TECHNICAL PROCEDURES VOLUME FIVE

P/N: 072-0062

Copyright 1983 by Apple Computer, Inc.

Revision: June, 1987

Apple Technical Procedures Volume Five Table of Contents

--Title page (contains build date)

Disk II
--Table of Contents 02/87
--Take-Apart 02/87
--Troubleshooting 02/87
--Adjustments 02/87
--Preventive Maintenance 02/87
--Illustrated Parts List 02/87
(except pages 5.4, 5.5) 06/87

Disk III
--Table of Contents 02/87
--Take-Apart 02/87
--Troubleshooting 02/87
--Adjustments 02/87
--Preventive Maintenance 02/87
--Illustrated Parts List 02/87
(except pages 5.2, 5.3) 06/87

ProFile
--Table of Contents 03/86
--Data Recovery 06/85
--Troubleshooting & Exchange Procedures 03/86
--Illustrated Parts List 02/86
(except page 3.9) 10/86
--Appendix 03/86

DuoDisk
--Table of Contents 02/87
--Basics 02/87
--Take-Apart 02/87
--Adjustments 02/87
--Troubleshooting 02/87
--Preventive Maintenance 02/87
--Illustrated Parts List 02/87
(except pages 6.2, 6.3) 06/87
--Additional Procedures 02/87

Disk IIc
--Table of Contents 10/86
--Take-Apart 10/86
--Adjustments 02/87
--Preventive Maintenance 02/87
--Illustrated Parts List 04/87

Apple Technical Procedures Disk II

Technical Procedures

TABLE OF CONTENTS

Cover

Disk Drive Cable

Analog Card

Section 2 – Troubleshooting

Introduction

General Information

How to Use the Symptom Chart

Symptom Chart

Analog Card Troubleshooting

Materials Required

System Setup

Visual Inspection

Symptoms

System Will Not Boot

Drive Will Not Read or Write

Drive Has Trouble Reading

Drive Has Trouble Writing

Write-Protect Circuit Malfunctions

Section 3 – Adjustments

3.2 Introduction

3.3 DSPEED

3.4 Write Protect Switch

Section 4 – Preventive Maintenance

4.2 Introduction

4.2 Read/Write Head

4.3 Head Load Button

4.4 Motor Drive Belt

Section 5 – Illustrated Parts List

5.3 Finished Goods Assembly (Figure 1)

5.5 Internal Parts (Figure 2)

5.7 ICs (Figure 3)

©Apple Computer, Inc., 1982, 1984, 1985, 1986, and 1987. No portion of this document may be reproduced in any form without the written permission of Apple Computer, Inc.

Apple IIGS is a trademark of Apple Computer, Inc. Disk II, Apple, and the Apple logo are registered trademarks of Apple Computer, Inc.

Apple Technical Procedures Disk II

Section 1 - Take-Apart

CONTENTS

1.3 Cover

1.4 Disk Drive Cable

1.4 Analog Card

Note: If a step is underlined, detailed instructions for that step can be found elsewhere in this section.

COVER

Materials Required #2 Phillips screwdriver

Remove

1. Turn the drive upside down and remove the four Phillips screws.

2. Set the door end of the unit down on a protective pad.

3. Slide the cover up until it clears the interior parts of the drive. Set the cover aside and set the unit down on its base again.

Note: If the vent covers (inside the housing) get caught on the frame while you are removing the cover, gently pry them away from the frame while continuing removal. After removal, smooth out any tear or bubble in the covers.

Replace

1. Set the door end of the unit down on a protective pad.

2. Slide the cover down over the drive.

3. Turn the drive upside down and replace the four screws.

DISK DRIVE CABLE

Materials Required

2 Phillips screwdriver

Remove

1. $ \underline{\text{Remove the cover.}} $

2. Release the catch on the nylon cable holder (mounted on the inside of the back plate) by pressing the tab toward the back of the unit.

Replace

3. Disconnect the cable from the analog card and lift the cable free of the drive.

4. Place the cable into the nylon cable holder so that the toroids (donut-shaped ferrite pieces) are just below the cable holder, and snap the holder shut.

5. Attach the ribbon cable plug to the connector on the analog card, making sure that both rows of pins align with the holes in the plug and that the arrow on the plug points to pin 1 on the connector. (The cable should exit away from the analog card.)

6. $ \underline{\text{Replace the cover.}} $

ANALOG CARD

Materials Required

2 Phillips screwdriver

Remove

1. $ \underline{\text{Remove the cover.}} $

2. Gently disconnect the read/write head connector from the front of the analog card (Figure 1, #1).

3. Disconnect the ribbon cable from the rear of the card (Figure 1, #2).

4. Disconnect the motor connector from the rear of the card (Figure 1, #3).

5 3 4 1 2 4

FIGURE 1

6. Slide the card forward past the retaining slots at the rear (Figure 1, #5), and then lift it out.

Note: These screws may have either standard or metric threads. To avoid intermixing, keep the screws with the disk drive they were taken from.

5. Remove the two screws at the front of the analog card (Figure 1, #4).

6. Slide the card into position in the retaining slots of the rear support posts (Figure 1, #5).

7. Reinstall the two screws (Figure 1, #4) to hold the card in place.

8. Reconnect the read/write head connector (Figure 1, #1) to the card. Make sure that there is just enough loop in the cable so that it doesn't pull down on the head connector.

9. Reconnect the motor connector