Radio Shack TRS-80 Manual de usuario

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5-Meg Hard Disk Service Manual

——TRS-SO ®—;

TRS-80® 5-Meg Hard Disk

Service Manual

Catalog Number 26-1130

Radio HaelC

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5-Meg Hard Disk Service Manual

TRS-SO ®=—

—

TRS-80® 5-Meg Hard Disk Service Manual

Reproduction or use, without express written permission from

Tandy Corporation, of any portion of this manual is

prohibited. While reasonable efforts have been taken in the

preparation of this manual to assure its accuracy, Tandy

Corporation assumes no liability resulting from any errors

or omissions in this manual, or from the use of the

information obtained herein.

Radia/haalc

-2-

5-Meg Hard Disk -rrsea Qn ®Service Manual

Contents

Warnings

1/ Overview „a5

2/ Technical Specifications 7

3/ Connections 11

Model I15

4/ Power-Up and Power-Down 19

5/ Replacement Procedures .23

6/ Maintenance 25

7/ Theory of Operation ...29

Hard Disk Controller Board .... 34

8/ Troubleshooting the Power Supply (Secondary

Drive Only) 47

9/ Printed Circuit Boards 51

10/ Wiring Diagrams 53

11/ Parts List 57

12/ Schematics 63

13/ Supplement 69

Radie/haalf

-3-

5-Meg Hard Disk Service Manual

——TRS-BO ®———————

—

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

Warnings

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

Do not move or tilt the Hard Disk Drive unit while the drive

is running. Permanent damage to the drive may occur

resulting in the loss of information or damage to the disk.

Do not drop the Hard Disk Drive unit from any height as

permanent damage to the drive may occur.

Radio JTiaelf

-4-

5-Meg Hard Disk Service Manual

—«——~__«_TRS-SO *

1/ Overview

The TRS-80 5-Meg Hard Disk Unit consists of two

non-removable 5»25-inch disks,, There are four Read/Write

heads (one on each side of each platter) which move towards

or away from the center of the disk as needed.

The Disks and Read/Write heads are fully enclosed in a

sealed chamber .Aspecial air filteration system prevents

dust and other particles, which destroy data, from reaching

the disks oAnother filtering system allows pressure

equalization with the "outside" air pressure.

UNDER NO CIRCUMSTANCES MUST THE CHAMBER BE UNSEALED IN THE

FIELD* ACLASS 100 CLEAN ROOM ENVIRONMENT IS NEEDED FOR

UNDER-THE-BUBBLE REPAIR.

On all Hard Disk Units, flaws in the media are indentified

at the factory before the disk drives are delivered to the

customer .Attached to the bottom of each disk drive unit is

a"Media Error Map". This map identifies the flawed tracks

on that particular unit.

Radio /haek"

-5-

-6-

5-Meg Hard Disk Service Manual

2/ Technical Specifications

Basically, the hard disk unit consists of two platters (or

disks) lying parallel within the unit. There are also four

Read/Write heads, one on each side of each platter .These

heads move towards or away from the center of the disk as

needed.

When aunit is purchased, there will be no more than 3

tracks per head with defects .This will not exceed 8tracks

per drive with defects. Also there will not be any flaws on

Track 0*

Disks/Platters

Heads/Recording Surfaces

Tracks per Inch

Cylinders

Tracks

254

153

612

Hard Disk

Cylinders Tracks Sectors Bytes

153

1612

19,584 5,013,504

128 32,768

32 8,192

1256

AC Power Requirements

50/60 Hz +/- 0o5 Hz

100/115 VAC installations (90 to 127 V)

200/230 VAC installations (100 to 253 V)

Fuse 2.5 at 250 Volts (Internal)

Power Supply (Primary Drive) Operating Characteristics

Min Typ Max Units

Vin Range

Input Select 115V 90 115 135 Vrms

Input Select 230V 198 230 264 Vrms

Line Frequency 47 50/60 63 Hz

isi^to ff^Qfi

-7-

5-Meg Hard Disk

Output Voltages Vl +5V 4.95

V3 +12V 11.4

V4 -12V 11

Output Current Vl +5V 2.50

V3 +12V .75

V4 -12V .005

Ripple Voltages Vl +5V

V3 +12V

V4 -12V

Efficiency 70

Hold Up Time

Full Load, Low Line 10

Full Load, Norn Line 16

Over-Voltage Protection 5.80

®Service Manual

J©£a —J Volts

12 12 .

Volts

-12 -15 Volts

5.0 Amps

2.0 Amps

.10 Amps

50 mv

150 mv

150 mV

6.80

mSec

Volts

Power Supply (Secondary Drive) Operating Characteristics

Min Typ Max Units

Vin Range

Input Select 115V

Input Select 230V 95

180 115

230 135

264 Vrms

Vrms

Line Frequency 47 50/60 63 Hz

Output Voltages +5V

+12V

-12V

4.75

11.4

-11

-12 12.6

-15

Volts

Output Current +5V

+12V

-12V

.45

.75

.005 2.0

.10

Amps

Load Regulation

(measured by varying

load on considered output

from typ to either min or max

rated load) +5V 5

12V -5

-12V -8.3

jo /iaelf

-8-

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