Panasonic JU-475-4 Manuel utilisateur

ORDER NO. MSD891122000

erviceManual

Flexible Disk Storage Drive

JU-475-4

Panasonic

10.

11.

12.

13.

14.

15.

16.

17.

18.

CONTENTS

PART I

INTRODUCTION

.••..•..•••.•.•••..•..••••••.••••.•••••.••.••••..••••••••••••••••••••••••••••••••••

MODELS

AND

MODEL

NUMBERS

•.•••••••••••••••••.•••••.••••••.••••••••••••••••••••••••••••••••••

2.1

5.25inch

FDD

Series .

SPECIAL TOOLS

•••.•••.••••••••••.•••.•••••••••••••.•••••.••••••••••••.•••••••••.•••••••••••.•••••

OUTLINE

MAINTENANCE

•.••.••••••.•••••••••••.•.•..••••••.•.•••••••••••••••...••.••.•.••.•••.•

4.1

Alignment

Diskette

4.2 Exerciser .

DIAGNOSTICPROCEDURES

.•••••••.••..••••••••••.••••••••.••.••.•••••••••••.••••••••••••••••.•••.•

5.1

ErrorSymptom Recognition .

5.2

Soft Error

Detection

and Correction .

5.3

Write

Error .

5.4 Read Error .

5.5

Seek Error .

5.6

Interchangeability

Error .

TROUBLE

ANALYSIS

•••.•••••.••••..•.•.•••••••••••..••.••.••.••...••••..••••••••••.•••••••••.•••••

6.1

Trouble Analysis Procedure .

6.2 Troubleshooting FlowChart .

6.3 Trouble Analysis Table .

PREVENTIVE

MAINTENANCE

..•••••••.•••.•••••••••.•.••••.•••••.•••••••••••••••••••••••••.••.•••••

SPECIFICATIONS

.•.•.•••••••••.•••••...••.••.••..••••••••.••.•.••••••••.•••••••..••.••••••••..••••

ADJUSTMENTS

AND

VERIFICATIONS

••..••.•.•••.•••..•.••••.•••••••••.•...•••••••••.•••.•••••••••.•

9.1

Motor

Speed

Verification

(Index Period) .

9.2

Write

Protect

Verification

9.3 Head

Output

Verification

9.4

Output

Modulation

Verification .

9.5 Resolution

Verification

9.6 Radial

Alignment

Verification

and

Adjustment

9.7

Azimuth

Verification

9.8 Index Burst

Verification

and

Adjustment

9.9 Track 0Sensor

Adjustment

9.10

Asymmetry

Verification

TEST POINTS

••.••..••••••••..••••..•••.••.•.••••••••••..•.•.••••••••••••••••.•.••.•.••••••••.••••.

PANASONIC

ALIGNMENT

DISKETTE

.••..••••••••••••••.••••..••••••.••.••..•.•.••.••.•••••••••••••••

PART"

REMOVALS

AND

INSTALLATIONS

••.••..••••••••••••••••••.••••••.••••••••••••••••••.••..•••.•.•••••

12.1

PCB

Removal and Installation .

12.2 Front Plate

and

Handle Removal

and

Installation

12.3 Track 0Sensor Removal and Installation .

12.4 ColletAssembly Removal, Installation, and

Adjustment

12.5 Clamp Assembly Removal

and

Installation .

12.6

Write

ProtectSensor Assembly and Index Sensor Assembly Removal and Installation .

12.7 Cartridge Guide Assembly Removal and Installation .

12.8 Stepper

Motor

Assembly Removal and Installation .

12.9 Head Carriage Assembly Removal and Installation .

12.10 Drive

Motor

Removal

and

Installation

12.11

LED

Assembly Removal and Installation .

12.12

Lifter

Unit

Removal and Installation .

12.13 Media

Lifter

Removal

and

InstaHation _

. _ . _ _

12.14 Media Sensor Assembly Removal

and

Installation .

EXPLODED

VIEW

•..•...................••..•..•.•••.•••.•.••••••.••••....••••••••••••••.••••.•••••

REPLACEMENT PARTS LIST

.•.••••...••..••.•••••••••..••••.••.••••..•••••••••••••••••.•••••••.•••••

REPLACEMENT PARTS LIST FOR

PCB

•.•.•••••.••••...••.•••••••.••.••.•••••.•••.••.••.•••••••••••••.•

SCHEMATIC

DIAGRAM

..••...•..•.••.•••.••••••••••.•••••.•••••.•.••••••••••..••..•.••..•.••.•••••

CIRCUIT

BOARD

.••.•..•..••••.•••..•.•.•.••.•••••.•.•.•••.•.••..•••••.••..••••••.•••••••••••.••••.

BLOCK

DIAGRAM

•.•.•••..•..••••..•...••••••••••••••••.•.••••••.••••••••••••.•.•••.••••••••.••••.

-1-

Page

18-

25-26

28-29

PART. I

1. INTRODUCTION

This service manual consists

two

parts, Part Icovers

maintenance

description,

adjustment

procedures, and

trouble

analysis

and

Part

covers disassembly and reassembly procedures, parts

list, and

PCB

circuits.

Part Iencompasses maintenance instructions

for

all Floppy Disk Drive

(FOO)

models. Refer

the

highlighted

applicable items, and

perform

maintenance

work

the

FOD.

Note:

This service manuals

prepared

for

maintenance

the

FOO.

not

use

this

manual

for

judging

pass

fail

criteria

inspections.

2. MODELS

AND

MODEL NUMBERS

48TPI

-c

JA-551

JU-455

2.1

5.25inch

FDD

Series

Itlill

SPECIAL TOOLS

96TPI JA-56X

-c

JA-560

JA-561

JU-58X

-c

JU-581

.JU-585

JU-595

JU-465

~~~1~lgtl!l:l~111[

The

following

special

tools

are used

for

FDO

maintenance.

Table 3 - 1 Special Tools

Part No.

Tool 5.25 inch (48TPI)

ilil!llll!i!l!illill!III!!!I!!il!!I!!!!!I!II!!!II!II~1!lj!~I!f~I!!~!iIIJI!I!!!I!ll!!I!!!I!!I!!i!!!llil!!i!!!i!!!!~l!l!i!!!!!

Qua

ntity

JA-551/

JU-455

JA-561/

JU-465

i!l!lil!9fiilllrl~lllgI111~!11!1

FOD-EXT-35Exerciser

Alignment

diskette

Data

diskette

Oscilloscope (50 MHz)

Probe(10:

Frequency

counter

817-128

817-560

2DO

1-2

Note:

*~:

Stand

for

the

same

left.

-1

4. OUTLINE

MAINTENANCE

•The

following

tools

are required

for

maintenance

FDD.

4.1

Alignment

Diskette

Alignment

diskette

used

for

head

actuator

alignment

and indexsensor adjustment.

Use

the

right

diskette

shown in Table 8.1.

4.2 Exerciser

The exerciser enables you

make all adjustments and inspections necessary

for

FDD.

Its

functions

include

the

following.

(1) Seek

increment

alternate

tracks

(2)

Read

(but

data compare)

(3)

Write

1For2F(AII

"O"sor"1"s)

(4) Head load (5.25inch

FDD

with

optional

head loader)

(5) Recalibration

track 0

The exerciser

has

switches and indicators

execute aspecified

function.

5. DIAGNOSTIC PROCEDURES

5.1

Error Symptom Recognition

Errors

that

occur because

the

wrong

operating

procedure,

wrong

programming,

the

use

defective

diskette,

soft

errors due

external

causes,

such

contaminated

air

and random

electrical noise, are

often

attributed

FDD

failure.

Unless avisual inspection

the

FDD

reveals an

evident

assembly

fault

adefect, always

confirm

errors

with

another

good diskette, and

another

known

good

FDD.

5.2 Soft Error Detection and Correction

Soft

errors are

normally

caused

the

following.

(1)

Contamination

between

read/write

heads and diskette. This

kind

contamination

can be

easily

eliminated

the

liner

the

diskette.

Please

the

appropriate

procedures

provided

with

the

cleaning diskette.

(2) Random electrical noise,

normally

few

microseconds

less.

(3) Small defects

written

data

and/or

track

not

detected

during

write

operation

may cause

soft

errors

during

read.

(4) Faulty

grounding

the

FDD

host system can also

cause

soft

errors.

(5)

Wrong

motor

speed

another

cause

soft errors.

Take

the

following

steps on

the

controller

side

recover

from

the

soft

errors mentioned

above.

(1)

Read

the

track

again

ten

times

until

the

data

recovered.

(2)

step (1) above fails

recover

the

data,

access

the

adjacent track. Then

return

the

head

the

original

track.

(3) Repeat step (1).

(4)

Any

error

that

cannot be corrected

the

above procedure

irrecoverable.

5.3

Write

Error

error

occurs

during

write

operation,

usually detected

during

the

revolution by

performing

aread

operation

called

write

check.

correct an error,

write

again and repeat a

write

check

operation.

the

result

unsatisfactory

after

ten

write

operations, perform a

read

operation

another

track

determine

whether

the

diskette or

the

drive

that

wrong.

error

persists, replace

the

diskette and repeat

the

above procedure.

the

error

still persists, assume

the

FDD

defective.

the

error

corrected,

the

diskette

defective.

can be

thrown

away.

5.4 Read Error

Most

read errors are

soft

errors. Data can be recovered by

following

the

recovery procedure in

section 5.2.

5.5 Seek Error

Seek errors are caused by

the

following.

(1) Stepper

motor

stepper

motor

drive

circuit

faulty.

(2) Faulty Carriage

There are

two

ways

recover

from

aseek error. One

recalibrate

track

and seek

back

the

original

track. The

other

read

the

field,

check

the

track

number

which

the

head

located, and move

the

head

away

from

it.

Read

again.

5.6 Interchangeability Error

Data

which

written

one

FDD

may

not

be read

another.

This

error

called

interchangeability

error,

which

can be caused mostly by

the

following

reasons,

which

should be

checked

follows.

(1) Head

misalignment:

Refer

Adjustments

and

Confirmation

section 9.6.

(2) Head

output

too

low:

Refer

Confirmation

section 9.3.

(3)

Motor

speed

difference:

Refer

Adjustments and

Confirmation

section 9.1.

(4) Format

incompatibility.

TROUBLE

ANALYSIS

determine

the

cause

trouble

whether

lies in

the

FDD,

diskette,

controller,

replace

the

diskette and

the

FDD

with

good ones.

the

FDD

assumed

faulty

result,

the

procedure

below.

6.1

Trouble Analysis Procedure

FDD

trouble

may occur in any

the

following

ten

forms.

(1) Index

detection

failure

(2) I/O 34pin signal

failure

(Disk Change /Ready /Media

Media

Out)

(3) Track 0

undetectable

(4) No seek

(5) No

write

(6) No read

(7)

Read

error

(8)

USE

LED

won't

light.

(9)

Write

protect

undetectable

(10) No head load (S.2Sinch

FDD

with

optional

head loader)

Check

with

the

troubleshooting

flowchart

in section 6.2.

CAUTION:

sure

switch

the

power

off

before

removing

FDD

PCB

from

the

operating

system.

6.2 Troubleshooting Flow Chart

Table 6 - 1 Troubleshooting Flow Chart

YES

Check

Item

Table 6-2

Check

Item

Table 6-2

Check

Item

Table 6-2

Check

Item

Table 6-2

Check

Item

Table 6-2

Check Item 10,

Table 6-2

Diskette

Defective

Controller

Defective

Check Item 1,

Table 6-2

Check Item 2,

Table

6-2

Check Item 3,

Table

6-2

Check Item 4,

Table

6-2

PowerSW

DCSWOn

Drive Select

Head load

Run

the

operating

system and

check. Record all diagnostic

information

on tracks and sectors

far

the

program permits.

-4-

6.3 Trouble Analysis Table Table 6-2 Trouble Analysis

Item

Trouble

Index

detection

failure

I/O 34pin signal

failure

Track 0

detection

failure

No head

No seek

write

No read

Read

error

USE

LED

won't

light

Write

protect

failure

No.

Cause

Collet

part

faulty

Drive

motor

control

PCB

Drive

motor

faulty

Index

LED

faulty

Index

detector

faulty

Index LED/index

detector

installation

faulty

PCB

motor

circuit

PCB

index

detection

circuit

See

Item

PCB

disk chanQe /ready/

Media

in/

Media

out

ciuciit

Track 0assembly

PCB

track

detection

failure

See

Item

See

Item

Head load solenoid

PCB

head load

rcu

Stepper

motor

Guide

shaft

contamination

damaQed

PCB

stepper

driver

circuit

See

Item

See

Item

Head disconnected

Head shorted

Head load bail

height

wrong

PCB

write

circuit

See

Item

See

Item

See

Item 6.

PCB

read

circuit

See

Item

See

Item

See

Item

Alignment

Azimuth

Index

burst

Asymmetry

Limiter

Track 0

Head

load

time

Index

neriod

PCB

read

rcu

LED

part

PCB

USE

circuit

Write

protect

part

Write

protect

circuit

-5-

7. PREVENTIVE

MAINTENANCE

preventive maintenance

necessary

for

any FDD

under

normal conditions.

However

adjustments

are

necessary,

the

procedures in this manual must be

followed.

•Adjustments (Refer

Table 8-1)

(1)

Make

read/write

head radial adjustment

the

specified track. (Sides 0,

(2)

Make

an index burst

adjustment

the

specified track. (Sides 0, 1)

(3)

Make

azimuth

measurement

the

specified track. (Sides 0, 1)

CAUTION

not

write

when

using

alignment

diskette. Check

that

write

protect sensor

properly

operating

with

data

diskette.

Note:

Section 9describes

the

adjustment procedure in detail.

8. SPECIFICATIONS

Table 8-1 Specifications

MINI

(a)

type

Drive

motor

dual speed type.

Item

Parameter

10 Head load

time

MINI

((3)

type

Drive

motor

fixed speed type. (360 rpm)

Item

Parameter

Index period

Output

level

Modulation

Resolution

Radial AliQnment

Azimuth

Index burst

Track 0

Asymmetry

Head load

time

jjI~j::j~jj;~j!~;jj!~j~~~jj~~j:I::~:~~j~j:II~j:!~:I:(~I;!j:~~j:1::

~j~I;::)!j::iI:::::J1:ljtj:l:Y:::EI?!;;4:lfe@;~::j:i:~~Ijj:/j~Ij::~~tiI:I:jj~:j:j~~:j:~~;::!:~I:~ti~j;~~j:)::j:ir:~~~~;~;j~:~j;:jtIj;~:j

'I:

';;\\~\jIj~~~~::]:j~[:~I\\~\j~\~\I\\~\~I'N'~~~lrfjnqg~,

:\:tmt~\1\\j:::j\\:j~j):~~}\)\~t:

~:)::\\:~:j\~]Ij\j]~]\\;~~\j\\)\\~\\\\;:n\~V~~*j'::f.'Jng#@')]]])\~)\j)II\\\)~\j\\)]\~)j\\\~\\::)j]j;

;',;\j~II~~t~::

fI]~A¢~<jI::::;:It}

.:j\~;~:~j\t~::~t

:g$t,v.:':{:~t::;j~:;~:~I:

':i{:t:~:~I~~;:'j~ijl~~:::~~~~~:::~}~:::~:~:;:

';~~j:t:::~j:~::\:IMlt~tl::~~ttjjI

";:::

;)t::?:t:rt::~,:

3.2trmftttt:

::'

:t::/I/}:df

1:~1%;'

.;::

::,:.::

~:':'.'

<::/J},::~;":::t':\fi"

;::)/':::'::::/f:::

.)::~~:{~:):;:}:,

:::~$t

})}

::,::\r.:'

.:.

.:'

!:jI(1??'::

,.:~~jtIIIIt:}

/t/?

:::::}:

±{J

ak:{',·,:.·::·::;i':,,·:,

.:::;.}}(::::::

:J/::wi:

':{'i:'

.;;/ii:i;

:,;::

';?:::~::::'?:;::,;'

':::

....

:,:~:,·/?:t

:::::

.~:

-6-

9. ADJUSTMENTS

AND

VERIFICATIONS

9.1

Motor

Speed Verification (Index Period)

(1) Insert adiskette, run

the

motor,

and clamp. Refer

the

index period column

Table 8-1.

(2) Step

the

specified track.

(3) Connect afrequency

counter

the

INDEX signal:

TP7

(4) Check

that

the

frequency counter readings

meet

the

specifications

Table 8-1.

9.2 Write Protect Verification

(1)

Check

that

the

exerciser's

write

protect

lamp

goes on and

off

adiskette

inserted and

removed

specified in

the

table

below.

Diskette

with

write

protect

Diskette

with

write

protect

hole open hole closed

OFF

(Not

write

protected) (

write

protected)

9.3 Head Output Verification

Use

new

diskette

possible

identify

head

failure

for

this check.

(1)

Insert agood diskette.

(2)

Run

the

motor.

(3) Step

the

track specified in

the

output

level column

Table 8-1.

(4) Connect

the

oscilloscope probe

specified below.

CH1

CH2

EXT

·:·:II\~~I~I!:II!I:II~~:jll~I~I!\:~:\.I::.I:~1111:!!:.:

Invert channel 2and select

the

Add mode.

Set vertical

deflection

mV/division and horizontal

deflection

ms/division.

(5)

Write

(all "1"s) on

the

entire circumference.

(6) Check

that

the

average

output

level meets

the

specifications

Table 8-1.

v - Vmax +Vmin

average

-2

does

not

meet

the

specifications,

refer

Item 7

the

Trouble Analysis Table.

-7-

9.4

Output

Modulation

Verification

Modulation

calculated by

the

following

formula.

Modulation

max

Vmin

x100{%)

::;

max

Vmin

Using

the

value obtained

section 9.3, and check

that

the

calculated value meets

the

specifications

Table 8.1.

±m4#¥4.!§BZ=±4i-

Maximum

voltage Value: Vmax

mll~

...

¥.:::m:;:~;:;~::::~;;;m;{t==

Average

Voltage

:::;:;:;:

:-:

Minimum

Voltage Value: Vmax

Fig. 9-1

Modulation

9.5 Resolution Verification

(1)

leave

the

oscilloscope

the

same

condition

mentioned

section 9.3.

(2) Resolution

calculated by

the

following

formula.

Resolution =

V2F

average x100

(%)

Faverage

(3) Check

that

the

calculated value meets

the

specifications

Table 8-1.

9.6 Radial

Alignment

Verification

and

Adjustment

Introduction

This

adjustment

normally

not

necessary.

the

mounting

screws

for

the

stepper

motor

loosen,

parts

become

defective,

compatibility

error

occurs, check and readjustaccording

the

following

procedure.

Steps(4)

(9)

below

should be

performed

regardless

the

type,

DAD

alignment

diskette

used.

Use

alignment

diskette suitable

the

type

FDD

be adjusted according

Table 3-1.

(1) Insert Panasonic

alignment

diskette.

CAUTION:

sure

leave

the

alignment

diskette

under

room

conditions

for

minutes

before

adjustment.

(2) Step

the

track

specified

the

radial

alignment

column

Table 8-1.

(3)

leave

the

oscilloscope in

the

same

condition

mentioned

section 9.3.

•Cats

Eye

System

(4) Check

the

output

waveforms

for

sides 0and

They should

appear

in Fig. 9-2.

(5) The

two

waveforms should appear in

the

amplitude

ratio

the

radial

alignment

column

Table

8-1

better.

(6)

the

specified

ratio

not

satisfied, loosen

the

two

mounting

screws

for

the

stepper

motor.

-8-

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