Commodore 8050 User manual

SERVICE

MANUAL

8050

•

8250

DUAL

DISK

DRIVES

JUNE

1985

PN-314011-03

Commodore

Business

Machines,

Iric.

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

©

1985

by

Commodore

Electronics

Limited.

All

rights

reserved.

CONTENTS

Title

Paa®

SPECIFICATIONS 1

ASSEMBLY ID 2

DOS/CONTROLLER ROMS 2

ACCESSORY PARTS 3

DEVICE

NUMBER

CHANGE 4

CARE & MAINTENANCE 5

POWER UP DIAGNOSTIC

8050/8250

/FLASH CODE 5

TROUBLESHOOTING GUIDE 6

PCB

ASSEMBLY

#8050006

BOARD LAYOUT 8

PARTS LIST 9

SCHEMATIC

10

PCB

ASSEMBLY

#8050044

BOARD

LAYOUT

13

PARTS LIST

14

SCHEMATIC

15

PCB

ASSEMBLY

#8250023

BOARD LAYOUT

18

PARTS LIST

19

SCHEMATIC

20

PCB

ASSEMBLY

#8050002

BOARD LAYOUT

23

PARTS LIST

24

SCHEMATIC

25

POWER

SUPPLY

ASSEMBLY

#8050029

PARTS LIST

28

ASSEMBLY

DRAWING

28

VOLTAGE

CHECKS

28

MICROPOLIS

&

MICRO

SAFARI

DRIVES

RESISTANCE CHECKS

29

PARTS LIST

30,31

WIRING

DIAGRAM

&

LAYOUT

30,31

TANDON

DRIVES

RESISTANCE CHECKS

32

PARTS LIST

33

WIRING & LAYOUT

33

MPI

DRIVES

RESISTANCE CHECKS

34

PARTS LIST

35

WIRING & LAYOUT

35

SERVO BOARD

36

8050

•

8250

DISK

DRIVES

PRODUCT

SPECIFICATIONS

GENERAL

DESCRIPTION

MAXIMUM

STORAGE

MEDIA

INPUT/OUTPUT

CONTROLLERS

MEMORY

DATA

TRANSFER

RATE

FILE

TYPES

COMPUTERS

POWER

REQUIREMENTS

POWER

CONSUMPTION

The

8050

and

8250

are

dual,

5-1/4

inch

floppy

disk

drive

units.

The

8050

uses

a

77

track,

100

TPI,

single

headed

drive.

The

8250

has

double

the

amount

of

tracks,

154,

with

a

100

TPI

double

headed

drive.

They

are

intelligent

devices

containing

their

own

microprocessors,

RAM, ROM

and

operating

system

software.

8050

—

1.05

Megabytes

of

data

(formatted).

Free

Blocks

—

2052

8250

—

2.12

Megabytes

of

data

(formatted).

Free

Blocks

—

4133

5-1/4

inch

floppy disk.

8050

—

single

sided,

double

density

8250

—

double

sided,

double

density

IEEE

Interface

2

MOS

6502

microprocessors

— 1 MHz

clock

4K

RAM,

16K

ROM

400

Bytes/sec

Program,

sequential,

relative,

random-access

and

user

PET,

4000

series,

8000

series,

B128

120

Volts AC,

60Hz

—integral

power

supply with external 1

Amp

fuse

50

Watts

maximum

—

8050

60

Watts

maximum

—

8250

ASSEMBLY

IDENTIFICATION

There

have

been

4

different

drive

assemblies

used

in

the

dual

disk

drive

models

8050

and

8250.

The

various

suppliers

are

listed,

along

with

the

respective

PCS

assemblies

used

in

these

units.

TYPE

DRIVE

/f

ANALOG

#

DIGITAL

#

Micropolis

8050

8050031-01

8050006-01

8050002-01

8250023-02

8250

8250016-01

8250023-01

8050002-04

Microp

Safari

8050

8250039-01

8250023-02 8050002-04

8250

8250039-02

8250023-01

8050002-04

Tandon

8050

8050047-01

8050044-01

8050002-02

8250

8250015-01

8050044-01

8050002-03

MPI

8050

8050059-01/02

8250023-03

8050002-05

8250

8250029-01/02

8250023-03

8050002-06

Please

note

that

the

analog

boards

vary

with

the

drive

assembly

but

the

digital

board

is

the

same

PCB

with

ROM,

CONTROLLER

and

JUMPER

changes.

DOS/CONTROLLER

ROMS

FOR

DIGITAL

PCB

#8050002

DESCRIPTION

PCB

PART

NO.

DOS

CONTROLLER

ROMS

UL1

UH1

UK3

2.5

Micropolis

8050002-01

901482-07

901482-06

901483-03

2.5

Tandon

8050002-02

901482-07

901482-06

901483-04

2.7

Tandon

•*8050002-03

901887-01

901888-01

901884-01

2.7

Micropolis

-8050002-04

901887-01

901888-01

901885-04

2.7

MPI

8050

8050002-05

901887-01

901888-01

901869-01

2.7

MPI

8250

8050002-06

901887-01

901888-01

901869-01

Tcb

part

numbers

8050002-03

and

-04

are

stocked

with

the

appropriate

jumpers

for

use

in an

8250.

Before

installing in

an

8050,

remove

the

two

jumpers.

The

8250

jumper locations are illustrated on the

PCB

layout drawing on page 23.

ACCESSORY

PARTS

REPLACEMENT

CASEWORK

FOR

METAL

UNITS

IS NO LONGER AVAILABLE.

POWER

CORD C

903501-01

DEMO DISKETTE

8050

C

8050050-01

DEMO

DISKETTE

8250

C

8250002-01

USER'S

MANUAL C

320899-01

INTERFACE

CABLES:

IEEE

TO

IEEE C

905080-01

PET

TO

IEEE C

320101-01

HARNESS

ASSEMBLY

POWER

ANALOG

C

320814-01

RIBBON CONNECT CABLE C

903000-01

THE

8050/8250

DEVICE

NUMBER

The

8050/8250

disk

drives

have

been

assigned

device

#8

on

the

IEEE-488.

However,

it is

possible

for

the

digital

board

to

be

altered

to

select

device

numbers

8

thru

15.

At power-on reset,

the

three

pins

22,

23

and

24

of

the

6532

at location UEl are read

as

a binary

input. The

factory

supplied board

has

the

pins tied

to

ground,

so

the

inputs

will read

as

binary O's.

By lifting

one

or a

combination

of pins,

this

input

can

be

altered.

The

corresponding

input

will

read

as

a binary 1

and

is

added

to

the

base

device

number

of 8

to

derive

the

final

device

number.

All

subse

quent

communications

will

use

this

computed

device

number.

To

compute

the

desired device

number

consider

that

24

is

the

least

significant bit

and

22

is

the

most

significant

bit. For

example,

to

select

device

#

9,

24

would

be

cut

and

the

input

would

be read

as

8

-i-

1

=9.

Lifting

the

remaining pins or

combinations

of pins will result in

the

additional

device

number

selections.

QDaDDDO

DDDD

DDOOD

DODD

DO

ODOO

DO

0

nnn

D

DEVICE

CHANGE

LOCATION

PAD/PIN

JUMPER-0

TTT

cuT-1

4 2 1

ADDRESS=8+PIN

VALUE

CARE

AND

MAINTENANCE

• DO

NOT

use

MAGNETIZED

tools

when

repairing

or

adjusting

a

disk

drive.

• DO NOT

place

a

disk

drive

near

any

device

which

generates

"noise"

e.g.,

—

motors,

radios,

televisions.

• DO NOT

stack

drives

upon

each

other

or in

any

way

inhibit air

flow

around

the

unit. HEAT

BUILD

UP

can

cause

disk

failures.

• Periodically

CLEAN

the

read/write

head

with

90%

isopropyl alcohol

and

a

cotton

swab.

CHECK

load

pad

for

excess

wear.

Clean

or

replace

as

necessary.

•

Take

the

following

precautions

when

handling a

diskette:

ALWAYS

store

a

diskette

in

its

jacket.

Use ONLY felt-tip

pens

when

writing on

the

label of a

diskette.

Do

not

bend

or

physically

damage

a

diskette.

Do

not

place

a

diskette

in

the

area

of a

magnetic

field.

Do

not

attempt

to

clean

a

diskette.

Do

not

touch

the

exposed

area

of

a

diskette.

DIAGNOSTIC

and

ADJUSTMENT

procedures

are

outlined

in

the

diagnostic

disk

and

manual

package.

Order

Part

#314052-01

Version

3.0

&

3.5

Diagnostic

Package.

POWER

UP

DIAGNOSTIC

FOR

8050/8250

FLASH

CODE

On

power

up,

the

three

LED's on

the

drive

should

blink.

The

drive LED's

go

off

and

the

center

Tri-

State

LED

remains

green.

The

sytem

has

a built in

self

diagnostic

which

can

be

read

in

the

form of

a

flash

code.

In

the

event

of

a failure,

the

3 LED's will blink in a

repetitive

sequence.

The

number

of

blinks

between

intervals

will

indicate

the

possible

location

of

a failure.

ERROR

INDICATIONS

NUMBER

OF

FLASHES

ERROR

CAUSE

COMPONENT

/LOCATION

1

Zero

Page

6532

UC1,UE1

2

ROM

$EOOO-$EFFFF

2364

UL1

3

ROM

$COOO-$DFFFF

2364

UH1

4

Unused

5

Zero

Page

6530

UK3

6502

UH3

6

Common

RAM

$1000-$

13FF

2114

UC4,UC5

7

Common

RAM

$2000-$23FF

2114

UD4,UD5

8

Common

RAM

$3000-$33FF

2114

UE4,UE5

9

Common

RAM

$4000-$43FF

2114

UF4,UF5

10

Controller

ROM

6530

UK3

6502

UH3

If

the

LED's

come

on

and

stay

on,

the

microprocessor

UNI is

probably

at

fault.

TROUBLESHOOTING

GUIDE

NOTE:

Always

check

for

latest

ROM/ECO

upgrade,

refer

to

schematic

notes

and

ROM

chart.

If

socketed

IC is

suspected

bad,

be

sure

to

check

socket

with

ohmmeter.

SYMPTOM:

POSSIBLE

SOLUTION:

No

LED's

on

power

up.

Is

Power

cord

plugged

into

wall

outlet

correctly?

Is

Power

cord

plugged

into

the

disk

drive

correctly?

Check

line

fuse.

Check

power

switch.

Check

clock

on

6502

37.

Check

+5

and

+12

volt

lines.

Flash

code.

See

power-up

diagnostic

on

page

5.

Device

not

present

message

appears.

Check

for

device

number

change.

Check

UA2

(7414)

and

the

ATN

line

on

the

IEEE.

Check

UB1, UB2,

UD2

(MC3446).

AC

ripple

in 5

or

12

volt

lines.

Check

power

supply

filter

caps.

No

reset

pulse.

Check

565

and

on digital

board.

Motor

won't

run

and

head

does

not

move.

Check

UM3

(6522).

Check

UJ2

(741

sOO).

Check

+12

voltage

sources.

One

or

both

drive

motors

run

continuously.

Check

+12V.

Check

UH3,

6522

and

logic

gates.

Check

ROMs.

Loads

programs

with

red

error

LED

flashing.

Check

drive

speed.

Check

stepper

motor.

Check

drive

alignment.

Check

controller

ROM

UK3.

Loading

is

intermittent.

Check

ROMs.

Check

drive

speed.

Check

drive

alignment.

Does

not

load

when

hot.

Check

ROMs.

Locks-up

when

loading.

Check

IEEE

components.

Check

ROMs.

Message

of

'FILE NOT

FOUND'

is

displayed.

Clean

drive

head

w/alcohol.

Check

read

circuits.

Check

alignment.

Drive

fails

to

read.

Check

the

311,

9602,

592's,

etc.

on

analog

board.

Check

stepper

and

drive

motors.

TROUBLESHOOTING

GUIDE

(Continued)

SYMPTOM:

POSSIBLE

SOLUTION:

When

loading

a

program,

the

time

is

excessive

and

stepper

motor

is

heard

(bump

sound)

a

number

of

times.

Check

that

the

diskette

is

centered

properly.

Check

drive

speed.

Check

drive

alignment.

Data

file

error.

Check

GCR

ROM

UK6.

Appears

to

load

but

won't

run.

Check

6532's.

Check

UK3

controller

ROM.

Won't

format/write.

Check

write

protect

tab

in

disk

and

switch

on

drive.

Check

write

circuitry

on

analog

board.

Check

write

enable

on

digital

board.

00

CR33a

CR35

oooooooeoooooooo

a

0-

oR74o

® 1380

MADE

ORN

O

COMMODORE

U.S.A.

^R22CR26

OODDD

ORU

C42o

.(S

mm

0R170

OR24 0

BOARD

LAYOUT

PCB

ASSEMBLY

#8050006

D

O TP3

DD

~S0i30

DD

(D

.K

D

oRiie

OCRIB

eR33o

0

fl >

ecRio

0

eR310

OCR13

PARTS

LIST

PCS

ASSEMBLY

#8050006

PLEASE

NOTE:

Commodore

part

numbers

are

provided

for

reference

only

and

do

not

indicate

the

availability

of

parts

from

Commodore.

Industry

standard

parts

(Resistors,

Capacitors,

Connectors)

should

be

secured

locally.

Approved

cross-references

forTTL

chips.

Transistors,

etc.

are

available

in

manual

form

through

the

Service

Department,

order

part

#314000-01.

Unique

or

non-standard

parts

will be

stocked

by

Commodore

and

are

indicated

on

the

parts

list by a

"C".

Vendor

Name

and

part

number

have

been

provided

for

your

convenience

in

ordering

custom

or

unique

parts.

INTEGRATED

CIRCUITS

U1

311

U2,3

592

U4

74LS86

US

Q2T2905

Trans

Pk

U6

74LS74

U7

9802

U8

555

U9

7417

U10

74LS14

U11

74LS32

U12

741

U13,14

FPQ3724

Trans

Pk

U14,16

7406

U17

741

U18

74LS139

TRANSISTORS

Q1,2

TIP110

Q3,4,5

2N4400

DIODES

CR1-3

1N4446

CR4

1N5226

B

3.3V

Zener

CR5-17

1N4446

CR19,20

1N4446

CR21

1N5235

B

6.8V

Zener

CR22,

23

1N4002

CR24

1N4446

CR25

1N5235

B

6.8V

Zener

CR26.27

1N4002

CR28-35

1N4003

CR36,37

1N4446

RESISTORS

— All

Values

are

in

ohms-

1/4

W

5%

unless

noted

otherwise.

R1

22K

R27

3.16K

1/4W,

1%

R2,3

150

R28-31

12K

R4

100

R32,33

27K

R5,6

470

R34

IK

R7,8

2.2K

R35

17.4K

1/4W,

1%

R9

510

R36

6.19K

1/4W,

1%

RIO

330

R37

12K

R11

18K R38

IK

R12,13

IK

R39.40

220

R14

330

R41

10K

R15

270

R42

47K

R16

IK

R43

IK

R17

1.5K

R44

470

R18

560

R45

IK

R19

IK

R46

470

R20

1.5K

R47

1

1/2W,

5%

R21

IK

R48

150K

R22

1.5K

R49

270

R23

2.2K

R50

5K

Potentiometer

R24

22K

R51

10K

R25

3.16K

1/4W.

1%

R52

12K

R26

22K

R53,54

IK

RESISTORS

(Continued)

R55

220

R67

IK

R56

47K

R68

470

R57

IK

R69

1

1/2W,

5%

R58

150K

R70,71

IK

R59

270

R72

47K

R60

10K

R73

220

R61

5K

Potentiometer

R74

IK

R62

10K

R75-82

750

R63

12K

R83

6.8K

R64

47K

R84

390

1/2W,

5%

R65

IK

R85

180

R66

470

CAPACITORS

C1

CER

2200pF,

50V

C2

CER

750pF,

50V

C3,4

CER

.47ttF,

50V

C5

CER

.VF,

50V

C6,7

CER .022mF,

50V

C8

CER

330pF,

50V

C9

CER

470pF,

50V

C10

CER

150pF,

50V

C11

CER

470pF,

50V

C12

CER

.IttF,

50V

C13

CER .047#.F,

50V

C14,15

CER

.luF,

50V

C16,17

TANT

3.3;J=,

25V

C18

CER

.luF,

50V

C19

TANT

3.3uF.

25V

C20

CER

.IttF,

50V

C21

TANT

3.3uF.

25V

C22

MONOLITHIC

1/iF,

50V

C23

CER

.IttF,

50V

C24,25

ELECT 220/tF,

16V

C26

TANT

3.3itF,

25V

C27

CER

.IttF,

50V

C28

TANT

3.3itF,

25V

C29

CER

.1;iF,

50V

C30

TANT

3.3uF,

25V

C31

MONOLITHIC

1^,

50V

C32

CER

.1;iF,

50V

C35-40

CER

.IttF,

50V

C41

CER .47mF,

50V

C42

CER

47pF,

50V

MISCELLANEOUS

LI

,2

RF

Shielded

Choke,

100/iH

L3,4

RF

Shielded

Choke,

27,tH

L5.6

RF

Shielded

Choke,

10/tH

L7

RF

Shielded

Choke,

100/tH

PI

,3

Header,

St.

Post,

5 pin

P5

Header,

Rt. Angle,

16

P6

Header,

5 pin,

.156

center

P7

Header,

Dual

Row

20

pin, .1

center

P8

Header,

Rt. Angle,

16

DHV

SEL

DRV

SEL®

WRITE

CRI

IN4440

CflZ

|KM44^

♦12

VP

*»CR4-

iNszzse

2.

ALL

CAPACaOR

VALUES

ARE

IM MICROFMUOS

AMD ARE

SO

VDC.

I. ALL

RESISTOR

VALUES ARE

tKJ

OHMS

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PARTS

LIST

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ASSEMBLY

#8050044

PLEASE

NOTE:

Commodore part numbers are provided for reference onlyand do not indicate the availabilityof parts from Commodore. Industry standard

parts (Resistors, Capacitors, Connectors) should be secured locally. Approved cross-references for TTLchips. Transistors,

etc.

are available

in manual form through

the

Service Department, order part

#314000-01.

Unique or non-standard parts will be stocked by Commodore

and are indicated on the parts list by a

"C".

Vendor Name and part number have been provided for your convenience in ordering custom

or

unique

parts.

INTEGRATED

CIRCUITS

U1

U2

U3,4

U5

U6

U7

U8

ug

U10

U11

U12

U13

U14

U15

U16

U17

U18

U19

U20,21

U22

U23

74LS74

ULN2074

8

Trans

Pk

741

C

ULN2074

8

Trans

Pk

75462

7404

75462

9602

75462

74LS86

77462

7404

75462

74123

7406

7404

75462

311

592

75462

Q2T2905

Trans

Pk

TRANSISTORS

Q1

Q2,3

Q4.5

Q6,7

Q8,9

DIODES

CR1.2

CR3.4

CR5

CR6-15

CR16

CR17-24

CR26

CR27

CR28-53

CR54

2N4400

TIP110

2N4400

2N4403

2N4400

1N4446

1N4005

1N5235

8

6.8V

Zener

1N4005

1N5235

8

6.8V

Zener

1N4005

1N4446

1N5226

8

3.3V

Zener

1N4446

1N5234

8

6.2V

Zener

RESISTORS

-

All

Values

are

in

ohms-

1/4

W

5%

unless

noted

otherwise.

R1,2

R3

R4

R5,6

R7

R8,9

R10-14

R15

R16-18

R19

R20

R21

R22,23

R24

R25

R26

R27,28

R29

R30

R31

R32,33

10

2W,

5%

180

5K

Potentiomete

150K

180

10

IK

10K

IK

6.8K

470

IK

1

10K

IK

470

3.3K

270

10K

18K

3.3K

2W.

5%

1/2W,

5%

R34

35

36

R37

R38

R39

R40

R41

R42

R43

R44.45

R46

R47.48

R49

R50

R51,52

R53

R54

R55

R56

R57-59

47K

12K

IK

470

12K

47K

IK

470

6.8K

270

3.3K

6.8K

3.3K

12.4K

IK

330

470

330

IK

1.2K

IK

1/8W,

1%

RESISTORS

(Continued)

R60

12K

R61

330

1/2W,

5%

R62

IK

R63

30.9K

1/8W,

1%

R64

5K

Potentiometer

R65

1.54K

1/8W,

1%

R66

768

1/8W,

1%

R67

1.3K

1/8W,

1%

R68

768

1/8W,

1%

R69

270

R70

180

R71

IK

R72

360

R73

IK

R74

1.5K

R75

470

R76-79

IK

R80

15K

R81

19.6K

1/8W,

1%

CAPACITORS

C1

TANT

C2,3

CER

C4

TANT

C5

CER

C6,7

TANT

C8

CER

C9,10

TANT

C11

CER

C12,13

TANT

C14

CER

C15

TANT

C16-25

CER

C26

CER

C27

CER

C28,29

CER

C30,31

CER

C32

CER

C33

CER

C34

CER

35,36

CER

C37,38

CER

C39-41

CER

C42,43

CER

C44

CER

C45

CER

C46

TANT

C47

TANT

C48

CER

C49

CER

C50

CER

C51

CER

C52

TANT

C53

CER

C54

CER

C55

CER

C56

CER

C57

TANT

C58

CER

C59-63

CER

MISCELLANEOUS

R82

3.16K

1/8W,

1%

R83

19.6K

1/8W,

1%

R84

12K

R85,86

8.25K

1/8W,

1%

R87-90

12K

R91,92

2.2K

R93

47K

R94

1.5K

R95

IK

R96

1.5K

R97

IK

R98

1.5K

R99

IK

R100

1.5K

R101

IK

R102

2.2K

R103

IK

R104

8USSWIRE

3.3|(F

.OI/tF

3.3/iF

.01/xF

3.3/tF

.01/tF

3.3/iF

.OI/tF

3.3mF

.01/xF

3.3/tF

.01/iF

150pF

.01/xF

1/iF

.01/xF

47pF

.01/xF

.1/xF

,01/xF

470pF

.01/xF

.1/xF

.01/xF

.1/xF

4.7/xF

.01/xF

470pF

.1/xF

330pF

4.7/xF

.1/xF

.01/xF

68pF

470pF

4.7/xF

.47/xF

.01/xF

15V

50V

15V

50V

15V

50V

15V

50V

15V

50V

15V

50V

200V

50V

200V

50V

200V

50V

35V

16V

50V

200V

50V

200V

16V

50V

200V

35V

50V

LI

,2

L3

15,6

P3

P5.6-A,8

P4-21-A,8

P7

P8

RF

Shielded

Choke,

10/xH

RF

Shielded

Choke,

100/xH

RF

Shielded

Choke,

390/xH

Header,

5

pin,

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156

center

Header,

Rt.

Angle,

10

Header,

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23

Header,

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