Commodore computers Pc 1901 User manual

SERVICE MANUAL

PC

1901

MONOCHROME MONITOR

APRIL, 1987 PN-314970-01

Commodore

Business

Machines,

Inc.

1200

Wilson Drive,

West

Chester, Pennsylvania

19380

U.S.A.

Commodore makes no expressed or implied

war-

ranties

with

regard

to

the

information

contained

herein. The information is made available solely on

an as is basis, and

the

entire risk

as

to

quality

and

accuracy

is

with

the user. Commodore shall

not

be

liable

for

any consequential or incidental damages

in

connection

with

the

use

of

the

information

con-

tained herein. The listing

of

any available replace-

ment

part herein does

not

constitute

in any case

a recommendation,

warranty

or guaranty as

to

quality

or suitability

of

such replacement part.

Reproduction or use

without

expressed permission,

of

editorial or pictorial

content,

in any

matter

is

prohibited.

This manual contains

copyrighted

and proprietary

information.

No

part

of

this

publication

may

be reproduced, stored in a retrieval

system,

or

transmitted

in any

form

or

by

any

means, electronic, mechanical,

photocopying, recording or otherwise,

without

the prior

written

permis-

sion

of

Commodore Electronics Limited.

Copyright

©

1987

by

Commodore Electronics Limited.

--

--------------------------- -

-------

.~---------------------

1901 SERVICE MANUAL

IMPORTANT SAFETY NOTICE

Proper service and repair is

important

to

the

safe, reliable operation

of

all NAPCEC Equipment. The

service procedures recommended

by

NAPCEC and described in

this

service manual are

effective

methods

of

performing service operations. Some

of

these service operations require

the

use

of

tools

specially designed

for

the

purpose. The special

tools

should be used

when

and as recommended.

It

is

important

to

note

that

this

manual contains various CAUTIONS and NOTICES

which

should

be

carefully read in order

to

minimize

the

risk

of

personal injury

to

service personnel. The

possibility

ex-

ists

that

improper service methods

may

damage the equipment.

It

also is

important

to

understand

that

these CAUTIONS and NOTICES

ARE

NOT EXHAUSTIVE. NAPCEC could

not

possibly

know,

evaluate and advise

the

service trade

of

all conceivable

ways

in

which

service

might

be done or

of

the

possible hazardous consequences

of

each

way.

Consequently, NAPCEC has

not

undertaken any

such broad evaluation. Accordingly, a servicer

who

uses a service procedure or tool

which

is

not

recom-

mended

by

NAPCEC

must

first

satisfy

himself

thoroughly

that

neither his

safety

nor

the

safe opera-

tion

of

the

equipment

will

be jeopardized

by

the

service

method

selected.

WARNING

Critical

components

having special

safety

characteristics are

identified

with

an

S

by

the Ref. No.

in

the

parts list and enclosed

within

a broken line* along

with

the

safety

symbol A on

the

schematics or exploded

views.

Use

of

substitute replacement parts

which

do

not

have the same

specified

safety

characteristics may create shock, fire, or other

hazards.

Under no circumstances should the original design be modified

or altered

without

written

permission from the N.A.P. Consumer

Electronics Corp. NAPCEC assumes no liability, express or

implied, arising

out

of

any unauthorized

modification

of

design.

Servicer assumes all liability.

*Broken line:

..._.....

_._

...

_._------

1901 SERVICE MANUAL

TABLE OF

CONTENTS

TITLE PAGE

SPECIFICATIONS

..................................................

.

SAFETY

GUiDELINES................................................

2

CIRCUIT

DESCRiPTION...............................................

4

ADJUSTMENTS.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

CHASSIS

REMOVAL.................................................

5

PICTURE TUBE REMOVAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

..

5

MEASUREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

PARTS

LIST.......................................................

7

PCB

LAyOUT......................................................

10

SCHEMATIC

DIAGRAM.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

..

12

CAUTION

USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING.

.-

-

1901 SERVICE MANUAL

PC

1901

MONOCHROME MONITOR

(NAP -7BM613)

SPECIFICATIONS

Picture Tube: 12" measured diagonally with

glare reducing surface treatment

Deflection Angle: 900

Phosphor Type: P39 Green (BM7513, 7BM613)

LA

Amber (BM7523, 7BM623)

Video Input Signal: TTL level digital video, separate

horizontal and vertical syncs.

(7BM613, 7BM623)

Video Amp Bandwidth: 20MHz

Horizontal Resolution: 800 lines (BM7513, BM7523)

1,000 lines (7BM613, 7BM623)

Character Field: 25 lines of 80 characters (2,000 total)

Power Supply: 120Vac ± 10%, 50-60Hz

Power Consumption: 30 Watts

Dimensions: 11.9"W x

11.1"0

x 10.9"H

*Subject to Modification

1

1901 SERVICE MANUAL

NAPCEC SAFETY GUIDELINES FOR THE

PROFESSIONAL SERVICE TECHNICIAN

Safety Checks

A

fter

the

original service

problem

has been cor-

rected,

a

complete

safety

check

should

be made.

Be sure

to

check

over

the

entire

set,

not

just

the

areas

where

you

have

worked.

Some

vicer

may

have

left

an

unsafe

condition,

which

could

be

unknowingly

passed on

to

your

customer.

Be sure

to

check

all

of

the

following:

Fire

and Shock Hazard

1.

Be

sure all

components

are

positioned

in

such

as

way

as

to

avoid

the

possibility

of

adjacent

component

shorts.

This is especially

important

on

those

chassis

which

are

transported

to

and

from

the

service

shop.

2. Never release a repaired receiver unless all

protective

devices

such

as

insulators,

barriers,

covers,

strain reliefs, and

other

hardware

have

been

installed

according

to

the

original design.

3.

Soldering

and

wiring

must

be

inspected

to

locate

possible

cold

solder

joints,

solder

splashes, sharp solder points,

frayed

leads, pin-

ched leads, or damaged insulation (including ac

cord).

Be

certain

to

remove

loose

solder

balls

and all

other

loose

foreign

particles.

4.

Check

across-the-line

components

and

other

components

for

physical

evidence

of

damage

or deterioration and replace

if

necessary. Follow

original

layout,

lead

length

and dress.

5.

No

lead or

component

should

touch

a receiv-

ing

tube

or a

resistor

rated

at

1

watt

or more.

Lead

tension

around

protruding

metal

surfaces

or

edges

must

be avoided.

6.

Critical

components

having

special

safety

characteristics

are

identified

with

an S

by

the

Ref. No. in

the

parts

list

and

enclosed

within

a

broken

line*

along

with

the

safety

symbol

on

the

schematics.

Replacement

parts

without

the

same

safety

characteristics

may

create

shock,

fire or

other

hazards.

7.

When

servicing

any

receiver,

always

use a

separate

isolation

transformer

for

the

chassis.

Failure

to

use a separate

isolation

transformer

may

expose

you

to

possible

shock

hazard, and

may

cause

damage

to

servicing

instruments.

8.

Many

receivers

use a polarized line

cord

(one

wide

pin on

the

plug).

Defeating

this

safety

device

may

create a

potential

hazard

to

the

ser-

vicer

and

the

user.

Extension

cords

which

do

not

incorporate

the

polarizing

feature

should

never

be used.

9.

After

re-assembly

of

the

set,

always

perform

an

ac

leakage

test

or

resistance

test

from

the

line

cord

to

all

exposed

metal

parts

of

the

cabinet.

Also,

check

all

metal

control

shafts

(with

knobs

removed),

antenna

terminals,

handles,

screws,

etc.

to

be sure

the

set

is safe

to

operate

without

danger

of

electrical

shock.

* Broken line:

-.

- . - -

--

Implosion

1. All picture tubes used in current model receivers

are equipped

with

an integral implosion system.

Care should

always

be used, and

safety

glasses

worn,

whenever

handling

any

picture

tube.

Avoid

scratching

or

otherwise

damaging

the

picture

tube

during

installation.

2. Use

only

replacement

tubes

as

specified

by

the

manufacturer.

X-radiation

1.

Be

sure

procedures

and

instructions

to

all

your

service

personnel

cover

the

subject

of

X-

radiation.

Potential

sources

of

X-rays

in

TV

receivers are

the

picture

tube

and

the

high

voltage

circuits.

The

basic

precaution

which

must

be

exercised

is

to

keep

the

HB

at

the

fac-

tory

recommended

level.

2.

To

avoid

possible

exposure

to

X-radiation

and

electrical

shock,

only

the

manufacturer's

specified

anode

connectors

must

be used.

3.

It

is essential

that

the

service

technician

has

available

at

all

times

an accurate

HV

meter. The

calibration

of

this

meter

should

be

checked

periodically

against

a

reference

standard.

4.

When

the

HV

circuitry

is

operating

properly

there

is no

possibility

of

an

X-radiation

prob-

lem.

High

voltage

should

always

be

kept

at

the

manufacturer's

rated

value-no

higher-for

op-

timum

performance.

Every

time

a

color

set

is

serviced,

the

brightness

should

be run

up

and

down

while

monitoring

the

HV

with

a

meter

to

be

certain

that

the

HV

does

not

exceed

the

2

-

specified value and

that

it

is regulated correctly.

We

suggest

that

you

and

your

service

techni-

cians

review

test

procedures so

that

HV

and

HV

regulation

are

always

checked

as a

standard

servicing procedure, and the reason

for

this pru-

dent

routine be clearly understood

by

everyone.

It

is

important

to

use an

accurate

and reliable

HV

meter.

It

is

recommended

that

the

HV

reading be

recorded

on

each

customers'

invoice,

which

will

demonstrate

a

proper

con-

cern

for

the

customers'

safety.

5.

When

troubleshooting

and

making

test

measurements

in a receiver

with

a

problem

of

excessive

high

voltage,

reduce

the

line

voltage

by

means

of

a

Variac

to

bring

the

HV

into

acceptable

limits

while

troubleshooting.

Do

not

operate

the

chassis

longer

than

necessary

to

locate

the

cause

of

the

excessive

HV.

6.

New

type

picture tubes are specifically designed

to

withstand

higher operating

voltages

without

creating

undesirable

X-radiation.

It

is

strongly

recommended

that

any

shop

test

fixture

which

is

to

be used

with

the

new

higher

voltage

chassis be

equipped

with

one

of

the

new

type

tubes

designed

for

this

service.

Addition

of

a

permanently

connected

HV

meter

to

the

shop

test

fixture

is advisable. The CRT

types

used

in

these

new

sets should never be replaced

with

any

other

types,

as

this

may

result in excessive

X-radiation.

7.

It

is essential

to

use

the

specified

picture

tube

to

avoid

a possible

X-radiation

problem.

8.

Most

TV

receivers

contain

some

type

of

emer-

gency

"Hold

Down"

circuit

to

prevent

HV

from

rising

to

excessive

levels in

the

presence

of

a

failure

mode.

These

various

circuits

should

be

understood

by

all

technicians

servicing

them,

especially

since

many

hold

down

circuits

are

inoperative

as long as

the

receiver

performs

normally.

Leakage

Current

Cold

Check

1.

Unplug

the

ac

line cord and

connect

a

jumper

between

the

two

prongs

of

the

plug.

2.

Turn

on

the

power

switch.

3.

Measure

the

resistance

value

between

the

jumpered

ac plug and all

exposed

cabinet

parts

of

the

receiver, such as

screw

heads,

antennas

and

control

shafts.

When

the

exposed

metallic

part has a return path

to

the

chassis,

the

reading

should

be

between

1

megohm

and

5.2

megohms.

When

the

exposed

metal

does

not

have

a

return

path

to

the

chassis,

the

reading

must

be

infinity.

Remove

the

jumper

from

the

ac line cord.

1901 SERVICE MANUAL

TO

INSTRUMENTS

O.151J

F

EXPOSED

.-£-~--~~--~~

METAL

PARTS

Leakage

Current

Hot

Check

WATER

PIPE

(EARTH

GROUND)

1.

Do

not

use

an

isolation

transformer

for

this

test.

Plug

the

completely

re-assembled

receiver

directly

into

the

ac

outlet.

2.

Connect

a 1.

5k

ohm,

10

watt

resistor

paral-

leled

by

a 0.1 5uF.

capacitor

between

each ex-

posed

metallic

cabinet

part

and a

good

earth

ground

such

as a

water

pipe, as

shown

above.

3.

Use an ac

voltmeter

with

at

least

5000

ohms/volt

sensitivity

to

measure

the

potential

across

the

resistor.

4.

The

potential

at

any

point

should

not

exceed

0.75

volts.

A leakage

current

tester

may

be

used

to

make

this

test;

leakage

current

must

not

exceed

0.5

milliamps.

If

a

measurement

is

outside

the

limits

specified, there is a possibility

of

shock

hazard. The receiver should be repaired

and

re-checked

before

returning

it

to

the

customer.

5. Repeat

the

above

procedure

with

the

ac plug

reversed. (Note:

An

ac

adapter

is

necessary

when

a polarized

plug

is used.

Do

not

defeat

the

polarizing

feature

of

the

plug.)

Picture

Tube

Replacement

The

primary

source

of

X-radiation

in

this

television

is

the

picture

tube.

The

picture

tube

utilized

in

this

chassis is specially

constructed

to

limit

X-radiation

emissions. For continued X-radiation

protection,

the

replacement

must

be

the

same

type

as

the

original,

including

suffix

letter, or an N.A.P.

Consumer

Elec-

tronics

Corp. (NAPCEC)

approved

type.

Parts

Replacement

Many

electrical

and

mechanical

parts

in NAPCEC

television

sets

have

special

safety-related

characteristics. These

characteristics

are

often

not

evident

from

visual

inspection

nor

can

the

protec-

tion

afforded

by

them

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltage,

wattage,

etc.

The use

of

a

substitute

part

which

does

not

have

the

same

safety

characteristics

as

the

NAPCEC

recommended

replacement

part

shown

in

this

service manual

may

create

shock,

fire or

other

hazards.

3

-

CIRCUIT DESCRIPTION

This monitor

can

be

used

as

an

alphanumeric and

graphic display unit for the home and personal com-

puters. The screen is anti-reflecting which means that

the legibility of the image

is

extremely good. The

monitor has composite video signal input.

The monitor operates

on

a supply of 120V, 60Hz

ac.

The Power Transformer and CRT are mounted inter-

nally to the cabinet. The main panel has a Video

Preamplifier, Sync Channel, Vertical and Horizontal

Sweep Circuitry, Power Supply Horizontal AFC, and

Blanking Circuits. The On/Off control Video Gain Con-

trol and Brightness Control are mounted

on

the main

panel and extend through the cabinet front. The circuit

adjustments are mounted to the main panel.

Power Supply

120 volt, 60Hz

ac

operation. The

ac

section of this

receiver

is

designed for operation

on

120 volt, 60Hz

alternating current only. Never connect power cord to

a supply having a different frequency or voltage.

Overload Protection

This receiver incorporates a

.S

amp Slow-Blow fuse and

a 2 amp fuse

in

the

ac

circuit. These fuses provide pro-

tection to the chassis against certain electrical over-

loads.

5523

Horiz.

5ize-~;;;;:~

R406

Vert. Hold

1901 SERVICE MANUAL

ADJUSTMENTS

B+

Adjust

(R106)

Connect dc voltmeter to the collector of

TS101

and

allow receiver and test equipment to warm up for

20

minutes. Using a non-metallic tool, adjust

R106

to

obtain

11

Vdc ± 1%

on

voltmeter.

Focus (R336)

Adjust Focus Control for best overall detail

in

the center

portion of the picture.

Horizontal Oscillator

Adjustment

(R513)

Short

CS03

and R544 to ground. Adjust R513 for hori-

zontal stability of picture. Remove short between C503

and R544.

Vertical Size (R425)

Adjust the Vertical Size control (R425)

to

fill the screen

vertically.

Horizontal Size (S523)

Adjust horizontal size to fill up screen.

Vertical Linearity (R423)

Adjust vertical linearity control for equal spacing of

horizontal lines

at

the upper portion of the center of the

screen.

U102

Deflection

Yoke

~--IPo'wer

Transformer

---'---Video

In

Adjustment

Location -Rear View 4

-

Chassis Removal

1.

Remove

six

(6)

screws, four

(4)

of which

are

securing

cabinet back

to

cabinet front.

2.

Lay cabinet face down

on

a soft material

to

protect

picture tube and cabinet finish.

3.

Chassis Removal -Slide printed circuit board

assembly

to

rear

as

far

as

leads will allow for

ser-

vicing.

4.

Place chassis

on

the heat sink of

TS1

01.

In

this

posi-

tion the monitor remains stable

on

the work bench.

5.

Disconnect the picture tube socket

and

high voltage

anode lead

at

picture tube.

6.

Loosen

clamp screw securing deflection yoke

to

pic-

ture tube. Slide the yoke to the rear until clear of

the neck of the picture tube.

Caution: Before removing high voltage lead at

picture tube, discharge picture tube highvoltage

anode

to

ground only.

7.

To

replace components, reserve the above pro-

cedure.

8.

Note: Backcover Replacement -Printed Circuit

Board must slide into propertracks in backcover.

-------------------------

1901 SERVICE MANUAL

Picture Tube Removal

1.

Disconnect

HV

anode lead and picture tube socket

from picture tube. Loosen clamp screw securing

deflection yoke and slide yoke off neck of picture

tube.

2.

Lay cabinet face down

on

a soft material

so

as

not

to

scratch or

mar

the face of the picture tube

or

finish

on

cabinet.

3.

Slide printed circuit board assembly out of track.

4.

Remove screws from each of four

(4)

brackets hold-

ing picture tube

in

place. Slip mounting wire over

neck of tube.

5.

Using goggles

and

gloves, reach under face of tube

and lift from cabinet. Do not grasp neck

of

picture

tube at any time.

6.

To

install picture tube, reverse the preceding steps.

Exercise caution not

to

scratch

face

of picture tube.

CRT Board

T110

:

Power Transformer

--,~-

--~~.~--

'

SK1

Power

On/Off

Switch

5

-

'_.

MEASUREMENTS

Important

Read these instructions carefully and observe the con-

ditions noted when taking voltage readings or observ-

ing waveforms.

Picture tube high voltage anode may have a potential

10kV. Observe

all

high voltage precautions when ser-

vicing the chassis.

Use

safety goggles

and

gloves when

handling the picture tube.

Voltage Measurement Conditions Unless Otherwise

Specified

1.

Voltages measured

to

chassis using a digital volt-

meter.

2.

AC

power source 120V, 60Hz line.

3.

Voltage readings not

in

brackets taken using a pat-

tern generator (PM5519)

as

a signal source.

4.

Brightness control set

at

minimum, and contrast

control to maximum.

5.

Voltage values shown are average readings. Varia-

tions may

be

observed due to normal production

tolerances. Waveforms

1901 SERVICE MANUAL

Special Voltage Measurement Conditions

Picture tube anode voltage measured with VTVM high

voltage probe

at

line voltage of

120

volts

at

100llA

beam

current.

Waveform Measurement Conditions

1.

Waveforms taken using a pattern generator con-

nected

to

the input plug of the monitor.

2.

The video output signal of the generator adjusted

to

1 volt.

3.

Brightness control and contrast control set at maxi-

mum.

General Schematic Notes -See

"Notes"

on

Sche-

matic Diagram

G)~I

40V

OV--

G

/'\

iI

I

22SV

-2SV-J

L.J

l

®"v-n

I ® ®

10V

1/lIloV

ov

__

l/l

I4v

ov--

0 0 0

4v_1/\12v

~I23v

ov_HI23v

ov-

e @

ov_J~I4v

(0

J\JLI

HI23v

l1V

ov--

OV

0

ov_V'1Isv

6

-

--

-----------------------~---------------------------

1901 SERVICE MANUAL

REPLACEMENT PARTS LIST

TO

ENSURE

OPTIMUM

PERFORMANCE

AND

RELIABILITY

ALWAYS

USE

GENUINE

FACTORY

REPLACEMENT

PARTS

WARNING

Critical

components

having special

safety

characteristics

are

identified

with

an S

by

the

Ref.

No.

in

the

parts

list

and

enclosed

within

a broken

line*

along

with

the

safety

symbol

A

on

the

schematics

or

exploded

views.

Use

of

substitute

replacement

parts

which

do

not

have

the

same specified

safety

characteristics

may

create

shock,

fire,

or

other

hazards.

CAPACITORS (All Ceramic, 50V unless otherwise specified)

S

C101

2.2nF., 100V, Cer. Disc.

S C102 2.2nF., 100V, Cer. Disc. 4H12231989

S C103 2.2nF., 100V, Cer. Disc. 4H12231989

C104

3300J.'F.,

25V, Electrolytic 4H12421466

C105 100pF., 50V, Cer. Disc. 4H12232156

C106 10nF., 63V, Electrolytic

C107 330nF., 16V, Electrolytic

S C110 47nF., 125V,

AC

4H12141348

S

C111

2.2nF., 125V,

AC

4H12232194

S C112 2.2nF., 125V,

AC

4H12232194

C301

2.2nF., 63V, Electrolytic

C302 470nF., 100V, Cer. Disc.

C303 22nF., 63V, Cer. Disc.

C304 100nF., 25V, Electrolytic

C305 27pF., 100V, Cer. Disc.

C321

22nF., 63V, Cer. Disc.

C322 100nF., 100V, Cer. Disc.

C323 100nF., 100V, Cer. Disc. 4H12421678

C331

100nF., 400V, Cer. Disc.

C341

1nF., 63V, Electrolytic

C342 15nF., 63V, Cer. Disc.

C343 10nF., 63V, Electrolytic

C401

10nF., 100V, Cer. Disc.

C402 10nF., 100V, Cer. Disc.

C403 4.7nF., 100V, Cer. Disc.

C404 3.3, 100V, Cer. Disc.

C405 270pF., 100V, Cer. Disc.

C406 10nF., 400V, Cer. Disc.

C421

220nF., 100V, Cer. Disc.

C422 56nF., 100V, Cer. Disc.

C423 820pF.,

50V,

Cer. Disc. 4H12232157

C424 220pF., 100V, Cer. Disc.

C431

270pF., 100V, Cer. Disc.

C432 100pF., 50V, Cer. Disc. 4H12232156

C433 100nF., 25V, Electrolytic

C434 220nF., 25V, Electrolytic

C435 4.7nF., 100V, Electrolytic

C501

2nF, 400V, Cer. Disc.

C502 680pF., 100V, Cer. Disc.

C503 15nF., 400V, Cer. Disc.

C504 560pF., 500V, Cer. Disc.

C505 4.7nF., 100V, Cer. Disc.

C506 10nF., 100V, Cer. Disc.

C507 4.7nF.,

63V,

Electrolytic

C508 270pF., 100V, Cer. Disc.

C511

1.5nF., 100V, Cer. Disc.

Under

no

circumstances

should

the

original

design

be

modified

or

altered

without

written

permission

from

the

N.A.P.

Consumer

Electronics

Corp.

NAPCEC

assumes

no

liability,

express

or

implied,

arising

out

of

any

unauthorized

modification

of

design.

Servicer

assumes

all

liability.

*

Broken

line: _ . _ . _ . _ .

CAPACITORS (Continued)

C512 1.5nF., 100V, Cer. Disc.

C513 5.6nF., 100V, Polyester 4H12150625

C514 10nF., 250V, Cer. Disc.

C515 100nF., 250V, Cer. Disc.

C521

47nF.,

25V,

Electrolytic

C522 47nF., 25V, Electrolytic

C523 22nF., 63V, Cer. Disc.

C524 100nF., 500V, Cer. Disc.

C525 22nF., 100V, Electrolytic

C526 560pF., 100V, Cer. Disc.

C527

4.7J.'F.,

160V, Electrolytic 4H12440387

C528 13nF., 400V, Polyester 4H12142192

C531

10nF., 500V, Foil 4H12142191

C602 22nF., 63V, Cer. Disc.

C603 22"F., 16V, Electrolytic 4H12440189

C604 10nF., 100V, Cer. Disc.

COILS & TRANSFORMERS

S321

6.8"F., Coil -Choke 4H15751998

S523 Coil -Horizontal Width 4H15751717

S524 Coil -Linearity 4H15751914

S T110 Transformer -Power 4H14630509

S

T521

Transformer -Horiz. Output 4H15050051

S T522 Transformer -Line Output 4H14010264

CONTROLS & SWITCHES

S

SK1

Power Switch -On/Off 4H27611161

R106 4.7k. B+ Adjust

4H1

001

0236

R303 470 ohm, Contrast 4H10020121

R331

1 Meg., Brightness Pre-set 4H10010103

R332 470k, Brightness 4H10020122

R336 2 Meg., Focus 4H10120727

R406 10k, Vertical Hold 4H10110547

R423 47k, Vertical Linearity 4H10010076

R425 330k, Vertical Size 4H10110548

R513 330 ohm, Horizontal Hold

4H

10020054

RESISTORS

(unless

otherwise

specified,

all

are

5%,

1/4W)

R101

150 ohm

R102

1k

R103 1.2k

Commodore Part Numbers are not available

at

this time. 7

-------------------------

1901 SERVICE MANUAL

REPLACEMENT PARTS LIST (Continued)

RESISTORS (Continued) RESISTORS (Continued)

R104 27k R502 150k

Rl05

15k R504 10kR50512k

Rl07

15k R506 2.2k

Rl08

lk

R511

560 ohm

R301

100 ohm R512 2.7k 4H11652918

R302 680 ohm R514 2.2k

R304 47 ohm R515 8.2k, Metal Film 4H11652865

R305 18k R516 8.2k

R306 4.7k R517 6.8k, Metal Film

4Hl1653064

R307 100 ohm R518 18k

R308 100 ohm R519 3.9k

R309 470 ohm R520 1.2k

R310 100k R522 220 ohm

R311

lk

R523 8.2 ohm, %W, Safety Resistor 4H1130506

R312 68k R524 1.8 ohm

R313 4.3k R525 390 ohm

R314 75 ohm S R526 1

k,

V.

W,

Safety Resistor 4H11130561

R316 68 ohm S R527 5.6 ohm, %

W,

Safety Resistor

41-111130502

R317 68 ohm S R528 100 ohm,

V4W,

Safety Resistor 4H11130535

R321

lk

(BM7513), (BM7523) R529 470 ohm

R321

820 ohm (7BM613), (7BM623)

R601

lk

R322 680 ohm R602

lk

R323

lk

R603

lk

R324 47k R604

lk

R325 18k R605 1.2k

R326 2.2k R606

l.2k

R327 1

k,

V4

W,

Metal Film

5Hl1654403

R607 470 ohm

R328 120 ohm,

112W

4Hll043083

R608 560 ohm

R329 330k R609 120 ohm

R330 120 ohm

R333 390k SEMICONDUCTORS -DIODES

R335 270k

R337 33k

4Hll150482

S 0101 Diode -Bridge Rectifier 4H13031174

R338 33k

4Hll150482

S 0102 Diode -Bridge Rectifier 4H13031174

R341

1.5 Meg. S 0103 Diode -Bridge Rectifier 4H13031173

R342 2.2k S 0104 Diode -Bridge Rectifier 4H13031173

R343 1k 0105 Diode -Zener 4H13034167

R344

lk

0321 Diode -Zener (BM7513), (BM7523) 4H13034278

R345 27k 0321 Diode

..

Zener (7BM613), (7BM623) 4H13030861

R401

6.8k 0322 Diode -Silicon 4H13030847

R402 15k 0323 Diode -Silicone 4H13030621

R403 24k 0331 Diode -Zener 4H13034197

R404

lOOk

0401 Diode -Zener 4H13034398

R405 27k 0431 Diode -Silicon 4H13030847

R406 10k D432 Diode -Zener 5H13031931

R407 33k 0441 Diode -Silicon 4H13030621

R408 560 ohm 0501 Diode -Silicon 4H13030847

R421

180k 0502 Diode -Silicon 4H13030847

R422 120k 0511 Diode -Silicon 4H13030847

R424 270k

0512

Diode -Silicon 4H13030847

R426 330k 0513 Diode -Silicon 4H13030621

R427

lOOk

0521 Diode -Silicon 4H13031168

R428 430 ohm 0522 Diode -Zener 4H13034499

R429

lk

0523

Diode -Silicon 5H13034979

R431

12k

0524

Diode -Silicon 4H13034189

R432 10k

0525

Diode -Silicon 4H13034189

R433 150 ohm

0526

Diode -Silicon 4H13041487

R434 5.6 ohm 0601 Diode -Zener 4H13034233

R435 6.8k

R436

lk

SEMICONDUCTORS -TRANSISTORS

R437 4.7 ohm

R438 330 ohm

TS10l

Transistor -NPN 4H13042239

R501

180k TS102 Transistor -PNP 4H13044197

Commodore Part Numbers are not available

at

this time.

8

1901 SERVICE MANUAL

REPLACEMENT PARTS (Continued)

SEMICONDUCTORS -TRANSISTORS RESISTORS (unless specified, all are 5%,

V4W)

T8103

Transistor -NPN 4H13044196

R321

1k (BM7513), (BM7523)

T8305 Transistor -NPN 4H13044246

R321

820 ohm (7BM613), (7BM623)

T8321 Transistor -NPN (BM7513), BF422 R322 680 ohm

(BM7523) R323 1k

T8321 Transistor -NPN (7BM613), 4H13041589 R324 47k

(7BM623) R325 18k

T8322 Transistor -NPN 4H13044246 R326 2.2k

T8341 Transistor -PNP 4H13044197 R327 1k

T8401 Transistor -PNP 4H13044197 R329 330k

T8402 Transistor -NPN 4H13044196 R330 120 ohm

T8421 Transistor -

PN

P 4H13044358 R337 33k 4H11150482

T8422

Transistor -NPN 4H13044196 R338 33k 4H11150482

T8431 Transistor -NPN 5H13044349

T8432 Transistor -PNP 4H13044283 SEMICONDUCTORS -DIODES

T8441 Transistor -NPN 4H13044196

T8442 Transistor -NPN 4H13044196

T8443 Transistor -PNP 4H13044197 0321 Diode -Zener (BM7513), (BM7523) 4H13034278

T8501 Transistor -PNP 4H13044358 0321 Diode -Zener (7BM613), (7BM623) 4H13030861

T8511 Transistor -PNP 4H13044197 0322 Diode -8ilicon 4H13030847

T8512 Transistor -PNP 4H13044197 0323 Diode -8ilicon 4H13030621

T8513 Transistor -PNP 4H13041041

T8521 Transistor -NPN 4H13042241 SEMICONDUCTORS -TRANSISTORS

SEMICONDUCTORS -INTEGRATED CIRCUITS T8321 Transistor -NPN (BM7513), (BM7523) BF422

T8321 Transistor -NPN (7BM613), (7BM623) 4H13041589

IC601 5H20984997 T8322 Transistor -NPN 4H13044246

MISCELLANEOUS LED BOARD

8 CRT -Amber (7BM623), M31344LAPD

0106

Diode -LED/Green (7BM613), (BM7513)

4H

13042242

(BM7523) (BM7513)

8 CRT -Green (7BM613), M31344GRPD

0106

Diode -LED/Amber (7BM623), 4H13032341

(BM7513) (BM7523)

8 CRT -80cket 4H25570189

8 U102 Deflection Yoke 4H15010188 CABINET PARTS

8 VL

101

Fuse -.5A, 250V (7BM613), 4H25361006

(7BM623) Block RetaineF f/AC Power Cord 4H46691447

8 VL101 Fuse -.5A, 250V (BM7513), 4H2531 0059 Cabinet (7BM613) 4H43070323

(BM7523) Cabinet (7BM623) 4H43070327

8 VL102 Fuse -2A, 250V 4H2531 0045 Cabinet (BM7513) 4H3070305

8 Fuse -Thermal 4H25220007 Cabinet (BM7523) 4H43070304

80cket -Jack 4H26720241 Adjusting 8pindle flVert. Hold 4H53591695

Plug -Micro -Connector 4H26520235 Horiz. Width & Vert.

8ize

(BM7513), (BM7523)

(3

used)

Din Plug (7BM613), (7BM623) 4H26440026 Adjusting Spindle -Horiz. Phase 4H53570797

8 8K1 Power 8witch -On/Off 4H27011161 Knob -Volume, Contrast, Brightness 4H41 023595

(3

used)

CAPACITORS (unless specified, all are ceramic, 50V) Knob -Push Button (7BM613), 4H41024148

(7BM623)

C321

22nF.,63V

Knobs

(2

used) (7BM613), (7BM623) 4H41310239

C322 100nF., 100V Foot f/Cabinet (7BM613), (7BM623) 4H46240788

C323 100nF., 100V 4H12421678 Foot f/Cabinet (BM7513), (BM7523) 4H46240699

C331

100nF.,500V

8

AC

Power

8upply

Cord 4H32110109

Owner's Manual (BM7513), (BM7523) 4H73650736

Owner's Manual (7BM613), (7BM623) IB46060001

Commodore Part Numbers are not available at this time.

-

9

1901 SERVICE MANUAL

MAIN PANEL ASSEMBLV

~

G)----t-~_~------=~>";

i

:

~

®S

~

Bottom

View

Note: See page 6

for

waveforms

corresponding

to

respective

waveform

numbers.

10

1901 SERVICE MANUAL

MAIN

PANEL

ASSEMBL

V

-

I

I~

_

___

_

__

---(-,.,.

__

-(~l")--(;;;";HU;n}---

Top

View

-

11

SCHEMATICS NOTES

UNLESS OTHERWISE SPECIFIED

1.

ALL CAPACITORS

ARE

IN

MFD. 50V UNLESS OTHERWISE SPECIFIED.

2.

ALL RESISTORS ARE % WATT, 50

/0

UNLESS OTHERWISE SPECIFIED.

3.

ARROWS

ON

CONTROLS INDICATE DIRECTION OF CLOCK-WISE ROTATION.

4.

RESISTANCE SHOWN

(COILS/TRANSFORMERS)

ARE

IN-CIRCUIT

MEASUREMENTS.

5.

SCHEMATIC SYMBOLS @ ARE WAVEFORM TEST POINTS.

6.

C613

IS

USED

FOR

FACTORY ADJUSTMENT PURPOSES AND MAY NOT BE IN-

CLUDED

IN

SOME RECEIVERS.

7.

1nF. =

.001t,tF.,

10nF. =

.01t,tF.,

100nF. =

.1t,tF.

WARNING

Critical components having special

safety

characteristics

are

identified

with

an

S by

the

Ref. No. in

the

parts list and enclosed

within

a broken line* along

with

the

safety

symbol

A

on

the

schematics or exploded

views.

Use

of

substitute replacement parts

which

do

not

have

the

same

specified safety characteristics

may

create shock, fire,

or

other

hazards.

Under no circumstances should

the

original design be

modified

or altered

without

written

permission

from

the

N.A.P. Consumer

Electronics Corp. NAPCEC assumes no liability, express or

implied, arising

out

of

any unauthorized

modification

of

design.

Servicer assumes all liability.

*Broken

line:

_.-

-

_._._-

~.-.-

VL101

r1l1·~·'

lc110

I!

~

...

;~O~

TO.SA

I1201/

.......

60Hz

A

-----,

I

CD·

5K

1

~r_~sv;("';,,-'-I-'-"V'-_'-

___

r-_T

__

r-

__

-.-

____

..

{11V)

, +1:2

(lOV)

~--------'+20

47n

8\

/"

!

lT220

n

~

j

e-

J_

I~

._---_.

- I

___

~

- --

.-=T.

- -

_.

- .

I

--~

C52J/R525

124V 1

~

_______

+25

I.

.,

W

2AT

INTENSITY

VIDE:O

HORIZONTAl

C

10.91

lOn

"J

+12

"

'.J

~Rl.06

•

Cl

0

'!

Cl0.8

~

I!~O~

10nT

~lR'07

_

~

1

C521/R525

(-90V

1

~-100

0525/C527

151VI

~+60

0524/C525

(500VI

~+550

0523/C524

~

SAFETY

RESISTOR

-lCJ-

5FR25-

0.1251'1

5j/,

~

CR37 -0.251'1

5-10"-

~~

CERAMIC-

~~

FLAT-FOIL

~[}--

ELECTROLYTIC

+20

~------------:'~~

SCHEMATIC DIAGRAM

SAFETY

RESISTOR

~

SFR

25 0.2SW

Sj/,

~

SFR

)0

0.2SW

5

-10j/,

11

e",

16

V

f

=25\1

~

MR

25

1-2j/,

9=4011

M

=63V

--I~

CERAMIC

J =

may

r = 25011

--I~

FLAT

FOIL

u=40011

II

=50011

--{]~

ELECT

ROL

YTIC

~"I/

...

VIP"

24111

()

-J?~-

MAX MIN

• e

16V

25V

63V

-+-

AC

100\1

250v

----

DC

w

600v

OSCILLQGRAMS.

(PM55191

GENERATOR

ON

GREY SCALE AND

VIDEO OUTPUT

ADJUST

ON

o.t.Ypp

"AX

1

1901 SERVICE MANUAL

04S

v--J\

AI

8

N1

v

L.

30V

_

5V-

12.5V

+60

R327..::.:

C322

I100n

.

.,

0321

5321

0-

L6

LV

+12

•

-100

II

:iJ.

A!;~.s:~~·

I :

~~---7------------~

I :

, 6 I

.I.

••

w

I :

I'- 1e527

, 14

1-J

7

~--

c:bc5r

-1e522

~

It.7,IJ

.f

T

"~

.f

+12

·,2

~------------

..

---

+60

+12

+,'

TC!jJ

'S"'i

C528

I

lOn

+60

,

1c530

11on .

••

J

-100

,

1C531

ton

+25

,

+20

,

1C52J

I22n

.,"

C529

2J,J7

eej

'>;"1

A.

l·a

:1

"

'I

I,

,-!..l

12

(:

commodore

COM

P

UTERS

DOCUMENT

RE

GISTRATION

Date:

Manual

Name

:

Part

Number:

Issue Date:

The

return

of

this

information

is essential

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If

necessary,

docu-

ment

updates

and

changes

will

be

distributed

to

registered

persons.

Subsequent

versions

and

editions

of

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If

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docu-

ment

updates

and

changes

will

be

distributed

to

registered

persons.

Subsequent

versions

and

editions

of

this

document

must

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purchased.

Name:

________

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Company:

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State:

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COMMODORE

BUSINESS

MACHINES

C-2654

West

Chester,

PA

19380

PLACE

STAMP

HERE

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