

that

at

times

the

called

party

cannot

be

signaled.

Proceed

as

follows:

f.

(1)

Test

all

connectors

per

section5.6.8a

by

dialing

any

station

number

to

locate

the

switch

not

supplying

ringing

current.

(2)

Note

that

when

a

station

number

is

dialed

on

a

faulty

connector,

the

called

party

does

not

answer.

(3)

Check

for

an

open

ringing

circuit

with

the

aid

of

a

receiver

with

a

series

capacitor

(section

6.5).

(4)

Clean

contacts,

or

adjust

springs

as

required

(sections

4 .2

.2f

and

8

.2).

The

station

subscriber

complains

that

he

receives

a

number

of

calls

intended

for

other

stations.

Proceed

as

follows:

(1)

Check

all

connectors

to

find

the

switch

not

released.

(2)

Note

that

the

wipers

of

the

faulty

connector

will

rest

on

the

complaining

party's

connector

bank

terminals,

but

all

relays

will

be

released.

(3)

Check

for

an

open

operating

circuit

of

the

release

magnet

with

the

use

of

the

test

lamp

(section

6.3).

(4)

Clean

contacts,

or

adjust

springs

as

required

(sections

4.2

.2f

and

8

.2).

g.

The

station

subscriber

complains

that

at

times

the

Code

Call

equipment

cannot

be

seized.

Proceed

as

follows:

(1)

Test

all

connectors

per

section5.6.8a

above

by

dialing

the

Code

Call

number,

usually

70.

(2)

Note

that

when

the

faulty

connector

is

dialed,

the

Code

Call

equipment

is

not

seized.

(3)

Check

for

an

open

circuit

in

the

cam

springs.

(4)

Clean

the

contacts

per

section

4.2.2f

or

adjust

the

camspringspersection8.10.

5

.6

.9

Tone,

charge

alarm

and

charge

control

relays.

To

investigate

a

station

subscriber's

com-

plaints,

test

equipment

operation

when

checking

TCI Library www.telephonecollectors.info

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