Fujitsu M255XK Customer Engineering Manual

5

1

;4"

M255XK

Mini-Flexible

Disk

Drive

Customer

Engineering

Manual

TS021-013087

FUJITSU

...

01

70221

Rev.

A

REVISION RECORD

Edition

01

Direct

your

Date

Published Revised

April 1987

comments

on

Initial

this

publication

Contents

Fujitsu

America

Release

to:

FUJITSU AMERICA,

3055 Orchard Drive

San

Jose,

CA

95134 USA

INC.

TEL: (408) 432-1300 FAX: (408) 432-1318 TLX: 230-176207 TWX:

(910) 338-2193

The

contents

of

this

manual

are

subject

to

change

without

All

Rights

Reserved

ii

prior

notice.

TS-021-013087

•••

01

70221

Rev.

A

LIST

OF PAGES

WITH

REVISION

LEVEL

Page

Cover

i ii

iJi

iv 01 v vi vii

1-1 1-2 01 1-3 2-1 01 2-2 2-3 2-4 2-5 2-6

3-1 3-2 3-3 3-4 3-5 3-6 01 3-7 01 3-8 3-9 3-10 3-11 3-12 3-13

Rev

01 01 01 01

01

01 01

01 01 01 01

01

01 01

01 01 01 01

Page

4-1

Rev

01 4-2 01 4-3 4-4

01

01 4-5 01 4-6 01 4-7 01 4-8 4-9 4-10 4-11 4-12 4-13 4-14 4-15 4-16

01

4-17 01 4-18 01 4-19 01 4-20 4-21 4-22 4-23 4-24

01

01 4-25 01 4-26

01

4-27 01 4-28

01

4-29 01 4-30 01 4-31 01 4-32

4-33

4-34 4-35

4-36

4-37 4-38 4-39

4-40

01

Page

5-1 5-2 5-3 5-4

Rev

01 01 01 01

5-5 01 5-6 01 5-7 5-8 5-9 5-10 5-11 5-12 5-13 5-14 5-15

01

01 01 01 01 01

01 5-16 01 5-17 5-18

01

01 5-19 01 5-20 01 5-21

01

Page

Rev

Page

Rev

TS-021-013087

•••

01

iii

TABLE OF CONTENTS

SECTION 1 INTRODUCTION

1.1 Scope

1.2 General Description

1.3 Key

1.4

Features

Options and Accessories

•

SECTION 2 SPECIFlCATIONS

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

2.10

2.11

2.12

Physical Dimension Storage Disk Mechanism Track Access Mechanism INDEX Read/Write Power Environmental Conditions Reliability Regulatory Agency

Write

I/o Signal

Capacity

Pulse.

Head and Track Specifications

Requirements

Protect

Mechanism

Interface

•

• • • • •

Certification

..

Page

1-1 1-1 1-2 1-3

2-1

2-2

2-3

2~3

2-4 2-4 2-5 2-5 2-6 2-6 2-6

SECTION 3 Tl-EORV

3.1

3.2

3.3

Construction

3.1.1

3.1.2 Door Opening/Closing and Disk Clamp Mechanism

3.1.3 Spindle Mechanism • •

3.1.4

3.1.5 Seek Mechanism

3.1.6 Write

3.1. 7

3.1.8 Index

3.1.9

3.1.10 Head Load Mechanism

3.1.11 Door Lock Mechanism Circuit

3.2.1

3.2.2

3.2.3 Spindle Motor Test

3.3.1 TP1 and TP2

3.3.2 TP3 Ground •

3.3.3 TP4 and TP5 Di

3.3.4 TP6

3.3.5 TP7

Frame

Read/Write

Track Diskette

Read/Write Control

Points

and Functions

Protect

00

Detection

Operations

Erase Track

OF

OPERATIONS

Assembly • • • • • • •

Head and

Detection

Inserted

Circuits

Pre-Amp

fferential

Gate

00 Sensor

Carriage

•

• Detection

•

Amp

3-1 3-2 3-2 3-2 3-2 3-3 3-3 3-3 3-3 3-4 3-4 3-4 3-4 3-4

3-8 3-10 3-11 3-11 3-12 3-12 3-12

3-13

iv

TS-DZI-OIJ087

•••

01

TABLE OF CONTENTS

SECTION 4 MAINTENANCE

4.1 Periodic Maintenance

4.1.1 Inspection and Adjustment

4.1.2 Field Replaceable Items for

4.1.3 Tools Required

4.2 Maintenance

4.2.1 Screw Torque

4.2.2 Screw Lock

4.2.3 Handling Connectors

4.2.4 Additional Maintenance

4.3 -Head

4.4 Inspection and Adjustment Procedures

4.5 Removal and

Cleaning.

4.4.1

4.4.2 Bail Inspection and Adjustment

4.4.3 Disk-in Sensor Inspection

4.4.4 Write

4.4.5 Disk

4.4.6 Head

4.4.7 Asymmetry

4.4.B Read Level

4.4.9 Resolution

4.4.10 T

4.4.11 Track 00 Sensor Inspection and Adjustment

4.4.12 Index Burst Timing Inspection and Adjustment •

4.4.13 Head Load Inspection and Adjustment •

4.4.14 Door Lock Inspection

4.5.1 Head

4.5.2 Stepping Motor and

4.5.3 Spindle Motor

4.5.4

4.5.5 Sensor Block

4.5.6 Main

4.5.7 Write

4.5.8 Bezel

4.5.9

4.5.10 Clamp

4.5.11 Head Load

4.5.12 Door Lock Solenoid

Precautions

Collet

Protect

Rotational

Contact

rack

Alignment

Replacement

Carriage

Collet

Circuit

Protect Replacement

Front

Lever

Assembly

Replacement Card

Replacement

Cam

Replacement

Maintenance

Precautions

Centering

Sensor

Speed

Inspection and Adjustment

Procedures

Replacement

Steel

Replacement

Sensor

Replacement

•

Replacement

Items

Adjustment

Band

•

• Replacement

•

'.

Page

4-1 4-1 4-1 4-2 4-3 4-3 4-3 4-4 4-4 4-8 4:"9

4-9 4-10 4-11 4-12 4-13 4-13 4-15 4-16

4-17 4-18 4-20 4-22 4-24 4-26 4-27 4-27 4-31 4-32 4-33 4-33 4-34 4-35

4-35

4-35 4-36 4-37

4-38

SECTION 5 MAINTENANCE DRAWINGS AND PARTS

5.1 Construction •

5.2

TS-017-082786

Structural

5.3 Screws and Washers

5.4 Main 5-5

Circuit

Parts

Circuit

Card

•••

01

Listing

Card

Components •

Layout and Schematic Diagrams •

v

LISTS

5-1

5-7

5-9 5-10 5-14

LIST

OF

ILLUSTRATIONS

FIGURE

2-1 3-1

3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-10

3-11

3-12

4-1A 4-1B 4-1C 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-10 4-11 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23 4-24 4-25 4-26 4-27

External Outline Drawing of Disk Drive Overall Block Diagram • • •

Tunnel Erase Type Read/Write Head Read/Write Typical Read Typical Write Control Circui Typical Stepping Motor Control Location

TP1/TP2 Typical Pre-Amp Waveform • • TP4/TP5 Typical TP6 Typical Erase TP7 Track 00

M2553K/54K Revision 2 M2553K Revision 3

M2552K Revision 1 Disk Drive Collet Bail Height Adjustment Bail Adjustment Write Head Asymmetry Measurement • • Average Read Level Measurement (2F) Resolution Measurement • Lobe Track Alignment Adjustment • Track 00 Sensor Adjustment Index Burst Timing Index Sensor Adjustment • Head Load SignalllAII Head Load Signal Head Load Adjustment Screw Head Unload Signal Head Unload Signal Door Lock Solenoid Door Lock Solenoid Head Head Cable Routing • Clamp Head Load Height Adjustment Door Lock Solenoid

Protect

Contact

Pattern

Carriage

Circuits

Circuit

ts

of

Connectors and

Detect

Orientation

Shaft

Cam

Adjustment •

Sensor Inspection •

for

Assembly

•

Waveforms

Waveforms •

• Circuit

Test

Differential

Gate

Waveform

Circuit Circuit

During Maintenance

Track Alignment

IIBII

II

All liB" Activated Deactivated

Amp Waveform

Waveform

Circuit

Replacement

Card -Jumper Card -Jumper Card -Jumper

Waveforms

Points

Locations Locations

Locations

.

Page

.2-1

3-1 3-2 3-5 3-6 3-7 3-9

3-10

3-11

3-12 3-12 3-12 3-13

4-4 4-6 4-7 4-8

4-9 4-10 4-11 4-12 4-14 4-15 4-16 4-17 4-18 4-19 4-21 4-22 4-23 4-24 4-24 4-25 4-25 4-25 4-26 4-26 4-28 4-29 4-36 4-37 4-38

vi TS-017-082786

•••

01

LIST

OF

ILLUSTRATIONS (Continued)

FIGURE

5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8

5-9

5-10

5-9

5-10

TABLE

2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8

2-9

2-10

Top View Top View Bottom Rear Exploded View Drawing M2552K Revision 1 M2553/54K Revision 2 M2553 Revision 3 Interconnec t Diagram M2552K Revision 1 M2553/54K Revision 2 M2553K Revision 3

MFM

Recording

Disk Mechanism Track INDEX Read/Write Power Environmental Reliabili Regulatory Interface

of

Disk Drive (View 1)

of

Disk Drive (View

View

of

Disk Drive

View

of

M255XK

Storage

Access

Pulse.

Supply

Mechanism

• • • • •

Head and

Requirements

Conditions

ty

Agency

Signal - Pin Designation

Certification

Circuit

Schematic

UST

Capacity

Track

2)

Card

Layout

Card

Layout

Card

Layout

Drawing

OF

TABLES

Specifications

Page

5-2 5-3 5-4 5-5 5-6

5-15

•

5-16 5-17 5-18 5-17

5-19

5-21

Page

2-2 2-2 2-3 2-3 2-4 2-4 2-5 2-5 2-6 2-6

4-1 4-2 4-3 4-4 4-5A M2553K/54K Revision 2 4-5B M2553K Revision 3 4-5C

5-1 M255XK Assembly 5-2 5-3 5-4

TS-017-082786

Inspection and Field

Replaceable Maintenance Screw

M2552K Revision 1

Listing Listing Listing

Size and Torque

of of of

•••

Adjustment

Tools

Structural Screws and Washers • •

Main

Circuit

01

Items

Circuit Circuit Circuit

Chart

Parts

Card

Items

••••••• Card

Card

Jumper

Card

Jumper

• Components

vii

Jumper

Definitions

4-1 4-2 4-2 4-3 4-5 4-6 4-7

5-1

5-7

5-9

5-10

1.1

SCOPE

This manual explains

51"

Mini Flexible Disk Drives.

the

service

SECTION 1

INTRODUCTION

procedures

for

the

FUJITSU M255XK Family of

This Section gives Section 2 provides Section 3 explains Section 4 Section 5 contains

1.2

GEI\ERAL DESCRIPTION

M255XK disk drives Half-Height

Industry drives have an independently addressed Read/Write head diskette.

FM (Frequency Modulation) methods

There

standard

are

details

5i" Flexible Disk Drive technology.

acceptable.

three

Models in

an

overview

specifications.

the

maintenance

parts

offer

51"

(130mm)

the

of

the

Disk Drives.

drive's operations

procedures

lists

and mechanical and

superior

or

M255XK Family:

performance,

diskettes

MFM

(Modified Frequency Modulation) recording

are

used

schematic

reliability

as

the

drawings.

and

storage

for

construction

medium. These

each

side

of

in

the

M2552K - This model

unformatted Kbytes with

With a 16 double density/double sided, 96 disk drive.

M255JK - This model

unformatted 802 Kbytes with FM'Encording.

With a 15 double density/double sided, 96 standard

M2554K - This model

allows

TS-021-013087

•••

51" disk drive.

operation

01

records

storage

FM

sector

records

storage

sector

has

5,922 flux transitions

capacity

Encoding.

format

a host

at

either

(256

9,646 flux transitions

capacity

of

bytes

of

(512

bytes

system

300 RPM,

1-1

per

il1ch

1 Mbyte

per

track

1.604 Mbytes with

per

track

controlled

or

with

sector),

per

inch

per

sector) per

inch (1.2 MByte) industry

interface

360 RPM.

MFM

the

51"

inch and has a

the

and has a

Encoding

M2552K

industry

MFM

M2553K

Encording

emulates

line (pin-2)

per

disk

or

500

emulates

standard

per

disk

that

a

or

a

M2554K (Continued)

When inch (similar capacity Encording.

When inch (similar capacity Encoding.

set

of

set

of

at

300 RPM

to

a M2552K) and

1 Mbyte with

at

360 RPM,

to

the

M2553K). and

1.604

Mbytes

the

with

M2554K

has a per

MFM

M2554K

MFM

records

Encording

records

has a per

Encording

5,922 flux

disk

unformatted

or

500

9646 flux

disk

unformatted

or

802

transistions

Kbytes

transitions

Kbytes

with

per

storage

FM

per

storage

FM

MFM

With M2552K - 250 Kbi M2553K - 500 Kbi

M2554K - 250

Spindle M2552K 300 RPM M2553K - 360 RPM M2554K - Host

On all Models, disk.

time.

Except

Refer

M2553K, and M2554K Mini

1.3

KEY FEATURES

recording

- 500

motor

Track Average

for

to

the

to

M255XK

ts ts

Kbits Kbits

speed

system

Track

track

access

di

fferences

methods,

per per per

per

is:

selected

density is 96 TPI and

access

time,

Product

the

data second second second

second

.listedabove,

Flexible

at at

(via an

time

including

Description Manual

transfer

300 RPM 360 RPM

interface

is 3 milliseconds, plus a 15 millisecond

settling

performance

Disk Drives.

rate

signal line)

there

time,

is 94 milliseconds.

for

is:

for

ere

80 cylinders/160

of

the

units

an

overview

300

or

is

identical.

of

360 RPM

the

tracks

settling

M2552K,

per

o

Half-Height o Industry o Industry o

Vertical

Up

to

o o The M2554K may be

or

products) o High quality and o FUJITSU AMERICA

1.604 Mbytes

1.0

(1.625 inches) standard standard clamping mechanism

Mbyte

flexible disk drive mounting flexible disk drive

of

capacity

reliability

unformatted

set

by

disk drive (allowing a single

support

the

host

1-2

interface

storage

computer

capacity

to

function

as a 1.6

source

TS-021-013087

Mbyte

for two

•••

01

1.4

OPTIONS AND ACCESSORIES

o

Automatic

Diskette

Eject

Ejects The disk drive is

ejected).

o Head Load Solenoid

Allows drive via an

Auto-Rezero

o

Rotates Track

o Door Lock

Allows drive is

o Door Switch

Allows regardless

the

diskettes

the

host

system

interface

the

diskette

00, whenever power is turned-on.

the

door

lever

selected

the

of

or

Ready signal

Drive

from

set

when

Selection.

the

disk drive, when

to

the

Not

to

Load/Unload

signal line.

(to full speed) and

to be locked,

In

Use is

to

selected.

be

Ready

the

retracts

to

prevent

active

the

door

State

Read/Write

whenever

(when

the

media

lever

heads

Read/Write

removal,

the

is

the

diskette

in

door is closd

released.

the

disk

heads

when

to

the

is

TS-021-0l3087

•••

01

1-3

SECTION 2

SPECIFICATIONS

2.1 PHYSICAL

Refer

to

the

following drawing (Figure 2-1).

Height:

Width: With Bezel

Depth*:

* Without Weight:

. 5.5" (139.7mm)

DIMENSIONS

With

Bezel

Without

Bezel

With Bezel = B.19 Without

power

Bezel = B.OO

or

interface

= 1.65

= 1.62

=

5.B3

= 5.75

cable

~0.02

~

0.02 inches (41 ~ 0.5mm)

~0.02

connector

3.10 pounds (1.2 Kg) maximum

(41mm)

10

inches (42

inches (l4B inches (146

inches inches (203

1.6"

~0.5mm)

(20B

~0.5mm)

Signal Connector

\ S.7S"

\ 1.8"

r·\L_~

,

, .

.

, .

,

..

'

(l46mm)

10.06

...

V:

1.6" /

......

\L.-l.J/]

'~

1\

(45.5mm) (40mm) I

..

_ }

PCB

.

Power Connector

I

..

•

(JOmm)

Figure 2-1 External Outline Drawing

0>0>

"'N

= = : ·

NN

....

c

ClCl

NV,

3 3 3 3

~~

of

Disk Drive

....

_;

,

....

• I

:.--"'~

• I

11

r

(J8mm)'

___________

5.82"

(~48.0mm)

1.S"

·

I

·

•

I

:

..J

1.9"

(47mm) I /

'/

/

o

II

::

~

II)

o

-

...

2:

TS-021-0130B7

•••

01

2-1

2.2 STORAGE CAPACITY Table 2-1

MODEL NUMBER UNFORMATTED:

Diskette

Each

Track

Each

16-SECTOR FORMAT

Diskette

Each Each

Track

Each

Sector

FORMATTED

Each Each Each

BITS

PER

TRACKS

I OF TRACKS 160 160 160

15-Sectors

Diskette Track Sector

INCH

PER

INCH 96TPI 96TPI

MFM

Recording

M2552K

1.000MB 1.604MB

6.25KB

655.36KB

4.096KB 256 Bytes

-

5922 9646

Storage

M2553K M2554K

1O.416KB 6.25KB

-

1.229MB

7.680KB 512 Bytes

Capacity*

300 RPM

1.000MB

655.36KB

4.096KB 256·

-

5922 9646 96TPI

Bytes

360 RPM M2554K

1.604MB

10.416KB

-

1.229MB

7.680KB 512 Bytes

96TPI 160

I OF CYLINDERS

TRANSFER RATE

*

= One-half

2.3 DISK MECHANISM

MODEL NUMBER

SPINDLE SPEED AVERAGE LATENCY

SPEED VARIATION ROTATIONAL CONTROL SPINDLE MOTOR TYPE

the

given Storage

TIME

80

250KBS 500KBS 250KBS

Capacity

Table 2-2 Disk Mechanism

M2552K 300

RPM

100 msec 83.3 msec 100 msec 83.3 msec ='1.5% Maximum Long

AC

Tachometer

Direct

Drive DC Brushless Motor

80

values with

M2553K 360 RPM 300 RPM 360 RPM

Controlled Frequency Servo

80

FM

Encoding.

300 RPM 360 RPM M2554K

Term

& Instantaneous

80

500KBS

M2554K

SPINDLE START

TIME

400 milliseconds maximum

TS"()21-D1JOB7

•••

01

2.4 TRACK ACCESS MECHANISM

Table 2-3 Track Access Mechanism

PER

STEPS

TRACK

1

step

ACCESS

TIME

Track

to

(Without

Track 3 msec settling

time)

Average (Inner-track) (With

settling

time)

POSITIONING ACCURACY

HEAD SETTLING

HEAD CARRIAGE

TIME

DRIVE

TRACK 00 DETECTION

2.5 INDEX PULSE

94

msec

Within using a Standard

.:t20

.:t

20

micrometers

Test

Diskette

at

40-60% Relative Humidity

at

96 TPI (Track 32),

at

15 milliseconds maximum, does not include access

4-Phase LED and

Mechanical stop on

time

Stepper

Motor and

Photo-transistor

head

Steel

Detection

carriage

Belt

Table 2-4 INDEX Pulse

740 F (230 C)

track

INDEX DURATION

TIME

BETWEEN INDEX 200.00 milliseconds

PULSES

INDEX ACCURACY

FIRST INDEX PULSE

NUMBER

OF

PULSES

INDEX DETECTION

TS-021-013087

•••

01

1

to

8 milliseconds (use

166.67 milliseconds

.:t

1.5%

.:t

1.5%

the

leading edge)

at

300 RPM

at

360 RPM

200.:t 150 microseconds from

the

INDEX hole on a

400 millisecond nominal

(1) INDEX Pulse

One

LED

and

Photo-transistor

standard

after

per

disk revolution

2-3

the

test

disket

Motor

beginning

te

Start

of

2.6

READ/WRITE .-EAD AND TRACK SPECIFICA

nONS

Table 2-5 Read/Write Head and

TYPE OF R/W HEAD

OF

NUv1BER

R/W HEAD TRACK

ERASE HEAD WRITE/READ - ERASE GAP 0.85 !: 0.05mm - M2552K

WRITE/READ GAP AZIMUTH O!: 26' - M2552K Standard

TRACK RADIUS (Maximum)

R/W HEADS

WIDTH

Test

Diskette

Track 00 (External Lap): 57.150mm Side 0

Gimbal supported with Tunnel Erase

Two

0.165mm

0.155 !:

0.095mm

0.58 !: 0.05mm - M2553K and M2554K

o !: 18' - M2553K and M2554K

55.033mm Side 1

Track

(one on

standard

0.0l5mm

standard

Specifications

each

side

of

after

Tunnel Erase:

the

Diskette)

Track 79 (Internal Lap): 36.248mm Side 0

2.7 POWER REQUIREMENTS

Table

+12

+5

VOLTS

DC

!:5% allowable variance during

at

other

200 millivolt maximum

(including noise spikes)

0.22 Amperes average

0.60

0.90 Amperes peak

0.07 Amperes maximum

!:5% allowable variance

100 millivolt maximum

(including noise spikes) -

0.29 Amperes average

0.33 Amperes maximum

0.50 Amperes maximum

0.60 Amperes maximum

times

Amperes

2-6

Power

maximum

34.131mm Side 1

Supply Requirements

read/write

peak-to-peak

current

average

current

peak-to-peak

current

current average average

draw

current

draw (Spindle Motor

draw (Spindle Motor idle)

draw

draw (Spindle Motor idle)

current current

operations and !:10%

ripple voltage

draw

start-up)

.

ripple voltage.

draw (standby mode) draw (operating)

2-4

TS-021-013087

•••

01

2.8 ENVIRONMENTAL CONDITIONS

Table

2-7 Environmental Conditions

OPERATING STORAGE TRANSPORT*

39

to

Ambient Non-condensi

Temperature

ng

Gradients

(Maximum) Relative

Humidity (Maximum Wet-Bulb) Non-condensing

1150 F

to

46

0

(4 590 F/Hour

(150 C/Hour) 20

to

80% 840 F (290 C)

Vibration Tolerance 0.50G 55Hz (Maximum)

Shock Tolerance

0.25G lOG 10msec

55

(Maximum)

* Packed in designated

for

Correctly

When ship)

transport

the

Packed

takes

Storage Environmental Conditions apply.

crates

Freight

place over an extended period (such as

with conditions conforming to JIS-Z0200 - Provisions

Testing Methods; Level

C)

Max. 10

to 150HZ

to

-7.6 (-22

1400 F -40

to

600 C) (-40

Not speci fied

to

1490 F

to

650 C)

860 F/Hour

(300 C/Hour)

to

90% Max. 5 to 95% Max.

1040 F

1130F

(400 C) (450 C) Not Speci fied

2.0G 100Hz

Not Speci fied 40G 10msec

II.

trans-oceanic

by

2.9 RELIABILITY

Table 2-8 Reliability

MEAN

TIME

BETWEEN FAILURES

(MTBF)

MEAN

TIME

TO REPAIR

(MTTR) PERIODIC MAINTENANCE PRODUCT LIFE 5 DISK LIFE DISKETTE INSERTIONS DATA ERROR RATES:

Soft

Read

Error

Hard Read

Error

Rate

SEEK ERROR RATE

11,000 Power-on hours, with

30

Minutes Maximum

Not required.

Head Cleaning

to

subassembly level

years Three One

One One

One

times

per per

per

106 passes/track

104 insertions minimum

109 bits

12

10

(with

bits

(with more

up

to

106 seeks

25%

duty

cycle

if

necessary

minimum

2 re-reads)

than 2 re-reads)

TS-021-013087

•••

01

2-5

2.10 REGULATORY AGENCY CERTIFICATION

Table 2-9 Regulatory Agency

FCC

(Federal

See FCC

Communications Commission) CFD 75U255X

Statement

on inside

of

back

UL (Underwriters Laboratories)

CSA (Canadian Standards Association)

2.11 WRITE PROTECT MECHANISM Diskette's Write

and

Photo-transistor.

Protect

Notch is

detected

2.12 I/O SIGNAL INTERFACE Complete

Product

I/o

control

and

data

interface

Description Manual. Table 2-10 lists

Table 2-10

Interface

Signal Name

cover.

with a Light Emitting Diode (LED)

specifications

the

Signal -

Direction

Certification

UL

EB729-1

LR 60527-1

are

given in

Interface

Pin Designations.

Designation

Signal-Pin

Number Number

the

M255XA

Return-Pin

HD

(Hi Density)/LSP (Speed)*

IN

USE/HEAD LOAD

-DRIVE SELECT 3

-INDEX PULSE

-DRIVE SELECT 0

-DRIVE SELECT 1

-DRIVE SELECT 2

-MOTOR-ON

-DIRECTION SELECT

-STEP

-WRITE DATA

-WRITE GATE

-TRACK 00

-WRITE PROTECT

-READ DATA

-SIDE ONE SELECT

-READY /DISK CHANGE

* Pin 2 is unused in

the

M2552K

Out/In

2 1 Input 4 3 Input Output

6

B

5

7 Input 10 9 Input 12 Input 14 Input 16 Input IB Input Input Input Output Output Output

20 22 24 26 2B 30

11

13

15

17

19

21

23

25

27

29 Input 32 30 Output 34

33

2-6

TS-021-0130B7

•••

01

THEORY OF OPERATIONS

3.1

CONSTRUCTION AND FUNCTIONS

SECTION 3

M255XK drives automated disk, used 5i"

disk drives.

are

constructed

with high precision

techniques. This ensures

as

the

recording medium,

that

has

the

industry

ability

components

standard

to

interchange

As with all high precision equipment, excessive shock and avoided and only

Refer

to

the

trained

Overall

maintenance

personnel should

Block Diagram in Figure

3-1.

service

the

,---Door

,---File

r----File

,--Disk

IDdex

and assembled with

5i"

flexible

data

vibration

with

must

mylar

other

be

unit.

lock

soleuoid

protect protect

seasor

sensor

LFD

LED

T5-021-013087

•••

01

!fapetic

Track 00

~wi~~r---J

Figure

J-1

bead

sensor

OveraD Block

3-1

Diagram

3.1.1 The

are accuracy

Frame

frame

Assembly

assembly is

the

skeleton on which

mounted. This aluminum die

and expansion

ratio

required

cast

chassis ensures

for

stable

the

mechanisms and

the

disk drive operations.

3.1.2 Door Opening/Closing and Disk Clamping Mechanism

drive has

circuit

the

strength,

boards

The door opening/closing mechanism includes lever,

the the spindle

and

end

of

collet

to

set

arm.

the

enters

ensure

set

the

The disk clamp mechanism (Collet) is moved

arm.

the

When a

opening in

disk is

accurately

diskette

the

is

center

clamped into posi tion.

3.1.3 Spindle Mechanism The disk

spindle

rotating

motor a service life rotates temperature into

the

at

300 or 360 RPM and maintains a

fluctuations, by using feedback signals from an AC

motor.

The spindle and the

disk and

to

and disk come into

3.1.4 The

the obtain

Read/Write

flat

shaped

disk and

are

maximum playback from

system

is a

direct

of

20,000

collet

allow

contact

Head

read/write

mounted on

is comprised

spindle coupled

or

more hours

are

precisely aligned

accurate

and

centering

at

exactly

Carriage

heads

the

of

outer

of

continuous operation. The spindle

of

the

correct

are

supported by a gimbal. The heads

carriage.

the

disk, with minimum head

pressure.

the

clamp spring

inserted

of

the

rotor

constant

and

the

disk, and presses

spindle and spindle motor. The

type

DC brushless

speed, even with load and

(flat

front

spring),

up

and down by

lever

against

motor

tachometer

to

prevent

the

disk. This also ensures

injury

to

the

center

location.

The

read/write

heads

are

to

designed

disk

front

is closed,

the

with

motor

built

hole

of

the

heads

straddle

to

contact

Refer record

to

Figure 3-2. The tunnel

and playback

immediately

data,

after

it

is

Rea.d/Write core

erase

and a tunnel

written.

read/write

erase

gap

heads have a

to

_.Direc:tioa

Erase

Figure 3-2 Tunnel Erase Type Read/Write Head

3-2 T5-021-013087

trim

disk

core

the

edges of

of

rotation

read/write

each

gap

track

•••

to

01

3.1.5 Seek Mechanism

The seek mechanism is mechanism includes a carriage stepping

The stepping by single-phase

slides along two guide

motor

via

motor

the

utilizes

excitation

built

steel

around a stepping

band, guide

shafts

band.

a 4-phase

and

it

rotates

track. Parallelism

shaft the

and

chassis,

and designed

3.1.6 Write

This

detector

They

detect

and

distance

capstan,

steel

to

counteract

Protect

is comprised

the

presence

are

assembled

band,

carriage,

Detection

between

the

expansion

of

a Light

or

absence

the

to

and

When a disk with a covered notch is operation protected,

The LED is mounted on sensor is mounted on

of

the

even

write

if a write

the

circuits

is

prevented.

command is given.

the

spindle

write

protect

motor

shaft

and

and is

construction.

one

step

shaft

close

and disk

tolerances.

associated

of

the

disk.

Emitting

of

a wri

te

inserted,

Previously

motor

circuit

card

with a

read/write

connected

capstan

head

to

the

This stepping

0

(1.8

to

)

center

move

lines,

Temperature

items

have

been

Diode (LED) and

enable

the

light

notch

path

on

is broken and any

written

card

and

the

assembly.

(pulley). This

carriage.

capstan

motor

the

carriage

as

well as

The

of

the

is driven

one

the

expansion

carefully

studied

photo-transistor.

the

disk

jacket.

data

is

thereby

photo-transistor

of

3.1.7 Track 00

The Track 00

(photo-interrupter)

to

the

drive's

Detection

detector

is comprised

and a mechanical

circuitry

whenever position (Track 00). The mechanical beyond Track 00 during a

If

the

head

carriage received, the

edge

calibrate

To move

there

of

the

several

is enough margin provided

opening in

the

head

steps

seek

is

at

carriage

beyond

operation

its

the

disk.

the

innermost

(return

maximum M255XK, which has 80 cylinders, calibrate

3.1.8 Index

An

LED and the spindle

disk

at

track

Detection

each

motor

00.

photo-transistor

time

circuit

the

hole passes

board and

are

mounted in

the

assembly.

of

an LED and photo

stop.

the

stop

to

the

The

photo-interrupter

head

carriage

prevents

or

when power is initially

track

it

track

position, and a

to

ensure

to

Track 00), command

number.

move outward 84

the

drive

detector.

photo-transistor

transistor

provides a signal

is

at

the

outermost

the

head

that

to

carriage

the

For

to

detect

example,

turned

step-in

heads will

86

from moving

on. command is

not

the

carriage

command a

steps

the

to

Index hole in

The LED is mounted on

is mounted on

the

sensor

assembly

track

reach

to

have

it

the

block

TS-021-013087

•••

01

3-3

3.1.9 Diskette Inserted Detection

The

diskette

the

disk drive.

The

diskette assembly (photo-interrupter). This drive's circuitry whenever a

3.1.10 Head Load Mechanism

inserted mechanism

inserted

detector

diskette

detects

is comprised

the

presence

of

photo-interrupter

is

inserted

into

or

absence

an LED and photo

provides a signal

the

drive.

of a diskette

in

transistor

to

the

The head load mechanism extends diskettes when necessary.

The head load mechanism is comprised assembly, and associated

3.1.11 Door Lock Mechanism The door lock mechanism locks

to

prevent

The door lock mechanism is comprised

and associated

3.2 CIRCUIT CPERATIONS The drive's

by

allowing them

the

door from being opened, and causing damage

parts.

electronic

Read/Write

Control

Circuits

to

parts.

circuitry

Circuits

- explained in paragraph 3.2.2.

is comprised

- explained in paragraph 3.2.1.

the

come into uniform

the

front lever during

of

service life

of

the

head load solenoid,

the

door lock solenoid,

of

three

of

the

read/write

contact

major sections:

all

read

or

with each

or

the

lost

write

of

data.

eject

heads and

other,

arm

operations

only

lifter

assembly,

Spindle Motor Servo

The Read/Write, and Control the

Servo

3.2.1

The Read/Write circuits,

LSI Figure 3-3.

circuits

are mounted on

Read/Write Circuits

circuits

and associated sections. These various

control

circuit.

Circuits

include

A

partial

- explained in paragraph 3.2.3.

circuits

the

read

are

mounted on

spindle motor board.

circuits,

diagram

of

write

sections

this

circuits,

LSI

control

the

are

main

circuit

low voltage

accommodated in one

circuit

T5-021-013087

board and

detection

is

shown in

••.•

01

Rud,lVrite coil

Erase

coil

eo.on

(center

tap)

TPI

TP2

IP4

IPS

tP'3

J

GIlD

-----------AO

l....I'lrn....t.....L..I Oiode

SIDE

1

1'-r-r"T"T"""'1"T'-r-'

I.

Iwitch

~:f:ii

~:

I

I I

L

____________

The read detector,

circuits

drop

detector

includes a pre-amp, low pass .filter,

Al

At

F'-----1

UD

0.1

and

Urite

driver

VD

_

Figure 3-3

read

output

AO-

Read/Write

driver.

VGSO

-

Circuits

Low

YOltap

cletectioo circuit

---------~

differential

LYS

amp, peak

I

I I

I

I I

I

LJ

Refer signals induced into amp (a pass

The simultaneously applies

difference The

detector,

to

the

read

subtraction

filter.

The amplified signal then goes

differential

in

the

output

from

the

bad influence

circuit

the

timing

chart

in Figure 3-4. The micro-voltage level

Read/Write head during playback is amplified by a

amplifier) and spurious noise components

to

the

differential

amp

shifts

frequency components. The signal is

the

differential

the

proper amount

of

the

playback signal

of

compensation in

amp is

converted

saddle (which

to

the

further

into a square wave by

occurs

zero

during playback

frequency signal component approximately 125k Hertz) is

detector.

The

read

data

when Read

Gate

TS-021-013087

signal is driven

is

true.

•••

01

out

of

the

3-5

drive by

the

read

pre-

are

removed by a low

amp.

crossover position and

accordance

with

the

amplified.

the

peak

of

the

low-

eliminated

output

by

driver

the

drop

circuit,

tfagnetizatiou

of

disk

-I

~

1

......

1--1

1--

Pre-up

Differential

The

write

driver,

and

OQtpllt

amp

OQtp1t

up

OQtpllt

circuits associated

Figure

include

circuits.

,L..-_

3.04

the

....

Typical

write

Read

power

Circuit

gate,

Waveforms

erase

driver,

L

data

latch,

write

The

write

and

the

enable). The tunnel

Read/Write from

Refer Volts being applied interface

Externally two

write

signals Read

write

the

to

Data

power

protect

erase

gap,

turn-on

the

write

signal is

supplied drivers

the

Read/Write

output

gate

and'the

time

turns

sensor

heads

of

the

circuit

to

the

set

true

write

alternately

head.

is

prevented

on when

detects

are

erase

Write

timing diagram in Figure 3-5. Writing is center

and Write

data

pulse

turn

when

the

positioned

gate

signal is

Gate

signal.

tap

of

Protect

strings

on and

the

write

Write

the

Gate

notch

approximately

activated

Read/Write

is

false.

are

off

driver

(interface

on

the

latched

to

send

is

operating.

input signal) is

side

of

the

0.58mm behind

(to

allow

head, when

by

the

data

the

proper

diskette

for

this

enabled

the

Write

latch,

write

true

(write

the

offset)

by

+12

Gate

and

the

current

3-6

TS-021-013087

•••

01

WRIIE

GAIE

input

signal

--,

i

(lDterDal)

Erase

SIDE

WRItE

Data

Write

Hagoatization

gate

ONE

DAtA

latch

driver

WRITE

sigaal

SELECI

input

output

GATE

sigDal

outplt

of

disk

J;J/7~~:=I//J/////#ql/jt-----+-r-

.

Wrlte

__

-JV///'

-.-----

--.1.--------II------------L-

driver

iw»n»»,""",""

Erase

area

driver

of

operatlOD . .

b»»m;m;mmm%VZ1

area

--+-------,-

of

operation

'///.11..-

Erase

off

delay

%I-I-I~I-I-I-I-t3-1-~

Figure 3-5 Typical Write

Low Voltage voltages. The

Detection

output

of from writing (or erasing) unstable.

VDC

•••

detection

circuit

01

will

These low voltage

+5

VDC

+12

TS-021-013087

circuits

the

low voltage

if

the

circuits

activate

Circuit

are

provided to sense low and unstable DC

detection

supplied

are

if

+5

if

voltage

activated

VDC

+12

VDC

Waveforms

circuits

(+5

as follows:

is

at

3.6

is

at

to

9.2

to

prevent

or

+12

4.0 volts.

8.2 volts.

the

VDC)

3-7

disk drive

is low or

3.2.2

Control

Circuits

Refer All

primarily on The

output

to

Figure

control

signals

the circuits

Detectors· protect The individual

Drive

Select drive's These

circuits Jumper corresponding Drive

Head Load determines

Read/Write heads

Write/Erase through recording on Gate to

interface

correspond

3·6.

circuits

are

mounted on

the

Control IC (one chip).

to

the

circuit

select

receive

Read/Write IC and

All

detectors

card,

detectors and Indicator

status

operate

data

from

the

(photo-transistors)

disk-in senSor assembly,

are

described in paragraph 3.1.

Gate

Circuits

and also when

in conjunction with

(Position 0 through 3 which

Select

Gate

the

Gate

the

Write and Erase coils (in

the

- This

set

to

load. . .

Circuits

disk. . These

signal. Erase

to

the

beginning and ending

interface

of

conditions

circuit,

- These circuits

current

signal.

circuits

main

circuit

card

various sensors and

interface.

are

mounted on

or

track

the

- These

Front

the

are

position

set

Bezel

by

circuits

indicator

in conjunction with

that

is delayed

must be

determine

the

operate

of

write

present

when

selected

Read/Write Head) for

in conjunction with

(the

required period

current.

assembly and

circuits

and provide

either

the

are

write

00 sensor assembly.

determine

of

the

user) and

selection

to

current

will

Drive

cause

will flow

the

be

lit.

Select

the

jumpers,

the

Write

of

time)

Spindle Motor

Gate

- This

motor.

Ready Detector)

rotational

Detect

and

speed.

Circuits

sets

the

Stepping Motor Control

over-drive single

determine

the

The timing

shot

circuit

movement

chart

in Figure 3-7 shows

waveform.

output

The

drive

circuit During this high level

carriage. stepping

position (and the

motor

of

the

for

the

time

+12V

of

torque is available

After

motor

centering

coil for holding

to

lower power

coil).

output

- This

circuit

Ready signal

Circuits

and

of

the

Stepping Motor.

Step pulse

prescribed

is

activated

is

requirements

determines

receives

true

when

- These the

circuits,

Direction and Step

typical

generator

time

on

for

circuit

(approximately 30 milliseconds).

the

stepping

seeking and

completed,

the

head

carriage

and excessive heating

the

speed

of

Index .pulses (from

the

disk

reaches

in conjunction with

interface

stepping

motor

control

'.

turnQ

centering

+5V

on

the

motor

coil and a

is applied

at

the

to

correct

the

its

over-

head

the

of

spindle

Index

correct

the

signals,

.

3-8

TS~21-013087

•••

01

....---4

Door

l.ocJt

drive

cinait

t----

Door

lock

IOleooid

Read

Write

IC

lDdu

File

detector

track

Write

...

Erue Write

I

Side 1 select

l5V

detector

protect

00

detector

data

gate gate

(Floppy

tfechaoisll

FDMC

Disk Drive

Q)otrol

Fl'ODt

bezel

LSl)

iadicator

Buffer

r--e'

~--1IMd

IDPUt si&Dal

OIltplt

si&Da1

load soleDOid

.

IDterface

Read

date

..

TS-021-013087

•••

01

I-----1Over-drive

Stepping

driver

Figure

3-6

Control

3-9

circuit

mtor

Circuits

1---

Spindle

.

IIOtor

Stepping

.

IDOtor

DlRECIlON

STEP

Direction

SELECI

input signal

input signal latch

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

output-

Step

out

Step

in

~--------~:~~----

,...---...,';i-------

Over-drive

Motor

circuit

driver

PHASE

PHASE!"

Figl.lre 3-7 Typical Stepping Motor

3.2.3 Spindle Motor The Spindle Motor is

The spindle special excitation, card

on

direction

motor

3-phase driver IC. The flow

is

performed

the

outer

of

periphery

excitation

rotation.

input

~--~---~---+------~--~--4-----1~

input

A

8

I

__

started

is an AC, long Ii

by signals from

controlled so they switch

~

and stopped by

fe,

of

the

motor's

Control

the

"Motor On"

Circuit

brushless 3-phase motor driven with a

current,

the

rotor,

Hall

and

the

element

with

the

to

the

; approx.3

Omsec.

"

Waveforms

interface

switching

mounted on

sequential drive coil and

prescribed direction

signal.

of

direction

the

circuit

of

Rotational voltage on

the

circuit

conversion

feedback

speed is

to

the

of

card

voltage

accurately

maintained,

a feedback signal

inside

the

control

motor's

section

at

the

desired value, by frequency

received

rotor.

of

the

3-phase driver IC.

from an AC

tachometer

Another servo IC is used

to

3-10 TS-021-013087

to

etched

apply this

•••

01

3.3 TEST POINTS Connectors and

and explained in

test

the

Con1ectors:

Jl

Interface

J2

Power

Supply J3 Spindle Motor J4

Stepping Motor

J5

LED

Connector

J6

Door Lock Solenoid

J7

Write

J8

R/W Heads

J9

Track 00, Disk-in

JI0

Head Load Solenoid

Test

Point

TPI

Pre-amp

TP2

Pre-amp TP3 Ground (0 TP4

Differential

Di

TP5 TP6 Erase

Protect,

FlD!tions:

VDC)

fferential

Gate

Amp

TP7 Track 00 Sensor

points

on

the

main

following paragraphs.

J8---~-+-

Lot

NO.

Index

circuit

card

are

identified in Figure 3-8

-t---+--Jl0

,..---------,

Draviag

ISSUE

No.

-+---Jl

r--"

I

I I

-+--32

I

L

__

_

I

o

Figure

3.3.1

Figure 3-9 shows

monitor

(180

TPI

0

)

outputs

and TP2

Pre-Amp

typical

the

Read/Write head output. The pre-ampll

that

ranges

to-peak.

For

accurate

waveform monitoring, a dual

used (with one channel

as

TP2

TS-021-0n087

one waveform. The oscilloscope

•••

01

3-8

Location

TP1/TP2

from

set

to

Pre-amp

several

the

inverted

of

Connectors

tens

trace

ADD

can

be

3-11

and

Test

Points

Waveforms. Use

fier

to

several

hundreds

these

test

has two phase

of

mUll volts

(2-channel) oscilloscope should

input mode)

grounded

at

TP3.

to

monitor

points

inverted

peak-

TPI

and

to

be

3.3.1

TPI

and TP2 Pre-Amp (Continued)

TP1 and TP2

signal.

3.3.2 TP3 Used for grounding

prevent

3.3.3 TP4 and TP5 These

The

(180

to-peak.

shorting nearby

test

Differential

0

outputs

)

are

Ground

points

Amp (like

that

Figure 3-10 shows

~

available for checking

Figure

Differential

are

3-9

TPl/TP2

test

instruments. Use

test

points.

Amp

used

to

monitor

the

Pre-Amp and 2nd Amp) also has two 'phase inverted

ranges from

typical

Typical Pre-Amp Waveform

several

TP1/TP2

/\

the

characteristics

care

the

output

tens

to

several

Differential

/"f\

of

the

Read/Write

when connecting a probe

from

the

Differential

hundreds

Amp Waveforms!

./\

A

of

millivolts

head

to

TP3

to

Amplifier.

peak-

Figure 3-10 TP4/TP5 Typical

For

accurate used (with one channel TP5 as one waveform. The oscilloscope can be grounded

TP4 and TP5 head and amplifiers, and for checking

3.3.4 TP6 Figure 3-10 shows a typical TP6 Waveform.

at

the

low level. TP6

On

Delay

Off

Delay

WRIIE

GAIE

waveform monitoring, a dual

set

to

the

are

available for checking

Erase

time

Gate

is

used

to

check

= 262 ±24 microseconds

= 776 ±24 microseconds

input signal

Erase

gate

On

delay

inverted

track

Differential

the

alignment.

Erase

at

1MB

at

1MB

trace

Gate

(2-channeI) oscilloscope should

ADD

input mode)

overall

Current

to

Write

(194 ±24 microseconds (524 ±24 microseconds

Off

deJ..y

Amp Waveform

to

monitor TP4 and

at

TP3.

operation

is flowing

Gate

of

'in

delay

the

read/write

erase

a,t

1.6MB)

at

1~6MB).

head

..

be

Figure

3;..11

TP6 Typical

}-12

Eraae

Gate

Waveform

TS-021.013087

•••

01

3.3.5

TP7

Track

00

Sensor

Figure

detects

this

Note:

3-12 shows a

when

signal is Low only when

Track

phase

waveform

the

00

for

Track

00

typical

head

carriage

the

output

the

variation

signal

stepping Motor is

is

not

sensor

track

Figure

3-12 TP7

Track

00

is

at

Track

head

is

becomes

constant.

02--J

Track

waveform.

00. Like

at

or

near

True (low level) while

excited.

The

track

Because

'------

the

00.

~track

00

Detect

Waveforms

Track Track

of

this,

00

photo-transistor

00

interface

the

basic

the

timing

(m

level)

00

signal,

excitation

of

the

TS-021-0130B7

•••

01

3-13

4.1 PERIODIC MAINTENANCE

SECTION 4

MAINTENANCE

When used replacing

provides additional information on cleaning

4.Ll Table 4-1

The paragraph number, listed under additional information

The minutes, with about 10 minutes

Inspection and Adjustment

time

at

a normal

parts,

lists

required

Item

Collet Bail - Inspection and Adjustment Disk-in Sensor - Inspection Write

and lubricating should

the

items

to

the

exception

to

perform.

Table 4-1 Inspection and Adjustment

Assembly - Centering Adjustment

Protect

rate,

that

or a step-by-step

perform

Senor -Inspection

periodic maintenance such as cleaning, adjusting,

Items

may require inspection,

the

of

each the

item

Track Inspection and Adjustment - which

not

removal and

be

required

the

read/write

"Refer

To" column in Table 4-1, provides

listed in Table 4-1 is approximately 5

for

5 years.

heads.

replacement

Items

Paragraph

or

adjustment.

procedure.

Refer

4.4.1

4.4.2

4.4.3

4.4.4

To

4.3

takes

Disk Speed - Inspection and Adjustment Head Asymmetry - Inspection and Adjustment Read Level - Inspection Resolution - Inspection Track Track 00 Sensor - Inspection and Adjustment Index Burst - Timing, Inspection and Adjustment 4.4.12 Head Load - Inspection and Adjustment 4.4.13 Door Lock Insp,:,ction 4.4.14

4.1.2 Field Table 4-2

wear

or

Table 4-2, provides a Refer

item

in

to

the

Contact

- Inspection and Adjustment 4.4.10

Replaceable

lists

the

breakage.

the

Maintenance

disk drive.

- Inspection and Adjustment

Items

field

The paragraph number,

replaceable

step-by-step

Precautions

items

listed

removal and

given in paragraph 4.2 prior

that

may require

under

replacement

the

"Refer

procedure.

4.4.5

4.4.6

4.4.7

4.4.8

4.4.9

4.4.11

due

To" column in

to

replacing any

to

TS-021-013087

•••

01

4-1

Table 4-2 Field Replaceable

Items

Item Head

Carriage

Stepping Motor Steel

Band Assembly JA4-5674

Part

Number

Replacement

Interval

Assembly JA3-5321 7,000 Operating Hours

or

5 X 106 Seeks

J3-5295

5 5

X 10

6

Seeks 4.5.2

6

Seeks

Refer

4~5.1

4.5.2 Spindle Motor J3-5294 20,000 Operating Hours 4.5.3 Collet Sensor Main Write Front Front Clamp LED

Note Note

Assembly JA3-5265

Card

Assembly JA4-5717

Circuit

Protect Bezel Assembly Lever Assembly

Cam

Circuit

1: Obtain 2:

Card

Note 1 JA4-5715 If JA4-5207 If JA4-5708

Assembly JA4-5698

Card

Front order

replacement

Bezel and

other

colors with a color drawing number.

JA4-5716 If

part

Front

If If

If

number from Lever

Assembly

defective defective defective defective defective defective defective defective

the

old

part

Circuit

numbers

Card.

are

4.5.4

4.5.5

4.5.6

4.5.7

4.4.8

4.4.9

4.4.10

4.4.11

black

To

items,

for

4.1.3 Tools Required Table 4-3

mentor

list

the

adjustment

Measuring Instruments: Exerciser

Maintenance

tools

that

procedure.

Table

may

be

4-3

Trace

Dual 34-pin

AP

Intraconnector

Products

Relative

required to

perform

Maintenance Tools

(AVA

409

or

equivalent)

Oscilloscope

Adaptor

Part

Number 922576-34-1

Humidity Gauge

Hand Tools: Phillips Screwdrivers (M2.6 and

Flat

Blade Screwdriver (small and medium)

Set

Allen Wrench

(1.5mm

Tweezers, Needle Nose

flat)

Pliers Soldering Iron and Solder Fine Cleaning Brush

an inspection,

M3)

and Wire

Cutters

replace-

TS-021-013087

•••

01

4-2

Table

4-3 Maintenance Tools (Continued)

D;.skettes: (Recommended)

Maintenance Supplies:

Special

4.2 MAINTENANCE PRECAUTIONS Ensure

Jig:

the

following precautions

Commercially available Work/Scratch

(M2552K

Commercially available Cleaning

(Dysan = 802944)

Read Level Alignment

(M2552K = Dysan 206-31, M2553/54K = Dysan 206-34)

Anhydrous Alcohol (Ethyl Alcohol) Cotton Screw Lock Liquid Epoxy Adhesive Lubricating Oil (Kanto Kasel 946P, or equivalent) Light Oil (Nippon Koyu HH-17,

MAX

Media Jig (Jig

are

Diskette

= Dysan 802067, M2553/54K = Dysan 802914)

Diskette

Gauze

or

equivalent)

D)

observed whenever working on

the

disk drive.

4.2.1 Screw Torque Unless otherwise specified,

torque values listed in Table 4-4.

Screw Size

M3

4.2.2 Screw Lock Use screw lock

1.

When lock liquid

2. Before replacing a

three

as

speci fied below:

making an

off

the

threads.

adjustment,

setscrew

all

Table

M2

M2.6

M3

setscrew

screws

4-4 Screw Size and Torque

and hole

are

tightened, according

Torque

11 Inch Pounds

24

Inch Pounds

33

Inch Pounds

24

Inch Pounds (4.5 Kilograms cm)

remove

(or any screw), apply screw lock liquid

the

holding

as

completely

(2

Kilograms cm) (4.5 (6

Kilograms cm)

setscrew as

possible.

to

their

Kilograms cm)

and

clean

size,

old

to

the

to

the

screw

first

3.

When

TS-021-013087

replacing a screw or

•••

01

setscrew,

tighten

4-3

it

to

the

designated torque.

4.2.3. Handling Connectors

Handle connectors as speci fied below:

Off

Always turn power Do not apply excessive

Remove/insert each connector

before inserting force

to

the

by

or

removing a connector.

cable

pulling/pushing in a

or

post pin.

straight

manner.

4.2.4

Overall

Diskette

Set

Additional

Error

Perform when inspecting, adjusting not include perform a window margin

Never use a

Jumper Selections

Set Drive ble with

OSRSTR

.

MS

Ii

.

MM

Maintenance

Test

the Inspection and Adjustment procedures given in paragraph 4.4

data

Read/Write checks,

defective

Select

the

(DSO

test

system, as given below:

Precautions

or

replacing

test

to

work,

or

through

PC/AT

ensure

test

diskette

DS3)

and

CONfIGURATION

parts.

connect

data

Procedures in paragraph 4.4 the

drive

integrity.

during a maintenance

all

jumper selections

(MOVEABLE)

to a test

action.

to

system and

be

compati-

do

0--

JP3

.,4·1

OK1OK2

r:lIR

L:JIl:J

OM20M1

••

JP1

JP2

TS-021"{)13087

__

MOD

RI

~"

01

Figure 4-1A M2553K/5ltK Revision 2

++

-+--+-.J

~

______________

•••

01

J

Circuit

Card -Jumper

Locations

Table

4-5A

M255JK/54K Revision 2

Circuit

Card

Jumper

Definitions

M255JK

and

M2554K M2554K M2554K M2554K

High

Density

Install

Open

Install

Open

Low

Density

Open Open Install

Install

Open Open

Dual

Speed

Install

Open Open

Install

** ** **

(X)

Install Install

(*) (*) (*) (*)

DSO Install Install

(X) (X)

Install Install

DSO Install Install

Install Install

(*) (*) (*)

DSO

** ** ** ** ** **

Open Open Open Open Open

Install

(*)

Install

(*)

(*) (*)

Install

Open Open

Install

Open Open Open

Open

Install Install Install

Install

Open Open

Open Open 300 Low

** **

Install

(*) (*)

Install

Open Open Open

Install

** ** ** (*) (*)

Open Open Open Open

Open Open Open Open Open Open

** **

Install

Install Install

** **

(*)

Open Open

**

** ** ** ** **

Install

Open Open Open Open

**

Install

Open

**

Install

Open

M255JK

and

IBM

PC/AT

Open

Install LSP Density

Open In Use Open

Install

Open Open

DS1

Install

Open RY Ready Open

Install

Open

Install

Open DSR Disk

Install

Open

Install Install

Open DK2 Disk-in Sensor and Dynamic Open

Install

Open Open

Install

Open Open Open

Open

Install

Open DL1 Open DL2

Jumper

1 SP

2 SP

HD

HL

TD MR HM

HS

DSO-3

TM

DO

DC Disk

SM1 SM2

STR

MS

MM

JP3

DK1 Disk-in Sensor Enabled

DM2

DM1

MOD

DL Door Lock JP4 JP1 JP2

RI

DI LD LC

LB

LA

Definition

360 RPM Only Motor

in

High Density LED

Head Load Terminator Pin 34 Head Load Head Load Drive Terminator

Door Switch Ready

Densi Densi

Disk Motor on Motor on wi Motor always

Disabled FWS3 FWS2 Motor-Off

Undefined No No Index Index LED LED LED LED LED

and Head Load Ready

LED In-use

speed

tandem

controlled

Lit

with

for

gated

with with

Select

for

to

pi n 34

Change

Density

ty

and Speed

ty

and Speed change change

Active Active

Index during Read

gated

Gated Lit Lit Lit Lit Lit

Lit

reset reset

with

th

Delay with

Data

with

with with with

with

Latch

and R/W

sense

pin 4

Drive

with Drive

Motor-on

Drive

input

to

pin 34

300 RPM always

with

with Drive pin 16

on'

LD, LC,

Step

during

Pre

Drive DL1 Drive

LED 0 Drive Drive

Drive

and

Head

circuits

output

by

Select

signal

to

pin 34

Control Control

Drive

step

Select

LB

Step Ready

Select

or

DL2

Select Select

Load

changed

2

lines

Latched Unlatched

Select

Clamping

or

LA

and

Ready'

or

Ready

TS-021·013087

•••

01

4-5

DM1DM2

~

I

.•

OSRSTR

,

PCI

AT

CONFIGURATION

~K

• •

HS HM

CFDCED)

0

~

i: i=

D

i

c:=:J

i~

'

RI

FG

OS3 OS2

DS1

OSO

TM

Table

M2553K

IBM

PC/AT

Open

Shorted

DS1

Install

Shorted

Open

Open Shorted DC Disk Change Shorted RI Index

Open

Open FG

Open

Open Shorted

Open

Shorted

Open Shorted

Jumper

DSO-3

MS

MM

TM SM2 SM1

RY

DI

HL HS

HM 2 SP 1 SP DSR STR

DM2 DM1

4-58

M2553K RevisiQll 3

Jumper

Definition

Motor on with Drive Motor on with pin 16 Drive Terminator Density and Speed Densi Ready

Index Frame Head Load with pin 4 Head Load with Head Load with pin 16 Motor speed and R/W 360 RPM Only Disk change with Drive Disk change FWS3 FWS2

Select

ty

to

gated gated

Ground

Active Active

Circuit

Definitions

Select

for input signal lines

Control

and Speed

pin 34

with with Drive

reset

to

Control

pin 34

Pre

Select

with

Ready

Select

circuits

Select

step

Card

Unlatched Latched

changed in

tandem

TS-021-0130B7

•••

01

4-6

~:

~

----------r_---;~~r_----~

DSRij STR

~

nmr:n

IIIl:II:JI

(OPAL

~MS

IMM

~--I

DS! DS2

DSO TM

DM2

r:r:TT-l

C'

DMl MOFD

Factory

Open

Install

(050)

Install

Open Open

Install

Open DC Disk Change Open

Open Open Open

Open Install Install

Open Install MOFD Motor-Off Delay

*

(*)

•

•.

.

Figure

4-1C

M2552K Revision 1

Table

Jumper

050-3

In

4-5C

MS

MM TM

JPl

JP2

RY DO

Use LED

HL

HM

HS LC LED

LB

LA DM2 DM1

L:1:1:1:J

LA

LB

LC

M2552K Revision 1

Jumper Definition Motor on with Drive

Motor on with pin 16 Drive Terminator No

Index during Step

No

Read Ready Door Switch Ready

Lit Head Load with pin 4 Head Load Head Load

Lit LED

Lit FWS3 FWS2

INU

Definitions

Select

for

Data

to

pin 34

with pin 4

wi wi

with

with LED 0

with Drive Active Active

Circuit

to

th th

Drive

HL

HM

HS

Card -Jumper

Circuit

Select

input signal lines

during Step

to

pin 34

pin 16

Select

Select Select

and Ready

o o

Card

~

Locations

• •

RY

DO

DC

TS-021-013087

•••

01

4-7

4.2.4. Additional Maintenance Operating Environment

Perform

temperature clean, dust other

Head alignment checks and adjustments should be done in an

environment

alignment, inspection and adjustment should be made

leaving

adjust

Ground Probe Connection

When (Ground), on

disk drive maintenance on a clean bench in normal

sensitive components.

the

to

this ideal

measuring

Precautions

and humidity conditions. If

or

dirt

at

650 F

drive in

Test

the

Main

(Continued)'

can adhere

+20

and

the

room for 2 hours

temperature

Points

Circuit

Card,

to

the

55%

and humidity conditions.

on

the

to

the

work bench is

Read/Write heads, disk, and

Relative

or

Main ground

Humidity. Head

more, allowing

Circuit

the

Card use TP3

instrument.

not

after

it

to

When

TP3,

Disk Drive Orientation

Unless indicated otherwise, Disk Drive inspections and

adjustments may be made with

vertically as shown in Figure 4-2.

measuring a

or

a Ground point on

Test

Point not

the

drive

the

main

or

on

the

unit placed horizontally

Circuit

user's

system.

Af

RorizoDtal position Vertical positiOD

Figure

4.3

t-EAD

When the

Read/Write heads with a commercially available cleaning disk. Cleaning

heads may improve

a...EANING

the

drive is used in a dusty environment,

...

2 Disk Drive Orientation During Maintenance

it

is advisable

data

reliability, even in a normally

clean

to

periodically

environment.

Card, use

or

clean

the

are

Approximately 5 minutes

commercially available cleaning disk.

the

Use

the

on

Optimum cleaning time varies with cleaning will not accomplish head wear.

TS-021-013087

cleaning disk

package

of

•••

at

the

cleaning disk.

01

required

the

intervals recommended and with

better

to

clean

the

performance and may even cause

4-8

type

the

Read/Write heads, when using a

the

procedure given

of

cleaning disk used. Excessive

premature

4.4

INSPECTION

AND

ADJUSTMENT

PROCEDURES

.

The following

4.4.1

Collet

step-by-step

Assembly

Centering

procedures

Adjustment

Tools Required: Phillips Screwdriver,

Screw Lock Liquid

Refer

1.

to

Figure 4-3.

Remove

the

3 screws fastening

cover.

2. Loosen

assembly

3.

Place prevent turn

4. Adjust collet

arrow, and

5. Turn

the

to

a piece

contact

the

Front

the

core.

the

Front

2 screws fastening

be moved manually).

of

felt,

or

similar

between

Lever

collet

Then press

tighten

Lever

shaft

its

the

to

clamp.

assembly so

the

fastening screws.

to

open and close

heads, and

collet

are

provided to

M3

the

shield cover

the

collet

material

the

shaft

the

shaft

between

then

collet

shaft

assembly in

collet:

ease

any maintenance

to

the

drive and remove

assembly (allowing

the

Read/Write heads

release

the

door lock

slides smoothly against

the

direction

task.

the

cam

of

the

shaft

to

and

the the

Make sure

spindle

6. Install

Collet

the

cap.

the

shield cover.

shaft

.aunt

plate

screw

operation is performed smoothly, without catching on

Collet

shaft

.aunt

plate

screw

the

TS-021-013087

•••

01

Figure 4-3

Collet

4-9

Shaft

Adjustment

4.4.2 Bail inspection and Adjustment Tools Required: Phillips Screwdriver,

Screw Lock Adhesive

Refer

1.

2. Check

3. Check

4. Slowly

5.

6. Check for sufficient

7.

to

Figures 4-4 and 4-5.

Open

not 0.35" (9mm)

closed (clamped). .

inserted Repeat

clamp operation is smooth.

the heads

Coat

the

Front

the

that

insert

without the

inserting and

head window (the opening in

contact

the

adjustment screw with Screw Lock Adhesive and

Lever so a disk

gap between

turn

the

upper

a disk

the

.andensure

jacket

ejecting

clearance

disk surface) catching. on

the

bail assembly and

bail assembly adjustment

arm

does

contacting

M3

can

be inserted.

not

there

the

disk 2 or 3

for

the

contact

is sufficient

either

diskette

disk

the

read/write

jacket

either

Spindle Motor. If

screw

times

to

through which

read/write

to

adjust

bail when

clearance

head. to

be

inserted/ejected

head.

fasten

the

for

certain

the

gap.

front

the

disk

the

read/write

bail.

gap is

lever

to

the

eject

without

is

be

8&11------,

Adjustment screw

Viewed from

Figure

4-4

r---------

r-------

the

Front

Bail Height Adjustment

Bezel Side

Am

lifter

Upper

Disk Drive motor

plate

arID

edge

TS-021-013087

•••

01

4-10

Adjustlllent screw

Figure 4-5 Bail Adjustment

4.4.3 Disk-in Sensor Inspection

Tools

1.

2.

3. Turn-on power

4.

Required:

Place Front

Connect

when a

Insert a diskette

the

Lever

diskette

Work/Scratch Oscilloscope Disk Drive

Disk Drive on

upward.

an Oscilloscope (DC

to

is

and

Power

the

disk drive and

not

inserted.

check

Diskette

Supply

its

side,

range

that

the

with

IV /div)

check

voltage

the

to

J9 pin 6.

is 2.5 V

LED

that

indicator

the

voltage

or

more.

downward and

is 0.5V

or

the

less

TS-021-0130B7

•••

01

4-11

4.4.4 Write

Protect

Sensor

Tools Required:

Refer

1.

2.

3. Mount

4. Move

5. Make sure

6. Pull

7. Make sure

to

Figure 4-6.

Place Front

Connect Protect

notch

(with

the

Lever

A is above

the

signal on

the

Drive

jig

MAX

Media Jig (Jig Oscilloscope Disk Drive Power Supply

Disk Drive on

upward.

oscilloscope

the

MAX

the

out the

Media Jig in

the

light

if

strong

Write

at

the

notch A position) with Disk Drive power

slightly, so notch B is in

Write

at

the

notch B position) with Disk Drive power

its

(PC

interface

path

external

Protect

side, with

connector

the

of

interface

D)

the

LED

indicator

range

the light is striking tile Write

at

one

volt

per

(pin-28).

position shown in Figure 4-6. Be sure

Write

Protect

signal (pin-28)

the

light

path.

signal (pin-28)

sensor.

downward and

division)

Protect

reads

0.5 volts

turned

3.0 volts or more

turned

to

sensor.

on.

the

Write

that

or

the

less

TS-021-013087

•••

01

Figure

4-6

Write

4-12

Protect

Sensor

4.4.5 Disk

Rotational

Speed

Tools Required:

Proceed

1.

2.

3. Seek

4. Make sure

4.4.6 l-lead Tools Required: Work/Scratch

Proceed

as

follows:

Connect Start

the

seconds

Contact

as

follows:

Disk Drive Power Supply Exerciser Oscilloscope Soft

the

frequency

Spindle Motor and load

Read/Write heads

the

timing

at

300 RPM and 166.7 ± 2.5 milliseconds

Inspection and Adjustment

Flat Exerciser Oscilloscope

Screw Lock Liquid

(AVA

Sector

Blade Screwdriver, small

Work/Scratch

counter

interval

(AVA

409

or

to

the

to

Track 00. of

the

Diskette

409

or

equivalent)

Diskette

INDEX

work/scratch

INDEX

equivalent)

interface

diskette.

signal is 200

at

360 RPM.

signal (pin-B).

±3

milli-

1.

Connect circuit

2. Load

3. Seek

4. Record and WRITE DATA frequency

5. Write down step

Refer

6. Circuit ounces (10

7. Compare

measured in

B.

Repeat

9. Seek

the

card.

the

4. to

steps

the

Set

work/scratch

Read/Write heads

then

the

Figure 4-7.

Card

and press

to

20

the

step

4 through 7

Read/Write heads

oscilloscope

the

oscilloscope range

read a

average values shown on

grams).

average values found in

5 is

BO%

to

diskette

to

constant

of

250kHz

Insert

a thin rod into the inspection hole "1"

the

top

Repeat

or

more of

for

side 0 and side 1.

to

TP1, TP2 (Pre-amp T

and

start

the

innermost

"2F" on

for

of

the

steps

the

Track 00 and

est

Points) on

to

AC rhode, 0.2V.

the

Spindle Motor.

track.

the

entire

M2552K and 500kHZ for M2553/54K).

the

oscilloscope while performing

head very slightly

4 and 5 with

steps

5 and 6. Ensure

value measured in

repeat

steps

track

to

the

weight applied.

step

4 through

(2F is a

apply

the

6.

the

l's

of

the

about 4 to

Read Level

B.

main

only

Main

7

TS-021-0130B7

•••

01

4-13

4.4.6 Head

Contact

Inspection and Adjustment (Continued)

10. If

the

results

are

probable causes:

(a)

Faulty If

the

and

retry

(b)

Faulty The movable

head may need adjustment

Refer

replaced.

(c) Deformation of

Deformation, diskette, checking

of

steps

Diskette

diskette

the

or

test.

its

Head Pressure

flat

spring

to

paragraph 4.5.1,

the

or

bending,

then

slowly opening and closing

the

Read/Write heads

4 through 9

jacket

is

that

(refer

if

the

Diskette

of

are

not

bent

or

damaged,

rides on

to

head

the

to

be

the

paragraph 4.4.2).

carriage

diskette

sure

the

satisfactory,

replace

white

is

the

it

part

of

defective

following

with a new one

the

is checked by removing

the

Front

surfaces

Lever while visually

are

parallel.

items

Read/Write

and

must

be

the

Reed

touch

iDspectiOD

bole

TS-021-013087

•••

01

Figure 4-7 Head

Contact

4-14

Inspection

4.4.7 Asymmetry

Tools

Proceed

1.

2.

3. Seek

4.

5. Measure

Required:

as

follows:

Connect the

oscilloscope

per

division

Start

Record WRITE OAT A

the

READ

Work/Scratch Exerciser Oscilloscope

the

oscilloscope

range

time

base.

Spindle Motor and load

Read/Write

and

then

frequency

asymmetry

DATA

head

read a constant

as

Diskette

(AVA 409

to

DC mode, 2 Volts

to

of

125kHz

shown in

IF

or

the

innermost

Figure

cycl-e

equivalent)

READ DATA

diskette.

track.

"IF"

for

on

M2552K and 250kHZ

4-8.

-I:

I

......

I---Asymmetry

per

the

interface

division, and 1 microsecond

entire

signal (pin-30).

track

for

(IF

is a

O's

M2553/54K).

Set

only

Note:

6.

At the

7.

Repeat

. 8. If

asymmetry

(a) A high

(b) The (c) The

(d) The main

Set

the

on

the

innermost

M2552K

steps

there near

the

diskette

Read/Write

(refer

Trigger

Figure 4-8 Asymmetry Measurement

oscilloscope so 3

screen,

or

4 through 6

concentration

is a

drive, move

to

as

shown in

track,

300 nanoseconds

standards

magnet,

may

paragraph

circuit

paragraph

are

transformer,

be

head may

4.5.1). card

4.5.6).

read

data

Figure

ensure

or

for

side 0 and side 1 •

not

met,

of

magnetic

it

and

repeat

faulty.

may

4-8.

the

asymmetry

less

the

motor,

Replace

be

faulty.

be

pulses

for

the

following

flux may

CRT

the

asymmetry

the

Replace

faulty.

can

be

observed and

is 600 nanoseconds

M2553/54K.

items

or

diskette

Replace

are

be

near

other

the

source

measurement.

and

repeat.

head

the

or

probable

the

carriage

main

causes.

Disk Drive. If

of

magnetism

circuit

measured

less

for

assembly

card

TS-021-013087

•••

01

4-15

4.4.8

Read

Level

Tools Required:

Work

Diskette

Exerciser (A V A 409 or equivalent) Dsc illoscope

Proceed

1.

as

follows:

Connect

the

oscilloscope channels AC mode, both channels division

Put

2.

Start

3. Seek

time

base.

one

of

the

channels in

the

Spindle Motor and load

the

Read/Write heads

4. Record and then read a WRITE DATA frequency

5. Measure

the

average Read Level value (Vp-p),

ADD

to

invert

to

the

constant

of

250kHz

to

0.2 volts

mode, and

the

level

innermost

"2F" on

for

M2552K and 500kHZ for M2553!54K).

TPI

and TP2.

per

put

diskette.

track.

Set

the

oscilloscope

division, and 1 microsecond

both channels

the

entire

refer

to

Figure 4-9.

track

Yp-p

to

ADD.

(2F is

aI's

to

per

only

Figure

6. Ensure

the

Read Level

Innermost

7.

B.

Repeat

If

the

steps

4 through 6 for side 0 and side

results

probable causes:

(a)

Faulty

diskette. (b) Abnormal disk speed. (c)

(d) (e)

Faulty Faulty Faulty

head

Read/Write head.

circuit

4-9

track

are

not

Replace

contact.

card.

Average Read

(true

value) is within

Level

the

Read Level = 200mvp-p

1.

within

Refer

the

indicated range,

the

diskette

to

paragraph 4.4.5.

to

paragraph 4.4.6.

Refer

to

paragraph 4.5.1.

to

paragraph 4.5.6.

if

Measurement

(2F)

range shown below:

or

more (all M225XK Models).

the

following

it

is

bent

or

damaged.

items

are

TS-021-0130B7

•••

01

4-16

4.4.9 Resolution Tools Required:

Work

Exerciser

Oscilloscope

1.

Connect

the

oscilloscope channels

AC mode, both channels

2.

division Put

Start

time

base.

one

of

the

channels in

the

Spindle Motor and load

Disk

(AVA

to

invert

409 or equivalent)

to

TP1 and TP2.

50 millivolts

mode, and

the

level disk.

per

put

Set

the

oscilloscope

division, and 1 microsecond

both channels

to

ADD.

to

per

3. Seek

the

Read/Write heads

4. Record and then read

frequency with only

the

M2553/54K).

5. Measure

6. Record and then

the

average

read

frequency with only

the

M2553/54K - double

7. Measure

ADD

the

average

read

Figure 4-10 Resolution Measurement

8. Use

the

measured values

Resolution

(true

value) =

to

the

innermost

the

innermost

O's

recorded of 125kHz for

track

level (shown as

the

innermost

l's

recorded is 250kHZ for

the

IF

of

level (shown

of

V1F

and

V2F

track

step

V2F

X 100

4). as

in

V1F

track.

with a

constant

the

V1F

in Figure 4-10).

with a

constant

the

V2F

in Figure 4-10).

the

following formula:

"IF"

(WRITE DATA

M2552K and 250kHz

for

"2F" (WRITE OAT A

M2552K and 500kHZ for

9. Ensure

10.

Repeat

11. If

the

innermost steps results

4 through 9 for side 0 and side 1.

probable causes: (a)

Faulty

Diskette. (b) Abnormal disk speed. (c)

Faulty

(d)

Faulty

(e)

Faulty

Ts-021-013087

head

head.

circuit

•••

01

track

are

not

contact.

Refer

card.

Resolution

within

Replace

the

Refer

to

paragraph 4.5.1.

Refer

to

(true

the

indicated range,

diskette

to

paragraph 4.4.5.

to

paragraph 4.4.6.

value) is 60%

if

it

paragraph 4.5.6.

4-17

is

bent

or

more.

the

following

or

damaged.

items

are

4.4.10

Track

Alignment

Tools Requi red: Phillips Screwdriver,

Alignment Disk Flat

Blade Screwdriver, medium

Exerciser

(AVA

409 Oscilloscope Intraconnector Relative

Humidity

34-pin

Meter

Screw Lock Liquid

Note:

Perform

track

temperature extremely under

these

alignment inspection and adjustment

and humidity. Avoid

low or high humidities (even

conditions).

Place

environment for 2 hours before

the

When inspecting

Proceed

1.

Connect

which

as

it

is normally used (horizontal

follows:

the oscilloscope channels AC mode, with both channels 20

milliseconds both channels connector

(between

per

to

ADD.

the

alignment,

to

division.

Put

Connect

drive and exerciser).

M3

or

equivalent)

the

starting

place

or

to

TP4 and TP5.

0.5

volts

one

of

the

at

normal room extremely if

the

low

temperatures

Disk Drive is normally used

Disk drive and disk in a normal

the

following procedure.

the

Disk Drive in

the

position in

vertical).

Set

the

oscilloscope

per

the

channels in

trigger

division,

input

Set

to

the

invert

pin-B

time

base

mode, and

of

the

intra-

or

to

at

put

2.

Start

the

Spindle Motor and load

3. Seek

4. Check

the

Read/Write heads

for a pattern

a. If only one lobe

connected, procedure given in

b.

If

lobes

inward 4

Note: The

gain

percentage

on The lobes (each full division is equal equal

to

the

to

Track 32, from

of two lobes

Figure 4-11 Lobe

pattern

the

head is

step

VA

and

VB

are

tracks

(track

36)

of lobe

5 below.

(VA

Pattern

is observed,

off-track.

within 20%

then VA

to

channels A and B until

are

then

compared and should

to

4%).

alignment

diskette.

track 0 (outermost

and

VB

levels need

for

In

outward 4

VB

is measured by adjusting

the

larger

Track

or this

of

tracks

Alignment

when

case

each

lobe is 5 divisions in amplitude.

be

within 1 division

20%, and each of

not

the

two lobe

proceed to

other

(track

then seek

32).

the

track).

coincide).

patterns

the

alignment

the

variable

of

each

minor divisions

are

heads

other

are

TS-021-0130B7

•••

01

4-1B

c. If head

other graph 4.4.11.

head and

alignment

repeat

is within 20%

procedure

(after

steps

the 4 track 1 through 4,

move in/out)

then

proceed

select

to

the

para-

5. Adjust is

(a) Slightly loosen (b) Push

(c) Move

(d) The

6. Tighten

repeat (see the

9.

Remove stepping

10.

Inspect

track

greater

the

rear

heads

side 0 and side

the 2 screws

the

step

specified

and

alignment,

than

20% as

the

tip

of

the

stepping

several

adjustment

4 for how

torque

the

alignment

motor

mounting

adjust

using

described

the

screws

of a screwdriver

Disk drive).

tracks

1.

Track

in and

should

for

(if required)

to

measure

of

20 inch pounds (9 kilograms em).

disk and apply

screws.

00

holding

motor

be

the

stepping

sensor

the

following

above in

only slightly, and

out,

made

this

(refer

step

the

stepping

into

the

until

the

to

minimize

motor

until

the

20%), when

screw

to

paragraph

procedure,

4.

Refer

motor.

tooth

Alignment

the

in

sequence a little

Alignment

lock liquid

if

to

in

the

then

Error

Alignment

Error

the

screws

4.4.11).

the

Alignment

Figure

stepping

step

4-12.

the

is minimum.

is

less

are

to

the

motor

Read/Write

Error

at a time

for

than

tightened

heads

of

Error

(from

both

and

±.20%

to

the

TS-021-013087

•••

01

Figure

4-12

Track

Alignment

4-19

Adjustment

Stepping

IIIOWlt screw

l

IDOtor

4.4.11 Track

00

Sensor Inspection and Adjustment

Tools Required: Phillips Screwdriver,

Work/Scratch

Diskette Alignment Disk Exerciser

(AVA

409 Oscilloscope Screw Lock Liquid

Proceed

1.

as

follows:

Connect

DC mode, 1.0 volt Start

2.

3. Ensure

4. Seek

5. Ensure

6. If

the

located

the

located

the

adjust

the

at

the

away from Track 00

voltages, measured in

the

Intraconnector

the

oscilloscope

per

division.

Spindle Motor and load

voltage

Track

at

00.

Read/Write heads to

voltage

Track

at

00

sensor position

34-pin

to

TP7 (Track 00 Sensor).

the

TP7 is 0.5 Volts or less with

track

TP7 is 3.0 Volts or more with

(track

steps

M3

or

equivalent)

work/scratch

02.

02). 3 and 5,

as

follows.

are

diskette.

not

within

Set

the

oscilloscope

Read/Write heads

the

specified range,

to

Connect

7. Connect

Set Set

B.

Insert

9. Seek

the

oscilloscope's

the

Trigger

the

oscilloscope to AC mode, 0.2 Volts

Time Base

the

to

alignment

Read/Write heads

to

20

milliseconds

diskette.

vertical

pin-B

of

to

the

per

input

to

TPI

Intraconnector

per

division.

the

alignment

shown in Figure 4-11 is observed (Track Alignment

proceeding,

10.

Connect DC mode, 1.0

11. Seek

the

refer

to

paragraph 4.4.10).

the

oscilloscope to TP7 (Track 00 Sensor) and

volt

per

division.

Read/Write heads

to

track

02.

or

TP2 (pre-amp).

(Index).

division, and

track,

where

must

set

invert

the

be

the

channel

lobe

correct

B.

pattern

before

oscilloscope

to

TS-021-0130B7

•••

01

4-20

4.4.11

Track

00 Sensor Inspection and

Adjustment

(Continued)

12. Loosen forward

Adjust

the

Track 00 sensor mounting screw and move

(refer

the

to

sensor

approximately 0.5 Volts

Note:

13. Check

14.

Move

Repeat

the

steps

the

sensor cautiously - Track 00

3 through 5.

adjustment until

specified range,

15. Apply screw lock liquid

Disk-in Disk-in

sensor sensor

Figure 4-13).

to

the

intermediate

to

after

tightening

to

the

3.0 Volts and

the

values in

the

mounting screw to

head of

track

00

the

sensor

the

sensor backward and

point, where TP7 voltage changes from

then

tighten

output

steps

the

mounting screw.

voltage changes suddenly.·

12 and 13

the

specified

are

within

torque.

the

mounting screw.

TS-021-0130B7

•••

01

Figure

4-13

Track

track

__

""'--

__

-.:...-..",.;:-~=-

00 Sensor Adjustment.

4-21

00 sensor

IIIOWlt screw

track

<

IIOUDt screw

Beclt

side

00

bracket

>

4.4.12 Index Burst Timing Inspection and Adjustment

Tools Required: Phillips Screwdriver,

Alignment Disk Exerciser

(AVA

409

Oscilloscope

Screw Lock Liquid

Refer

1.

Set

to

Figure 4-14.

the

oscilloscope as follows:

Channell:

Intraconnector

Connect to TP1 (pre-amp), AC mode, 0.2V

. 34-pi n

Channel 2: Connect to TP2 (pre-amp), AC mode, 0.2V

to

50

microseconds

to

pin 8

to

External,

each

the

2.

3.

Time Base: Set Trigger: Set

Trigger mode

sweep Start Seek

the

Spindle Motor and load

the

Read/Write heads to Track 02.

at

Connect

the

beginning of

M3

or

equivalent)

per

division.

or

intraconnector

on

the

disk rotation).

alignment disk.

per

division.

per

division.

(Index), DC mode.

negative edge (this will

start

the

4. Measure

duration

of

"t"

in Figure 4-14.

the

INDEX

Pre-amp

+---\1

t

Index bu.rst

delay

Figure 4-14 Index Burst Timing

5. Ensure for

6. Seek

that

Index Burst Timing is within

all models in

the

read/write

the

M255XK family. Switch heads and reverify timing.

heads to

track

68. Verify

within specifications. Switch heads and reverify timing.

If

the

7.

timing speci fications, proceed balance point

at

either

between

track 2 or

to

step

the

four locations

track

68, head 0

8 and adjust

(tracks

range

of

the

Index Burst timing is

or

the

Index Sensor

200

±.

150 microseconds,

head 1, is outside

to

2 and 68, heads 0 and 1).

still

of

achieve a

TS-021-013087

•••

01

4-22

4.4.12 Index Burst Timing Inspection and Adjustment (Continued)

8.

If

Index Burst Timing is

Index Sensor (a)

Refer

the

given in

(b)

After

adjustment

as

follows:

to

Figure 4-15. Loosen

sensor until

step

6.

tightening

until

not

within

the

True Index Burst Timing is within

the

mounting screw,

the

True Index Burst Timing is within

the

range specified in

the

Index sensor mounting screw and move

to

the

specified torque,

range.

step

6,

adjust

the

specified range

repeat

thespeci

the

fied

Coat

(c)

liquid.

9. Remove

the

head

the

alignment disk.

Sensor

adjustment

of

the

mounting screw with a

position

direction

,----

small

quantity

Indu: seasor

Index sensor

mant

screw

of

screw

lock

TS-021-013087

•••

01

Figure 4-15 Index Sensor Adjustment.

4-23

4.4.13 Head Load Inspection and Adjustment Tools Required:

1.

Set

the

to

Figure 4-1, Table 4-5.

Set

the

2.

Start

3.

4. Record a

125kHz

5. Adjust Channel 2

gain controls, until equal

oscilloscope

Channell: Channel 2: Trigger: Set

the

to

Phillips Screwdriver, Allen Wrench, 1.5mm Oscilloscope Scratch/Work Disk Exerciser Screw Lock Liquid Intraconnector

Head Load jumper selection

Trigger mode

Spindle Motor and load

pattern

for

the

M2552K and 500kHZ

5 divisions.

(AVA

as

follows:

Connect Connect Connect

to

of

IF

output

the

M3

409

or

equivalent)

34-pin

to

HS

and

set

Drive

to

TP4, AC mode, 0.2V

to

TP5, AC mode, 0.2V

to

pin-4

of

intraconnector

External,

(all zero's) on Track 04 (Write

waveform, using

amplitude

on

the

negative

the

alignment disk.

for

the

of

Level "A"

edge

M2553/54K).

the

oscilloscope's ranges and variable

as

Select

Data

shown in Figure 4-16 is

to

DSO,

frequency

refer

of

Figure 4-16 Head Load

6.

Refer time to 90% of maximum amplitude (Leve1IB")

to

Figure 4-17. While

from head unload

DRIVE

SELEC.I

Figure 4-17 Head Load

selecting

to

head load. Ensure

Si&Da1l

100

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

~~=========+~------

lO.=;======;;;;:;;:;:~

CO,.

SignallA"

and deselecting

that

is less

!fax.

so.sec.

Interval

A----

than

and

the

drive, measure

the

time,

50 milliseconds.

B

__

Signal

from

_

"8"

scope

the

trigger

TS-021-013087

•••

01

4-24

7. If height using repeat

B.

Seek

the

Head Load

steps

the

5 and 6.

heads

Head

Interval

the

1.5mm

to

Track 79 and

load

is

greater

Allen wrench,

repeat

steps

than

50 milliseconds, adjust

as

shown in Figure 4-1B below, and

4, 5 and 6.

the

head

A

fter

completing

9. Use

drive

10. Use

drive

Figure

the

above procedures check

the

oscilloscope to measure Channel 2

selected,

the

oscilloscope

deselected,

refer

4-18 Head Load

to

Figure 4-19.

---tA

Figure

4-19 Head Unload Signal nAn.

to

measure Channel 2

to

Figure 4-20.

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

Figure

4-20 Head Unload Signal "B"

Adjustment

the

unload level as follows:

output

----

output

Screw

waveform "A" with

waveform "B" with

the

disk

11. Check

If

12. readjust steps

13.

Coat jumper

TS-021-0130B7

that

the

head load or unload level is

4 through

the

to

B/A X 100 (%) is within

the

Head Load Adjustment Screw (see

11

as

required.

head

its

•••

of

the

adjustment

original position.

01

the

screw with screw lock and

4-25

specified range,

out

of

specification

step

repeat

7 above) and

for

Track 79.

(see Figure 4-17),

return

then

repeat

the

HS

4.4.14 Door Lock Inspection Tools Required: Phillips Screwdriver,

Scratch/Work Disk

1.

2.

Set

Drive

Refer activate

Exerciser

Select

to

to Figure 4-21.

the

door lock solenoid and lock

(AVA 409 or equivalent)

DSO,

refer

Select

to

the disk drive, with

Figure 4-21 Door Lock Solenoid

M3

Figure 4-1, Table 4-5.

the

door.

Activated

front

level released, to

3.

Refer

solenoid is

4.

Select solenoid and

to

Figure 4-22.

deactivated

and

deselect

stopper

Deselect

and

the

disk drive. Ensure

the door is released.

Figure 4-22 Door Lock Solenoid

the

drive

operate

several

correctly.

times

Deactivated

to

ensure

that

the

door lock

TS-021-013087

•••

01

4-26

4.5

REMOVAL AND REPLACEMENT PROCEDURES

The following assemblies

4.5.1 Tools Required: Phillips

Figure

1.

2.

3.

4.

5.

Head

4-23 is an overview drawing and

Remove Remove

(Figure 5-5,

Disconnect Remove

4-25C.

Remove

item

22).

upper

step-by-step

within

Carriage

the

cover

the

item

all

the

Fasten

or

lower

the

disk drive.

Replacement

Phillips Tweezers Alcohol and Screw

screws

mounting

43).

cable

head

two

cable

mounting

the

read/write

procedures

Screwdriver, Screwdriver,

Gauze

Lock Liquid

and

the

screws

connectors

from

screws

Bail Assembly with a

head.

shield

and

at

its

explain

M3 M2.6

Figure

lift

the

cable

and

the

removal

4-24 shows Head

cover

main

take

(Figure 5-5,

up

the

circuit

clamp,

out

felt

refer

the

pad so

and

Cable

item

main

card

circuit

and

remove

to

Figure 4-25A through

Bail Assembly

it

does

replacement

Routing.

44). card

not

assembly

the

card.

(Figure

contact

of

5-5,

the

6.

There steel carriage band from band fixing

7,.

Detach the

8.

Remove

remove

9.

Remove that then

10.

Prepare The guide

single assembly.

11.

Fit clips.

12.

Install

are

band assembly. Grasp fixing

(Figure

fixing

head

carriage

the

are

holding

remove

the

guide

the

head

two fixing

5-5,

plate

and

pulley

band

washer

4 mounting

the

guide

new head

shafts

and

shafts

carriage

plates

item

7)

plate

B

B and

remove

screw

(Figure 5-5,

screws

two

guide

shafts.

carriage

head

into

their

assembly by

connecting

plate

with your fingers and push

the

steel

them

at

(Figure 5-5,

item

and

shafts

assembly and

carriage

grooves on

reversing

the

head

B (Figure 5-5,

band spring (Figure 5-5,

the

same

time.

item

14) and

the

guide

(Figure 5-5,

assembly

56) then

shaft

the

two

must

the

chassis, using

step

items

new guide

9.

carriage

from

the

clips (Figure

always

assembly and

item

12) and

to

disengage

the

stepping

steel

band.

8 and 9) in

shafts.

be

item

13)

5-5,

place,

replaced

the

guide

the the

motor,

item

the

head

steel

from

10)

and

as

shaft

a

TS-021-013087

•••

01

4-27

Figure

4-23 Head

Carriage

Assembly

Replacement

4.5.1 Head

13. Reverse pulley

Note:

14. Reverse

to

Carriage

section

Carefully mechanisms with alcohol and gauze

the

head

T5-021-013087

Replacement

the

procedure described in

of

the

stepping motor.

clean

the

procedures described in

carriage

•••

01

the.

assembly (use band fixing

(Continued)

surfaces

4-28

step

of

before

steps

8 and

the

steel

assembly.

6 and 7

plate

reinstall

to

B and

the

band, pulley and

reconnect

the

band spring).

steel

the

band in

steel

the

other

band

15. Temporarily the

stepping motor.

fasten

the

screws

that

hold

the

steel

band in

the

pulley

section

of

After

16. steel tensioned so surface

17.

Refer Circuit

lB. Move

that

19. Inspect head

moving

the

head

carriage

band fastening screws

that

it

is

perfectly

of

the

band

or

pulley.

to Figure 4-24. Carefully

card

and

its

the

head

steel

carriage

band

stays

contact

shield

plate

between

straight

(paragraph 4.4.6).

manually several

to

the

specified torque. The band must

straight.

route

the

and

the

innermost

that

there

20. . Inspect asymmetry (paragraph 4.4.7).

21. Adjust

track

alignment (paragraph 4.4.10).

22. Adjust Track 00 sensor (paragraph 4.4.11).

23. Adjust Index Burst Timing (paragraph 4.4.12).

24. Check Read Level (paragraph 4.4.B).

25. Check Read Resolution (paragraph 4.4.9).

times,

Be

careful

head cable and

track

carefully

not

to

install

and Track 00

is no abnormal noise.

tighten

scratch

the

to

ensure

the

be

the

Main

26. Install Connect

27.

the

shield

cover

Disk Drive

(see

to

step

the

1).

user's

Stepping

system

and perform an

IIOtor

overall

test.

TS-021-0130B7

•••

01

Figure 4-24A Head

4-29

Cable

Routing

4.5.1 Head

Carriage

Replacement

(Continued)

Figure

4-24B Head

Cable

,..---

Routing

PWB

shield

plate

T5-021-013087

•••

01

CoDDeCtor

Figure

4-24C Head Cable Routing

4-30

4.5.2 Stepping Motor and

Steel

Band

Replacement

Tools Required: Phillips Screwdriver,

Phillips Screwdriver, M2.6 Allen Wrench, 1.5mm Tweezers Alcohol and Gauze Screw Lock Liquid Exerciser

Refer

1. Remove

2.

3.

4. Remove the screws holding

5. The head

6. Remove fixing

to

Figure 5-5.

the

Remove

circuit Unplug

plate

two fixing carriage

carriage

card

all

(item

to relieve

assembly.

shield

the

mounting screws from

(item

connectors

23).

carriage

plates

(A

plates,

(AVA

cover

43). at

the

assembly

and

the

tension, and

A and

409 or equivalent)

assembly

main

the

(item

B).

Press

B,

M3

(item

circuit

main

7)

and

fixing

detach

and

44).

the

main

card

circuit

steel

plate the

the

band spring

circuit

assembly and remove

card

shield

band

B (item

steel

band from fixing

(item

12)

(item

card

plate

11) and

13) from

and

and remove

are

the

lift

up

the

card.

connected

lower head

plate

the

B.

head

the

by

7. Remove remove

B.

Remove

9. Remove holds

10. Insert

Note:

11. Temporarily coil the

12.

Connect by reversing

13. Move the head to

the

straight.

14. Install in

step

the

mounting screws for

the

band washer and

the

stepper

the

screw fastening

the

stepping

the

new stepping

When

must also

stepping

replacing

be

motor

the

steel

the

specified torque. The band must have tension and remain

Use

care

the

main

4.

the

steel

band.

motor

replaced.

the

with

band and head

procedures described in

carriage

to

circuit

mounting screws.

the

- and

motor

the

new

the

keep

card

then

and hold

stepping motor,

steel

band washer and head

manually, then

the

surfaces

shield

STM

remove

band

carriage

plate,

stepping motor pulley

bracket

the

it

in place with

the

to

the

- with band fixing

steps

tighten

of

the

by reversing

(item

stepping motor.

steel

stepping

carriage.

5 and 6.

the

band and pulley clean.

4) -the

its

band and

motor

steel

the

(item

mounting screws.

the

pulley, and install

plates

band mounting screws

procedure described

3), then

STM

bracket

band spring

A and B -

perfectly

TS-021-0130B7

•••

01

4-31

4.5.2 Stepping Motor and the

main

15. Install

circuit

Steel

card

Band

Replacement

by reversing

steps

(Continued)

2 and 3.

16. With

17. Adjust

the

exerciser, seek between Track 00 and

the

steel

band

unit and

readjust

holding screw

track

stays

to

straight.

the

band.

the

specified torque.

If

the

After

band does

each adjustment of

alignment (paragraph 4.4.10).

lB. Adjust Track 00 sensor (paragraph 4.4.11).

the

19. Install

4.5.3 Spindle Motor

Tools Required: Phillips Screwdriver,

shield cover assembly.

Replacement

M3 Tweezers Wire

Cutters

Refer

1. Remove

2.

to

Figure 5-5.

the

Remove

circuit

the

card

and remove

shield

cover

(item 44).

mounting screws from

(item

the

43), unplug all connectors

card.

the

main

at

the

innermost

not

stay

circuit

the

main

track

straight,

the

band,

card

and

circuit

and ensure

shut

tighten

lift

card

assembly

off

up

the the

the

3. Remove plate

(item 23).

4. Remove the remove

5. Carefully motor

by

new spindle is

Note:

6. Adjust

7. Check

B.

Use

the

Check disk

9. Inspect and adjust

screws holding

three

the

spindle

insert

reversing

parallel

extreme

collet

write

rotational

spindle

motor

the

new spindle

the

caution

assembly (paragraph 4.4.1).

protect

speed (paragraph 4.4.5).

track

10. Inspect and adjust Index

the

11. Install

shield cover assembly.

the

main

motor

from

circuit

mounting screws (from

the

rotor

motor

card

(circuit

into

the

procedures described in

to

the

chassis.

to

avoid scratching

the

sensor (paragraph 4.4.4).

alignment (paragraph 4.4.10). burst

timing (paragraph 4.4.13).

shield

plate

the

and remove

spindle side) and

card) side.

chassis, install a new spindle

steps

surfaces

2 through 5. Ensure

of

the

spindle.

the

TS-021-0130B7

•••

01

4-32

4.5.4

Collet

Assembly

Replacement

Tools Required: Phillips Screwdriver,

Tweezers Screw Lock Liquid

Refer

1. Remove

2. Remove

3. Remove

4. Install a new

5. Adjust

6. Inspect and

7. Install

to

Figure 5-5.

the

shield

the

two screws fastening

the

remove

removal procedures given in

described in paragraph 4.4.1 and torque.

the

collet

adjust

shield

position of

cover

E-ring

actuating

collet

track

cover

assembly

(item

517) on

plate

assembly, washer and pressure spring by reversing

steps

the

center

alignment (paragraph 4.4.10).

assembly.

M3

(item

the

collet

the

with

its

2 and 3.

of

the

tighten

44). shaft

collet

washer and

collet

the

mounting

plate

actuating

assembly

plate

pressure

assembly using

screws

(item

spring.

the

to

the

30).

29) and

the

procedure

specified

4.5.5 Sensor Block Tools Required: Phillips Screwdriver,

Refer

1. Remove

2. Remove

3. Remove

4. Remove

5. Install a new sensor block

6. Adjust

7. Inspect and

to

Figure 5-5.

the

circuit and remove

plate

sensor block

card

(item

the

Replacement

Tweezers Screw Lock Liquid

shield

the

(item

the

23). two screw holding

(item

Track

adjust

cover

mounting screws from

43), unplug all

card.

screws holding

15).

00

track

(item

by

sensor (paragraph 4.4.11).

alignment (paragraph 4.4.10).

44).

the

reversing

M3

the

connectors

main

circuit

sensor block

the

removal procedure.

main

at

card

circuit

the

shield

to

card

main

the

chassis and remove

circuit

plate

and

card

and remove

lift

up

assembly

the

TS-021-013087

•••

01

4-33

4.5.6 Main Circuit Card Replacement

Tools Required: Phillips Screwdriver, Refer

1.

2.

3. Remove the screws holding

4. Install a new main

Note:

5.

6. Check asymmetry (paragraph 4.4.7).

7. Check

to

Figure 5-5.

Remove

Remove circuit and remove

plate

given above in

Set the

the

card

(item

The Main correct

the

removed

23).

circuit

read

shield cover

(item

the

Drawing Number from

level (paragraph 4.4.8).

(item

mounting screws from

43), unplug all

card.

circuit

steps

2 and 3.

Circuit

card selection jumpers in

card

(refer

Card

to

44).

connectors

the

main

card

assembly by reversing the removal procedure

is available

Figure 4-1, Table 4-5).

M3

the

main

at

circuit

at

different

replaced

the

circuit

the

card

shield

circuit

same positions as they were

card

main

revision levels,

card.

and

circuit

plate

and remove

lift

card

up

assembly

obtain

the

on

8. Check read resolution (paragraph 4.4.9).

9. Check Track 00 sensor (paragraph 4.4.11).

10.

11.

Replace

Connect

the

shield cover assembly.

the

disk drive

to

the

system

and

perform

an overall

test.

4-34 TS-021-013087

•••

01

4.5.7 Write

Protect

Sensor

Replacement

Tools Required: Phillips Screwdriver,

Screw Lock Liquid

Refer

1.

2.

3. Remove

4.

5. Adjust

6. Adjust Index

7.

4.5.8

Tools Required: Phillips Screwdriver,

Refer

to

Figure 5.5.

Remove Disconnect

Install steps

Install

Bezel

to

the

1 through 3.

the

Replacement

Figure

shield

the

three

new sensor block assembly by reversing

new Write

burst

shield

cover

sensor block

mounting

timing (paragraph 4.4.12).

cover

assembly

connector screws

Protect

assembly.

sensor (paragraph 4.4.4).

5-5.

M3

(item

(J7).

and

M3

44).

the

sensor block assembly

the

(item

procedures

24).

described in

1.

Turn assembly (paragraph 4.5.9).

2. Remove pulling

3. Install

Note:

4.5.9 Tools Required: Refer

1.

Turn remove

Install

2.

Note:

the

front

the

it

forward.

the

new Bezel by

When installing chassis and

Front

to

Lever

Figure 5-5.

the

front

the

front

the

new

When installing D hole

wi

lever

Bezel's mounting

tighten

Assembly

Tweezers

front

th

lever

the

clamp

(item

reversing

the

new Bezel,

the

to

from lever the

front

42)

to

the

open position and

screws

the

mounting

its

open position,

the

disk drive.

assembly by reversing

lever

shaft.

(item

procedures

press

screws

assembly,

both sides

to

remove

S13) and

given in

the

specified

the

be

sure

remove

the

steps

of

the

E-ring

removal

to

align

the

front

Bezel

torque.

procedure.

(item

1 and 2.

Bezel

(item

the

front

against

lever

41) by

the

S17) and

lever's

TS-021-013087

•••

01

4-35

4.5.10 Clamp

Cam

Replacement

Tools Required: Phillips Screwdriver,

M3 Tweezers Lubricant (Nippon

Refer

to Figure 5-5 •

. 1. Turn the front lever to

its

Koyu

open position and remove

disk drive (paragraph 4.5.9).

2.

Remove it

forward.

the

Bezel's screws (item S13) and then

3. Remove the door lock spring, remove assembly (item 31).

4. Install

5. Adjust (item S20).

the

new clamp

the

cam

assembly

slack in the clamp

Coat

the

part

that

by

shaft

contacts

with lubricant.

6. Install

Note:

the

Bezel and Front Lever by reversing

When

there is a head load mechanism,

spring, shown

in

Figure 4-25,

are

Ltd. H-IO or HH-17, or equivalent)

the

front lever from

the

Bezel (item 41) by pulling

the

E-ring, and remove

reversing

the

removal procedure.

the

clamp

to 0.05 - 0.2mm by using washers

the

clamp cam and

the

removal procedure.

the

door lock

set

arm (item 28)

cam

and door lock

omitted.

the

cam

Door

lock

CUI

Clamp

CUI

Figure 4-25 Clamp Cam Assembly

Clamp

sbaft

4-36

TS-021-013087

•••

01

4.5.11 Head Load Solenoid

Replacement

Tools Required: Phillips Screwdriver,

Allen Wrench, 1.5mm

Refer

1.

2. Remove

3. Remove

4. Remove

5. Install

6.

to

Figure 5-5.

Remove

circuit

and remove

plate

the

card

the

(item

the

shield

mounting screws from

(item

the

card.

screws holding

23). two screw holding

solenoid assembly

the

new solenoid assembly

Refer

height of

to

Figure 4-26. Use

the

chassis and top of

cover

(item

44).

43), unplug all connectors

the

(item

32) from

the

temporarily tighten.

7. Adjust

the

head load solenoid (paragraph 4.4.13).

M3

the

main

at

main

circuit

card

head load solenoid

chassis.

by

reversing

head load

the

adjustment

vertical

circuit

the

shield

main

card

circuit

plate

bracket

removal steps.

screw

rod

to

0.68" (17.3mm) and

and

lift

up

card

assembly

and remove

to

adjust

the

TS-021-013087

•••

Upper

Figure 4-26 Head Load Height

01

4-37

Top & bottoa

an

Adjustment

plate a ••

eably

4.5.12 Door Lock Solenoid Replacement

Tools Required: . Phillips Screwdriver,

Phillips Screwdriver,

Refer

1. Remove the shield

2. Open

3. Remove

4. Remove

to

Figure 5-5.

the

front

cover

lever and remove

bezel

(item 44).

(paragraph 4.5.8).

mounting screws and

M2 M3

the

front

lever

the

door lock solenoid

Figure 4-27.

5. Install a new door lock solenoid by reversing

Lock

Clamp

lever

cam

assembly

assembly (paragraph 4.5.9).

(item

the

removal procedure.

39).

Refer

to

tfount screw

Figure 4-27 Door Lock Solenoid

4-38

TS-021-013087

•••

01

MAINTENANCE DRAWINGS AND PARTS LISTS

5.1 CONSTRUCTION

SECTION 5

illustrated

As assemblies

Top

Level

Disk Drive

in

listed

Figures

in Table 5-1.

5-1 through 5-5, M255XK Disk Drives include

Table

Intermediate

Transport

5-1 M255XK Assembly

Level

Components

Olart

Bottom

Chassis Upper Chassis Assembly Spindle Motor Stepping Motor Clamp Collet Track Bail Assembly

Level

Cam

Assembly

00 Block Assembly

the

major

Head

Main

Sensor Block Assembly

Carriage

Circuit

Assembly

Card

Assembly

Front Front Steel Head Load Assembly Door Lock Assembly

Read/Write

Electronic

Sensors

Bezel Lever

Band

Components

Assembly

Heads

TS-021-013087

•••

01

5-1

Shield

cover

IIOUnt

aslS8lllbly

screw

-~~

Sensor

Hain

PWB

shield

PWB

block asselllbly

Collet

assembly

plate

assembly

--~-IJI!"'--

--~-~~

--~-..;.:.;...

--...;--.

......

Shield

Hain

PWB

cowr

PWB

shield

.ount

assembly

IK)UDt screw

plate

screw

Clamp

Front

Protect

cam

Front

lever

PWB

assembly

bezel

assembly

Figure 5-1 Top View

~~ar~~II-

-_o..!

-~~~~I~I

Upper

.....

chassis

Solenoid

~~~-1~~

of

Disk Drive (View 1)

...

.p.~"""""'iL""'"

~--

Disk Drive motor

5-2

Solenoid

Stepping IIOtor

<llassis

TS-021~013087

•••

01

Sensor

PWB

block

assembly

Lock

Protect

Disk Drive

lIOunt screw

lever

assembly

mount screw

Solenoid

mount screw

LED

PWB

Bail

assembly

lIOunt screw

.otor

assembly

PWB

assembly

Upper

lIIOunt

chassis

.aunt

chassis

screw

T5-021-013087

•••

Figure

01

5-2

Top View

of

5-3

Disk

Drive

motor

(View

2)

Stepping

motor

Hounting

leg

~~~~~;;~~

.ou.nt

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

screw

80Wlt

Mounting

80Wlt

screw

leg

screw

Figure

5-3

Bottom

5-4

View

of

Disk

Drive

TS-021-013087

•••

01

:J

to

· • ·

)1

I I

L J

r-,

(

M255xK

'-'

ci

T5-021-013087

Figure 5-4

•••

01 5-5

Rear

View

of

M255XK

Figure 5-5 Exploded View Drawing

5-6

T5-021-013087

•••

01

5.2 STRUCTURAL PARTS USTING Refer

Item

Number

to

Table 5-2.

Table

Drawing Number

1 J2-5196

Item

Numbers

5-2

Usting

Name

of

are

of

Part

shown in Figure 5-5.

Structural

Chassis 1 2 J2-5294 Spindle Motor (Type 790PX) 3 J3-5295 Stepping Motor (Type 39SH)

J3-5296 Stepping Motor (Type MSJC)

4 J4-5661

5

J4-5662 6 J4-5663 7 JA3-5321A 8 J4-5671

STM

Bracket

Mounting Leg 2

Rubber Washer Head Guide

Carriage

Shaft

Assembly 1

(I)

Parts

Quantity

1 1

4

1

9 J4-5672

10

11

J4-5673

JA4-5674 12 J4-5030 13 14

J4-5031

J4..;5032 15 JA4-5717 16

J4-5678 17 JA4-5679 18 19 20 21

J4-5718

J4-5681

J4-5682

J4-5684

Guide Guide Steel

Band Fixing

Shaft Shaft

(II)

Retainer

Band Assembly 1

Plate

B Band Spring Band Washer Sensor Block Assembly Track

00 Sensor Assembly Upper Chassis Assembly Eject Eject

Lever Lever

Collar

Stop Spring Eject

Spring

1 1

1

1 1 1 1 1 1 1 1

22

JA4-5685

TS-021-013087

•••

01

Bail Assembly

1

5-7

5.2

STRUCTURAL

PARTS

LISTING

(Continued)

Item Number

23 24

25 26

27 28 29 30 31 32

Table 5-2 Listing

Drawing

Number

J3-S286

JA4-S71S JA4-5716 JA3-5265 J4-5253 JA4-5691 J3-5288 JA4-S695 JA4-5698

J4-5627

Name

Circuit

Write LED Card Assembly 1 Collet Assembly Pressure Spring 1 Set Collet Collet Clamp Shaft Assembly Solenoid

of

Structural Parts (Continued)

of

Part

Card

Shield

Protect

Arm Assembly

Actuating

Shaft

Plate

Bracket

Plate

Sensor

Plate

Assembly

Quantity

1

1 1 1 1

1 33 34 35 36 J4-S571 37 J3-5291 38 J4-S699 39 J4-5701 Solenoid 1 40 J4-5578 41 42 JA4-5708 43 J2-5207 Main 44 JA4-5709

Note 1 - Bezel and

contract.

Note 2 - The Main

correct

J4-5626 J4-5628 J4-5630

J2-5207

Drawing Number from

Operating Top and Bottom Top and Bottom Solenoid Door Lock Lever 1 Lever Collar

Return Spring Front Front

Shield Cover Assembly

Front

Circuit

Card is available

Plate

Plate Plate

Bezel (Note 1) 1 Lever Assembly 1

Circuit

Lever assemblies may be specified within

the

Card

replaced

Assembly 1 Spring 1

(Note

2)

at

circuit

different

card.

1

1 1

the

revision levels, obtain

sales

the

5-8 TS-021-013087

•••

01

5.3

SCREWS

AND

WASHERS

Refer

to

Table 5-3.

Item Drawing Number Number

51 52 53 9000-3004 Screw 54 55 56 9020-2504 57 9020-2605 Screw 58

9030-3006 9000-3003

9000-3006 9020-2003

9020-3004

Item

Table

Numbers

5-3

are

Listing

Part

Screw Screw

Screw Screw Screw

Screw

indicated

of

in

Figure

Screws and Washers

Diameter X Length in

M3

X 6

M3

X 3

M3

X4

M3

X 6

M2

X 3 M2.5 X 4 M2.6 X 5 M3

X4

5-5.

MM

59 510 511 512 513 9066-3008 514 515 9010-3005 516 9565-2002 Screw 517 518 519 S20A JZ4-0019 Washer S20B JZ4-0019

9020-3006 9068-3006 9068-3015 9066-3006

9060-2604

9820-0300 9820-0150 JZ4-0018

Screw Screw Screw Screw Screw Screw Screw

E-ring E-ring Washer

Washer

M3

X6 M3

X 1.5 M3

X 6 M3

X 8 M2.6 X 4 M3

X 5 M2

X 2 3mm

Diameter

1.5mm S.lmm

4.1mm

Diameter Diameter Diameter Diameter

x 0.3mm Thick x 0.2mm Thick x 0.35mm Thick

521

TS-021-013087

JZ4-0028

•••

01

Screw

5-9

M3

X 3

5.4

MAIN

CIRCUIT CARD COMPONENTS

Refer

Drawing Number

JA2-5259 JA2-5242 JA3-5373

J4-5534I J2-5260

J2-5208

JY4-0005 JY4-0542 JY4-0554

JY4-0537 JY4-0595

to

Table 5-4

5-4

of

Part

Circuit

Listing

Circuit

Table

Name

M2552K M2553/54K M2553K Rev 3

M2552A M2552K Main

M2553/54K Main

M2553K Rev 3 Main IC, M54578P IC, TD62503P IC,

MB433M

IC, HD7438

IC, M53238P

of

Card Assembly

Circuit

Card Label

Circuit

Main

Card

Board

Circuit

Assembly

Board

Card

Components

Quantity

1 Note 1 Note 1

1 1

1 1 IC2 1 IC3

I IC3 I IC3

Designation

Note N/A

Note Note Note

ICI

JY4-0555 JY4-0551

JY4-0138 JY4-0529

JY4-0140 JY4-0533

JY4-0577 JY4-0136 JY4-0152 JY4-0l49 JY4-01l5

.

JY4-01l6

JY4-0l46

IC, MB74LS32 IC, M74LS32P

IC, MB74LS08 IC, M74LS08P

IC, MB74LS74A IC, M74LS74

LSI, T5616

LSI,

CX20185 C-MOS, 74HC08 Filter,

Axial Lead Inductor

560 microhenry, LALO 3KH561K

Axial Lead Inductor

100 microhenry, LALO 3KHIOIK Ceramic

ZBF253D-"0l

Oscillator, 4

MHz

2 2

1 IC6 I

I IC7 1

I 1 IC9 I 2 2

2

1

IC4,IC5 IC4,IC5

IC6

IC7 IC8

ICIO L1, L3, L4

L5,

Xl

L2

L6

Note The Main

correct

Drawing Number from

Circuit

Card

is available

the

replaced

5-10

at

different

circuit

revision levels,

card.

TS-021-013087

obtain

•••

the

01

Table

Drawing Number

SAXR08812Q

5-4

Listing

Name

Transistor,

of

Main

Circuit

Part

2SA881 3

Card

Components

Quantity

(Continued)

Designation Ql,

Q2, Q3

JY4-0l41

JY4-0l42 JY4-0067A

JY4-0036 JY4-0l43 JY4-0035

CAMTIC103B

CANTIW333A CAJTIH330B

R-

Type Transistor,

R-

Type

Transistor,

Diode, lSS138

Diode Diode Diode

Ceramic

Ceramic Ceramic

Pair,

MA154WK 1

Pair,

MA156

Pair,

MA154WA

Cap,

Cap, Cap,

DTC1l4EF

DT

Al14EF

103M 16V 15

333N 12V 33PM

50V

5

1 DT4 10 D1, D2, D3, D4,

1 DA2 4 DA3, DA4, DA5,

2 C25, C26 2

DTl,

DT2, DT3

DT5, DT6

D5, D6, D7, D8, D9, DID

DAI

DA6 Cl,

C4, C5, C7, C8, C9, Cll,

C12, C13, C19, C35, C36, C37

C15, C16

C6, CI0,

CDZUIHI04A

CAKTIH27IB CAKTIHIOlB CAKT1HI02B CEME1C106E CEME1C226E CEMEIH334E CEME1H105E CEMEIC336E CEMEIC476E

TS-021-013087

Ceramic

Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic

•••

01

Cap,

104Z

Cap,

270PF

Cap,

100PF

Cap,

IOOOPF

Cap,

10 uf I6V Cap, 22 uf 16V Cap, 0.33 Cap,

1 uf Cap, 33 Cap,

47 uf 16V

50V

50V 50V

50V

uf

5-11

uf

16V

50V

5 C23, C29, C30,

C32, C33 2 C24, C27 1 C28 I I C2 I C3 2 C14, 3 C17, C22, C38 I 1

C3I

CI8

C21

C34

Drawing Number

Table 5-4 Listing

of

Name

Part

of

Main

Circuit Card Components (Continued)

Quantity

Designation

RDJR23100A

RDJR2315lA

RDJR23221A

RDJR23431A

RDJR23561A

RDJR23102A

RDJR23222A

RDJR23242A

RDJR23272A

Carbon 10 Ohm

Carbon

Resistor

1/5

Resistor

150 Ohm Carbon

Resistor

220 Ohm Carbon

Resistor

430 Ohm Carbon

Resistor

560 Ohm Carbon

loOK Carbon

Resistor

Ohm

Resistor

2.2K Ohm Carbon

Resistor

2.4K Ohm Carbon

Resistor

2.4K Ohm

W

,;t5%

1/5

W

,;t5%

1/5

W

,;t5%

1/5

W

,;t5%

1/5

W

,;t5%

1/5

W

,;t5%

1/5

W

,;t5%

1/5 W 2:5%

1

9

R55, R56

RI

Thru R8, RIO

2 R24, R37

1

R40

R33

3 R25, R34, R66

6 R14, R15, R21,

R22, R45, R62

2

R47, R50

1 R54

RDJR23302A

RDJR23362A

RDJR23472A

RDJR23103A

RDJR23123A

RDJR23223A

Carbon

Resistor

3.0K Ohm Carbon

Resistor

3.6K Ohm Carbon

Resistor

4.7K Ohm

Carbon

Resistor

10K Ohm

Carbon

Resistor

12K Ohm

Carbon

Resistor

22K Ohm

1/5 W 2:5%

1

14

R46

R51

RU,

R13, R20, R27, R28, R29, R30, R31, R32, R36, R39, R59, R63, R64

3

1

R23, R53, R38

R44

R68

5-12 TS-021-013087

•••

01

Table 5-4 Listing

Drawing Number Name

of

Part

Main

Circuit Card Components (Continued)

Quantity

Designation

ROJR23473A

ROJR23513A

ROJR23104A

RNFRF300lA

RNFRF4121A

RNFRF2432A

RNFRF2742A

RNFRF2942A

RSJF3030lC

Carbon

47K Ohm Carbon

51K Ohm Carbon

lOOK

Metal

3K Ohm

Metal

4.12K Ohm Metal

24.3K Ohm Metal

27.4K Ohm Metal

29.4K Ohm

Metal

Resistor

1/5

Resistor

1/5

Resistor

Ohm

Film

1/5

Film

Oxide

1/5

Resistor

Resistor 1/5 W :t

300 Ohm 1 W

W:t5%

W :t5%

W ± 5 %

Film

Resistor

+ 5 %

5 %

2 R18, R26

7

R12, R17, R19, R48, R49, R60, R61

2

1

Rl,

R53

R52

R16

1 R43

1 R41

1 R42

1

R57

RSJF30471C

Metal

470 Ohm 1 W JY4-0128 JY4-0544 JY4-0579 JY4-0580 JY4-0581 Base JY4-05B2 Base JY4-0l51E JY4-05B3

Block

Post

with

Base

Post,

Base

Post, Post, 5 Pin Post,

Shorting

JY4-0547 Shorting

TS-021-013087

•••

01

Oxide Film

Header,

Resistor

+ 5 %

12 Pin 1

Base, 2 Pin 2

2 Pin

4 Pin

6 Pin 2 Connector Connector Connector

1 Row, 5 Pin 1 SM1, SM2, 300

2 Row, 14 Pin 1 OSO/3, HO, HM, 2 Row, 8 Pin 2

5-13

1

R58

JB

J6, 1 J5 1 1

J7

J3

J4,

IN

LD,LC,LB,LA

JlO

J9

USE, HL, TO,

TM

MR

Table 5-4 Listing

Drawing

Number Name

of

Part

Main

Circuit

Card

ComPonents (Continued)

Quantity

Designation

JY4-0548

JY4-0151B JY4-0151C

JY4-0596 JY4-0077 JY4-0078 JY4-0021

JY4-0022 JY4-0514

JY4-0515

Shorting Connector 2 Row, 6 Pin 3 DC, RY, DO

DMl,

HD, 2SP, LSP Shorting Connector 1 Row, 2 Pin Shorting Connector 1 Row, 3 Pin 5 DL1,

3 Row, 3 Pin

Shorting Connector 1 Row, 7 Pin 1

Shorting Bar J2 Connector and Band J2 Connector without Band 1 J2

Band for J2 Connector J2 Connector without Ban

Band for J2 Connector 1

1

AIR

1

1 J2 1

DL

MS,

DK2, DK2

TP1-

AIR

J2

MOD

DL2

I RI,

MM

I DSR, STR

TP7

I DM2,

IISP,

DI

5.5

CIRCUIT

In

the

following

Resistance (R) is given in Ohms, with a power

tolerance

Resistor Arrays (RA)

tolerance Capacitors

Tolerance (for Resistors, Resistor Arrays and Capacitors)

CARD

rating

rating of ± 5%.

= ± 2%, K = ± 10%, M = ± 20%, Z = + 80% and - 20%.

G

LAYOUT AND SCHEMA TIC DIAGRAMS

schematic

of ± 5%.

(C)

are

drawing, unless otherwise indicated:

are

rated

given

in picofarads with a voltage

in

Ohms, with a power

rating

are

of

rating

of

50 volts.

coded

1/6

of

Watt

1/5W

as

follows:

and a

5-14

TS-021.013087

•••

01

OK1

~:

OK2

OSR STR

----f----+-t----+

•

i~i

::~

.1'

o

HS

MM

i

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TM

r:-r:l-:-r=l

U:l:l:J

INU

HL

HM

LA

LB LC

Figure 5-6 M2552K Revision 1

HS

Circuit

o o

Card

Layout

T5-021-013087

•••

01

5-15

DM2

DM1

MOD

PC I AT

CONF'

lOUR

AT

ION

(MOVE

ABLE)

Figure

5-7 M255J/54K Revision 2

Circuit

Card

Layout

5-16

T5-021-013087

•••

01

DM10M2

EIJ

E:::J

I·

1&1(::)

DSR

STR

PCI

AT

CONFIGURATION

~K

• •

HS HM

(FDCED)

c

0 0 0

~

i~

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TM

5M2

SM1

i

D

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Figure 5-8 M255JK Revision J

Circuit

Card

Layout

TS-021-013087

•••

01 5-17

r--·---- - --- - -- -

:00

MOTOR

1M'

~

ASS·Y

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TS-021-013087

•••

01

Figure

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Schematic

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5-19

5-20

T5-021-013087

•••

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TS-021-0130B7

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01

5-21

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