Ibm 353 User manual

I

TIJ]5rk1r

Machine

Record I

MACH

SERIAL

NUMBER

VOLTAGE

AcD

CYCLES

DATE

TYPE

DcD

INSTALLED

353

354

SYSTEM

DIAGRAMS

PLANT

INSTALLED

SPECIAL

FEATURES

EC

LEVEL

DESCRIPTION

QTY

DESCRIPTION QTY

FIELD

INSTALLED

SPECIAL

FEATURES

CEM

DIAGRAM

INSTALLED

REMOVED

NO.

OR

S/M

NO.

DESCRIPTION

OF

FEATURE

MAN

NO.

DATE

MAN

NO.

DATE

227-5583-1

(11-62)

Issued to:

________________

_

Branch Office:

______________

_

Department:

_______________

_

Address:

________________

_

If

this manual

is

misplaced,

it

should

be

returned to

the

above address.

1710)0

w.r-

t~_!J[~

..

~l.M..!.

Customer Engineering Reference

Manual

til)

353 Disk Storage

354 Disk Control

@ 1962

by

International

Business

Machines

Corporation

TIrls

edition,

Form

227-5583-1,

incorporates

major

changes

and

additions

to

Form

R27-5583-0.

The

latter

form

is

made

obsolete

by

these

changes.

Section

2

of

this

manual

contains

reference

material

that

is

specifically

intended

for

the

353 Disk

Storage

and

the

354

Disk

Control.

Most

of

the

service

checks,

adjust-

ments,

and

removal

and

replacement

procedmes

for

the

353

Disk

Storage

are

the

same

as

those

for

the

1301 Disk

Storage.

The

procedmes

that

are

the

same

are

not

included

here,

but

are

found

in

the

1301

Disk

Stor

age

Customer

Engineering

Reference

Manual

(Form

227-5581).

Address

comments

regarding

this

publication

to:

IBM,

Product

Publications

Department,

San

Jose,

California

227-5583-1

(11-62)

Section

1.

Section

2.

Section

3.

Section

4.

Section

5.

227-5583-1 (11-62)

INSTALLATION INSTRUCTIONS

••••••••••••••••

5

SCHEDULED MAINTENANCE

11tis

section

describes

scheduled

maintenance

objectives

and

procedures.

The

accepted

inspection

routine

is

given

in

detail

• • • • • • • • • • • • • • • • • • • • • • •

••

1.

1

SERVICING PROCEDURES

This

section

includes

adjustments,

removals,

replace-

ments,

waveforms,

levels,

and

performance

tests

of

machine

areas

and

functional

units.

• • • • • • • • • • • •

••

2. 1

SERVICE AIDS

This

section

contains

specific

trouble

symptoms

and

cures,

scope

aids,

lubrication

charts,

and

servicing

hints.

•••••••••••••••••••••••••••••

3. 1

LOCATIONS

This

section

gives

locations

of

all

major

components

and

functional

units.

• • • • • • • • • • • • • • • • • • • •

••

4. 1

SPECIAL TOOLS AND SUPPLIES

This

section

lists

and

describes

the

tools

and

supplies

that

are

specifically

designed

for

this

machine

or

are

necessary

for

proper

servicing

of

this

machine

• • • • • • •

••

5.1

CONTENTS

SAFETY

Personal

safety

cannot

be

overemphasized.

To

ensure

your

own

safety,

make

it

an

every

day

practice

to

follow

safety

precautions

at

all

times.

Become

familiar

with

and

use

the

safety

practices

outlined

in

IBM

pocket-

size

cards,

Forms

124-0002

and

M04-8401,

issued

to

all

Customer

Engineers.

Exercise

caution

when

working

around

moving

parts

of

the

machine.

Parts

of

the

body

or

clothing

near

the

machine

can

cause

accidents

if

the

machine

starts

unexpectedly.

These

accidents

can

be

pre-

vented.

Potential

difference

within

the

power

contactor

gate

is

-48

v

DC

to +208 v AC.

Potential

difference

within

the

electronic

gates,

printed

cards,

anddisplay

back

pa.nel

is

-48

v DC

to

+30 v DC. Do

not

remove

or

repla.ce

circuit

cards

when

DC

power

is

on.

Do

not

short

out

or

bypas

s

any

safety

feature.

One

such

feature

is

the

access

cover

door

safety

switch.

Do

not

allow

the

access

to

run

with

this

door

open

by

manually

energizing

this

cover

safety

switch.

Also

note

that

although

the

actuator

is

electronically

interlocked

with

this

door

open,

if

for

any

reason

the

solenoid

DC

power

goes

off

the

actuator

will

attempt

to

move

under

hydraulic

pressure.

Access

Mechanism

Because

of

the

random

and

sometimes

unpredictable

motion

of

the

access

mechanism,

it

should

be

serviced

with

caution.

Shields

and

guards

have

been

provided

which

can

be

of

assistance

only

when

firmly

in

place.

Care

should

be

taken

to

remove

the

access

assem-

bly

according

to

outlined

procedures.

Two

men

must

be

available

to

handle

this

unit

since

it

weighs

approxi-

mately

60

poundR

and

the

mounting

screws

are

accessible

only

from

the

rear

of

the

supporting

strut.

Power

Supplies

When a

DC

failure

is

sensed,

a

DC

off

sequence

is

initiated

but

power

remains

on

at

the

gate

blowers,

convenience

outlets,

and

disk

drive

motor.

Do

not

depend

on

this

feature

as

safety

protection.

Always

use

fusc

pullers

to

remove

or

insert

fuses.

Replace

plastic

protective

covers

over

fuses

immedi-

ately

after

replacing

fuse.

The

power

supplies

are

heavy

and

should

be

removed

with

care.

Remove

line

cord

from

power

receptacle

and

wait

at

least

15

seconds

after

power

is

turned

off

before

attempting

any

repair

or

adjust-

ment

within

any

power

supply.

High

Voltages

High

voltage

lines

and

connections

exist

in

many

areas

within

the

machine.

Such

voltages

are

found on

trans-

formers,

terminals,

convenience

outlets,

and

the

like.

Contactor

relays

utilize

high

voltages

at

their

points.

Check

these

contactor

relays

with

the

power

on

only

if

absolutely

necessary,

and

use

extreme

caution.

Power

On

States

Before

the

file

is

brought

up

to

running

condition

from

the

power

sequence

panel,

it

may

exist

in

one

of

several

states

of

power

on.

In

all

cases,

the

following

assumptions

are

made:

1.

The

file

is

plugged

into

the

wall.

2.

The

wall

plug

is

at

the

specified

potential.

Mainline

(70

amp

C.

B.)

switch

OFF.

1.

208-230

volts

AC

is

present

at:

a.

input

and

output

of

mainline

filter

b.

input

to

the

mainline

switch

Mainline

switch

and

CB-2

(30

amp

C.

B. ) ON.

1.

208-230

v AC

is

present

at:

a.

input

and

output

of

mainline

filter

b.

input

and

output

of

mainline

switch

c.

input

and

output

of

CB-2

d.

input

to

K-2,

K-3,

K-4

e.

T1

2. 110 v

AC

is

present

at:

a.

convenience

outlet

b.

TB204,

TB203

c.

Tl

3.

24 v

AC

is

present

at:

a.

Tl

b.

TB204

c.

power

sequence

panel

When

working

in

these

areas,

remove

the

input

power

cord

or

turn

off

AC

power

at

customer's

wall

switch.

1.

Remove

packing

material

as

specified

in

un-

packing

instructions.

Do

not

install

drawers.

2.

Inspect

machine

for

shipping

damage,

es-

pecially

in

the

power

contactor

box,

hydraulic

power

supply,

and SMS

gates.

WARNING:

Applying

power

to

a

machine

with

loose

or

damaged

connections

in

these

areas

can

cause

damage

to

the

machine

and

its

surrounding

area.

3.

Connect

all

power

cables

from

mechanical

frame

to

electronic

frame

before

securing

them.

Level

electronic

frame

with

mechani-

cal

frame.

4. Swing

out

the

receiver

(see

*

Receiver

Swing

Out,

Section

2).

5.

Clean

the

disks

(see

*

Disk

Cleaning,

Section

2) .

6.

As

the

drawers

are

installed

(see

*

Drawer

Replacement,

Section

2),

inspect

the

drawer

and

clean

heads.

These

units

are

adjusted

at

the

plant

so

they

will

be

interchangeable

with

each

other.

7. Swing

receiver

into

the

array

(see

*

Receiver

Swing-In,

Section

2).

Check

for

binds

in

load-

ing

mechanism.

8.

Manually

load

and

unload

heads

to

ensure

correct

alignment.

WARNING:

Never

load

or

unload

the

heads

when

they

are

out

of

the

array.

9.

Push

access

fully

into

disk

array

against

inner

crash

stop.

10.

Check

that

the

carriage-way

wipers

are

not

*

Refer

to

1301 CE

Heference

Manual

227-5583-1 (11-62)

dry

and

that

the

way

is

not

dirty.

11.

Replace

actuator

shield.

12.

Before

applying

power,

check

that

the

voltage

at

outlet

agreos

with

the

amount

shown on

the

nameplate.

13.

Start

disk

drive

motor

and

check

disk

rotation

as

indicated

by

arrow

on

filter

frame.

Turn

on

electronic

DC,

gate

blowers,

solenoid

DC.

and

hydraulic

power

supply.

WARNING: Do

not

load

the

heads.

14.

Reinspect

drawer

profiles.

15. Allow

the

disk

array

to

run

(purge)

for

1-1/2

hours

before

loading

the

heads.

16.

Load

heads

for

30

minutes.

17. Unload

heads

and

turn

machine

off.

Check

rundown

time

of

disk

array

and

compare

it

to

the

run

-down

time

recorded

on

the decal

in

the

power

sequence

gate.

Run

-down

time

at

installation

should

not

be

shorter

than

recorded

time

minus

four

minutes.

18.

After

the

disks

have

come

to

a

complete

stoP.

remove

the

access

cover

and

again

inspect

and

clean

heads

and

disks.

19.

Manually

load

and

unload

heads

to

ensure

correct

alignment.

20.

Replace

actuator

shield.

21.

Purge

system

for

15

minutes

before

loading

heads.

22.

Reinspect

the

heads

and

disks

again

at

the

end

of

the

first,

second

and

third

week

of

operation.

After

that

time

refer

to

the

Scheduled

Maintenance

Routine

Chart

in

Section

1

for

correct

inspection

frequency.

Installation

Instructions

5

CONTENTS

Approach

to

Scheduled

Maintenance.

•

Visual

Inspection

• • • • • • •

Scheduled

Maintenance

Procedures

Solid

State

Circuits

•••••

APPROACH

TO SCHEDULED MAINTENANCE

• 1. 1

• • 1. 1

The

prime

objective

of

any

maintenance

activity

is

to

provide

maximum

machine

availability

to

the

custom-

er.

Every

scheduled

maintenance

operation

should

assist

in

realizing

this

objective.

Unless

a

scheduled

maintenance

operation

decreases

machine

downtime,

it

is

unnecessary.

With

the

exception

of

the

gimbal

torques,

do

not

adjust

or

disassemble

a

unit

that

is

working

properly,

even

if

tolerances

vary

from

those

specified.

Absolute

cleanliness

is

essential

to

proper

oper-

ation

and

maintenance

ofthis

machine.

A

Hoover

86

vacuum

or

one

of

comparable

efficiency

should

be

used

to

ensure

cleanliness

of

machine

components

and

surrounding

areas.

Visual

Inspection

Visual

inspection

is

the

first

step

in

every

scheduled

maintenance

operation.

Always

look

for

corrosion,

dirt,

wear,

cracks,

binds,

burned

contacts,

and

loose

connections

and

hardware.

Alertness

in

noticing

these

items

may

save

machine

downtime

later.

SCHEDULED MAINTENANCE

PROCEDURES

Specific

items

of

scheduled

maintenance

are

scheduled

on

punched

cards

processed

in

the

Central

Processing

unit

for

the

branch

office.

Details

of

scheduled

maintenance

operations

are

listed

in

the"

Scheduled

Maintenance

Routine

Chart.

"

During

normal

scheduled

maintenance,

perform

only

those

operations

listed

on

227-5583-1 (11-62)

SECTION 1. SCHEDULED MAINTENANCE

Mechanical

Units • • • • • • • • • • •

Electronic

Scheduled

Maintenance

Routine

•

Motion

Oscillator

Check

•

Access

Time

Check.

Head

Motion

Check.

• . • •

••

1. 1

•

••

1. 1

•

••

1. 1

•

.1.2

•

••

1. 2

the

chart

for

that

maintenance

period.

Details

on

ad-

justments'

service

checks,

and

removal

and

replace-

ment

are

given

in

the

pages

listed

in

the

index

column

of

the

chart

(F

igure

1-1).

Observe

all

safety

practices.

Solid-State

Circuits

Diagnostic

programs

are

the

basic

tools

used

in

sched-

uled

maintenance

of

solid-state

circuits.

These

are

effecti

ve

in

locating

potential

and

intermittent

troubles.

These

items

are

also

excellent

troubleshooting

tools.

When

using

them

for

scheduled

maintenance,

use

them

only

as

directed

on

the

scheduled

maintenance

chart.

Diagnostic

programs

are

available

through

the

system

to

which

the

machine

is

attached.

Do

not

adjust

pulses

unless

the

condition

of

the

machine

warrants

it.

Mechanical

Units

Three

basic

scheduled

maintenance

steps

that

are

performed

on

every

machine

are

cleaning,

lubri-

cation,

and

inspection.

Remember,

do

not

do

more

than

recommended

scheduled

maintenance

on

equip-

ment

that

is

operating

satisfactorily.

ELECTRONIC

SCHEDULED MAINTENANCE ROUTINE

Motion

Oscillator

Check

--

05.16.01.

1

Check

the

output

of

the

motion

oscillator

(pinA

of

TDS-

at

0

lA2E08)

and

adjust

if

necessary.

This

adjustment

Scheduled

Maintenance

1.1

must

be

made

only

when

the

actuator

is

stationary.

1.

If

the

actuator

is

cold,

the

oscillator

should

be

on

low

range

(-12

volts

not

being

applied

to

OIA2E08C).

The

time

for

one

cycle

is

between

6.1

to

6.8

milliseconds.

2. With

the

actuator

at

normal

operating

temper-

ature

and

-12

volts

to

01A2E08C.

adjust

the

oscillator

to

4.

125±

.100

milliseconds.

If

it

is

necessary

to

check

and

adjust

this

before

temperature

of

oil

reaches

normal,

it

will

be

necessary

to

clip

-12

volts

to OIA2E08C.

by-

passing

the

thermal

switch.

Be

'sure

to

re-

move

this

jumper.

Access

Time

Check

--

06.03.01.

1

Access

time

is

the

interval

from

the

instant

that

a

change

in

the

track

portion

of

the

locate

register

is

detected

until

the

end

operation

trigger

is

set.

Sync

on the

desired

change

in the

track

portion

of

the

locate

register

and

check

the

time

from

the

change

to

the

following

set

of

the

end

operation

trigger.

The

oil

temperature

must

be

normal

and

the

oscil-

lator

must

be

at

4.125

± .100

ms.

1.2

1.

Set

the

address

of

any

cylinder,

1

through

15,

into

the

access

register.

Set

and

reset

the

register.

Maximum

access

time

should

be

84

milliseconds.

2.

Set

the

address

of

any

cylinder,

16

through

63,

into

the

access

register.

Set

and

reset

the

register.

Maximum

access

time

should

be

153

milliseconds.

3.

Set

the

address

of

any

cylinder.

64

through

255,

into

the

access

register.

Set

and

reset

the

register.

Maximum

access

time

should

be

223

milliseconds.

Head

Motion

Check

--

04.52.01.

1

or

04.

53.01.1

"Head

motion"

is

an

indication

that

the

access

has

not

slowed

enough

to

allow

the

detent

to

be

inserted

safely.

1.

Adjust

the

detent

safety

integrator

(TED-

6B09

or

6D09)

so

a

single

pulse

at

the

input

(pin

D)

causes

a +N

pulse

out

(pin A)

of

at

least

7

milliseconds

duration.

2.

Set

address

50

in

the

access

register.

Set

and

reset

the

register

and

observe

OIA4H15A

with

an

oscilloscope.

If

the

signal

looks

like

Figure

1-2,

the

integrator

pulse

is

too

narrow

and

shouldbe

increased

so

the

picture

appears

as

Figure

1-3.

3.

Set

and

res

et

different

addresses

in

the

access

register,

detent

safety

must

resemble

Figure

1-3

on

any

address

change

greater

than

50

cylinders.

4.

Address

changes

from

10

to

49

should

also

resemble

Figure

1-3,

but

the

shorter

strokes

may

begin

to

resemble

Figure

1-2.

Address

changes

of

less

than

10

cylinders

will

be

very

erratic

about

indicating

not

detent

safety

condition.

CODE

8

9

a

9

UNIT

Electronic

Circuits

Actuator

Hydraulic

Power

Supply

Blowers &

Filters

Data

&

Clock

Head

&Arm

Assembly

Disk Array

Fi

Iter

Base

Head

Load

linkage

Compressed

Air

System

Hydaulic

Power

Supply

FREQ.

WEEKS

4

8

26

52

LUBRICATE

--

CLEAN

Do

not

use

any

solvent

on

any

actuator

moving

parts.

Wipe

actuator

way

clean

with

a

clean

lint-free

tissue,

dampened

with

IBM

#6.

Leave a

light

film

of

oil

on

ways.

Put

5-6

drops of

IBM

#6

on

the

wi

pers.

Do

not

saturate

wipers.

Add

oil

to

reservoir

as

required.

Lubricate

the

three

blower

bearings

with

IBM

#6

Remove

any

accumulated

dirt

from arm

assembly.

If

required,

clean

heads

with

lint

free

tissues,

isopropyl

alcohol,

and

head

cleaning

paddle.

Absolute

Cleanliness

is

Essential.

Oi

I

head

load

linkage

with

IBM

#6.

Oil

sparingly.

These links

are

not

high

speed

and

are

seldom

operated.

Lubricate

rack

assembly

and

gear

rack

block

assembly

sparingly

with

IBM#6.

Open

shut-off

valve

on

air-

pipe

air

line

to

drain

any

accumulated

moisture

from

the

tank.

Replace

magnetic

fi

Iter.

Do

not

clean.

Return

filter

to San

Jose.

Figure

1-1.

Scheduled

Maintenance

Routine

Chart

227-5583-1 (11-62)

OBSERVE

Perform

Electronic

Routine

After

oiling

and

cleaning

actuator

way,

check

gib

adjustment.

Check

wi

pers for

wear

-

replace

if

worn,

or

if

excessively

blackened.

Check

that

aluminum

wiper

holders

do

not

touch

housing

ways

Check

output

shaft

seal

for

leaks.

If

felt

wiper

of

shaft

seal

appears

saturated,

the

seal

is

I

eaking

and

should

be

replaced.

Check

felt

oil

retainers.

Replace

when

over

saturated

with

oil.

Check

system pressure

550

±

10

PSI.

Check

pressure

differential

across

mechanical

filter.

Record pressure

drop

on

decal

inside

power

sequence

gate.

Replace

fi

Iter

if

pressure

drop

is

35

PSI

or

greater

or

if

it

has

decreased

more

than

5

PSI

since

Ias t

readi

n9.

Do

not

clean.

Re

turn

fil

ter

to San

Jose.

Check

oi

I

temp-

1200

1:

3°F.

Check

cool

ing system

pressure

50

± 10 PSI.

Check

SMS

gate

filters.

If

dirty,

clean

by

flushing

with

hot

water.

Shake

and

let

drip

dry.

Check

power

supply

blower

fil

ter.

Check

all

heads

for

smooth

surface

finish.

Check

head

for

freedom

in

cone

pivots - -

pitch

and

roll

30

grams

maximum.

Pitch

10 grams

and

roll

3grams

minimum.

Use

gram

gage

2108473.

The

disk

array

fi

Itel-

will

normally

last 3

years

on

single

shift

operation.

However,

adverse

environmental

conditions

can

cause

it

to

become

heavily

clogged.

Replace

this

filter

if

it

has

over

1/4"

of

dirt

accumulation

or

at

the

end

of 3

years.

Mark

installation

date

on

new

filter.

Check

line

cords

for

safe

condition

and

grounding.

Check

run-down

time

and

compare

it

with

run-down

time

recorded

on

decal

on

power

sequence

gate

door.

Replace

motor

if

run-down

time

is

less

than

60%

of

original

run-down

time.

Check

that

system

pressure

is

between

42

and

44

PS

I

with

heads

loaded.

Compressor shou

Id

turn

on

no

more

often

than

once

every

30

minutes.

If

frequency

increases,

check

air

system for

leaks.

Compressor shou

Id

pump

up

system full y

and

turn

off

within

45

seconds.

PAGE

1. 1

Scheduled

Maintenance

1.3

Figure

1-2.

Short

Stroke

-\

I_At

least 7ms.

Figure

1-3.

Long

Stroke

1.4

CONTENTS

Disk Array

••••••

Disk Array

Filter

•

Disk Array Shields

Plastic

Shields -Front

and

Rear

•

Index

Shield

Access Port

Shield

•

Index

Heads

Disks

••••

Disk

Shaft

Motor

Disk

Drive

Thermal

Overload

Switches

Receiver

Assembly

••

• • • •

Receiver

as

an

Assembly • •

Drawer Assembly

••••

Head

••••••••••

Swing-out

Interlock

Microswitch

••

Clock

Head

•••••••••••••

Clock

Head

as

an

Assembly

Clock

-Head

Arm Assembly

Hydraulic

Actuator

• • •

Actuator

Carriage

•••

Carriage

Gib.

•

Yoke

Assembly

Carriage

Flexure

Rods

••

Yoke

Inner

Limit

Stops

Limit

Switches

• • • • •

Inner

Limit

Switch

•

Outer

Limit

Switch

*

Refer

to

1301 CE

Reference

Manual

DISK ARRAY

INDEX HEADS

Service

Check

• • • • •

2.1

*

•

2.1

•

2.1

*

• •

2.1

· . *

· *

•

2.2

*

•

2.2

• •

2.2

· *

The

+N

early

index

out

of

ANZZ 6B18 B

and

G

should

be

a

minimum

of

25

microseconds

(Figure

2-1).

If

the

output

resembles

Figure

2-2,

check

inputs

for

a

minimum

negative

shift

of

1. 3

volts.

If

less,

the

transducer

air

gap

must

be

adjusted.

227-5583-1 (11-62)

SECTION

2.

SERVICING

PROCEDURES

Actuator

Output

Shaft

Seal

•••••••••

Detent

Safety

Transducer

Detent

Detector

• •

Motion

Oscillator

•

Access

Time.

• • •

Access

Cover

•••

Hydraulic

Power Supply

Hydraulic

Power Supply as

an

Assembly

•

Oil

Level

••••••••••••••

System

Pressure

Relief

Valve

Cooling

System

Pressure •

Mechanical

Filter

• •

on

Temperature.

Magnetic

Filter

• •

Unloading

Valve.

•

Pressure

Switch

• •

TIlermal

Switches

•

Power

Sequence

Control

• • •

Power

Supplies

• • • • • • • •

48

v Supply

(Relay

and

Actuator)

•••

DC Supplies

Electronic

Components

•••••••

Read

Circuits

• • • • • • • • • • •

Read

Amplifier

Calibration

Read

Amplifier

Noise

Rejection

DisJ<

Surface

Requirements

Gate

Ventilating

System

••

Compressed

Air

System

•••••

DISKS

Removal

and

Replacement

*

2.2

*

2.2

*

2.2

2.3

*

2.3

*

The

removal

and

replacement

procedure

for

this

unit

is

the

same

as

that

for

the

1301

with

the

following

exception:

If

the

data

from

the

disks

does

not

have

to

be

retrieved

after

reassembly,

it

is

not

necessary

to

scribe

the

data

disks.

However,

the

sector,

index,

and

address

disks

should

be

scribed

to

allow

realignment

during

reassembly.

CLOCK

HEAD

The

service

procedures

for

the

353

are

the

same

as

those

for

the

1301

with

the

following

exceptions:

Servicing

Procedures

2.1

The

clock

frequency

of

the

353

is

270

kc

±

1%.

The

353

clock

can

be

rewritten

using

the

CE

clock

write

box:

1.

Disconnect

normal

clock

circuits

and

connect

clock

write

box

as

noted

on

page

03.01.01.0

of

the

system

diagrams.

2.

Erase

the

old

track

by

depressing

the

Erase

key

for

at

least

one

disk

revolution.

3.

Depress

the

Write

key

for

at

least

one

disk

revolution.

HYDRAULIC ACTUATOR

Service

Check

The

service

check

for

this

unit

is

the

same

as

that

for

the

1301

with

the

following

exception:

Replace

the

step

of

the

service

check

that

says

"Set

Access

Inop,

"with"

Set

CE

testswitch

on

CE

panel

to

CE

position.

II

Removal

and

Replacement

The

removal

and

replacement

procedure

for

this

unit

is

the

same

as

that

for

the

1301

with

the

following

exception:

When

measuring

the

resistance

of

the

detent

de-

tector

coil

,refer

to

system

diagrams

page

04.52.01.1.

LIMIT SWITCHES

Inner

Limit

Switch

Service

Check

The

service

check

for

this

unit

is

the

same

as

that

for

the

1301

with

the

following

exception:

The

inner

limit

switch

must

be

made

when

the

carriage

is

at

cylinder

256,

and

not

made

when

the

carriage

is

at

cylinder

255.

Adjustment

The

adjustment

procedure

for

this

unit

is

the

same

as

that

for

the

1301 with

the

following

exception:

Adjust

the

eccentric

adjusting

screw

until

the

switch

is

made

at

cylinder

256

and

not

made

at

cy

linder

255.

2.2

ACCESS TIME

Se

rvice

Check

Access

time

is

the

interval

from

the

instant

that

a

change

in

the

track

portion

of

the

locate

register

is

detecteduntil

the

end

of

the

operation

trigger

is

set.

Sync on

the

desired

change

in

the

track

portion

of

the

locate

register

and

check

the

time

from

the

change

to

the

following

set

of

the

end

operation

trigger.

The

oil

temperature

must

be

normal

and

the

oscillator

at

4.125

± .100

ms.

1.

Set

the

address

of

any

cylinder,

1

through

15,

into

the

access

register.

Set

and

reset

the

register.

Maximum

access

time

should

be

84

milliseconds.

2.

Set

the

address

of

any

cylinder,

16

through

63,

into

the

access

register.

Set

and

reset

the

register.

Maximum

access

time

should

be

153

milliseconds.

3.

Set

the

address

of

any

cylinder,

64

through

255,

into

the

access

register.

Set

and

reset

the

register.

Maximum

access

time

should

be

223

milliseconds.

POWER

SUPPLIES

DC

SUPPLIES

There

is

a 750

watt

supply

in

the

353

and

a 2000

watt

supply

in

the

354;

these

supplies

are

standard

400-

cycle

7030

system

supplies

and

are

serviced

in

a

like

manner.

ELECTRONIC COMPONENTS

READ

CmCUITS

WARNING:

Do

not

put

scope

probes,

leads

or

jumpers

of

any

kind on

the

lines

coming

directly

from

the

data

heads.

The

heads

can

be

damaged

and/or

data

destroyed

by

possible

potential

differences.

The

peak-to-peak

signal

at

the

input

to

the

pre-amplifier

(ANG-)

should

not

be

less

than

15

millivolts,

or

more

than

70

millivolts

for

any

300

microsecond

period.

Waveforms

showing

input

and

output

signals

for

special

circuit

cards

are

in

system

diagrams

manual.

Read

Amplifier

Calibration

Three

potentiometers

have

been

used

in

the

read

amplifiers

and

bit

detectors

to

facilitate

setting

the

regulated

signal

output

and

the

bit

detection

threshold.

The

following

calibration

procedure

is

recommended:

1.

Deselect

the

heads

by

depressing

GENERAL

RESET

on

the

Disk

Synchronizer,

and

balance

the

DC

level

appearing

at

pins

Hand

G

of

the

Overdriven

and

Limiter

Amplifier

(AMX-) to

within

O.

1

volt

of

each

other

by

means

ofthe

potentiometer

on

the

card.

2. Set

the

machine

to a

continuous

read

condition

on

the

track

and

sector.

Cylinders

around

132

should

be

used

because

the

amplitude

difference

between

single

bit

and

all

bit

patterns

at

that

location

will

be

slight.

3.

Use

a

1-to-1

or

a X10

compensated

probe

with a wide band

(2

mc

or

greater)

preampli-

fier.

Sync

on

index;

use

an

expanded

scale

of

about

50

microseconds

per

cm,

and

observe

an AGC

burst

on

pins

A and F of

the

second

Linear

Amplifier

(ANF-)

(Figure

2-3).

4.

Adjust

the

voltage

level

that

appears

at

these

pins

for

a

value

offrom

6 v to

6.25

vby

means

of

the

potentiometer

on

the

AGC

Detector

(A

UE-).

5.

If

this

voltage

level

cannot

be

obtained,

the

AGC

Detector

(AUE-),

the

Variable

Gain

227-5583-1 (11-62)

Amplifier

(ANE-),

and

the

subsequent

two

linear

amplifiers

(ANF-)

should

be

checked.

NOTE: On

some

machines,

the

card

code

for

the

AGC

Detector

may

be

listed

as

ANH-j

A

UE

-

is

the

later

designation.

6.

Referring

to

Figure

2-4,

observe

the

wave-

form

that

appears

at

A

of

the

OR-

AND

(ANW-)

and

by

means

of

the

potentiometer

on

this

card

adjust

the

clipping

level

to

50%.

NOTE:

This

is

easily

accomplished

by

maintaining

E2

(Figure

2-4)

at

a

constant

vertical

de-

flection

of

one

cm

(by

means

of

the

oscil-

loscope

variable

voltage

control),

and

by

adjusting

the

potentiometer

on

the

OR-

AND

(ANW-) to

obtain

a

vertical

oscilloscope

deflection

of

two

cm

for

E1

(Figure

2-4).

It

is

very

important

that

the

base

line

of

reference

used

for

measuring

the

clipping

level

be

after

the

recovery

time

as

shown.

Any

overshoot

is

to

be

disregarded

in

the

measurement

of

the

50%

level.

DISK SURFACE REQUIREMENTS

The

353

disks

are

mechanically

and

electronically

perfect.

Servicing

Procedures

2.3

-+N-

--N-

Figw'e

2-1.

Correct

Index

Pulse

~+N-

--N-

Figure

2-·2.

Incorrect

Index

Pulse

Figure

2-3.

Voltage

Output

of

Second

Unear

Amplifier

J\NU\/

J::.

----AGe

Burst

-_tRecover¥

Time+aUiescent

About

50

~sec

level

Figure

2-4.

Read

Amplifier

Clipping

Level

2.4

Q.=

50%

EI

CONTF.NTS

Troubleshooting Hints • • • • • • •

Clamping

••

Actuator

Switching

•••

Read

Malfunctions.

• • •

Read/Write

Failures

Access

Malflmctions

• • •

Service

Checks

• • • • • • • • • •

TROUBLESHOOTING HINTS

.3.

1

.3.1

.3.

1

.3.2

••

3.2

.3.2

WARNING:

Voltage

is

present

on

both

sides

of

most

circuit

cards.

Metal

caps

of

transistors

are

often

a

part

of

the

circuit.

Avoid

pulling

or

replacing

cards

when

power

is

on

since

a

resul

tant

short

could

damage

transistors

or

other

circuit

components.

Solenoid

Driver

No. 2

(TDR-)

must

never

have

-48

v

on

it

alone.

If

this'

card

is

removed

from

the

gate

there

is

a

possibility

ofthis

condition

occurring.

Solenoid

DC

and

electronic

DC

must

be

turned

off

prior

to

removing

this

card.

Intermittent

problems

can

sometimes

be

aggra-

vated

by

vibration.

Tappingthe

edge

of

the

cards

with

the

plastic

end

of

a

screw

driver

in

the

area

suspected

should

be

sufficient.

Caution

is

required

since

too

violent

a

vibration

can

cause

adjacent

card

components

to

short.

It

may

become

necessary

or

desirable

to

jumper

in

signals

or

voltages

to

specific

inputs

or

outputs

to

check

certain

functions.

If

this

is

done,

be

careful

that

the

logic

blocks

are

not

overloaded

because

erroneous

indications

will

result.

More

important

is

the

use

of

voltages

that

can

damage

or

destroy

the

transistors.

For

the

majority

oflogic

block

cases,

a

properly

placed

ground

will

create

the

effect

de-

sired.

All

other

cases

must

be

treated

individually

based

on

knowledge

of

the

circuits

involved.

Special

circuit

card

diagrams

are

shown

in

the

system

diagrams.

Also

shown

are

input

and

output

waveforms

for

most

of

these

cards.

227-5583-1

(11-62)

SECTION 3. SERVICE AIDS

Access

Cover

Safe

Switch

....

.3.2

DC

Voltages

.....

.3.2

Standard

Modular

System

Maintenance

.3.2

CE

Service

Aids ..... ....

.3.2

Hydraulic

Manual

Selector

Valve

••

.3.2

Power

Sequence

Controls

.3.2

Power

Sequence

Panel

.3.3

Clamping

to

Noncurrent

State

A

limiting

resistor

is

not

needed

when

clamping

to

the

noncurrent

state.

+N

is

the

noncurrent

N

line;

clamp

to

+6

volts.

-P

is

the

noncurrent

P

line;

clamp

to

-12

volts.

Clamping

to

Current

State

A

limiting

resistor

(5K

to

7K,

1/2

watt)

is

necessary

when

clamping

to

the

current

state.

-N

is

the

current

N

line;

clamp

to

-6

volts.

+P

is

the

current

P

line;

clamp

to

ground.

Actuator

Switching

The

electrical

connectors

on

the

hydraulic

actuators

are

interchangeable.

Change

these

if

you

have

determined

that

an

actuator

is

failing.

If

the

actu-

ator

is

at

fault,

the

-mechanism

will

still

fail

even

though

the

controls

are

switched.

Read

Malfunctions

WARNING: Do

not

put

scope

probes,

leads,

or

(

jumpers

of

any

kind

on

the

lines

coming

directly

Service

Aids

3.

1

from

the

data

or

format

heads.

The

heads

can

b~

damaged

and/or

data

destroyed

by

possible

potential

differences.

1.

Failure

of

the

read

amplifier

to

reject

line

noise

can

be

caused

if

the

receiver

is

not

electrically

isolated

from

frame

ground.

2.

Read

failures

can

be

caused

by

a

noncali-

brated

read

amplifier

or

a too

long,

or

too

short,

single-shot

pulse.

3.

Readfailures

can

be

caused

ifheads

are

not

fully

loaded.

This

condition

will

cause

de-

creased

output

from

all

heads

of

a

module.

For

this

condition

to

occur,

the

heads

loaded

microswitch

would

also

have

to

be

in

incorrect

adjustment.

Read/Write

Failures

1.

Failure

of

the

clock

read

circuit

will

cause

read

and

write

failures.

Check

that

the

clock

line

drive

is

gating

and

passing

clock

signals

properly.

2.

Incorrect

adjustment

or

loosening

of

the

carriage

yoke

assembly

can

cause

read

or

write

failures.

3.

The

input

voltage

must

remain

within

±10%.

This

tolerance

includes

any

variable

combi-

nation

of

steady

state

and/or

short

duration

transient~

.

Access

Malfunctions

1.

Failure

to

go to

the

correct

cylinder

can

be

caused

by

a blown fus

e.

2.

Access

failure

can

be

caused

by

a

partially

opened

access

door

or

by

failure

of

the

interlock.

3.

Failure

of

the

motion

oscillator

to

switch

to

slow

speed

can

cause

the

access

to

be

set

inop when

the

hydraulic

oil

is

cold.

4.

Excessive

access

time

can

be

caused

by

failure

of

the

oscillator

to

switch

to

high

speed.

SERVICE CHECKS

Access

Cover

Safe Switch

~Then

the

access

cover

door

is

opened

or

removed,

this

switch

will

open

and

cause:

3.2

1.

The

access

to

be

set

INOP.

2.

The

access

register

set

pulse

to

be

blocked

(from

system).

3.

Rezero

to

be

held

off.

4.

Access

Register

to

be

held

reset.

I

CAUTION:

If

solenoid

DC

is

dropped

for

any

reason,

the

actuator

may

attempt

to

move

under

hydraulic

pressure.

Service

this

unit

with

caution.

DC

Voltages

1.

The

48 v

relay

supply

must

be

a

minimum

of

44.6

v

and

a

maximum

of

50.4

v.

2.

The

DC

supply

voltages

must

be

within

±

2%

rated

output

voltage

at

the

laminar

bus

on

the

gates.

STANDARD MODULAR SYSTEM MAINTENANCE

All

normal

maintenance

of

standard

modular

system

components

is

found

in

Form

223-6900,

Standard

Modular

System.

Included

in

this

form

are:

Wrapped

-Wire

Connections

Crimped

Connections

Soldered

Connections

Wiring

Rules

SMS

Service

Tools

SMS

Card

Maintenance

Measurements

Ventilating

Systems

CE

SERVICE AIDS

HYDRAULIC MANUAL

SELECTOR

VALVE

The

hydraulic

selector

valve,

is

used

to

check

cooler

system

(CS),

upstream

(USP) ,

and

system

pressures

(SP).

The

selector

valve

can

also

be

used

to

circulate

(Cm)

oil

through

the

system.

The

selector

valve

should

be

in

HP

(home

position)

when

the

system

is

being

used.

POWER SEQUENCE CONTROLS

The

power

sequence

control

panel

(Figure

3-1)

pro-

vides

the

facilities

for

starting

and

stopping

the

file

during

normal

operations

and

ensures

proper

oper-

ation

of

file

components.

The

sequence

control

may

IBM 353 User manual

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