Commodore VIC-1525 Technical Service Data

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COMPUTERFACTSTM

PRELIMINARY SERVICE CHECKS

This

data provides

the

user

with

a time-saving service

tool

which

is

designed

for

quick

iso

lation and repair

of

prin

ter

m

alfunctions.

Check

all in

terconnecting

cab les for

good connecti

on and

correct

hook·

up

before

mak

ing service checks.

Replacemen t

or

repa

ir

of

the

Contro

l Boa

rd

or

connecto

rs

may be

necessary

after

the

malfunction

has been isolated.

GENERAL OPERATING INSTRUCTIONS

COMMODORE

MODEL 1525

Turn

On Printer, Power

Indicator

(010) sh

ould

be li t. L

ocate

the

Self-Diagnostic

Sw i

tch

(SW1) on

the

rear

of

printer.

Switch

position

number

4 is

normal

position for

one

printer

.

Position 5 is

for

two

printers.

Position

T is self-d

iagnostic

test

position.

The

Printer

will

continue

to operate in

pos

i·

tion T

until

the

Printer

is

turned

Off

or

Switch

SW1

is

switched

to

position 4 or

5.

Do

not

print

without

paper in-

serted

into pri

nter.

DISASSEMBLY INSTRUCTIONS

CABINET REMOVAL PRINTER MECHANISM REMOVAL

Remove

clear dust

cover

. Remove five

screws

from

cabinet

bottom.

Lift cabinet

top

from

un it.

Loosen

four

screws

holding

pri n

ter

mechanism

assemb

ly

to

cabinet

bottom.

Lift

assembly

from

cabinet

bottom.

@

CN2

CN3

CN4

CN5

SWl

SELF-DIAGNOSTIC

SWITCH

@)@@@@

Q3

CN7

CNS

CN9

CN10

CNll

Fl

FUSE

1A

®

Howard

W.

Sams & Co., Inc.

CN12

@

07

@

FUSE

1.5A F2

CONTROL BOARD

4300

West

62nd

Street,

P.O.

Box

7092,

Indianapolis, Indiana

46206

U.S.A

.

T

he

list

ing

of any available rep

lac

ement

part

here

in

does

not

Reprod

uction

or

U

S.,

witho

ut

expr

ess

permission.

of

~

itorior

or

pictorial

constitute

in

any

cos

. a

recommendation,

warranty

or guaranty

by

cont

ent,

in

any

mann

er,

il

p

rohibited.

No

potent

liabi

lity

is

ouum

.d

w

ith

Howard W. $oms

& Co .,

Inc

.,

as

'0

the qu

ali

ty

and

sUit

abili

ty

of

such r ••

pect

to

the

us.

of

the infor

mation

contained

herein

.

replacem

ent

port.

The number

s of

these

port

s h

ove

been com

piled

© 1

98.4 Howa

rd

W.

Soms & Co .. Inc.

fr

om

information

furn

ished

to

How

ard

W.

Soms & Co .. In<..

by

the

..

300

West

62nd S

treet

, P.o .

Box

7092,

India

napo

lis, Indiana

46206 U.S.A .

manufacturers

of the

part

icul

ar type

of

replac

eme

nt part list

ed.

Prin

ted

in U.S. of Am

eri

ca. 84CF14933 DATE 10.84

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[=:J

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CH2 CN3

CN-4

CNS

eN?

CNB

CNS

@ eNlO

eNll

CNI2

@)

@

I 3 2

Q3

@)

@ @ " " " ,@

FI

o

o@

@O

@

F2

Q2~

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~

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SWI

~

r:l

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ffi;

T S

-4

Cr\

@Q

®

f5D\

®

@)

@

® H ®

PRINT

HEAD

~

RECOVERY

HEAD

4E

GEAR

SOLENOID

HAMMER

SOLENOID

FLEXIBLE

SPRING

ROPE

CLUTCH

TRAIN

H2

HEAD

H1

CABLE

7-2

7-5

\

8-10

TR2

M1

ROTATON

DOT

DRIVE

DETECTOR

SENSOR

MOTOR

@

@@

HOME

HEAD

SENSOR

CONNECTOR

TR1

CN100

@

LINE

FEED

MECHANISM

F3

H3

LINE

FEED

500mA

LINE

FEED

ROPE

AC

FUSE

SOLENOID

®

@

."

::D

m

r

-

3:

z

»

::D

-<

en

m

::D

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CD

C.

-

CD

®

0

PRELIMINARY SERVICE CHECKS (Continued)

SERVICE CHECKS

SEE INTERCONNECTING DIAGRAM, PLACEMENT CHART, AND PHOTOS TO MATCH THE

NUMBER IN THE CIRCLES WITH THOSE IN THE FOLLOWING DATA FOR SERVICE

CHECKS TO

BE

PERFORMED.

POWER SUPPLY

(A)

Check the AC Fuse.

(B)

If

AC Fuse is open,

chec

k Bridge

Rectifier

D6

and D7

for

shorts.

(C)

Check

DC

Fuse F

1.

(

D)

If

F1

is

open, ch eck 03 for a

short.

(E)

Check

DC Fuse F

2.

(F)

If

F2

is open, check

02

and

04 for

shorts

.

HEAD CARRIER WILL NOT MOVE

(A)

Turn po wer O

ff

and

check

the Drive

Motor (M1)

for

continuity

and connector

CN6

for

bad con-

necti

on.

(

B)

Check

connectors

CN2 and CN3

for

bad

connec-

tion

.

Turn

powe

r On, measu

re

the Dot Sensor

(TR2)

for

proper

voltages.

(C)

Examine Rotation Detec

tor

(8-10)

for

defects.

(D)

Check for b roken Head Rope

(7-5).

(E)

In

spe

ct

the Gear Train for de

fective

gears.

NO LlNEFEED

(A)

Check

the

Linef eell Solenoid

(H3) for

continuity

.

(B)

Check

for

broken Linefeed Rope.

TEST EQUIPMENT AND TOOLS

TEST EQUIPMENT

Digital V

olt/

Ohm Meter

TOOLS

Phillips Screwdr

iver

Sol

der

ing Iron

De

soldering Equipment

0

CD

(C)

Inspect

Line Feed Me

chanism

for

defective

parts.

(

D)

Check

connector

CN9 f

or

bad con

nections

.

HEAD WILL NOT MOVE

TO

HOME POSITION

(A) Check

connector

CN8 for bad conn

ect

ion.

(B) With power

turned

Off, check

the H

Solenoid

(H2)

for

continuity.

(C)

Check for broken Recov ery Spring

(7-2).

(D)

Check

connector

s CN4 and CN 5 f

or bad

connec-

tions. Turn po

wer

On and measure the Home

Sensor

(TR1) for

proper voltages.

(E)

Inspect

the

Clutch

for defecti

ve parts.

HEAD WILL NOT PRINT

(A)

Check

connec

tor CN10 for

bad connection.

(B)

If the Pr int Head makes noise but doe s not prin t , inspec

t i t

for

a b

rok

en

Hammer

HAad.

(C)

Turn power O

ff

and

check

the

Print Head

S

ole

noid (H1)

for cont

inuity.

(D)

Care

fully

examine Print Head

Flexible

Cable

for

damage.

(E)

Check Print Head

Flexible

Cable conn

ect

or

CN100

for

bad c

onnection.

REPLACEMENT PARTS

ITEM

D6,

D7 F1 F2 F3 H1 H2 H3 M1 02 03 04

TR1 TR2

5-

5 7-5 7-

10 8-1

0

DESCRIPTION

Bridge

Rectif

iers (SI

RBAOO) Fuse (1A @ 250V) Fuse (1.5A

@ 125V)

Fuse

(5

00mA @ 250V)

Prin t Head Solen

oid

H Sole

noid Linefeed Solenoid Dri

ve

Mot

or

Regulator

Transi st

or

(2SB7030)

Regul

ator

IC (UA7805U

C)

Regulato

r IC (UA7812UC)

Home Sen s

or

(1108)

Dot S

enso

r (1108)

Pri

nt

Head Head Rope Recovery Sp ring Ro

tation D

etector

Cl

utc

h Linefeed Rope

TR

2

@)

CN2

@)

CN3

D

OT

SE

NSOR

5.

00y

l r 2

5_

00yl

2

5

.00

V

'

3.m

2.0~y

I

40

TRI

H

OME

SE

NSOR

\

@

$

DRIVE

19.4BV 2

10

MO

TOR

/

PRELIMINARY SERVICE CHECKS (Continued)

POW

ER

F3 @

T1

SO

OmA

120V

""o-------4v

AC

1]

0

I

g

SW2

240mA

340

r

TO

TI CASE

@

H3

LINEFEED

@

SOLENOID

490

H2

H

SOLENOID

%

490

u

CN4

@

CNS

C

N?

@

CN9

2

s.OOyl

2

I

2

I

2

CNB

I

2

3.?BY

4.

B2V

@

l

I @

Q3

~3

!

5.00

i

I

10.20V

Fl

@

l A

@

06

...

~

_\

~ ~

2

'7,·°'"

~

:\

~

'?

/,.20VAC

~ ~

~®

So

HI

PRIN

T

HEAD

SO

LENOID

CN

l l

I

2

C

N10

,

2

CNl2

I 2

®

*

~

07

'---

@

L--

@

F2

1.

SA

33.2V-

r-

Q2

~

"

@

~

2

20.2V

Q4

~

L--

J

Rl

150

INTERCONNECTING DIAGRAM

s::O

0°

oS:: mS::

,-0

.....

0

U'l0

N::D

U'l

m

SMtS

__

c_a_M_p_U_~_E_R_fA_C_T._:S_Tl.

_________

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Wit)

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It)

c

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MODEL 1525

PRELIMINARY SERVICE CHECKS

SAFETY PRECAUTIONS

Enclosed

See page

3.

INDEX

Page Page

Block Diagram .

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

. .

.......

...

. . . 5

Mechanical Parts

List. , ........

..... , ....

. .

10

Disassemb ly In

structions

...

....... .. ..

. .

....

4

Parts List

..

. . .

........ . .

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

. . 8,9,10

General Operating Instructions

...

. .

....

......

4

Photos

GridTrace Locatio n Guide

Chassis-Top view . . .

..........

.....

......

. 5

Control Board

...

. . .

...

. . .

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

11

Control Board " . .

.. ..

......

...........

6,11

IC Pinouts & Terminal Guides .......

........

15

Safety Precautions

......

. .... ....

.....

3

Line Definitions .

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

....

...

. . . 3

Schematic . . .

........

. . .

.........

.. ..

. . . . . . 2

Logic Chart .

...

. , .......

...

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

. , .7

Troubleshoot ing

........

. ,

.. ......

, .

.....

. . 4

Mechanical Removal, Replacement and

Adjustment. ...

......

. . .

.... 12,13,14,16,17

Howard

W.

Sams & CO., Inc.

4300 West 62nd Street, P.O.

Box

7092. Indianapolis. Indiana 46206 U.S.A.

T

h. lilting

of any available replac

eme

nt port

h.rein

does

not

c

onltitut.

In any co.e

a

recommenda

tion

. w

arranty

or

guaranty

by

Howard

W. Sam. & Co., Inc .. as

to

the quali

ty and suitability

of

such

r.placeme

nt

port. T

h.

numbers

of

t

he.e

parts have been c

ompil.d

from information

furnished

to Howard

W. Sams & Co., Inc., by

the

man

ufactur.rs

of

the

particular

type

of

r.placement

port list.d,

Reproduction

or

US.,

without

expre

..

perminlon,

of

editorial

or

pictorial

content,

In

ony man

n.r

,

II

pro

hibited. No

potent

liability

II

a

llumed

with

r

••

pect

to

,h.

ule

of the information

contained

~r.in.

Howard W.

Saml

& Co ., Inc.

.c3CX>

W.lt

62nd Str

..

" P.O .

Box

7rR2,

Indlanapolil, In

dia

na 46206

U.S

.A.

Prln •

.,j

in U.S.

of

Am.rlco

. 84CF14933 DATE 10-84

o

"'0

~

FROH

COI4P\JTER

S

...

P7

IPSI

)--DATA

5

P7 IPSI

)--ATTN

3

P7 IPSI

)--CLOCK

4

P7IPS)

__

)--RESET

6

P7 IPS)

)--SQR

I

P7 (PSI

h

P6

)--o.TA

5

P5

__

)--nTN

3

P6

)--CLOCK

4

P6

)--RESET

6

P6

)--SQR

1

11

P6

h-

S

...

74LS1<f

PART

OF

Ule

74LS14

PART

OF

lJ2C

DATA

CLOCK

L3

-

ATTN

RESET

lS

A PHOTO

FACT

STANDARD NOTATION

SCHEMAT1C

W!TH

'.i·i.liii."i3,

74lS104

....

PART

(FUX

R/il

Sl

RflI(

--

'1'

Hl;)wa,d

W.

Sams

8.

(0_.

Inc.

;986

MAIN BOARD

2

FlS32

P

U4D

P

R.4IVTI/'IER

P

DBO

DBl DB2

6504

llB3

U7D

OBi

HICft(V)ROCESSOR

D85

086

DB?

7.fi.S14

1-I)?406P

PART

OF

UTC

PART

OF

U2D

tfl7406P

PART

a-

U78

S

...

AD

AO

Al

A2

A.

A3

A4

AS

A6

A7

A7 A8 A8 A9 A9

Al0

All

A12

IRQ

....

R/J{

RES

?4LS11

74lS1<f

RES

PART

OF

Ule

PART

OF

U1C

NOTE.

Uil:)

NUHBERS

IN

( )

REFER

TO

24-PIN

CONfIGURATION

71LSOO

PART

Of

U1D

7.flSOO

PART

OF

U1D

P

D80

081

DB2

SS32

e

UBD

usn

IN

EPROH

RAlt/IO

S

...

PIJI

16

He

Ne

NC

He

Ne

AIO

Al1

AI2

74LSH

PART

OF

U2C

P

Ne

P

12

N/l()

NDl

ND2

ND3 ND4

NOS

ND6

ND7

PF

HOLD

CR

HOLD

Hl?4OSP

PART

OF

U2D

R9

150

RflI(

S

...

"

12

"

DBO

DBl

DB2

083

5522

084

U6D

085

IWVIO

086

0B7

1098

..IHOME

POSITION

SENSOR

S

...

/flO

H/fl

HIf2

ff13

""0

5."

7.fLSJ4

PART

OFU1C

HI

CARRIAGE

MOTOR

2S."

PIJl

14

25B794L

eQ17

PF

HOLD

-=0:01--1

~;:.o.--H~'------":;:;';;":'------'f""-f{

PHOTO

CIRCUlTRACE

=

II

5CHEHATJC

CIRCUITRACE

=

[jJJ

FOR

TERMINAL

GUIDES

ANO

HeTES

SEE

PAGES

16,19

CABLlNG.

HEAVY

LlNES

REDUCE

USE

OF

MULTlPLE

LlNES

LlNE

IDENTIFICATION

ASSlGNED

FOR

REFERENCE

,-----PBO

JS

S

...

~AIN

BOARD

PNl

NC---.7r-

nc

17

(JY

"3

PllJ

'U.

1j§OQ..

I I

11

PIJI

COMMODORE

MODELS 15261MPS·802

SAFETY PRECAUTIONS

1. Use

an

isola

tion

transformer for servicing.

2. Mai

ntain AC line voltage at rated input.

3. Remove AC power

fr

om the printer befo

re

servicing

or

installing electrostatically sensitive devices. Examples

of

typical

ES

devices are integrated circu

its and semic

onductor

"chip " components.

4. Use extreme caution when handling the printed

circuit

boards. Some semiconductor devices can be damaged easily by

static

electricity

. Drain

off

any electrost

atic

charge on your body by touching a known earth ground. Wear a commercial-

ly available

dis

charging wrist st rap device. This should be removed prior to applying power

to

the un it under test.

5.

Use a grounded-tip, low voltage soldering iron.

6.

Use

an

isol ation (times 1

0)

probe on sco

pe.

7. Do n

ot

remove

or

install board, mechanical or electrical parts, or other peripherals

with

printer AC power On.

8.

Do

not use

freon-propelled sprays. These can generate electrica l charges s

uffic

ient

to

damage

semiconductor

devices.

9. This printer is equipped with a grounded three-pronged AC plug. This pl

ug

must fit i

nto

a grounded AC power outlet. Do

not defeat the

AC

plug safety feature.

10

. Periodically examine the AC power co

rd

for

damaged or cracked insulation.

11

. The print

er cabinet is equipped

with

vents to prevent heat build-up. Never block, cover,

or

obstruct these vents .

12.

Instr

uctio

ns should be given, espec ially

to

children, that objects should

not

be

dropped or pushed in

to

the vents

of

the

cabinet.

Th

is could cause sho ck or equipment damage.

o

13

. Never expose the printer

to

water. If exposed

to

water turn the unit

Off. Do

not place the printer near possible water

~

sources.

~

3:

1

4.

Never le

ave

the printer unattended

or plugged

into

the AC outlet

for

long periods of time. Remove AC plug from AC outlet

~

g

during lightning storms. ~ 0

U'I::D

m

15.

Do

not allo w anything

to rest on

AC

power cord.

16.

Unplug

AC

power cord from outlet before cleaning printer.

17

. Never use liquids

or

aerosols directly on the printe

r.

Spray on cloth and the n apply

to

the pri

nter

cabinet . Make sure the

printer is disconnected fr om the

AC

power lin

e.

LINE DEFINITIONS

AO

Thru

A10

........

. . .... .

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

. Address Lines

ALE

.. ..

..........

......

.......

. Address Latch Enable

ATN ... .....

.....

. .... . . . .

....

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

Atten

tio

n

elK ...

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

......

.. _ ....

...

..

Clock

DATA

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

. . ....

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

Serial Data

DBO

Thru

DB7 ... .....

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

. Data Lines

DOF

DPl

ER

...

....

. .

...... . . . . . . . , ..... ..

.........

.

....

Error

RES ...

...

. . . .

........ .

.........

...

....... . Reset

SRQ ...

..........

. . .

........

.........

Service Request

Any Bar abo

ve

any alphabetical

or

numerical combination indicates line active in a low

(OJ

state.

3

GENERAL OPERATING INSTRUCTIONS

Turn On Printer, Power Inejicator (010) should be lit. Locate the Self-Diagnostic

Switch

(SW1) on the rear

of

printer

.

Switch posi

tion

number 4 is normal p

osit

ion

for

one printe

r.

Position 5 is

for

two

printers. Position T is self-diagnostic

test

position

. The Printer will

cont

inue

to

operate in posi-

tion T

until

the Pri

nter

is turned O

ff

or

Switch

SW1

is

switched

to

positio

n 4

or

5_

Do

not

print

with

out

paper in-

serted

into

printer.

DISASSEMBLY INSTRUCTIONS

CABINET REMOVAL

Rem

ove clear dust cover. Remove five screws from cabinet

b

ottom. Lift

cabi net

top

from un it.

PRINTER MECHANISM REMOVAL

Loosen fo

ur

screws holding printer mechanism assembly to

cabi net

botto

m. Li

ft

assem bl y from cabinet bottom.

TROUBLESHOOTING

POWER SUPPLY

Printer will

not

turn O

n.

Check the AC Line Fuse (F3)

. If

Fuse

F3

is open, check

for

shorted Bridge Rectifier Diodes

06

and 07. Also

check Electrolytics

C10 and C1

3,

and the

Power Tr

ansformer (T1).

Check

DC

Fuse (F1)

. If Fuse

F1

is open, check Zener Diode

04, Electrolyti c

C9,

and Reg ulat

or

IC

(03

) for

short

to

ground. Check

DC

Fuse (F2).

If

Fuse

F2

is open, check

Zener Diode 05, Regulato r Transistor (02), Regula

tor

IC

(04), and Elec

trolytic

C12

for

short to ground.

If

DC

Fuses

(F1

and

F2)

are norma

l,

apply po wer and check

f

or

5.00V at pin 2

of

IC

03

. If the v

olta

ge is missing, check

IC

03

, Resis

tor R14

and Zener Diode 04. Check

for

33.2V at

the emi

tter

of

Tra

nsis

tor

02,

and 20.2V at the collec

tor

of

Trans

istor

02

. If

either

voltage is missing, check IC

04

,

Zener Diode 0

5, and Resistors

R1

and R2.

CPU OPERATION

Check

for

5.00V on pin

40

of

CPU

IC

(P6).

If 5.00V is

missin

g,

refer

to

the·

Power

Supply·

section of

th is Troubleshooti ng

guide.

Verify the 6MHz Crystal (X1) is

OSCilla

ting

by checking the

waveform on pin 2

of

IC P6,

and check for a frequency of

6.00MHz. If Crystal X1 is

off

frequency, check Crystal

X1

and Capacitors C14 and C15. Also check

IC

P6

by substitu-

tion.

If

Crystal

X1

is functioning normally, check the waveform

and logic readin

gs

on pin s

B,

9,

11

and 39

of

IC

P6.

If any

wavef orm is

missing

or l

ogic

reading is

incor

rec

t,

check

IC

P6

by

substitutio

n.

PRINT HEAD

The Print Head moves back and

fort

h but is not printing.

Check

for

broken hamme r on th e Print Head and check the

resistance

of

the Print Head Solenoid

(H1

),

which should

meas u

re

5 Ohms across Connec

tor

CN10. If the hammer or

resistance is bad, replace the

Pr

int Hea

d.

Check

for

20.2V at the

emitter

of

Driver Transistor (0 1). If

the voltage is missing, refer to the " Power

Supply"

secti on

of

th is Troubl

eshooti

ng guide. If the voltage is normal,

check Transist or

01.

If Tran s

istor

01

is normal, check

for

pul ses at pin

27

of the

CPU

IC (

P6)

, pins 12 and

13

of Inverter

IC (PB), and at pins 7 and 10

of

Inverter IC (

P7)

to isolate the

defe

ctive stage. If all pulses were present, check EPROM

IC

(P4)

by substi

tut

ion.

4

HEAD CARRIER ASSEMBLY

Print Head does not move back and

forth

on carriage.

Check f

or

19.4BV a

cross

the Drive

Motor

(M1)

. If the voltage

is no rmal, check

Motor

(M1), the Dot Sen

sor

Assembly

(T

R2), and check

for

an

obstruction

in the drive gear

assembly.

If

19.4BV

acro

ss

Motor (M

1)

is missing , check

for a low

logic reading during the drive sequence on pin 16 of Inverter IC (

P7).

If

the reading is

not low,

check for a high

logic

reading

on pin

30

of

CPU

IC (

P6),

and a high logic reading

on

pin 6

of

Inverter IC (PB)

to

isolate the defective stage.

LlNEFEED OPERATION

Printer will not advance the pape

r.

Check the resistance of

the Linefeed Clu

tc

h Solenoid (H3), which should read

49

Ohms across Con

nector

CN9. If Solenoid H3 is normal,

check for d

efective

mechanical parts in the Li

ne

Feed Clu tch Assembly. Check for a l

ow logic

reading at pin

12

of

Inverter IC

(P7),

and at pin

2B

of

CPU

IC (P6)

during the line

fe

ed

sequence

to

isolate the defective stag

e.

HEAD HOME POSITION OPERATION

Head wi ll not return to Home P

osition

after

printing

first line. Check for a broken recovery spring and also check the Head Release

Clutc

h Assembly

for

defective parts.

Check the resistance of the H Solenoid

(H2),

which should

measure 49 Ohms across pin s 1

an

d 2

of

Conne

ctor

CNB. If

Solenoid H2 is norma l, ch eck the Return Home Sen

sor

(TR

1)

and check

for

a low lo

gic reading at pin

13

of

Inverter IC (

P7)

an

d at pin

29

of

CPU

IC (

P6) dur

ing a return home sequence

to

isolate the defective stage .

PRINTER WILL NOT RECEIVE DATE (SELF TEST OPERATES)

Program Co

mputer

to

send information to the Printer.

Check for pulses at pins 1

,4,

6,

and

3B

of

CPU

IC

(P6).

If

pulses are missin

g,

check the logic readings

of

IC's

P1, P2,

P3, and PB to isolate the defective components .

SELF TEST DOES NOT OPERATE

Connect a frequency counter to pin 2

of

CPU

IC

(P6

) and

verify that the 6MHz Crystal

(X1

) is oscillating. If Crystal X1

is fun ction ing normall

y,

check

IC P6, EPROM

IC

(P4)

and

LATCH IC (P5) by substitution.

BLOCK DIAGRAM

CHASSIS·TOP VIEW

3:0

00

03: m3:

,...0

.....

0

U'l0

N::u

U'l

m

5

0-

0

o

z

~

:II

o

r-

aJ

o

l>

:II

C

•

:z:

o

~

a

iL

~

'"

a

3

..

I

,

::r

o

0'

PIN 1

1

CN3

CN2

1

5.

00V

1

CN9

CN10

1

CN11

Ie

NO

.

PI

1

P

2

P

3 L 4

H

5

H

6 L

7 L

8 L 9

H

10

L

11

H

12

U1

)

13

H

14

H

15 16

17 18

19

20 21

22

23

24

CONTROL BOARD LOGIC

Ie Ie

Ie

PIN Ie

Ie

P2

P3

P4

P5

NO.

P6

NO

. P6

NO.

H H H H

L L

L H

H

H H

H

P(

1)

L 1 L

21

P

1

H

P(

1)

P(ll

2

P

22

P(3

)

2

H

P(2 )

P

O)

3

(7)

23

P

3

H

P( 2)

P

(2)

4

H

24

P

4

L

P

(2)

5

H

25

H

5

H

P

P 6

L 26

H 6

L

P

7

H

27

P

7

P P P 8 H 28

H

(5)

8

P

9 P

29

H(

2)

9

H P

L

10

H

30

U3)

10

P P P

11

P

31

H

11

P

L

P

12

P

32

H

12

H

P P

13

P 33

H

13

H

P

P 14 P 34 H 14

P

15

P

35

U l )

15

P

P(2)

16 P

36

L

16

P( l )

P

17

P( 2)

37

H

P P

18

P 38 L

P

P(

1)

19

P(

1)

39 P

L

H 20 L 40

H

P P

(3

)

P H

NOTE: Logic probe readings taken with

printer

turned On,

the S

el

f Diagnos

tic Swit

ch (SW1) set to the T(Test)

positio

n and

print

head printing un less noted.

Logic Probe Display L=

Low H = High P = Pulse

(1)

Probe indicates H when print head

is

at Home

positi

on.

(

2) Probe in di cates L when

print head

is moving from right

to

left (Home

).

(3) Pr

obe indicates H when

print

he ad is movin g from right

to

left

(Home) .

(4) Pr

obe indic ates P whe n print he

ad

is moving from right

to

left (Home ).

(5)

Pr

obe in

dic

ates L

during

linef

eed

(6)

Probe indicates H during

linefeed

.

(7) Any

attempt

to

measure

will shutdown

th e

printer

.

Ie

P7

H(

2)

H

(2

)

U 3 ) U

3)

U6)

U 6 )

P

(2)

L

H

P

(3)

H(5) H(

5)

H

(2)

H(2 ) P

(3)

p(3)

Ie

P8 L

H L

H L(

3)

H(2

)

L U3)

H(

2)

U6

)

H(5

)

P

(2)

P H

o

"tJ

~

7

0:1

PARTS LIST AND DESCRIPTION

When ordering parts, state Model, Part Number, and Description

SEMICONDUCTORS (Select replacement for best results)

REPLACEMENT

DATA

ITEM TYPE

MFGR.

NEW·TON E

PHILIPS

No. No.

PART No.

GENERAL

MOTOROLA

RCA

WORKMAN

ZENITH

ELECTRIC

NTE

ECG

PART

No

.

PART No. PART No.

PART

No.

PART

No

.

PART No. PART No.

01,2

IS1588

GE-514

IN

4935

NT

E519

ECG519

SK3100/519

W

EP

925/519

103-

131

03

30CB

GE-504A

lN4003

NTEI16

ECGI16

SK331 I

WEP156

212-76-02

V06C

GE

- 504A

IN4003

N

TE

116

ECG116

SK3311

WEPI56

212-76

-0

2

D3A

04

HZ6C2

GEZD-6.2

IN5234B

NTE5013A

ECG5013A

SK6A2I5013A

WEP1414/5013

103-Z9008

05

HZ9A2

G

ElD-8.2

lN5237B

NTE5016A

ECG5016A

SK8A2I50

16A

WE

P141715016

103-Z9019

06

, 7

SIRBAOO

GE-5304(11)

MDA920A6(11

NTE5304(11)

ECG5304 (

11

)

SK3106/5304(11)

WEP1053(11)

SIRBAIO

GE-5304(ll)

MDA920A6(II

NTE5304(11)

ECG5304(11)

SK3106/5304(ll)

WE

PI053(11)

PI

MB74

L

SI4

SN74LSI4N

NTE74LSI4

ECG74LS

14

SK74LS

14

H

E-443-872

P2

SN74LS08N

NTE74LS08

ECG74LS08

SK74LS08

HE

-

443-780

P3

MB74LS74A

SN74LS74AN

NT

E74LS74A

EC

G74LS74A

SK74LS74

HE-443-730

P4

M5L2732K

273212332

P5

SN74LS373N

NTE74LS373

ECG74LS373

HE-

443-867

P6

D8039LC

MB8881N

MB8881

P7

ULN2003A

NTE2013

ECG

2013

SK909312013

75468

NTE2013

ECG2013

SK909312013

P8

SN7406N

GE-7406

NT

E

7406

ECG7406

SK7406

01

2SB703O

GE-303

MJ

E15031

NTE292

ECG292

SK3441 1292

WEP781

1292

121-Z9048

2SA636

GE-29

MDS77

NTE187

EC

G187

SK9076/187A

WE

P7521187

121-988-03

02

2SB703O

GE-303

MJEI5031

NTE292

EC

G292

SK3441/292

WEP7811292

121-Z9048

2SA1069C

NTE55

ECG55

SK9367155

03

UA7805UC

GEVR-I02

tlC7805CT

NT

E

960

EC

G960

SK3591/960

221-Z9043

UA7805C

GEVR-I02

tlC7805CT

NTE960

E

CG96

0

SK3591/960

221-Z9043

p4

UA7

8

12UC

GC:VR

-lll

MC

7812CT

NTE966

ECG

966

SK35921966

W

EP

966L1966

HE-442~74

UA7812C

GEVR-lI1

tlC7812CT

NT

E

966

ECG966

SK3592/966

WE

P

966L/966

HE

-442-674

RI,

2

1108

(II)

MountIng

techn

Iq

ue

may

vary

from

orIgInal.

PARTS LIST AND DESCRIPTION (Continued)

When ordering parts, state Mode

l,

Part Number, and Description

CAPACITORS

Items

not

listed 8re

norm8

11y

8v8118b

l e

8t

loc81 distributors.

ITEM

RATING

MFGR.

No.

PAR

T No.

C17

•

0047 125VAC

RESISTORS (Power and Special)

ITEM

No

.

RATING

RAI-I

Resl

stor

Network

(1)

RA2-1

Res I

stor

Network

(1)

(

I)

Cont~Ins

ei

ght

1000 10%.

TRANSFORMER(Powe~

IT

EM

RATING

No.

PR

I.

SEC.

1

S

EC.

2

T1

120VAC

9.20YAC

24.00YAC

i

240mAAC

310mADC

583mAOC

(I)

Number

on uni

t.

FUSE DEVICES

ITEM

NO .

DESCRIPTION

DEVICE

FI

IA

i 250V

Fast-Acti

ng

F2

1.5A

i

125V

Fast-Actl

ng

F3

500mA

i 250V

Fast-Acti

ng

2

50m

A i 250V

Fast-Acting

ITEM

No.

MFGR.

PART No.

MFGR.

PART

No.

ETP57EI59G(1 )

MFGR.

PA

RT NO.

RATING

REPLACEMENT

DATA

NEW·TONE

PART

No.

REPLACEMENT

DATA

THO

RDARSON

PART No.

HOLDER

MFGR.

PART

No

.

WORKMAN

PART No.

NOTES

9

PARTS LIST AND DESCRIPTION (Continued)

When

ordering parts, state Model, Part

Number, and Descript

ion

MISCELLANEOUS

ITEM

PART

NAME

MFGR.

NOTES

No.

PART

No.

0

10

LED

Po

wer,

Red

(1.62V

@

12mA)

HI

Head

Prin

t

H2

So

lenold

H

H3

Solenoi

d

Li

ne Feed C

lutch

Ml

Motor

DrIve

SWI

Switch

Se I

f-

DI a

gnostl

c

(4/5/T)

SW2

Swi

t ch

Power

(On/Of

f)

Xl

Crystal

6M

Hz

CABINET & CABINET PARTS (When ordering specify model, chassis & color)

ITE

M PA

RT

No.

Soundproof

Cover

Unit

U

pper

(A

se

Un I t

WIRING DATA

Shi e lded Hook-up Wire

••••••••••••••••••••

Genera l- use

Unsh

ielded

Hoo

k-up Wire

••••••

MECHANICAL PARTS LIST

REF.

PART

DESCRIPTION

NO.

NO

.

6-1

Llnefeed Rope

Spri

ng

6-2 Reverse Stop

Claw

6-3

Reverse

Stop Sp

rin

g

6-4

Llnefeed

Clut

ch Solenoid

6-5

Llnefeed Claw

Wheel

6-6

Gear Pin

6-7

Claw

Whee

l Un

it

6-8·

Claw

Wheel

Sprin

g

6-9

l

lnefeed Claw

Stopper

6-10

Linefeed

01 al

6-11

Dia l Clut ch Sp

ri

ng

7-1

FPC

Guide

7

-2

Recovery Spri

ng

7-3

Ro

pe

Sprl

ng

7-4

Ro

pe

Sto

pper (1 set)

7

-5

He

ad

Rope

(l) Unit

7-6

Feed

Drum Un

it

7-7

Dr um

Spri

ng Step

7-8

Dru

m Spring

7-9

Pul ley Pin (2 used)

7-10

Spring P

ul

ley (2 used)

7-11

Rope

Pul ley (4 used)

7-12

Gu I de

P I I I a r

7-13 Damper

10

ITEM

PA

RT

No.

Lower Case

Un

it

Ribbon

Cassette

Use

BELDEN No. 8401

or

8421 (Sing Ie-Con

ductor)

82

08 (T

wo-Co

nducto

r)

Use

BELDEN

No.

8528 (So l

id)

Ava

ila

b le In

13 Col

ors

8522 (Stranded)

Ava

i lab le In 13

Colors

REF.

PART

DESCRIP

TION

NO.

7-14

Carrier Unit

8-1

Clutch Moving

Sprin

g

(H3)

8-3

CI ut c h

Step 8-4 CI utch 8

-5

S

prl

n~

Pan

8-6

Clutc Spr

ing

8-7

CI utch

8-

8 Reduct i

on

Gear

8-9

Gear PI n

8-10

Rotation

Detector

8-11

Reduction Gear

8-12 Gear

PI

n

8-13

Reduc

t ion

Gea

r

8

-14

H SolenoId (H

Z)

8-15

Dr Ive

Motor (Ml) 9-1 Soundproof 9

-2

Gu

I de P I I I a r

9-3

Paper

Hoi

dar (Ll Un I t

9-4 Paper Ho lder

(R)

UnIt

9

-5

P

laten

Bearing

9-

6

Tractor Shaf t

9-7

Pin Feed Rol l

er

(2 use d)

9-

8

Tractor Rubber Ring (3 used)

9-10 Rubber leg (4 u

sed)

:l-

11

2

~~~~

8

~~II

.

ll

;~~~~

A

••

..

•

..

~

.

•.

I,

i.

;1

1

I A

I

0

~

B

.OI.~~.\1"E

•••

•

lIl_E

I

II

\1

Ii

,I

I

'\

)

l1llll

l

o

~

]:1

I iFI

••••

II.

B

a

0..

~

If>

a

C

__

'"

___

1_114

____

I\Jlilll

.1111

1

__

C

3

'"

I

D • -

_____&WP

..

EtJ.Q.5)£~!l!vl

..

·;

'_MIMi&3

D

1 I 2 I 3 I 4 I 5 I 6 I 7 I 8 I 9

110

111

112 113

114

/15

"U

OJ

0

a

0

Z

-t

:tI

0

r-

m

0

~

:tI

C

CONTROL BOARD GrldTrace LOCATION GUIDE

* Located

on

other

sIde

of

board.

Cl

C-3

C

ll

B-6

CN6

A-6

03

A

A-9

P4

C-4

R2

B-1

R

12

B-14

C2

B-1

C12

0-12

CN7

A-l0

04

0

-9

P5

C-5

R3

B-1

RD

A-8

C3

A-I

CD

B-14

CN8

A-II

05

C-13

P6

B-6

R4

C-3

R

14

C-l0

C4

A-5

C14

A-5

CN9

A-12

06

C-ll

P7

B

-7

R5

A-5

R15

C-9

C5

0-4

C15

A-5

CN10

A-13

07

A-15

P8

C-

7

R6

C-3

RAl-1

B-1

C6

0-5

C16*

A-l0

CNll

A-14

Fl

B-ll

Ql

B-8

R7

B-9

RA2-1

C-8

C7

C-7

CN2

A-I

CN12

A-15

F2

B-15

Q2

B-12

R8

0

-13

Sill

0-1

C8

0-8

CN3

A-2

01

A-3

PI

B-2

Q3

B-l0

R9

B-1

TP2

A-7

C9

C-9

CN4

A-3

02

B-6

P2

B-3

04

0-12

RIO

B-1

TP3

A-7

Cl0

C-l0

CN

5

A-3

03

A-

8

P3

A-4

Rl 0

-3

Rll

C-ll

Xl

A-6

S~S~

1300W

3~OOOWWOO

MECHANICAL REMOVAL, REPLACEMENT AND ADJUSTMENTS

PRINTING

PRINTING MECHANISM

This Printer is based on a single printin g hammer system

which

Is q

uite

unique and

different

from other impact dot

pri n

ting

systems. The

tim

ing

of

hammer printin g depends

upon revolution

of

the rotation detector. This revolution,

rightward movement

of

the hammer and th e revo lution of

the platen are synchronized. Character

an

d graphics do

ts

are printed when the relative

posit

ion s of the hammer he

ad and the platen are encountered. The relationship of the hammer,

th

e platen and the dot sensor is show n in Figu

re

1;

that

of

the hammer head, printed dot, and signals of the dot

sensor in Figure

2.

FROM ®

.

~

H

AS

A S

LQPE8

PLATE

N 10 rps (Rn-olut ions of motor a

f'

reduced

10 1/6 by redu

ction

gllr)

H

Uh'.nlydiw

idld

18ridge1

PI .

p,

......

Pl~

V IEW POINT / H

AMM

ER

HEAD

PA

RT

® . AG

AIN

ST RIDGES

DETA

ilS

OF

PART ®

FEED

DRUM

UNIT

Figure 1

HAMMER

HEAD

Figure 2

Idl

~

OISTANCE

BETWEEN DOTS

-'-,

SLOPE

OF

HAMME R

8.t.

n~

p

ADJUSTMENTS

FOR

PRINTING

Make the

followi

ng adjustments after sett ing the ribbon

cassettes and paper. (1)

Adjusti

ng the

position

of

the dot sensor

Print characters and check the da rkness of the upper· and the lower part

of

characters.

If

the darkness is not equal,

adjust

the position

of

the

dot

sensor.

E

I.)

........ lig

ht

E

Ib)

E

Ie)

" light

(b) ... . Upper

part

is

li

ght,

mo

....

e

the dot sensor to right.

(e)

... Lower

part

is light, move

un

it it

to left

.

Black and red

dot sense LED wire

Figure 3

(2)

Adjusting the printing start posi

tio

n with the carrier

unit

an

d the home sens or

i)

The gaps between the carrier unit and the home

sensor Gaps A and B should be about O.5mm, with B

smaller than C. The gaps can be adjus

te

d by

twisting

obli que line part of the earth plate (L).

Eanh

plate

(L)

Yellow and black,

home sense

~ffi1:o

m'

sen,,,

un;t

l~

arr;

"

un"

--

==o;

ft=

~~:

~,...1

-

PH wi

re

C

...,~8

ii)

Figure 4

Adjustment

for

aligning the start position of print·

ing

(C

onnect T

P2

and TP3

of

PCB unit

to

oscillos

cope)

Adjust the position of the home sensor

unit

so that the falling-edge of the home sensor pulse can be with in the permis sible range

of

the dot sensor

pulses.

Dot

..

nsor

-.fl---'----I

~

L

Homesenso,

-----.

-

~

Figure 5

P

erm

issible range in whic

h

the

fallirlil'

edge of

the

hom

e sensor shouk:l be,

If

the falling-edge

of

the home sensor pulse sh

ifts

to

right .

.....

. S

hift

the home sensor un

it

to

right.

If the falling-edge of the home sensor

pu

lse sh

ift

s

to

left .

......

. . Shift the home sen sor unit

to lef

t.

Pr

inting Pressure Adj

ustm

ent

You may adjust a lever on the print hea d according

to

the

thickness

of

the paper. If smudging occurs or if printing is

too

dark, mo

ve

this lever one

click

hole counterclockwise at

a time

unt

il you are satisfied with the print ing quality ;

if

printing is

too

light, move it clockwise. When adjust ing the

leve

r,

make su

re

that it is placed

dir

ectly in the hole, not "in

between" two

of

them .

Figure 6

Courtesy

of

Commodore Business Machines, Inc.

12

MECHANICAL REMOVAL, REPLACEMENT AND ADJUSTMENTS (Continued)

CARRIER

CARRIER UNIT MOVEMENT AND RIBBON FEEDING

Figure 7 shows

right

ward moveme

nt

of the

carrier

unit and

ri

bbon feeding due

to motor revolutions.

Figure 8 describes

the carrier u

nit

's return to the

home

position, acti

vated

by

the

H solenoid.

PRINT

DIRECTION

OF RlaSON

MOVEMEN

T

HEAD UNIT

RI

BBON

CAM

RI

t:lBO

N FEE D BOAR D

RI8

80N

CA

M Figure 7

RIBBON

C~M

£

SPRING

~

RI

BST \

FEED BOA

RD RIBBON

Ribbon is fed in the arrow direct ion when

ribb

on is caught

be

tw

een ribbon cam and ribbon feed board. When carrier

unit

returns left

ward , ribbon is not caught.

When H

solenoid

is pulled,

the

clutch

is released and the

carrier

unit

returns

to

the le

ftmo

st h

ome

posi

tion fo

rced by

the

re

covery spring.

CON

STRUCTION OF H

SO

LE

NOlO

AND

CLU~CH

:;

CLUTCH

H SOLENOID :: (JAW CLUTCHI

~.

--i

__

;1

<""""\..,',J'

.J

t=

-g

!:"i

1l11/11111

~--·~

l'--------i;

~L...

j

CARRIER UNIT AND PR

INT

HEAD

UNI

T

-I-

r--t'.:/j/" '

:,

111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

I

RE

COV E

RY SPRING

Figure 8

LlNEFEED

LlNEFEED MECHANISM

Figure

9 sho ws the linefeed

(p

aper feed)

controlled

by the

motion

of the LF s

olenoid

. The LF

soleno

id

is

act

ivated

three

times for

printing

characters and

two

times

for

prin·

ting

graphics.

The tran

smission

sequence

of

a LF

solenoid

motion

is:

'-LF--

I_

Q~

LF

CLAWI_~

~

TRACTO

R~TRACTOR

I

~

_)

WHEEL

~

__

The

condition

of

the claw wheel

unit

when

the

LF

solenoid

is

inactive is:

i)

The claw wheel

unit

is pulled by the LF rope spring.

ii) The saw

teeth

of

the LF claw wheel and the saw teeth which are pushed by the claw wheel spring are coupl· ed

.

/1

6

9·'

/

--1

63,,£-

W.51 6.2

'f.l

, 6·8

E40

I)

W

~

S·28

.:

LUb"cale

SF.

,00o

n t

2:::J

hesaw

e;;.

-/I!

teeth

and

the t

eeth parts

of

-'

65.od

6·7" / " 6

.1

S-

31

6.4

01

Figure

10

Lu

bricat

e

SH

OO

on

LF

rope

• 1

6-6

sho uld be

In

the

groo

ve

of

6-5,

but

not

In

t

hat

of

6 ·] .

. r

"1

6·4 AND 6·9 ADJUSTING METHOD

i)

ii)

iii)

While

pushing

dow

n part ® of 6

-4,

fix 6·4 with S-31

at

the pos

itio

n where 6·2 falls from a t

ooth

top

of 6·5. The

screw

S-28

should

be set

to

the

direction

as

shown

in

the le

ft

figure.

:s:::

0

0 0

While pressing part ®

of

6-

4,

fix

6-9 w

it

h S-32 at the C

~

position

where ® part

of

6·9 and ® part

of

6

-7

are m 0

coupled

to

stop

the

revolution

of

6-7

.

~

C

Confirm

linefeed

functions

by

pressing

part ®.

EARTH PLATE ILl

·1

6 4 and 6 9 adJusting

meth

od

6-2

''I''

~I:

,

....

",

't

~1)

)

5

31

~~

'

7")/5

h S 28 6

\@ ©I

.1

r··

- \ ,

i~

/'"

Figure 9

. ,'

~

,

""=--

I ~ '-

~

6"'

Figure

11

U1 0

N

:;o

U1

m

C

ourtesy

of

Commodor

e Business Machines, In

c.

13

MECHANICAL REMOVAL, REPLACEMENT AND ADJUSTMENTS (Continued)

LOWER CASE BLOCK

AND

MACHINE

ASSEMBLY

' 1

Be

fore replacing 2-3 and 2-4 with 2-2, the carrier unit

m

ust

be moved

to

the center. When setting 2-3 and 2·4,

be careful n

ot

to

catch the lead wires

or

the recovery

spring between

2-3 and 2·4, and to damage or to inju

re

them.

'2

Pay attention not to damage the fle xible cable.

Do not mo

ve

the carrier unit

directly

by hand.

By

pulli

ng and revolving the clutch on the right side'counterclockwise, the carrier unit can be moved

to

the center.

Part

® setting note

II

I

nse

rt twist

ed ends of

l

ead

wire

and make

S1Jr

e

they

are not shorted.

TRACTOR

'1 Push 9

-9 outside

as far

as

it will go and fix with 5-3

2.

'2

Assemble the tw o

9-7

so that the pins of th

em

are faci

ng

each

othe

r.

'3

Ch

eck that the surface

of

9-6

(Q

part is smooth a

nd

has

no scar.

9·10

2·3

Courtesy of Commodo

re

Bus iness Machines, Inc.

14

Figure 12

Figure 13

Uflplug/plug

In

Lu

bri

cate

SF-1

OO inside

15

IC PINOUTS & TERMINAL GUIDES

MB74LS

7IA

I IC

LR

vec

14

10

CL

R

1CLR

CLR

13

0

IC!

CK

0

20

12

IPR

CK

2C!

II

PR

10

PR

lPR 10

10

QQ

20

7

GNO

10

P3 fLIP/flOP TOP

VIEW

@

.,.

?b~.

,.

CNI

PIN VIEW

101.

I

Il

1

II

,

1\

,

10

, ,

1 8

PI. PI.

P8

TOP

VIEW

M5

12m~

I

A7

v

ce

24

I

T0

1

A6

A8

13 2 HAL

3

AS

A9

11

3

HAL

4 M

All

21

4

RESET

5

A3

OEN

PP

10

5

SS

6 AI

AID

19

6

iNT

7

AI

C1

18

)

EA

8

AD

07

I)

8

RD

9

00

06

16

9 P

SEN

10

01

05

15

10

WR

II

02

04

14

II

ALE

12

GNO

OJ

13

11

DBO

13

OBI

P4

EPROM

14

OBI

T

OP

VIEW

15

DB3

16

OB4

17

OB5

18

D

B6

19

DB)

10

VSS

~

"'

~"'

B C [ I 2 J

01

.

02 Q3.

04

fRONT VIEW

fRONT

VIEW

D8039LC

P6

CP

U

TOP VIEW

OUTPUT

\'CC

40

CONTROL

J

TI

39

P27

38

P26

37

P25 36 P24

35

PI7

34

P 16

33

m

31

P

14

31

PI3

30

PI2

29

PII

18

PIO

27

VD

D 16

PR

OG

15

P23

14

P22 23

P21

22

P20

21

3

.. ~ 60

I 8 9

RA

I·I

fRO

NT VIEW

"

I I

~~:'

I 1 ) , S 6 J S

1A1·1

fRONT VIEW

SN74LS373

N

P5

o

TYPE

LATC

H

TO

P

VI

EW

UlN

2D01A

15

14

13 II

11 ENABLE

G

»

--~1

6

»-.--H

I3

..:x>

-.--H

12

,><>-.--~

II

P7

INVE

RTER

TOP

VIEW

CNIOO

WIRING VIE

W

MECHANICAL REMOVAL, REPLACEMENT AND ADJUSTMENTS (Continued)

FEED DRUM AND CARRIER UNIT

Lubr ication on

7 -

10,

7 ·11

and

the

shaft

of

7·6

o

7·'

Lubricate SF -

l00

on

the

groove

and

the

shaft

of

7-1 1 r

ope

pulley

14

pes

.)

lubr

icate

SF-

1OO

on

the

groove

and

the

s

haft

of 7-1

0 spr ing

pulley

(2 pes-I

W·

32

S·30

Earth plate

(R)

Clutch

Figure 14

"'

The cam 7-16 and t

he

bend

of

the ribbon feed board

must

be parallel. I f not parallel, r ibbon feeding may fu

nctio

n

abno

rm

ally. In t his case , you can either change 7-16 or

ad

just the bend

of

the ribbon feed board by using pliers

to fi t the cam

7·16.

B

endot';bboniQ

i

~

I

feed

boar

d

Cam

]·

16

I

IIt"",.;s.nygD

~r~

r

eplace 7-16

Figure 15

'2

When 7-14 is at t he home

pOS

ition, there shou ld be gaps

between

the

home sensor (Refer to Figure

4).

"3 Firm ly insert

7-12 into

the

earth plate

(R)

and

(L),

and

tighten

with N-31.

·4 Once you have removed t

he

feed drum

unit

7-6

, you

must

install a new one. A ne w one, which has

six

winds

of

the

head rope

(R),

is fixed by a fi xing

too

l.

The

fix

ing

too

l

should be taken

off

after

you have

finished

assembling

with S-29 screws.

Head

rope (R)

i Be careful

not

to

Itt

tht

fiXing

too

l

~

J.

~~:

ft~i

.d"

... d ","

01

tn.

"ead

/·6

F

..

,ngt~ ~

. .

"~Adheredpartof

~ ~ F"

',!o~

head

>ope fRI

1

Figure 16

"5 Insert the rope

stopper

7-4 into the rope spring 7·3.

·6

To

fix the head rope

(L)

and

(R)

using screw

S·29:

0

i)

Inject

screw

lock

into

the screw

hole

of

the c arrier

3:

0

unit.

03:

ii) T

ighten

the

screw S-29 to the extent

tha

t the ring s of ~ 3:

the head rope

(R)

and

(L)

can be revo lved.

r-

0

....

0

'ff'"

Screw 5·29

ScrewS ·29

~

Do

not

Inject

hen

c::Il

lniect

screwl

ock

im.d

e

11

-R Irtg must

be

able

__

to

turn

around.

Screwlock shoukl

not

be overfloW@d. S

crew

lock

Figure 17

'7

Check the

following

after

attaching

the recovery spring

7-

2.

After

manually pulling and revolving the cl

utc

h

counterclockwise

to

move the carrier unit to the right

end, check the gaps

of

the rope

stopper

7-4

and the

adhered

position

and status

of

the feed

drum unit

7·6.

Adhe-re::i positIOn Sl'Iould have

rooms

/_

."

when

carrlet' unrt

is

~

at

the

rlghtm

on

end.

~ ~

1_ S

houkj

have

rooms

_ f

at

the home pOsitio n

~

FeecI

~rum

Head

rope

fA)

•

umt

7-

6

Rope

S'lapper 7·4

Shoukl

havt

gap

s

Figure 18

After

pressing the H solenoid

to

release the

clutc

h

(Figure 8), check the

smooth

motion

of the carrier unit,

its return

to

the home position, and al

so

the adhered

positio

n and i

ts

status

of

the

feed drum unit 7·6 at

the

home position.

UlO

N::u

Ul

m

Courtesy

of

Commodore BUSiness Machines, Inc.

16

MECHANICAL REMOVAL, REPLACEMENT AND ADJUSTMENTS (Continued)

GEAR TRAIN

'1

The way

to

set 8·10 and 8-

9.

Attaching method

of

8-10

When a platen ridge is at the horizontal

position,

cou-

ple 8-10 and

8-1

3 in the

status

of

a, and a7 of

8-10 faCing

the two

screw

holes

of

the

earth plate

(R)

respectively.

Attaching method

of

8-9

Fit

the

holes

of

8-10 and the

motor

shaft, and then in-

sert

8-9

using

pliers.

'2 First, insert the

M.

stop screw i nto t he rubber leg (Figure 12), and then f ix 8-2 by S-31 . Make sure there are gaps betwee n the grooves of

8-2 and 8·10.

Motor

'haft

L

ubr

icate SF·1

00

on the sow

tooth

pan

and the tooth

pan

of B-4 and

8·7

l

LUbricot. SF·'OO

on

both

ends

_ Block and

rod

Grooye

'2

?

~

-4

8.2 5·31

Black

and

white

Figure 20

.,~a

,

8·, 3

Sc~·holes

for

fixing

the

dot

sensor

of

the

eanh

plate

fA)

Figure 19

Lubriatl

SF-

l00

to

tooth

of

8·13, 8·11

and B·8

Courtesy

of

Commodore BUSiness Machines, Inc.

17

CP4

COMPUTERFACTSTM

put

easy

to

use, informative technical

data

right

at

your fingea'tips. Each edition includes specific

service information on

the

individual component,

along

with some overall troubleshooting hints.

The

following

information

is just a

sample

of

the

many

valuable

time

saving

features

contained

in this exclusive Sams COMPUTERFACTS

publication

:

• Preliminary' Service Checks section is

an

easy to use, step by step

guide

for

the

experienced

technician

or

hobbyist,

and

even beginners.

• SAMS

famous

industry' acceRted

standardized

notation

schematics

contain

ing

ORCUITRACE

@

,GRIDTRACE

T

",

waveforms,

voltages

and

stage

identification

.

•

Step~y'

Step-

Troubleshooting

guides

the technici

an

through

the necessary

procedures

to

quickly

locate

the

problem

.

TROUBLE

S

HOOTING

MICROPROCESSOR CHIP (CPU) OPERATION

Ve

rily

the

processor

IS

fun

ct

io

nin

g by ch

eck

ing the

sign

als

on

the

address

tines

(pin

s 10 I h

ru

24 01

Ie

U600) and l

he

d

ata

lines (pins

41

Ihru

56)

usin

g

it

logic probe or

it

scope. II a logic

probe is

USe<!.

refer

to

the

-logic

Chart · for the correct

rea

dings

. II a scope

is

us

ed. the waveforms on

Ihe

address

hnes (except

pms

22

and 23

wh

ich

h,ave

no

Signal In Power Up

mode) sh

ould

be

sim

ilar

to

Figure 1. The

wave/orms

on .he

aata lines shOuld be

simil

ar

10

Figure 2

~,-I

,-I ,-I

,-I

......

...

101

\0

10

....

.-1.-1.-1.-1-'-

, •

10 10

.

10

..

1~.-1~r"r-'-

Y U U

~

•

..

~~r"r-',-I-'-

"

Ii

101

!oj

..

•

Logic

Chart

containing

logic

probe

readi ngs to isol

ate

defect

i

ve

circu

itry

and

components.

L

OG

IC

r

;"")

.

Ie

PI N

Ie

P

IN

IC

Ie

IC

Ie

IC

Ie

NO

.

UIOO

NO

.

UIOO

NO.

UI02 UI03

Ul04

UI05

UI06

UI07\

UIOB

Ul09

I

P

21 P I

L L L

L L 'L

L L

2 P

22

P 2 P P P

P P P P P

3

- ' P

23

P

3

H H H

H

:·H

H

.'

1+

H

-

•

Quick

Comp-onent

Location

using the SAMS exclusive

G

~

IDTRACE,

ORCUITRACE,

and

component

photographs

.

J

K

• ComRlete

Components

Parts List in an easy to use

format

with

field

replacements

shown when possible. SAMS

unique

semiconductor, chip

and

IC cross-reference

gives you

many

replacements to choose

from

and

is

available

af;your Electronic

Distributor.

SEMICONDUCTORS (Select replacement for best results)

REPLACEMENT

DATA

ITEM

TYPE

MFGR

.

GENERAL

No

.

No

.

PART

No

.

ECG

ELECTRIC

MOTOROLA

NTE

PART

No

.

PART

No

.

PART

No

.

PART

No

.

0102

15

553

1149-2576

E

CG5

19

GE-514 IN4935

NTE

519

0103

1

N60FM

1149-2527

EC

G1

09 IN60

NTE109

0201

lN4004GP

12QI-4205 ECGl16 GE-504A lN4QQ4 NTE116

05

01

thru

1555

3

1149-2576

EC

G519

GE-514 lN4935 NTE519

0503

ClRCUIT

RAC

E is a reg

is

ter

ed

trademark

of Howard

'.

'(Sams

& Co.,

Inc

.

CO

MPUTERFACTS

and

G

Rlo

TRAcE

are

trademarks

of

Howard

W

Sams

& Co., Inc.

Commodore

VIC

1525

is

a

Irademark

of

Commodore

Business

Machines

, Inc.

RCA

PART

No

.

SK9091/177

5K

3

088

SK3312

SK90

91/177

WORKMAN

ZENITH

PART

No ..

PART

No

.

WEP9

25/ 519

103-131

WE

P

134/109

103-Z9001

WEP1

57

212-76-02

WE

P925/ 5

19

103-131

To

order, see

your

Sams Representative,

or

telephone

BOO-

.42B-SAMS ..

SM1$,.

Howard W. Sams & Co., Inc.

4300

West

62nd Street,

P.O

.

Box

7092, Indianapolis, Indiana 46206 U.S.A.

CP4

08928

ITT

Commodore VIC-1525 Technical Service Data

Specifications and Main Features

Frequently Asked Questions

User Manual