General Telephone & Electronics Automatic Electric P-A-X User manual

\1

I I

r r

.,

-·

I,

'

.I

I '

I'·

/

/'

.\

·I

j

I,

,\'

'I

)',

,,

I

I)~-

,~

'I

\

t

b '

'I

I

'~

J

//'

'1

\,

11 f

,/

I

~

1\

"'

\ -

I

'\

I

ri-;

..

) '\· \

\~

1,

(

IJ '

~

1

/

'

1,

) ;

.{

.

,-

I _,

v'

I

11

/

I

•'

\

,.

'11,

'I

\'

1,

I I

-~

;,

;

I

,,

-1'

I

> /

r · 1

\.

I

! ;

'-.

j -

" {

,l

J

,.,

t·'

I '

r

I

\-'

v.\

1 •

I

'/'

x l

I .

I '

y I

" I

I'

l'

.,

/

1/

_)

I

,.

I

1,

J

I

•1

1l

fl

v

,l

\ '

\

,.

\ '

-:,

,.

I I

I/,;

I I

1\

\

,/

I'

/,'

.

'1

I

,,

c~

I

1

i

'·

t·

t'

'i

I\\

I l

1,

.1

' ' . ( I

,I t

~.

r

1,

\(

'

['

"

.'9.

I·,

I j'

Ii

'!

,"

''

\·

I

r \

, I

(

TCI Library www.telephonecollectors.info

J

,J

(•.

:<;,

>

t

; I

'

"'

'

';

j

'(

<

l\.

I.

r

'

rr.

'"(~''

. /

r '

I

\

t'

;,

'-.

('

I

'

"'

. ,

'

'I

-P:.J

r l > ,...,

' I

( ' '

*

/

~

'

/

,\

\

,,..,.

.

:;/

-··

'-1

/ ;./

l

1'

•

!\,/K

(

"v.~._,

./!

~'"

\'

'

. I

"

' '

j

}

,.

'

I~

• "' ~J

'-

\ '' \ f

1 \t\

~

,-r

!.,

,,

t

\'

('

(

I

.(

,..

'

~\

J , Factory,)

deqelopme~

laborptories, and gen-erpl

<!ffice

ar;;:..Norihlake,

~·

f ' \ · , 1 I ,!'_

.l

"·

\ ,,

~

J

'·

t

.•

'"

~

/ ,

_,

AUTqMATIC

ELEC'fRIC

C,

OMPANY

i&

an

J

6r

'

g~1uzation

?f

qesigning,

engineering,

and

1

manu(actur.ing

's

pecialists

in

t

the

field&

of

com

t

muni~ation,

~lectrical

control,

and

allied

arts.

Fp~

mor~

tf1an

sixty

years

tlie

company

,

has

·

bee~

known

~hrouj;hout

~he

wor

,

ld

4s

t.)1~

originator

a.

n<l

parer\.t

··

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

1out:

of

the

~

work

of

Autonl,atic

Electrfc

'engi-

neers

i[t th,e'

fi~lcl

of

tef~phone

e~nU'nuni~ation

are

a's~

·

b~iµg

suc~s~fully

applied

,

pn

~l'l

·

ever-increasing

s~ale-

to

the

so'lutioft

of

el~ctri<;al

co~trQl

;

pn,ib]ems-

in

husiness

<

an~

industr~.

I

/'

,\

/ '

;;:

• I

••

1,,

, I

fo

,/

' -

,,.

\.

~

/

PR~IPAL

~

PRODU(:TS

' . ( '

-·

-·(

,,,

,/

,,

f

\

j·

Strowger

Automattc

Tek!phon,e

Systef1u

-<;:

om·

15-,

~on~

'

ecti<tns,

11nd

with

faeilities

for

speci~l

services

to

meet

ffie

needs

-0£

tbe

user.

1

control

(

'plt:te

allto~natic

cen~rariffi•~e

equipment

'

for

ex· ,

change

uea.1

of

any<

size, froni

small

towns

to

th«;

largest)11etropolitan

ntlWo~ks.

,_

/

I . , '

r .

'·

.

P.B:X.

_

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

ueas,

1

.'

wi

'

th

fa.c1Jities

for

SWit<)iingintO

attended

' I

'

..

' I > I

Tel~phone

_ln~trumflnls

-

,Modern

desig,ns

fo1:.

autornatjc

or

manual

exchanges.,

inclt1ding

the

' I ;.,.

MonophoQ-O-the

world's

most

attractive

.and

em·

excJ:ianges. · ,.- ' ' ' '·

, \ I

dent

handset

1

t~lephone:

'

J'

I

.,;

,

Alutomafi~

~oil

Bo11rds

t':A

n.

adaptatirn

~f

.

Strowger:-'prmclJ.ll~s

,

to

toll

sw1tchmg,

resulting

m

simplififation

of

opera!ors'

eqµjpme~t

and

greater

..,.

1 '

,,

,

Exchange

1Accessor:y

Equip~nent

-A

µJtiliary

,e

x-

change

'.{li1d

&uhsiat(op

equil?,meJ"(•

itH'l~dihi;

\

' \

\.

~

'l

~

>

,,,

; ' l

'I '

1 '

,

j>-

1 .

,..

t'

. I

..

...

/

/ l I

economy

'

qf

opt:rating

a'riJ,

toll-1·ircµi( titn"e. _

-::C_

/

manual

de.sk.s,-test<inig .

app

'

aratus,

tra;isn1iss,ion

·,_

equipnient,

and

all

a.cces~o.iies

ne

.

ed~13or

the

Private

Aut

•oma-ti'<

Ex1;han-ge.s

.1:

Available

in

operation

'

and

111aipte11anee

Qf

the

.

1uodern

teJe.-

v~rious

rapacities,

)V'ith

.

Qr

"'id;'out

central-offi~e

phqn

_e

exchange.

·

..?

. ., ' I

--

/

''

~

l-

1

-

)'

' I

y.

J->i

//'"'

.....,

r-

• . '(

~

Makers

.also

pf,ele<-tri(1al

co..;tro

apparatus

for

industri~,

.

~ineering,

ai•d

'

prblic

-"'

u~i'y

companie5,

telephone

app8,ratus

for

railroads

and

nipe

-

line

rQmpanle.i;,

{1rlvate

telephone

_s:Vstems

of

Ml

~ypes,

'

electric;11,l

anf\

~mmunication

tf~vices

(or

•

~ircra£,t

and

air~a:v(

control,

;

an

,

~

~pecial

coDl(lnunicafion

!!P~aratqs

for

milif~y

I '

~nd

naval

depar'tpient~.

.t

.,...

'

' I f

/

.r

_.,.>

> ,, \

""

\,...

,.,__

\

L '.1>-: '

,

,..

'

'\

•

11

./

·'

I I ' 0 ' k ' \

\ '

I...

I

(

''

/\

t-

...

\ . ' , J

..j

I ' - I ' - I

. I

'

·,.

')

( '

" I

' "

'\

' \

L

~

I

/

./

Copyright

©

1

19

\

6~

1

Automatic

·

Electric

.

pompany

,I

-

j,..

.....

,I

r

~

I J ( "

.,

I'

/'

.•.

: l / /

,.

/.'

)

I·

'

<

,/

;

_.,-

I

' r \

/

I I

~,...

'

...

'

\

.\

I

~

I

}.J·~

'

·,,

'I

i'

\ \

}

, '

j

J I

•

__y

.\

,..;.-'

}

~

J •

1,

' .

I

'l-

'

I

.,

(i

f

\

./

/I

•'

·~

~\

(

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

General Telephone & Electronics Automatic Electric P-A-X User manual

Popular Telephone System manuals by other brands