Tandon TM100-1 Service-Handbuch

Andere Handbücher für TM100-1

1

Dieses Handbuch passt für folgende Modelle

1

Inhaltsverzeichnis

Andere Tandon Gleichstromantrieb Handbücher

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O E M

OPERATING AND SERV ICE MANUAL

TM100-1, TM100-2 DISK DRIVES

48 TRACK S PER IN CH

landon

c o r p o r a t io n

20320 PRAIRIE STREET

CHATSWORTH, CALIFORNIA 91311 © COPYRIGHT 1983 TANDON CORPORATION

NOTICE

This document, and the information contained herein, is copyright by Tandon Corporation and may

not be duplicated or reproduced, in whole or in part, without the prior written approval of

Tandon Corporation.

This document is intended to provide the user with detailed information adequate for the efficient

installation, operation, and service of the equipment involved.

However, while every effort has been made to keep the information contained herein current and accu

rate as of the date of publication, no guarantee is given or implied as to its accuracy.

C O N T E N T S

Section Page

Number Title Number

SECTION 1 GENERAL DESCRIPTION

Introduction........................................................................... 1-1

1.1 Scope Of The Document .............................................................. 1-1

1.2 Purpose Of The Drive................................................................. 1-1

1.3 Major Features........................................................................ 1-1

Write P rotect

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

1-1

Daisy Chain Capability............................................................. 1-1

Internal Trim Erase................................................................ 1-1

Industry Standard Interface Compatibility....................................... 1-1

Track 0 Switch

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

1-2

Index Sensor........................................................................ 1-2

Activity Indicator.................................................................. 1-2

1.4 Functional Description............................................................... 1-2

1.5 Physical Description ................................................................. 1-2

SECTION 2 PRODUCT SPECIFICATIONS

Introduction........................................................................... 2-1

2.1 Mechanical Specifications

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

2-1

2.2 Electrical and Operational Specifications

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

2-1

2.3 Reliability Specifications............................................................. 2-1

2.4 Environmental Specifications

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

2-1

SECTION 3 OPERATION

Introduction........................................................................... 3-1

3.1 Unpacking The Drive................................................................. 3-1

3.2 Preinstallation Checkout

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

3-1

3.3 Mounting The Drive.................................................................. 3-1

Dust Cover.......................................................................... 3-2

Cooling ............................................................................. 3-2

3.4 Interface Connections ................................................................ 3-2

Input Control Lines ................................................................ 3-2

Output Control Lines............................................................... 3-4

Typical Interface Characteristics.................................................. 3-4

3.5 D. C. Power............................................................................ 3-5

3.6 Drive Address and Option Patching.................................................. 3-5

DSO Through DS3 Jumpers

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

3-5

MX Jumper......................................................................... 3-7

HS and HM Jumpers............................................................... 3-7

Power Save Option................................................................. 3-7

Side Select (Wl)

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

3-7

Write Flip-Flop Control (W2, W3) ................................................. 3-7

Write Protect Control (W4, W5)................................................... 3-7

Activity L.E.D. Control (W6, W7, W9)

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

3-7

Drive Select 3 Enable (W8)

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

3-9

Door Lock Solenoid (W10)

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

3-9

C O N T E N T S

Section Page

Number Title Number

3.7 Diskettes............................................................................... 3-9

Loading The Diskette .............................................................. 3-9

Write Protect Tab.................................................................. 3-9

Diskette Handling and Storage.................................................... 3-9

SECTION 4 THEORY OF OPERATION

Introduction........................................................................... 4-1

4.1 Data Recording

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

4-1

4.2 Components Of The Drive

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

4-3

4.3 Generate and Interpret Control Signals

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

4-3

Index Sensor

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

4-3

Write Protect Switch............................................................... 4-3

Track 0 Switch..................................................................... 4-3

Drive Select

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

4-3

4.4 Read/Write Head Positioner........................................................ 4-5

Step and Direction................................................................. 4-5

Stepper Motor Control

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

4-5

Stepper Motor

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

4-5

4.5 Read/Write D ata

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

4-7

Read/Write Head Assembly....................................................... 4-7

Side Select Circuits ................................................................ 4-7

Write/Erase Circuits............................................................... 4-7

Read Data Circuits............................................................... 4-10

4.6 Spindle Control...................................................................... 4-10

Spindle Motor and Spindle Assembly

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

4-10

Spindle Motor Enable Circuit

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

4-10

Spindle Motor Control Circuit..................................................... 4-12

SECTION 5 MAINTENANCE CHECKS AND ADJUSTMENTS

Introduction........................................................................... 5-1

5.1 Visual Inspection

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

5-1

5.2 Equipment Required ............................................................... 5-1

5.3 Power/Drive Select Check.......................................................... 5-2

5.4 Write Protect Switch Check and Adjustment

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

5-3

Write Protect Switch Check

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

5-3

Write Protect Switch Adjustment

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

5-3

5.5 Drive Motor Speed Check and Adjustment

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

5-3

Drive Motor Check................................................................. 5-3

Drive Motor Adjustment

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

5-4

5.6 Radial Track Alignment Check and Adjustment .................................. 5-4

Radial Track Alignment Check

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

5-6

Radial Track Alignment Adjustment

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

5-8

5.7 Index Checks and Adjustment

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

5-9

Index-To-Data Pulse Check

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

5-9

Index Sensor Adjustment

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

5-9

5.8 Azimuth Check...................................................................... 5-11

5.9 Track 0 Switch Check and Adjustment............................................. 5-12

Track 0 Switch Ch eck............................................................ 5-12

Track 0 Switch Adjustment

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

5-12

5.10 Track 0 Stop Adjustment........................................................... 5-13

C O N T E N T S

Section Page

Number Title Number

5.11 Head Output Check

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

5-13

5.12 Cone Centering Check

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

5-14

5.13 Compliance Check and Adjustment (Single-Sided Drives)

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

5-15

Compliance Check

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

5-15

Compliance Adjustment ......................................................... 5-15

SECTION 6 TROUBLESHOOTING GUIDE AND REPLACEMENT PROCEDURE

Introduction......................................................................... 6-1

6.1 Symptom Diagnostic Techniques

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

6-1

6.2 Soft E rrors.......................................................................... 6-1

6.3 Troubleshooting Guide ............................................................. 6-1

6.4 Replacement Procedures ........................................................... 6-5

Tool Requirements.....................

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

6-7

Drive Belt ........................................................................ 6-7

Logic Circuit Board .............................................................. 6-7

Servo Circuit Board.............................................................. 6-9

Cone Lever Assembly ............................................................ 6-10

Cone Assembly.................................................................... 6-13

Activity L.E.D

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

6-13

Front Panel....................................................................... 6-16

Guide R a il........................................................................ 6-16

Index Assembly................................................................... 6-17

Drive Motor Assembly ........................................................... 6-20

Track 0 Switch Assembly ........................................................ 6-22

Write Protect Switch Assembly ................................................. 6-25

Upper Arm Assembly (Single-Sided Drives Only)............................... 6-27

Head Module Assembly .......................................................... 6-27

Latch Plate Assembly............................................................ 6-31

Appendix A Recommended Spares and Major Assemblies

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

A-1

Appendix B Circuit Board Schematics and Drawings

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

B-l

ILLUSTRATIONS

FIGURES

Figure Page

Number Title Number

1- 1 Disk Drive

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

1-3

2- 1 Disk Drive Outline Drawing........................................................ 2-2

3- 1 Electrical Interface Characteristics

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

3-5

3-2 Control and Data Timing Requirements ........................................... 3-6

3-3 Logic Board With Programmable Shunts and Option Patching Locations

........

3-8

3-4 Recording Media .................................................................... 3-10

3-5 Write Protect T a b ................................................................... 3-11

3- 6 Diskette Handling and Storage

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

3-12

4- 1 Electromagnetic Core

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

4-1

4-2 FM Recording Magnetization Profiles

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

4-2

4-3 Read Timing Diagram

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

4-2

4-4 Interconnect Block Diagram........................................................ 4-4

4-5 Soft-Sectored Index Pulse .......................................................... 4-6

4-6 Track 0 Timing...................................................................... 4-6

4-7 Write Data Circuit Block Diagram

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

4-8

4-8 Write Operation Timing Diagram

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

4-9

4-9 Read Circuit Block Diagram........................................................ 4-11

4- 10 Servo Circuit Board.................................................................. 4-12

5- 1 Logic Circuit Board With Test Points

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

5-2

5-2 Write Protect Switch Adjustment

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

5-4

5-3 Location Of R4 Speed Control Potentiometer

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

5-5

5-4 Bottom View Of D rive............................................................... 5-5

5-5 Hub Center Line and Track Locations

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

5-6

5-6 Cats Eye Patterns ................................................................... 5-7

5-7 Head Module Retaining and Cam Screws........................................... 5-8

5-8 Index-To-Data Pulse................................................................. 5-10

5-9 Index Sensor’s Retaining Screw and Adjustment

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

5-10

5-10 Optimum Head Azimuth Alignment

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

5-11

5-11 Head Azimuth Alignment of Acceptable Lower L im its............................ 5-11

5-12 Head Azimuth Alignment of Acceptable Upper Lim its............................ 5-12

5-13 Track 0 Stop

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

5-13

5- 14 Upper Arm and Screws

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

5-16

6- 1 Drive Belt and Pulleys............................................................... 6-7

6-2 Logic Circuit Board Mounting ...................................................... 6-8

6-3 Servo Circuit Board Mounting...................................................... 6-9

6-4 Cone Lever Cable Harnessing....................................................... 6-10

6-5 Cone Lever Assembly and Cable Harnessing

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

6-11

6-6 Cone Shaft and E-Ring

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

6-12

6-7 Cone’s Component Parts

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

6-14

6-8 Activity L.E.D. Cable Harnessing................................................... 6-15

6-9 Activity L.E.D. Assembly Retaining Collar and Grommet

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

6-15

6-10 Front Panel Locating Tabs and Bushings .......................................... 6-16

6-11 Front Panel Mounting Screws ...................................................... 6-17

6-12 Guide Rail Locating Tabs and Bushings

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

6-18

6-13 Index Emitter Sensor’s Mounting and Cable Harnessing .......................... 6-18

6-14 Index Detector Sensor’s Mounting Screw and Cable

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

6-19

6-15 Cable Harness

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

6-20

FIGURES

Figure

Number Title

Page

Number

6-16 Drive Motor Harnessing and Mounting ............................................ 6-21

6-17 Drive Motor Pulleys

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

6-22

6-18 Track 0 Cable Harnessing .......................................................... 6-23

6-19 Track 0 Adjustment Screw ......................................................... 6-24

6-20 Track 0 Mounting Screw............................................................ 6-25

6-21 Write Protect Mounting Adjustment Screws

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

6-26

6-22 Write Protect Cable Harness ....................................................... 6-26

6-23 Write Protect Arm and Adjustment Screws

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

6-27

6-24 Upper Arm Screws

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

6-28

6-25 Upper Arm Parts.................................................................... 6-29

6-26 Felt Pad On Upper Arm ............................................................. 6-29

6-27 Head Module Assembly............................................................. 6-30

6-28 Latch Plate Mounting

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

6-31

TABLES

Table Page

Number Title Number

2-1 Electrical and Operational Specifications............................................ 2-3

2-2 Reliability Specifications............................................................. 2-4

2- 3 Environmental Specifications ........................................................ 2-5

3- 1 Drive Interface Lines and Pin Assignments

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

3-2

3- 2 D. C. Power Connector Pin Assignments ............................................. 3-5

4- 1 Stepper Logic Truth Table............................................................ 4-5

6-1 Troubleshooting Guide

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

6-2

6-2 Checks and Adjustments Guide

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

6-6

SECTION 1

GENERAL DESCRIPTION

INTRODUCTION

This document provides required information in

order to evaluate and incorporate Tandon’s disk

drive into a system.

Tandon Corporation’s Model Number TM100-1

and TM100-2 are full-feature, 5-1/4-inch, flexi

ble disk drives. They are compact data storage

devices that use an ANSI-compatible, industry

standard, 5- 1/4-inch diskette.

Model Number TM100-1 and TM100-2 drives

each have forty-eight (48) tracks per inch. The

TM100-1 is a single-sided recording device. The

TM100-2 is a double-sided recording device.

Both drives are capable of reading and writing

in single-density format on a diskette, using a

proprietary read/write head patented by

Tandon. The drives have a double density capa

bility when Modified Frequency Modulation

(MFM) or other appropriate recording technique

is used. Encoding and decoding of the data is

done by the user’s controller.

1.1 SC O P E OF THE

DOCUMENT

This document contains the major features,

physical and functional specifications, mounting

and power requirements, the interface, and typi

cal timing characteristics of the TM100-1 and

TM100-2 drives. In addition, there is a theory of

operation, checks and adjustment procedures,

troubleshooting guide, replacement procedures,

assembly drawings, and schematics.

1.2 PURPOSE OF THE DRIVE

The TM100-1 and TM100-2 drives are rotating

disk memories designed for random access data

entry, storage, and retrieval applications.

Typical applications include intelligent terminal

controllers, microcomputers, word processing

systems, data communication systems, error

logging, program loading, and point-of-sale

terminals.

1.3 MAJOR FEATURES

WRITE PROTECT

When a write protected diskette is inserted into

the drive, the write electronics are disabled.

DAISY CHAIN CAPABILITY

The drive provides the address selection and

gating functions necessary to daisy chain a

maximum of four units at the user’s option. The

last drive on the daisy chain terminates the

interface. The terminations are accomplished by

a resistor array plugged into a DIP socket.

INTERNAL TRIM ERASE

The drive provides the control signals necessary

for proper trim erasure of data.

INDUSTRY STANDARD INTERFACE

COMPATIBILITY

The drive is compatible with controllers that use

an industry standard interface.

TRACK 0 SWITCH

The Track 0 switch is provided to generate a

logic level at the drive interface, indicating the

read/write head is positioned at the outermost

track.

INDEX SENSOR

An index sensor is provided to generate

electrical pulses at the drive interface

coincident with sensing Index/Sector holes on

the diskette.

ACTIVITY INDICATOR

An activity indicator, located on the front panel,

is automatically illuminated when the drive is

selected.

1.4 FUNCTIONAL DESCRIPTION

The drives are fully self-contained, and require

no operator intervention during normal

operation. Each drive consists of electronics to

generate and interpret control signals, a head

positioning system, a read/write system, and a

spindle drive system.

When the front latch is opened, access is

provided for insertion of a diskette. The diskette

is held in place by plastic guide rails. Its location

is ensured when the diskette is inserted until a

back stop is encountered.

Closing the front latch activates the cone

clamping mechanism, resulting in accurate

centering and clamping of the diskette. The

drive hub is held at a constant speed of 300 RPM

by a servo-controlled D. C. motor. The heads

remain in contact with the recording media

until the front latch is opened.

The heads are positioned over the desired track

by means of a four-phase stepper motor/band

assembly and its associated electronics. This

positioner uses a one-step rotation to cause a one

track linear movement.

Data recovery electronics include a low-level

read amplifier, differentiator, zero crossover

detector, and digitizing circuits. No data

decoding capabilities are provided.

The drive has the following sensors:

1. A Track 0 switch detects when the

head/carriage assembly is positioned at

Track 0.

2. An index/sensor is positioned to generate

a digital signal when an index/sensor

hole on the diskette is detected.

3. A write protect switch disables the write

electronics when a write protect tab is

applied to the diskette.

1.5 PHYSICAL DESCRIPTION

A representative drive is shown in Figure 1-1.

The drive can be mounted in a vertical or

horizontal plane. However, the logic circuit

board must be on the uppermost side when the

drive is mounted horizontally.

The spindle is belt driven by a D. C. motor with

an integral tachometer. The servo control

circuit and tachometer control the speed of the

spindle.

The read/write head assembly is positioned by a

split band positioner mounted to a stepper

motor. The read/write head(s) is a glass-bonded,

ferrite/ceramic structure with a life expectancy

of 20,000 operating hours.

The electronic components of the drive are

mounted on two printed circuit boards. The logic

circuit board is mounted above the chassis. The

spindle motor control circuit board is mounted

at the rear of the chassis. Power and interface

signals are routed through connectors plugged

directly into the logic circuit board.

1-2