Commodore Computers PC 1901 Service Manual

SERVICE MANUAL

PC

1901

MONOCHROME MONITOR

APRIL, 1987

PN-314970-01

Commodore

1200

Wilson Drive,

Commodore makes no expressed or implied ranties herein. The information is made available solely on an as is basis, and accuracy liable in tained herein. The listing ment a recommendation, quality Reproduction or use of prohibited.

This manual contains of

this

publication transmitted photocopying, recording or otherwise, sion

of

Commodore Electronics Limited.

with

for

connection

part herein does

or suitability

editorial or pictorial

may

in any

Business

West

Chester, Pennsylvania

regard

to

the

is

with

any consequential or incidental damages

with

copyrighted

be reproduced, stored in a retrieval

form

by

Commodore Electronics Limited.

entire risk

the user. Commodore shall

the

use

of

not

warranty

of

such replacement part.

without

content,

and proprietary

or

by

any

Machines,

information

as

to

quality

of

the

information

any available replace-

constitute

expressed permission,

means, electronic, mechanical,

without

in any case

or guaranty as

in any

the prior

Inc.

19380

war-

contained

and

not

be

con-

to

matter

information.

is

system,

written

U.S.A.

No

part

permis-

or

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

-------

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

IMPORTANT SAFETY NOTICE

1901 SERVICE MANUAL

--

Proper service and repair is service procedures recommended methods specially designed

It

is carefully read in order ists

that evaluate and advise the such broad evaluation. Accordingly, a servicer mended tion

of

performing service operations. Some

for

important

that

these CAUTIONS and NOTICES

possible hazardous consequences

by

of

the

to

note

improper service methods

the

NAPCEC

equipment

must

important

by

the

purpose. The special

that

this

manual contains various CAUTIONS and NOTICES

to

minimize

service trade

first

will

be jeopardized

the

may

satisfy

to

the

NAPCEC and described in

risk

of

damage the equipment.

ARE

NOT EXHAUSTIVE. NAPCEC could

of

all conceivable

of

each

himself

by

WARNING

Critical identified within schematics or exploded

components

with

an S by

a broken line * along

having special

the Ref. No.

safe, reliable operation

this

of

these service operations require

tools

should be used

personal injury

way.

Consequently, NAPCEC has

who

uses a service procedure or tool

thoroughly

the

service

in

with

the

views.

to

service personnel. The

It

ways

safety

the

in

which

that

neither his

method

parts list and enclosed

safety

selected.

characteristics are

symbol A on

of

all NAPCEC Equipment. The

service manual are when

also is

and as recommended.

which

important

not

service

safety

the

might

not

which nor

the

possibly

undertaken any

the

effective

use

should

possibility

to

understand

be done or

is

not

safe opera-

of

tools

know,

recom-

be

ex-

of

Use

of

substitute replacement parts specified hazards.

Under no circumstances should the original design be modified or altered Electronics Corp. NAPCEC assumes no liability, express or implied, arising Servicer assumes all liability.

safety

without

characteristics may create shock, fire, or other

written

out

of

permission from the N.A.P. Consumer

any unauthorized

which

do

modification

not

have the same

of

design.

* Broken line:

... _ .....

_._

...

_._------

1901 SERVICE MANUAL

TABLE OF

TITLE

SPECIFICATIONS

SAFETY

CIRCUIT

ADJUSTMENTS.

CHASSIS

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

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

PARTS

PCB

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

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

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

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

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

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

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

CONTENTS

PAGE

.

..

2

4

5

7

10

SCHEMATIC

DIAGRAM.

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

CAUTION

USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING.

..

12

1901 SERVICE MANUAL

.-

PC

1901

MONOCHROME MONITOR

(NAP - 7BM613)

-

SPECIFICATIONS

Picture Tube: 12" measured diagonally with

glare reducing surface treatment Deflection Angle: 90 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)

0

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

* Subject to Modification

1,000 lines (7BM613, 7BM623)

11.1"0

x 10.9"H

1

1901 SERVICE MANUAL

NAPCEC SAFETY GUIDELINES FOR THE

PROFESSIONAL SERVICE TECHNICIAN

Safety Checks

A

fter

the

original service

rected, a complete

to

Be sure areas vicer could Be sure

Fire

and Shock Hazard

1.

Be as component on from

2. Never release a repaired receiver unless all protective covers, been

3.

Soldering to splashes, sharp solder points, ched leads, or damaged insulation (including ac cord). and all

4.

Check components or deterioration and replace original

5.

No ing Lead or

6.

Critical characteristics Ref. No. in a on the shock,

7.

When separate Failure may may

8.

Many wide

check where may be

edges

broken

you

have

unknowingly

to

check

sure all

way

as

those

chassis

the

strain reliefs, and

installed

locate

Be

other

across-the-line

layout, lead or tube

or a

tension

components

line*

the

schematics.

same

fire or

servicing

isolation

to

expose

cause

receivers

pin on

safety

over

have

left

all

components to

avoid

shorts.

service

devices

according

and

possible

certain

loose

for

lead

component

resistor

around

must

be avoided. are

the

parts

along

safety

other

use a separate

you

to

damage

use a polarized line

the

problem

check

the

worked.

an

unsafe

passed on

of

the

This is especially

which

shop.

such

wiring

cold

to

remove

foreign

components

physical

length

rated

protruding

having

identified

list

with

Replacement

characteristics

hazards.

any

receiver,

transformer

possible

to

plug).

should

entire

Some

condition,

to

following:

are

positioned

possibility

are

transported

as

insulators,

other

to

the

must

solder

frayed

loose

particles.

evidence

if

necessary. Follow

and dress.

should

at 1 watt

with and the

safety

isolation

shock

servicing

Defeating

has been cor-

be made.

set,

not

just

of

hardware

original design.

be

joints,

solder

of

touch

metal

special

an S

enclosed

symbol

parts

may

always

for

the

transformer

hazard, and

instruments.

this

ser-

which

customer.

in

such

adjacent

important

to

and

barriers,

have

inspected

solder

leads, pin-

balls

and

other

damage

a receiv-

or more. surfaces

safety by within

without

create

use a

chassis.

cord

(one

safety

the

device vicer

not never

9.

After an the cabinet.

(with handles, to

* Broken line:

may

and

the

incorporate

be used.

re-assembly

ac

leakage

line

cord

Also,

knobs

screws,

operate

without

-.

create a

user.

the

test

to

all

check

removed),

etc.

- . - -

potential

Extension

polarizing

of

the

set,

or

resistance

exposed

all

metal

antenna

to

be sure

danger

--

hazard

cords

feature

always

metal

control

of

electrical

to

which

test

parts

terminals,

the

set

the

ser-

do

should

perform

from

of

the

shafts

is safe

shock.

Implosion

1. All picture tubes used in current model receivers are equipped Care should worn, Avoid picture

2. Use

X-radiation

1.

2.

3.

4.

only

manufacturer.

Be

sure service radiation. receivers are voltage must

be

tory

recommended

To

avoid electrical specified It

is essential available calibration periodically When there

is no

lem.

High manufacturer's timum serviced, down

while

be

certain

with

an integral implosion system.

always

whenever

scratching

tube

during

replacement

procedures

personnel

Potential

circuits.

exercised

possible

shock,

anode

at

all of

against a reference

the

HV

possibility

voltage

performance.

the

monitoring

that

be used, and handling or

and

the

picture

The

is

exposure

only

connectors

that

the

times

this

meter

circuitry

should

rated

brightness

the

any

otherwise

installation.

tubes

as

instructions

cover

sources

level.

an accurate

HV

the

tube

basic

to

keep

the

service

should

is

operating

of

an

always

value-no

Every

time a color

should

the

HV

does

of

precaution

the

to

must

X-radiation

safety

picture

damaging

specified

subject

X-rays and

HB

X-radiation manufacturer's

technician

HV

standard.

be

higher-for

be run

with a meter

not

glasses

tube.

by

to

all

your of in

the

high

which

at

the

fac-

be used.

meter. The

be

checked

properly

prob-

kept

at

set

up

exceed

the

TV

and

has

the op-

and

the

X-

is

to

2

1901 SERVICE MANUAL

-

specified value and We

suggest

cians

review regulation servicing procedure, and the reason dent

routine be clearly understood

It

is

important

HV

meter. reading be invoice, cern

for

5.

When measurements excessive by

means

acceptable

operate locate

6.

New

type

to

withstand creating recommended is

to

be used chassis be tubes permanently test in any X-radiation.

7.

It to

8.

Most gency rising failure understood especially inoperative normally.

Leakage

1.

Unplug between

2.

Turn

3.

Measure jumpered of and part has a return path should megohms. have a return must ac line cord.

designed

fixture

these

other

is essential

avoid

TV

"Hold

to

Current

on

the

receiver, such as

control

be

that

test

are

It

which

the

troubleshooting

high

of a Variac

limits

the

chassis

the

cause

picture tubes are specifically designed

undesirable

equipped

is advisable. The CRT

new

sets should never be replaced

types,

a possible receivers

Down"

excessive

mode.

by

since

as long as

the

ac

the

power the ac plug and all

shafts.

be

between

When

infinity.

that

it

is regulated correctly.

you

and

procedures so

always

to is

recorded

will

customers'

in a receiver

voltage,

higher operating

that

with

for

connected

as

to

use

These

all

many

Cold

line cord and

two

resistance

path

checked

use an recommended

while

of

contain

technicians

Check

prongs

the

Remove

accurate

on

demonstrate a proper

safety.

reduce

to

troubleshooting.

longer

the

excessive

X-radiation.

any

shop

the

with

this

service.

HV

this

may

the

specified

X-radiation

circuit

levels in

various

hold

the

switch.

exposed

screw

When

to

the

1

exposed

to

the

your

service

that

as a

each

and

making

with a problem

the

bring

than

voltages

test

fixture

new

higher

one

of

the Addition

meter

result in excessive

problem.

some

type

to

prevent

the

presence

circuits

servicing

down

receiver

connect a jumper

of

the

plug.

value

the

chassis, the

between

heads,

exposed

chassis,

megohm

metal

jumper

techni-

HV

and

standard

for

this pru-

by

everyone.

and reliable

that

the

customers'

line

voltage

the

HV

Do

necessary

HV.

without

It

is

strongly

voltage

new

to

the

types

picture

of

HV

should

circuits

performs

cabinet

antennas

metallic

the

reading and does

the

reading

from

HV

con-

test

of

into

not

to

which

type

of shop used

with

tube

emer-

from

of

be

them,

are

the

parts

5.2 not

the

F

O.151J

TO INSTRUMENTS

EXPOSED

METAL

Leakage

1.

Do test. receiver

2.

Connect leled posed ground

3.

Use an ac ohms/volt across

4.

The

0.75 used

a

not outside of and customer.

5. Repeat reversed. (Note: when the

Picture The

is

the chassis is specially emissions. For continued X-radiation replacement including tronics

Parts Many

television characteristics. These evident tion using voltage, part characteristics replacement create

.-£-~--~~--~~

PARTS

Current

not

use

an

Plug

directly

a 1.

by

a 0.1 5uF.

metallic

such

as a

sensitivity

the

resistor.

potential

volts.

to

exceed

shock

re-checked

polarizing

Tube

primary

picture

suffix

Corp. (NAPCEC)

Replacement

electrical

from

afforded

replacement

wattage,

which

shock,

A leakage

make

0.5

the

limits

hazard. The receiver should be repaired

the

above

a polarized

Replacement

source

tube.

must

letter, or an N.A.P.

and

sets

visual

by

them

does

as

part

fire or

Hot

Check

isolation

the

completely

into

the

5k

ohm,

cabinet

voltmeter

at

this

milliamps.

feature

of The constructed

be

mechanical

have

inspection

components

etc.

not

the

shown

10

capacitor

water

to

any

point

test;

specified, there is a possibility

before

procedure

An

ac

plug

is used.

of

X-radiation

picture

the

same

approved

special

characteristics

necessarily

The use

have

NAPCEC

in

this

other

WATER (EARTH

transformer

ac

outlet.

watt

between

part

and a

pipe, as

with

measure

should

current

leakage

If a measurement

returning

with

adapter

the

plug.)

tube

to

type

parts

nor

rated

the

service manual

hazards.

PIPE

re-assembled

resistor

good

shown

at

least

the

not

tester

current

the

is

necessary

Do

not

in

this

utilized

limit

X-radiation protection, as

the

Consumer

type.

in NAPCEC

safety-related

are

can

the

be

obtained

for

of a substitute

same

recommended

GROUND)

for

this

paral-

each ex-

earth

above.

5000

potential

exceed

may

be

must

is

it

to

the

ac plug

defeat

television

in

this

the

original,

Elec-

often

not

protec-

by

higher

safety

may

3

1901 SERVICE MANUAL

-

CIRCUIT DESCRIPTION

This monitor graphic display unit for the home and personal computers. The screen is anti-reflecting which means that the legibility of the image monitor has composite video signal input.

The monitor operates The Power Transformer and CRT are mounted internally 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 Control and Brightness Control are mounted panel and extend through the cabinet front. The circuit adjustments are mounted to the main panel.

Power Supply

120 volt, 60Hz receiver alternating current only. Never connect power cord to a supply having a different frequency or voltage.

Overload Protection This receiver incorporates a a 2 amp fuse tection to the chassis against certain electrical over-

loads.

can

be

used

as

on

a supply of 120V, 60Hz

ac

operation. The

is

designed for operation

.S

in

the

ac

circuit. These fuses provide pro-

an

alphanumeric and

is

extremely good. The

on

the main

ac

section of this

on

120 volt, 60Hz

amp Slow-Blow fuse and

ac.

ADJUSTMENTS

B

+

Adjust Connect dc voltmeter to the collector of allow receiver and test equipment to warm up for minutes. Using a non-metallic tool, adjust obtain

Focus (R336) Adjust Focus Control for best overall detail portion of the picture.

Horizontal Oscillator Short zontal stability of picture. Remove short between C503 and R544.

Vertical Size (R425) Adjust the Vertical Size control (R425) vertically.

Horizontal Size (S523) Adjust horizontal size to fill up screen.

Vertical Linearity (R423) Adjust vertical linearity control for equal spacing of

horizontal lines

screen.

(R106)

11

Vdc ± 1 %

CS03

and R544 to ground. Adjust R513 for hori-

on

voltmeter.

Adjustment

at

the upper portion of the center of the

(R513)

to

TS101

in

fill the screen

and

20

R106

to

the center

-

5523

Horiz.

5ize-~;;;;:~

---'---Video

U102

~--IPo'wer

In

Deflection

Yoke

Transformer

-

R406

Vert. Hold

Adjustment

Location - Rear View

4

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

1901 SERVICE MANUAL

Chassis Removal

1.

Remove

cabinet back

2.

Lay cabinet face down picture tube and cabinet finish.

3.

Chassis Removal - Slide printed circuit board

assembly

vicing.

4.

Place chassis

tion the monitor remains stable

5.

Disconnect the picture tube socket

anode lead

6.

Loosen 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 high voltage anode

7.

To cedure.

8.

Note: Backcover Replacement - Printed Circuit Board must slide into proper tracks in backcover.

six

(6)

screws, four

to

cabinet front.

to

rear

as

on

the heat sink of

at

picture tube.

clamp screw securing deflection yoke

to

ground only.

replace components, reserve the above pro-

(4)

of which

on

a soft material

far

as

leads will allow for

on

are

to

TS1

01.

In

the work bench.

and

high voltage

securing

protect

ser-

this

posi-

to

pic-

Picture Tube Removal

1.

2.

3.

4.

5.

6.

CRT Board

Disconnect from picture tube. Loosen clamp screw securing deflection yoke and slide yoke off neck of picture tube. Lay cabinet face down to

scratch or

on

cabinet. Slide printed circuit board assembly out of track. Remove screws from each of four ing picture tube neck of tube. Using goggles and lift from cabinet. Do not grasp neck tube at any time. To

install picture tube, reverse the preceding steps. Exercise caution not

HV

anode lead and picture tube socket

on

a soft material

mar

the face of the picture tube

(4)

in

place. Slip mounting wire over

and

gloves, reach under face of tube

to

scratch

face

so

brackets hold-

of

of picture tube.

as

not

or

finish

picture

-

--,~-

Power

--~~.~--

SK1

On/Off

T110

Power Transformer

Switch

:

'

5

MEASUREMENTS

1901 SERVICE MANUAL

-

Important Read these instructions carefully and observe the conditions noted when taking voltage readings or observing waveforms.

Picture tube high voltage anode may have a potential

all

10kV. Observe vicing the chassis. handling the picture tube.

Voltage Measurement Conditions Unless Otherwise Specified

1.

Voltages measured meter.

2.

AC

power source 120V, 60Hz line.

3.

Voltage readings not tern generator (PM5519)

4.

Brightness control set control to maximum.

5.

Voltage values shown are average readings. Variations may tolerances.

high voltage precautions when serUse

safety goggles

to

chassis using a digital volt-

in

brackets taken using a pat-

as

at

minimum, and contrast

be

observed due to normal production

and

gloves when

a signal source.

Waveforms

Special Voltage Measurement Conditions

Picture tube anode voltage measured with VTVM high voltage probe current.

Waveform Measurement Conditions

1.

Waveforms taken using a pattern generator con-

nected

2.

The video output signal of the generator adjusted to

1 volt.

3.

Brightness control and contrast control set at maximum.

General Schematic Notes - See matic Diagram

at

line voltage of

to

the input plug of the monitor.

120

volts

"Notes"

G)~I

at

100llA

beam

on

Sche-

40V

OV--

-

®"v-n

0

4v_1/\12v

e

HI23v

ov--

I

10V

G

-2SV-J

/'\

L.J

iI

I

22SV

l

® ®

0

@

1/lIloV

ov--

~I23v

ov-

ov_J~I4v

ov

0

ov_HI23v

(0

OV

__

l/l

J\JLI

I4v

l1V

'_.

0

ov_V'1Isv

6

-

TO

ALWAYS

Critical

components identified enclosed

A

Use same specified or

other

on

the

of

substitute

with

within

schematics

hazards.

ENSURE

USE

having special

an S

by

the

Ref.

a broken

safety

line*

or

exploded

replacement

characteristics

--

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

1901 SERVICE MANUAL

REPLACEMENT PARTS LIST

OPTIMUM

GENUINE

safety

characteristics

No.

in

the

along

with

the

views.

parts

which

do

may

create

PERFORMANCE

FACTORY

WARNING

parts

safety

not

shock,

list

symbol

have

are

and

the

fire,

Under modified N.A.P. liability,

modification

*

AND

REPLACEMENT

no

circumstances

or

Broken

altered

Consumer

express

of

line: _ . _ . _ . _ .

without

Electronics

or

implied,

design.

RELIABILITY

should

written

arising

Servicer

the

Corp.

out

assumes

PARTS

original

permission

NAPCEC

of

assumes

any

unauthorized

all

liability.

design

from

be

the

no

-

CAPACITORS (All Ceramic, 50V unless otherwise specified)

C101

S

C102

S

C103

S

C104 C105 C106 C107

C110

S

C111

S

C112

S

C301 C302 C303 C304 C305 C321 C322 C323 C331 C341 C342 C343 C401 C402 C403 C404 C405 C406 C421 C422 C423 C424 C431 C432 C433 C434 C435 C501 C502 C503 C504

C505 C506 C507 C508

C511

2.2nF., 100V, Cer. Disc.

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

2.2nF., 100V, Cer. Disc. 4H12231989 3300J.'F., 100pF., 50V, Cer. Disc. 4H12232156 10nF., 63V, Electrolytic 330nF., 16V, Electrolytic

47nF., 125V,

2.2nF., 125V,

2.2nF., 63V, Electrolytic 470nF., 100V, Cer. Disc. 22nF., 63V, Cer. Disc. 100nF., 25V, Electrolytic 27pF., 100V, Cer. Disc. 22nF., 63V, Cer. Disc. 100nF., 100V, Cer. Disc. 100nF., 100V, Cer. Disc. 100nF., 400V, Cer. Disc. 1 nF., 63V, Electrolytic 15nF., 63V, Cer. Disc. 10nF., 63V, Electrolytic 10nF., 100V, Cer. Disc. 10nF., 100V, Cer. Disc.

4.7nF., 100V, Cer. Disc.

3.3, 100V, Cer. Disc. 270pF., 100V, Cer. Disc. 10nF., 400V, Cer. Disc. 220nF., 100V, Cer. Disc. 56nF., 100V, Cer. Disc. 820pF., 220pF., 100V, Cer. Disc. 270pF., 100V, Cer. Disc. 100pF., 50V, Cer. Disc. 100nF., 25V, Electrolytic 220nF., 25V, Electrolytic

4.7nF., 100V, Electrolytic 2nF, 400V, Cer. Disc. 680pF., 100V, Cer. Disc. 15nF., 400V, Cer. Disc. 560pF., 500V, Cer. Disc.

4.7nF., 100V, Cer. Disc. 10nF., 100V, Cer. Disc.

4.7nF., 270pF., 100V, Cer. Disc.

1.5nF., 100V, Cer. Disc.

25V, Electrolytic 4H12421466

50V,

63V,

AC

AC AC

Cer. Disc.

Electrolytic

4H12141348 4H12232194 4H12232194

4H12421678

4H12232157

4H12232156

CAPACITORS (Continued)

C512 1.5nF., 100V, Cer. Disc. C513 5.6nF., 100V, Polyester C514 10nF., 250V, Cer. Disc. C515 100nF., 250V, Cer. Disc. C521 C522 C523 22nF., 63V, Cer. Disc. C524 C525 C526 C527 C528 C531 C602 C603 22"F., 16V, Electrolytic C604 10nF., 100V, Cer. Disc.

COILS & TRANSFORMERS

S321 S523 Coil - Horizontal Width 4H15751717 S524 Coil - Linearity T110

S S

T521

T522 Transformer - Line Output

S

CONTROLS & SWITCHES

SK1

S

R106 R303 R331 R332 R336 2 Meg., Focus R406 R423 47k, Vertical Linearity R425 330k, Vertical Size R513

RESISTORS

R101 R102 R103 1.2k

47nF.,

25V,

47nF., 25V, Electrolytic 100nF., 500V, Cer. Disc.

22nF., 100V, Electrolytic 560pF., 100V, Cer. Disc.

4.7J.'F., 13nF., 400V, Polyester 10nF., 500V, Foil 4H12142191 22nF., 63V, Cer. Disc.

6.8"F., Coil - Choke

Transformer - Power 4H14630509 Transformer - Horiz. Output 4H15050051

Power Switch - On/Off 4H27611161

4.7k. B + Adjust 470 ohm, Contrast

1 Meg., Brightness Pre-set

470k, Brightness 4H10020122

10k, Vertical Hold

330 ohm, Horizontal Hold

(unless

150 ohm 1k

Electrolytic

160V, Electrolytic 4H12440387

otherwise

specified,

all

are

4H12150625

4H12142192

4H12440189

4H15751998 4H15751914

4H14010264

4H1 4H10020121 4H10010103

4H10120727 4H10110547 4H10010076 4H10110548 4H

1 0020054

5%,

001

0236

1/4W)

Commodore Part Numbers are not available

at

this time.

7

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

1901 SERVICE MANUAL

REPLACEMENT PARTS LIST (Continued)

RESISTORS (Continued)

R104 27k Rl05 Rl07 Rl08 R301 R302 680 ohm R304 47 ohm R305 18k R306 R307 100 ohm R308 100 ohm

R309 470 ohm R310 R311 R312 68k R313 R314 75 ohm R316 68 ohm R317 68 ohm R321 R321 R322 680 ohm R323 R324 47k R325 18k R326 2.2k R327 1 R328 R329 R330 120 ohm R333 390k R335 R337 R338 33k R341 R342 R343 1k R344 R345 27k R401 R402 R403 24k R404 R405 27k R406 10k R407 33k R408 560 ohm R421 R422 120k R424 270k R426 R427 R428 430 ohm R429 R431 R432 10k R433 150 ohm R434 R435 R436 R437 R438 R501

15k 15k lk 100 ohm

4.7k

100k lk

4.3k

lk

(BM7513), (BM7523)

820 ohm (7BM613), (7BM623)

lk

k,

V4

W,

Metal Film

120 ohm,

330k

270k 33k

1.5 Meg.

2.2k lk

6.8k 15k

lOOk

180k

330k

lOOk lk

12k

5.6 ohm

6.8k lk

4.7 ohm 330 ohm 180k

112W

5Hl1654403 4Hll043083

4Hll150482 4Hll150482

RESISTORS (Continued)

R502 R504 10kR50512k R506 2.2k R511 R512 2.7k R514 2.2k R515 8.2k, Metal Film R516 8.2k R517 6.8k, Metal Film R518 R519 R520 1.2k R522 220 ohm R523 R524 1.8 ohm R525 390 ohm

S R526 1

R527 5.6 ohm,

S S R528 100 ohm,

R529 470 ohm R601 R602 R603 R604 R605 1.2k R606 R607 470 ohm R608 R609 120 ohm

150k

560 ohm

18k

3.9k

8.2 ohm,

k,

V.

W,

lk lk lk lk

l.2k

560 ohm

4H11652918 4H11652865 4Hl1653064

%W, Safety Resistor 4H1130506

Safety Resistor

%

W,

Safety Resistor

V4W,

Safety Resistor

4H11130561 41-111130502 4H11130535

SEMICONDUCTORS - DIODES

0101 Diode - Bridge Rectifier 4H13031174

S S 0102 Diode - Bridge Rectifier S 0103 Diode - Bridge Rectifier 4H13031173

0104 Diode - Bridge Rectifier 4H13031173

S

0105 Diode - Zener 4H13034167 0321 Diode - Zener (BM7513), (BM7523) 4H13034278 0321 0322 Diode - Silicon 4H13030847 0323 Diode - Silicone 0331 Diode - Zener 0401 0431 Diode - Silicon 4H13030847 D432 0441 Diode - Silicon 4H13030621 0501 Diode - Silicon 0502 Diode - Silicon 0511 0512 0513 Diode - Silicon 0521 Diode - Silicon 0522 Diode - Zener 4H13034499 0523 0524 0525 0526 0601 Diode - Zener

..

Zener (7BM613), (7BM623)

Diode

Diode - Zener 4H13034398 Diode - Zener

Diode - Silicon 4H13030847 Diode - Silicon

Diode - Silicon 5H13034979 Diode - Silicon 4H13034189 Diode - Silicon 4H13034189 Diode - Silicon

4H13031174

4H13030861 4H13030621

4H13034197

5H13031931 4H13030847

4H13030847 4H13030847

4H13030621 4H13031168

4H13041487 4H13034233

SEMICONDUCTORS - TRANSISTORS

TS10l TS102

Transistor - NPN 4H13042239 Transistor - PNP 4H13044197

Commodore Part Numbers are not available

at

this time.

8

1901 SERVICE MANUAL

REPLACEMENT PARTS (Continued)

SEMICONDUCTORS -TRANSISTORS

T8103 T8305 Transistor - NPN 4H13044246 T8321 Transistor - NPN (BM7513), BF422

T8321 Transistor - NPN (7BM613), 4H13041589 T8322 Transistor - NPN 4H13044246

T8341 Transistor - PNP 4H13044197

T8401 Transistor - PNP 4H13044197 T8402 Transistor - NPN T8421 T8422 T8431 Transistor - NPN T8432 Transistor - PNP 4H13044283 T8441 Transistor - NPN T8442 Transistor - NPN

T8443 T8501 T8511 T8512 Transistor - PNP T8513 Transistor - PNP T8521

Transistor - NPN 4H13044196

(BM7523) (7BM623)

PN

Transistor Transistor - NPN 4H13044196

Transistor - PNP 4H13044197 Transistor - PNP 4H13044358 Transistor - PNP

Transistor - NPN 4H13042241

P 4H13044358

4H13044196

5H13044349

4H13044196 4H13044196

4H13044197 4H13044197 4H13041041

SEMICONDUCTORS - INTEGRATED CIRCUITS

IC601

5H20984997

MISCELLANEOUS

8 8 8

U102

8

VL

8

VL101

8

VL102

8

8K1

8

CRT - Amber (7BM623),

(BM7523)

CRT - Green (7BM613),

(BM7513) CRT - 80cket Deflection Yoke Fuse - .5A, 250V (7BM613),

101

(7BM623) Fuse - .5A, 250V (BM7513), 4H2531 0059

(BM7523) Fuse - 2A, 250V Fuse - Thermal 80cket - Jack Plug - Micro - Connector

(BM7513), (BM7523) Din Plug (7BM613), (7BM623) Power 8witch - On/Off

M31344LAPD M31344GRPD

4H25570189 4H15010188 4H25361006

4H2531 0045 4H25220007 4H26720241 4H26520235

4H26440026

4H27011161

CAPACITORS (unless specified, all are ceramic, 50V)

C321 C322 C323 C331

22nF.,63V

100nF., 100V 100nF., 100V 100nF.,500V

4H12421678

RESISTORS (unless specified, all are 5%,

R321 R321 R322 680 ohm R323 1k R324 47k R325 18k R326 2.2k R327 R329 330k R330 120 ohm R337 33k R338 33k

1 k (BM7513), (BM7523) 820 ohm (7BM613), (7BM623)

1k

V4W)

4H11150482 4H11150482

SEMICONDUCTORS - DIODES

0321 Diode - Zener (BM7513), (BM7523) 0321 Diode - Zener (7BM613), (7BM623) 0322 Diode - 8ilicon 4H13030847 0323 Diode - 8ilicon 4H13030621

4H13034278 4H13030861

SEMICONDUCTORS - TRANSISTORS

T8321 Transistor - NPN (BM7513), (BM7523) BF422 T8321 Transistor - NPN (7BM613), (7BM623) T8322 Transistor - NPN 4H13044246

4H13041589

LED BOARD

0106 0106

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

(BM7513)

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

(BM7523)

4H

13042242

CABINET PARTS

Block RetaineF f/AC Power Cord Cabinet (7BM613) 4H43070323 Cabinet (7BM623) 4H43070327 Cabinet (BM7513) 4H3070305 Cabinet (BM7523) Adjusting 8pindle flVert. Hold

Horiz. Width (3

used) Adjusting Spindle - Horiz. Phase Knob - Volume, Contrast, Brightness 4H41 023595

(3

used) Knob - Push Button (7BM613),

(7BM623) Knobs Foot f/Cabinet (7BM613), (7BM623) Foot f/Cabinet (BM7513), (BM7523) AC

8

Power Owner's Manual (BM7513), (BM7523) Owner's Manual (7BM613), (7BM623)

& Vert.

8ize

(2

used) (7BM613), (7BM623)

8upply

Cord

4H46691447

4H43070304

4H53591695

4H53570797

4H41024148 4H41310239

4H46240788 4H46240699 4H32110109 4H73650736 IB46060001

-

Commodore Part Numbers are not available at this time.

9

1901 SERVICE MANUAL

MAIN PANEL ASSEMBL V

~

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

i

:

Note: See page 6

for

waveforms

~

®S

Bottom

corresponding

®S

~

View

~

to

respective

waveform

numbers.

10

1901 SERVICE MANUAL

-

MAIN

PANEL

ASSEMBL

V

-

I

I~

_

___

_

__

---(-,.,.

__

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

Top

View

-

11

1.

ALL CAPACITORS

SCHEMATICS NOTES

UNLESS OTHERWISE SPECIFIED

ARE

IN

MFD. 50V UNLESS OTHERWISE SPECIFIED.

2.

ALL RESISTORS ARE % WATT, 5

3.

ARROWS

4.

RESISTANCE SHOWN

ON

CONTROLS INDICATE DIRECTION OF CLOCK-WISE ROTATION.

(COILS/TRANSFORMERS)

0

/0

UNLESS OTHERWISE SPECIFIED.

MEASUREMENTS.

5.

SCHEMATIC SYMBOLS @ ARE WAVEFORM TEST POINTS.

6.

C613 CLUDED

7.

1nF. =

IS

USED

IN

.001t,tF.,

FOR

FACTORY ADJUSTMENT PURPOSES AND MAY NOT BE IN-

SOME RECEIVERS.

10nF. =

.01t,tF.,

100nF. =

.1t,tF.

WARNING

ARE

IN-CIRCUIT

Critical components having special identified within

schematics or exploded Use

specified safety characteristics hazards.

Under no circumstances should or altered Electronics Corp. NAPCEC assumes no liability, express or implied, arising Servicer assumes all liability.

*Broken

with

an

S by

the

Ref. No. in

a broken line * along

views.

of

substitute replacement parts

without

line:

written

out

_.--_._._-

permission

of

any unauthorized

with

safety

the

parts list and enclosed

the

safety

which

may

the

do

create shock, fire,

original design be

from

the

modification

characteristics

symbol A on

not

have

the

same

or

other

modified

N.A.P. Consumer

of

design.

are

the

~.-.-

I 1201/

60Hz

.......

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TO.SA

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~

_______

+25

C521/R525

(-90V

~-100

0525/C527

~+60

0524/C525

~+550

0523/C524

1

151VI

(500VI

~

-lCJ-

~

~~

~[}--

SAFETY

RESISTOR

5FR25-

0.1251'1

CR37 - 0.251'1

CERAMIC-

FLAT-FOIL

ELECTROLYTIC

5j/,

5-10"-

~"I/

...

VIP"

24111

16V

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25V

63V

100\1

250v

w

600v

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----

(PM55191

ON

GREY SCALE AND

ADJUST

ON

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AC

DC

o.t.Ypp

()

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MAX MIN

0

0-

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+60

L6

1901 SERVICE MANUAL

AI

v

L.

C322

.

.,

100n

I

LV

+12

8

30V _ 5V-

0321

N1

12.5V

II

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VIDE:O

HORIZONTAl

+20

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SCHEMATIC DIAGRAM

~

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SAFETY

SFR

25

SFR

)0

MR

25 CERAMIC FLAT

ELECT

RESISTOR

0.2SW

0.2SW 5 -10j/, 1-2j/,

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J =

may

r = 25011

u=40011

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1

12

(:

commodore

(:

commodore

COMPUTERS

DOCUMENT REGISTRAT ION

Date:

The

return

ment

updates

ment

updates

of

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of

Name:

Company:

Street:

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________

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__________

Manual

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Issue Date:

of

this

of

__________________________

information

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information

and

changes

and

changes

must

____

________

______________

is essential

will

be

purchased.

be

purchased.

__________

be

distributed

be

distributed

to

__

Name

Number:

the

maintenance

the

maintenance

to

registered

to

registered

___

__

_

State:

Tear Here

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persons.

______

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Subsequent

_

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19:>&0

Commodore Computers PC 1901 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual