IBM AT (TYPE 5170, TYPE 2/3), PC (TYPE 5150) 16-64KB (1817030 XM 474,1503388 536 XM,1817030 XM 366,1802453,1802461), PC (TYPE 5150) 64-256KB (6137403,1501480 XM 557), AT (TYPE 5170, TYPE 1) (6133920), XT (TYPE 5160) 64-256KB (6323560, 6323362, 6181655) IBM 5150-60-70 Service Manual

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Personal Computer

Family

Service Information

Manual

Preface

The purpose of this Service Information Manual (SIM) is to provide its user with the most frequently used service-related maintenance and reference information.

The SIM is not required to service the Personal Computer family of products. The SIM has been made available as a convenience to the user.

The SIM is divided into sections by product-specific information for each machine type with additional sections for general Personal Computer information.

This document can also be ordered by specifying Bill of Forms (BOF) 2481. Other items included in this BOF are diskettes, service summary cards, tabs, binders, and plastic diskette holders. Individual form numbers for these additional items are:

Diskettes IBM

AdvancedDiagnosticfor

IBMAdvancedDiagnosticfor

Service Summary Cards 5162 and 5170 Service Summary Card 5150, 5155, and 5160 Service Summary Card

the the

5150,

5155, and 5160, Version

5162

and 5170, Version 2.07

2.25

SA380033 SA38-0034

SA38-0035 SA38-0036

Printer Supplement Tabs Plastic Diskette Holders 5.25Inch (2 U/M)

First Edition (January 1989)

This major revision obsoletes The drawings and specifications contained herein shall not be reproduced in whole or in part without written

permission. IBM has prepared this Service Information Manual for the use of IBM customer engineers in the installation,

maintenance, or repair of the specific machines indicated. IBM makes no representations that it is suitable for any other purpose.

This publication could include technical inaccuracies or typographical errors. to the information herein; these changes will be incorporated in new editions of the publication. IBM may make improvements and/or changes in the product(s) and/or the program(s) described in this publication at any time,

SR28-0280-02.

SA38-0040 SA38-0038 SA38-0015

Changes are periodically made

Requests for copies of IBM publications should be made to your IBM representative or to the IBM branch office servicing your locality.

90A,

Address comments concerning the content of this publication to IBM Corporation, Dept. Internal Zip 4307, 951 NW 51st St., Boca Raton, Florida, U.S.A. 33432. IBM may use or distribute whatever information you supply in any way it believes appropriate without incurring any obligation to you.

References in this publication to IBM products, programs, or services do not imply that IBM intends to make these available in all countries in which IBM operates.

Bldg. 234-2,

INSTRUCTIONS

.bl

The

PersonaI

Tabs should be inserted at the beginning of each appropriate chapter.

Computer Family Service Information Manual

should be assembled in the following manner:

The plastic Summary Card Holder (located at the back of the tabs) should be inserted in Chapter 21, “Service Summary Cards.”

The Service Summary Cards should be inserted into the plastic Summary Card Holder.

Plastic Diskette Holders should be inserted in Chapter 20, “Advanced Diagnostic Diskettes.”

The Advanced Diagnostic Diskettes should be inserted in the plastic Diskette Holders.

The assembled manual should then be placed in the three-ring binder provided with this package.

Safety

L-J

The following information has been included in this publication for the use and safety of IBM personnel.

General Safety during Work

Use these rules to ensure general safety:

Observe good housekeeping in the area of the machines during maintenance and after completing it.

Use only field-supply items (such as adhesives, cleaning fluids, lubricants, paints, and solvents) that have been approved by IBM, that is, are supplied under an IBM part number.

When lifting any heavy object:

1. Ensure that you can stand safely without slipping.

2. Balance the weight of the object between your two feet.

3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.

4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the muscles in your back. Do

to lift any objects that you think are too heavy for you.

not attempt

Wear safety glasses when you are:

Using a hammer to drive pins or similar parts

Drilling with a power hand-drill

Using spring hooks or attaching springs

Soldering parts

Cutting wire or removing steel bands

Cleaning parts with solvents, chemicals, or cleaning fluids

Working in any other conditions that might be hazardous to your eyes.

Before you start the machine, ensure that other service representatives and the customer’s personnel are not in a hazardous position

After maintenance, reinstall all safety devices such as shields, guards, labels, and ground wires. Exchange any safety device that is worn or defective for a new one.

Remember: Safety devices protect personnel from hazards. You destroy the purpose of the devices if you do not reinstall them before completing your service call.

Reinstall all covers correctly before returning the machine to the customer.

A-l

Do not perform any action that causes hazards to the customer or that makes the equipment unsafe.

Put removed covers and other parts in a safe place, away from all personnel, while you are servicing the machine.

Always keep your tool case away from walk areas so that other persons will not trip over it; for example, put it under a desk or table.

Do not wear loose clothing that can be trapped in the moving parts of a machine. Ensure that your sleeves are fastened or are rolled up above the elbows. If your hair is long, fasten it.

Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.

Remember: A metal object lets more current flow if you touch a live conductor.

Insert the ends of your necktie or scarf inside other clothing or fasten the necktie with a clip, preferably nonconductive, approximately 8 cm (3 in) from the ends.

Safety with Electricity

Observe these additional rules when working on equip-

ment powered by electricity:

Find the room emergency power-off (EPO) switch or disconnecting switch. If an electrical accident occurs, you can then operate the switch quickly.

Do not work alone under hazardous conditions or near equipment that has hazardous voltages. Always inform your manager of any possible problem or if you must work alone.

Safety

iii

l Disconnect all power:

Before removing or installing main units

Before working near power supplies

Before doing a mechanical inspection of power supplies

Before installing changes in machine circuits.

Before you start to work on the machine, unplug the machine’s power cable, If you cannot unplug the cable easily, ask the customer to switch off the wall box switch that supplies power to the machine, and either:

Lock the wall box switch in the off position, or

Attach a DO NOT OPERATE tag,

Z229-0237,

to the wall box switch.

Note: A non-IBM attachment to an IBM machine can be powered possibly from another source and controlled by a different disconnecting switch or circuit breaker. If you determine that this condition is present, ensure that you remove (eliminate) this hazard before you start work.

. If you need to work on a machine that has exposed

electrical circuits, observe the following precautions:

Ensure that another person, who is familiar with the power-off controls, is near you.

Remember: Another person must be there to switch off the power, if necessary.

CAUTION:

Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical circuits.

Use only those tools and testers that are suitable for the job you are doing.

Use only one hand when working with powered-on electrical equipment; keep the other hand in your pocket or behind your back.

Remember: There must be a complete circuit to cause electrical shock. By observing the above rule, you may prevent a current from passing through the vital parts of your body.

When using testers, set the controls correctly and use the IBM-approved probe leads and accessories intended for that

tester.

CAUTION:

Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this wrong type of mat to protect yourself from electric shock.

Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as metal floor strips and machine frames.

Observe the special safety precautions when you work with very high voltages; these instructions are given in IBM safety service memorandums

(SMs) and the safety sections of maintenance

information. Use extreme care when measuring high voltages.

Do not use worn or broken tools and testers. Ensure that electrical hand tools, such as power

drills and

Wire-Wrap1

tools, are inspected regu-

larly. Never assume that power has been disconnected

from a circuit. First, check that it has been switched off.

Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors, nongrounded power extension cables, power surges, and missing safety grounds.

Do not touch live electrical circuits with the glass surface of a plastic dental mirror. The surface is conductive; such touching can cause personal injury and machine damage.

Unless the maintenance information specifically lets you, do not service the following parts with

power on them when they are removed from their

normal operating places in a machine:

Power supply units Pumps Blowers and fans Motor generators

and similar units. (This rule ensures correct grounding of the units.)

If an electrical accident occurs:

Use caution; do not become a victim yourself.

Switch off power.

!L_/

Trademark of the Gardner-Denver Co.

“L./j

Send another person to get medical aid.

If the victim is not breathing, decide whether to give rescue breathing.

These actions are described below.

Emergency First Aid

When giving rescue breathing after an electrical

accident:

Use Caution. If the victim is still in contact with the electrical-current source, remove the power; to do this, you may need to use the room emergency power-off (EPO)switch or disconnecting switch.

If you cannot find the switch, use a dry wooden rod or some other nonconductive object to pull or push the victim away from contact with the electrical-current source.

l Work Quickly. If the victim is unconscious, he or

she possibly needs rescue breathing. If the heart has stopped beating, the victim may also need external cardiac compression,

Only a trained and certified person2 should perform external cardiac compressions.

l Get Medical Aid. Call a rescue group, an ambu-

lance, or a hospital immediately.

2. Look, listen, and feel to determine if the victim is breathing freely:

a. Put your cheek near the victim’s mouth and

nose.

b. Listen and feel for the breathing-out of air. At

the same time, look at the victim’s chest and upper abdomen to see if they move up and down.

If the victim is not breathing correctly and you decide that you want to give rescue breathing:

Continue to press on the victim’s forehead with

your hand and pinch together the victim’s nostrils

with the thumb and finger.

Rescue Breathing Procedures

Determine if the victim needs rescue breathing:

1. Prepare the victim:

a. Ensure that the victim’s airway is open and

not obstructed. Check the mouth for objects (such as chewing gum, food, dentures, or the tongue) that can obstruct the flow of air.

b. Place the victim on his or her back, then put

one hand under the victim’s neck and the other hand on the victim’s forehead.

c. Lift the neck with one hand

forehead backward with the other hand.

If you want to be trained in giving this aid, ask a suitable organization (such as the Red Cross) in your area.

A rescue-breathing face covering (mask) or similar unit can be used if you have been taught how to use it.

and press the

4. CAUTION:

Use extreme care when giving rescue breathing to a victim who possibly has breathed-in toxic fumes. Do not breathe-in air

that the victim has breathed-out.

Open your mouth wide and take a deep breath. Make a tight seal with your mouth3 around the

victim’s

mouthm

and blow into it.

Safety

5. Remove your mouth and let the victim breathe out while you check that the victim’s chest

down.

moves

Reporting Accidents

Report to your manager or to your IBM site all accidents, possible hazards, and accidents that nearly occurred.

Remember:

caused by a design problem. Quick reporting ensures quick solving of the problem.

Report also each small electric shock, because the conditions that caused it need only differ slightly to cause serious injury.

An accident that nearly occurred can be

6. Repeat steps 4 and 5 once every 5 seconds until the victim breathes normally again or until medical aid comes.

L-..J

Contents

Chapter 1. General Information How to Use This Manual Safety Inspection Guide IBM Personal Computer,

l-1

l-l Power Diagnostic Tips

5150/5160-Based

l-l

Systems l-l Diskette Description l-2 Media/Drive Compatibility Table

l-3

Diskette Care l-4 Handling Static-Sensitive Devices

Chapter 2. 4860

PCjr

2-l

l-4

System Board 2-2 Power Supply Cordless Keyboard General Information 4860 PCjr Diagnostics General Diagnostic Tips Power Diagnostic Tips

Chapter 3. 5140 PC Convertible

2-2

2-3

2-4

2-7

3-l System Information 3-l Power Sources 3-l Options

Chapter 4. 5150 PC 5150/5160-Based General Diagnostic Tips

Power Diagnostic Tips

System/Memory Diagnostic Tips Diskette Drive/Fixed Disk Drive Diagnostic Tips Communications Diagnostic Tips 5150/5160-Based 5150 PC Switch Settings

3-2

4-1

System Diagnostics

4-3

4-4

4-13

System Diagnostic Information

4-14

4-9

4-14

Chapter 5. 5155Portable 5-l 5155 PC PortableDiagnostic Information

5-2

5155 PC PortableSwitch Settings 5-2 Chapter 6. 5160 PC XT

5160 PC XT Switch Settings Memory Option Switch Settings 5160

DunsPlus

5160 XT/370

System

6-17

Chapter 7. 5161 Expansion Unit

6-l

6-3

6-5

6-14

7-l

Chapter 8. 5162 PC XT Model 286 8-l 5162 PC XT/286 Diagnostic/Switch Setting

Information Error Codes 5162 PC XT/286 Diagnostics Memory Switch Settings 5162 PC XT/286 Switch Setting Information

8-6

8-7

Chapter 9. 5170 Personal Computer AT 9-l

System Differences

Hardware Considerations System Board

9-l

9-3

General Information 9-5 General Diagnostic Tips

9-6

9-8

System/Memory Diagnostic Tips

9-9

Diskette Drive/Fixed Disk Drive Diagnostic

Tips 5170 PC AT Switch Settings 5170 AT/370 Personal Computer AT Store Controller

Chapter System Units 3270 PC 3270 Personal Computer AT

9-14

9-26

10,

3270 PC Products

10-l

9-23

9-28

10-l

10-2

Diagnostic Tips and Information on the 3270 PC and

the 3270 PC AT 3270 PC/G 3270

PC/GX

10-3

10-4

10-6

5279 Color Display and 5278 Display Attachment

Unit

10-8

5379 Displays and 5378 Display Attachment

Units 5277 Mouse and 5083 Tablet Model 002 3270 Unique Error Codes

10-9

10-10

10-11

Diagnostic Tips and Information on PC/G, PC/GX,

AT/G, and AT/GX Memory Option Switches

10-12

10-13

3270 Personal Computer G and GX (AT-Based Only)

Extended Memory Adapter Chapter 11. Tempest Products

Tempest System (PC AT-Based) Debug Guide for 5Mb and

10-14

11-l

11-8

1OMb

Removable Hard Files Used with IBM Systems 4455, 4456, 4459, and 4460

Chapter 12. Industrial Products 5531 XTC Industrial Computer 5532 Color Display 7531 Industrial Computer 7532 Industrial Computer Options 7534 Industrial Enhanced Color Display 7544 Industrial Enhanced Color Display 7552 Industrial Computer

11-12

12-1

12-l

12-3

12-3 12-3

12-4

12-8 12-9

12-9

7494 Entry Level Facility (ELF) Data Collection

Terminal

Chapter 13. 5126 Technician Terminal

-5126

System

Chapter 14. Personal Computer/Series 1

4950

System

12-11

13-1

14-1

Series/l to Personal Computer Channel

Attachment

5170/495

System

Chapter 15. Display Units

14-4

14-6

15-l

Contents vii

4863 PCjr Color Display 5151 Monochrome Display 5153 Color Display 5154 Enhanced Color Display 5175 Professional Graphics Display

5272 Color Display

4055 InfoWindow Display

IBM PC Cards and IBM PC to IBM 4055 InfoWindow

Interface Cables

Displays Diagnostic Tips

15-1

15-2

15-3

15-4

15-8

15-9

Chapter 17. PC Family Options and

Adapters

System to Adapter Compatibility Options Parameters (5150, 5160, 5161) Option to Adapter Compatibility 4860 PCjr Options PC Family Options

Chapter 18. Personal Computer Parts

Catalog

17-l

17-5

17-6

17-11

18-1

17-4

Chapter 16. Additional I/O

3363 Optical Disk Drive 5173 IBM PC Network Baseband Extender 5178 Translator Unit IBM 5841 1200 bps Modem 6157 Streaming Tape Drive 6180 Color Plotter 7371 Color Plotter 7372 Color Plotter 8228 Multistation Access Unit for IBM Token-Ring

Network

16-9

16-4

16-7

16-8

16-1

16-2

16-5

16-6

Chapter 19. Engineering Change Announcements

(ECAs) 19-1

Chapter 20. Advanced Diagnostic Diskettes Making a Backup Copy

Chapter 21. Service Summary Cards

Part Number Index X-l

Index x-3

20-l

21-I

20-l

. . .

Vlll

Chapter 1 m General Information

How to Use This Manual

The purpose of this Service is to provide its users with the most frequently used Personal Computer service-related maintenance and reference information.

The SIM is not required to service the Personal Computer family of products. This SIM has been made available as a convenience to the servicer. This manual is not designed to provide total product support; its purpose is to supplement the Hardware Maintenance Library (HMS/HMR).

Also included with this manual are two advanced diagnostic diskettes and Service Summary Cards for use with the 5150, 5155, 5160, 5162, and 5170.

The advanced diagnostics should be used to:

l Test each area of the system

l Isolate problems to specific areas of the system

through the use of error codes

l Verify correct installation and operation of the

system.

Information about many Personal Computer options is available in this manual. However, if additional option information is required, refer to the Hardware Maintenance Service (HMS) manual for your machine.

Note: K is used interchangeably with Kb to mean

1024 bytes.

Information Manual

(SIM)

Safety Inspection Guide

The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on products included in this manual. Each machine, as it is designed and built, has required safety items installed to protect the users and service personnel from injury. This guide addresses only those items. However, good judgment should be used to identify potentially unsafe conditions not covered by this inspection guide.

If any unsafe conditions are present, a determination must be made on how serious the apparent hazard could be and whether you can continue without first correcting the problem.

Consider these conditions and the safety hazards they present:

Electrical hazards, especially primary power; primary voltage on the frame can cause serious or fatal electrical shock. Explosive hazards; a damaged CRT face or bulging capacitor can cause serious injury.

Mechanical hazards; loose or missing hardware can cause serious injury.

IBM Personal Computer,

5150/51

To inspect the IBM Personal Computer:

Set the power switch to off and disconnect the

1. power cord from the electrical outlet. Check the exterior covers for damage (loose,

2. broken, or sharp edges). Check the power cord for the following:

Remove the cover-mounting screws from the rear

4. panel, and remove the cover. Check for any obvious non-IBM alterations. Use

5. good judgment as to the safety of any non-IBM alterations. Check inside the unit for any obvious unsafe con-

6. ditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage. Check for worn, frayed, or pinched cables. Ensure that the voltage specified on the voltage tag (back panel of the machine) matches the voltage of the power receptacle. If in doubt, the voltage should be verified. Examine the power supply and verify the following:

a. Ensure that the non-removable fasteners in

b. Ensure that the grommet is installed where

Check for the following labels:

10.

a. Caution. Hazardous Area. Do not remove this

60-Based Systems

A third-wire ground connector in good condition. Use a meter to measure third-wire ground continuity for 0.1 ohms or less between the external ground pin and the frame ground as specified in the Hardware Maintenance

Library.

The cord set should be the appropriate molded type as specified in the Hardware

Library,

Insulation must not be frayed or worn.

’

the power-supply cover have not been removed or tampered with.

the internal power cables come through the frame of the power supply.

cover. Trained service people only. No serviceable components inside.

Maintenance

Chapter 1. General Information

l-l

IBM Personal Computer AT@

5170-Based

To inspect the IBM Personal Computer AT:

Set the power switch to off and disconnect the power cord. Check exterior covers for damage (loose, broken,

2. or sharp edges). Check the power cord for the following:

a. A third-wire ground connector in good condi-

tion. Use a meter to measure third-wire ground continuity for 0.1 ohms or less between the external ground pin and the frame ground as specified in the Hardware

Library.

b. Insulation must not be frayed or worn.

Remove the back panel from the system unit.

4. Remove the five cover-mounting screws from the

5. rear panel, and remove the cover. Check for any obvious non-IBM alterations. Use

6. good judgment as to the safety of any non-IBM alterations. Check inside the unit for any obvious unsafe con-

7. ditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage. Check for worn, frayed, or pinched cables.

8. Ensure that the voltage specified on the voltage

9. tag (back panel of the machine) matches the voltage of the power receptacle. If in doubt, the voltage should be verified. Examine the power supply and verify the fol-

10. lowing:

a. On universal power supplies, ensure that the

input voltage selection switch is set correctly.

b. Ensure that tamper-resistant fasteners in the

power supply cover have not been removed or tampered with.

c. Ensure that the grommet is installed where

the internal power cables come through the frame of the power supply.

Check for the following labels:

11.

“Battery warning: Do not dispose of battery

unit in fire or water. See instruction for disposal in the battery installation instructions.”

b. Caution. Hazardous Area. Do not remove this

cover. Trained service people only. No serviceable components inside.

Check the condition of the battery.

12.

Systems

Maintenance

Diskette Description

The recording medium is a flexible, magnetic disk enclosed in a protective jacket. The protected disk, free to rotate within the jacket, is continuously cleaned by the soft fabric lining of the jacket during normal operation. Read/write/erase head access is made through an opening in the jacket. Openings for the drive hub and diskette index hole are also provided. The following figure is a drawing of the diskette used with the IBM 5.25Inch Diskette Drive.

Oxide Coated

3.56 mm

CO.lpO in.)+--

Recording Medium

Figure l-l.

5.25-Inch

Diskette, Simplified

Mylar

lTrademark of E. I. du Pont de Nemours and Co., Inc.

Types of 5.25-Inch Diskettes

You can use the following types of diskettes to read

and write information:

l Single-sided l Double-sided l High-capacity

(160Kb/180Kb)

(320Kb/360Kb)

(1.2Mb).

It is important to remember that if you write on a single-sided or double-sided diskette using a capacity diskette drive, you might not be able to read the diskettes in a single- or double-sided diskette drive.

Disk

Aperture

Write

Protect Notch

LEX41771

high-

1-2

‘-i

Types of 3.5-Inch Diskettes

Distinguishing

features

Locking

(In closed position, allows writing on diskette)

Note: Format 1 .OMb media to 720Kb Format 2.OMb media to

Figure 1-2. 3.5Inch Diskette Types The

3.5-inch disk attached to the bottom of the circular magnetic recording surface. This assembly is permanently

encased in a hard plastic shell. The

3.5inch diskettes can be differentiated by examining the top surface of the plastic case. The 2Mb 3.5inch diskette has the letters HD in the top upper right corner of the plastic case and a square opening on the top lower right corner. The have no such marking.

The slim, compact size of the 3.5inch diskette and the permanent hard plastic shell in which it is encased provide easy transportability. A metal shutter at the front of the diskette covers and protects the magnetic recording surface when the diskette is not in use.

When the diskette is properly inserted into the system, metal shutter end first, the shutter is opened automatically to allow read or write activities. A write protect sensor on the bottom of the plastic case can be positioned to protect the data stored on the diskette, When the square opening on the top lower left corner of the diskette is open (you can see through the hole), the diskette is write protected and cannot be written.

The write protect interlock is located on the bottom right corner of the plastic shell.

It is important to note that some taining valuable programs, such as system diagnostics,

720Kb diskette

tab-

1.44Mb

diskette consists of a metal positive drive

Locking tab (In closed position, allows writing on diskette)

1Mb

3.5inch diskettes

3.5-inch

1.44Mb

1Mb

and 2Mb

diskettes con-

diskette

LEX42345

will not have this selectable write protect interlock in order to prevent accidental overwriting.

Note:720Kb diskette drives can use only the diskettes.

1Mb

Media/Drive Compatibility

Table

The following table identifies the minimum supported level of DOS required to read, write, or format the applicable media in the installed diskette drives.

DOS levels are downward compatible with respect to diskette formatting; therefore, prior formats are supported.

Operation

diskette formatted to:

5.25-inch 160Kb

180Kb

320Kb Read,

360Kb

1.2Mb

3.5-inch diskette formatted to: 720Kb

Figure 1-3. Media/Drive Compatibility Table

To use this chart, find your diskette drive and IBM Personal Computer across the top of the table. Then, coming down the left column, find your media. The intersection of the read, write, format row and your diskette drive and IBM Personal Computer column identifies the minimum DOS level required to support

the function. Where N/A appears, it indicates either unreliable operation will occur or the product cannot perform the function.

Read, Write, DOS 1.00 NO Format

Read, Write, DOS 2.00 NO

Format

Write, Format

Read, Write, Format

5.25-Inch 5.25-Inch 3.5-Inch

Drives Drives Drives

PCjrTM

XTTM

Portable

4869

DOS DOS 1.00 No

DOS

DOS2.00 No

DOS 1.10 DOS 1.10 No

DOS 1.10 No

1.00

2.00

286 4865

DOS

DOS 3.00

Convertible External

Internal B

3.00

N/A

DOS 3.20

N/A N/A

DOS 3.20 DOS 3.20

Chapter 1. General Information

1-3

Diskette Care

The figure below shows proper and improper ways of handling your diskettes. Proper handling will greatly reduce the possibility of damaging them.

Proper

Improper

Don’t

Touch

Disk

Wear the ESD wrist band any time ESD sensitive devices are handled. This will place your body, the option, and the system unit at the same ground

potential, thus preventing an accidental static dis-

charge.

LEX40289

Figure 1-6. Anti-Static Bag Removal

2. Carefully remove the option from its anti-static bag. Be sure to grasp circuit boards by the edges only; do not touch the component pins or solder joints. Grasp diskette drives by their frames to avoid touching the electronics board. Grasp chips by their narrow ends only, not by their pins.

LEX40287

Figure 1-4. Diskette Handling Procedures

Handling Static-Sensitive Devices

Some of the components that make up the options for your IBM Personal Computer can be damaged by electrostatic discharges. To prevent this damage, the options are wrapped in a conductive, anti-static bag; certain precautions must be taken before removing an option from its bag:

LEX40290

Figure 1-7. Option Insertion

3. When inserting an option adapter into the system board, hold the adapter by its top edge or upper corners.

Figure l-5. Option Static Charge

1-4

LEX40288

Chapter 2. 4860

PCjr

LEX40065

Figure 2-l. 4860 PCjr

The 4860 is a low-cost, compact, desktop microcomputer. It is available in two models, the 04 and 67. It utilizes an 8088 Microprocessor, 64Kb of random access memory (RAM), and two cartridge slots. Features include a 360Kb sion up to 512Kb.

Infrared Receiver

Base

disk

drive and memory expan-

Top Cover

Diskette Drive

Modem

Light Pen

Figure 2-3. 4860 PCjr (Rear view)

’

Television

Unit Specifications

Size

Height Length Depth

Weight

With Diskette Drive

W/o Diskette Drive

97 mm (3.8 in) 354 290 mm (11.4 in)

3.71

2.61 kg (5 lb 8 oz)

On/Off Switch

(13.9 in)

kg (8 lb 4 oz)

External

Cassette

Serial

’

Direct

Drive

Video

Composite

Video

LEX40067

Power

(Optional)

Figure 2-2. 4860 PCjr (Front view)

Cordless Keyboard

LEX40066

Environment

Air Temperature

System

System Off

Humidity

System On System Off

Heat Output

Noise Level

Electrical

Nominal Minimum Maximum

kva

Figure 2-4. 4860 System Unit Specifications

15.6” to

(60” to 90°F)

10” to 43°C

(50”

8% to 80% 8%

283

120V AC 104V

127VAC

0.082 max.

Chapter 2. 4860 PCjr

32.2”C

to 110°F)

tci

80%

BTU/hr max.

dBa

2-1

Interface Locations

Interface.

Compact printer Diskette drive Display

~~~

Graphics printer Internal modem Joystick Keyboard Light pen Memory

RS232C Sound

Figure 2-5. 4860 Interface Locations

Location

Compact printer Diskette-drive adapter System board and 64Kb memory

and display expansion Parallel printer attachment Internal modem System board System board System board System board and 64Kb memory

and display expansion System board System board

The system board contains the following major functional components:

8088 Microprocessor

64Kb read-only memory (ROM)

128Kb ROM cartridge interface

64Kb dynamic RAM

64Kb memory and display expansion interface

Serial port (RS232)

Audio alarm (beeper)

Sound subsystem

Cassette interface

Joystick interface

Keyboard interface

Modem interface

Diskette interface

Video/graphics subsystem

Light pen interface

I/O expansion bus

9-level interrupt.

System

Internal Modem Connector

Infrared Receiver \

Diskette Drive

Adapter Connector

Figure 2-6. 4860 System Board

Board

64Kb Memory

Expansion Connector

Power Board Connector

Left Side

LEX40068

Power Supply

Supply to Diskette Drive

;iii;i;re$jg

Grounding Pin Connector

Figure 2-7. 4860 Power Board (Component Side) The system power supply is a 33-watt, three-voltage-

level, two-stage supply. The first stage is an external power transformer that provides a single protected, extra-low, AC-voltage output. The second stage is an internal, printed circuit board, which is vertically mounted into the system board. The second stage converts the transformer’s AC output into three DC output levels.

Power is supplied to the system board through a printed circuit board edge connector. The diskette drive is powered through a separate

mounted on the front edge of the power board. The

power for the diskette drive fan is provided by a 3-pin,

Berg-type connector mounted directly below the diskette drive connector. Power is removed from the system board and diskette drive by a switch mounted on the rear of the power board. Both the switch and

the

transformer connector are accessible

of the system.

A10 Al

4-pin

Fan Plug

LEX40069

fuse-

connector

from

the

rear

2-2

Cordless Keyboard

LEX41744

Figure 2-8. 4860 Cordless Keyboard The keyboard is a low-profile, 62-key,

board with full-travel keys. The keys are arranged in a standard typewriter layout with the addition of a function key and cursor-control keys.

The keyboard is battery powered and communicates to the system unit with an infrared (IR) link. The IR link makes the remote keyboard a truly portable hand-held device. An optional cord connection to the system unit is available. Power is sent to the keyboard and serially encoded data is received by the system unit through the optional cord. When connected, the cord’s keyboard connector removes the battery power, and the -CABLE CONNECT signal disables the infrared receiver circuit. The disabling of the circuit also allows other infrared devices to be used without interfering with the system. The data, which is received through the IR link or by the cord, have the same format.

The keyboard electronics are designed with low-power, complementary metal-oxide semiconductor (CMOS) integrated circuitry for battery power operations. Four AA-size batteries are required. Because the key-

board is normally in the standby power-down mode,

which uses very little power, no on/off switch is

needed.

detached

key-

General Information

Connector Guides

PCjr connector guides help eliminate the possibility of connector pins being broken on the 4860 PCjr Planar Board. The connector guides snap into the back cover of the system unit. The installation of these guides requires no tools; however, the system unit and attached devices must be powered off, as the cables need to be removed to facilitate installation of the guides. P/N6447163 provides guides along with instructions necessary for installation. The part is a no-cost item and can be ordered through normal parts distribution. If system unit diagnostics require the use of service plugs, the connector guides must be carefully removed and reinstalled at the completion of the repair activity.

PCjr

Diskette Drive. Inserts

There is no specified part number for a shipping insert for the PCjr diskette drive. Use the generic insert P/N6447190 available from distribution. Trim off approximately 0.5 inch, or remove the back tab of the generic insert. This will allow clearance for the latch lever to swing into the lock position without interference.

4860 PCjr

Error Codes

You might have an error code or an audio response

during the power-on self test (POST). If you have both an error code and an audio error, disregard the audio error and perform advanced diagnostics on the FRU

indicated.

Diagnostics

The 4860 Keyboard was manufactured in two versions. The old Chicklet version was replaced with the version that is currently in use. The new keyboard is electron-

ically identical to the older version but is improved mechanically for easier use. It has bigger keys that are easier to press, and the key designations are on the key tops rather than printed on the keyboard itself.

The 4860 Keyboard is a field replaceable unit (FRU); nothing on it can be repaired. Batteries in the keyboard are the customer’s responsibility. A failing keyboard should be replaced.

Chapter 2. 4860 PCjr

2-3

POST

Error

No beep. No

image or image on screen wrong.

One beep. No image or image on screen wrong.

Two beeps. No image or image on screen wrong.

Three beeps. No image or image on screen wrong.

Advanced POST or portion of it goes into loop.

No beep.

ERROR OAXX No beep.

ERROR OBXX

No beep. ERROR OCXX

No beep. ERROR 1YXX

No beep. ERROR 2000

No beep. ERROR 21XX

No beep. ERROR 22XX

No beep. ERROR 23XX

No beep. ERROR 24XX

No beep. ERROR 25XX

No beep. ERROR 26XX

No beep. ERROR 27XX

No beep. ERROR 28XX

Any ERROR message not listed in this table.

Problem Area

Power

Display

Power

Memory

System Board

Memory

Keyboard

Infrared

Keyboard Keyboard

Cassette

or Serial Modem

Cartridge

Diskette

Drive Adapter Cluster

Speech

Service Plug

Probable Cause

System Board or Power Board

System Board or 64Kb Memory and Display Expansion

System Board or Power Board

64Kb Memory and Display Expansion

System Board

64Kb Memory and Display Expansion

64Kb Memory and

Display Expansion

System Board

Keyboard

Infrared Receiver

System Board

Internal Modem

Diskette Drive

Cluster Adapter

Speech Adapter

Ensure that Service Plug is good and installed correctly. Repeat advanced POST.

If same message,

replace Board.

System

General Diagnostic Tips

Required Items for Diagnostics

In order to perform all of the advanced diagnostics, you must have:

l A system unit

. A known good display television receiver

l A service plug, P/N6447196 l A POST-loop plug, P/N6447197 l A parallel printer attachment wrap plug,

P/N8529228

l A serial wrap plug, P/N6447198 l A Triplet Model 310 Multimeter (or equivalent).

How to Perform Advanced POST

Before you perform advanced POST, do the following:

Set the system unit’s power switch to off.

1. Set the display’s power switch to off.

2. Connect the power transformer’s power cord to a

3. functioning, properly grounded outlet. Install all connectors securely in their proper

4. locations. Remove any cartridge, cassette, or diskette from

5. the system unit and attached devices. If the cordless keyboard is being used without its

6. optional keyboard cord:

l Position the keyboard within 12 inches of the

front of the system unit.

Remove any obstructions between the infrared (IR) emitter in the back of the keyboard and the IR receiver on the system unit.

Plug the service plug into the system unit J con-

7. nectors. Turn the display’s brightness, contrast, and

8. volume controls to midrange. Set the display’s power switch to on.

9. Set the system unit’s power switch to on.

10. Advanced POST begins as soon as the system unit

power switch is set to on. It takes as long as 1 minute to complete. While advanced POST is running:

l You see a stable IBM logo and 16-color test

pattern on your screen.

Figure 2-9. 4360

2-4

PCjr

Advanced POST Error Table

LEX40136

-)I$-

+;$

‘-

-;L$-

I’

Figure If advanced POST detects a failure, you will receive an

incorrect audio response (no beep, two beeps, or three beeps), an incorrect screen, an error message, or any combination of these. In these cases, see Figure 2-9 on page 2-4 for the recommended action.

After you have followed the above steps once, all you have to do when asked to perform advanced POST is:

2-10,

Screen Test Pattern

1. Set the system unit’s power switch to off. 2, Wait

seconds.

How to Perform Advanced Tests

Advanced tests are the tests you choose from the advanced-test menu. The advanced-test menu is stored in the system unit’s read-only memo ry (ROM).

When you are asked to bring up the advanced-test menu, follow these steps:

1. Set the system unit’s power switch to on.

2. Wait until advanced POST completes and the BASIC screen appears.

3. Press and hold the Ctrl and Alt keys, and then press the Ins key.

4. Release all keys when the screen goes blank.

The IBM logo appears, the diskette drive (if attached) red light switches on for a moment, and you hear one beep. Then the advanced-test menu appears.

LEX40137

Figure

The advanced-test menu consists of symbols, with each symbol representing one area of the IBM PCjr. The

letters or numbers below the symbols are

you can perform, A quick way to determine if you are

looking at the advanced-test menu or the customerlevel-test menu (they look similar) is to observe the ID

under the joystick symbol. The advanced-test level has

2-11.

Advanced-Test Menu

E there. The customer-level has a 6.

Diskette- Drive Test

Type MPNP

* .

Display and Light Pen Test

Joystick Test

Sound Test

Graphics Printer Test

Internal Modem Test

Compact Printer Test’

IDs

of tests

RS232

p=@q

Figure Z-12. Advanced Test Symbols

Serial Port Test

Keybdard Test

Cluster Test

Chapter 2.

LEX40138

4860 PCjr

2-5

Some symbols and menu only when their particular options are attached to the system unit.

If you see an advanced-test menu, the menu has another page of symbols. When the cursor is moved to the last ID on the screen, moving it again causes this next menu page to appear.

On the last menu page, an corner. When the cursor is moved to the last ID on this screen, moving it again causes the first menu page to reappear.

IDs

appear on the advanced-test

in the lower right-hand corner of the

is in the lower right-hand

RS232

-; i’

The

IDs

for joystick and sound always blink because their interfaces are on the system board, The blinking does not mean a joystick or external speaker is installed.

The diskette drive interface is on the diskette drive adapter. The ID under the diskette drive symbol therefore blinks only when the diskette drive adapter is installed.

The

IDs

4 and 5 under the display symbol blink all the

time. ID 8 blinks when the 64Kb memory and display expansion is present.

While the advanced-test menu is on your screen, a memory test is running continuously. The number incrementing at the bottom of the screen shows what segment of memory is being tested. If a memory failure is detected, the number stops incrementing and the

next to it is replaced by an error message. If this

failure occurs, make a note of the error message and

go to PIC “Memory.”

LEX40139

Figure

2-13.

When the IBM PCjr senses the presence of a device interface, the ID under the symbol for that device blinks. The device interface is the electronic circuitry necessary for the system unit to control a particular device. In Figure drive, display, joystick, and sound are sensed.

Last Menu Page

2-14, the interfaces for diskette

.’ I’,

-,+,

‘;(i-

64 KB

’

LEX40140

-;$-

Figure

2-15.

You move the cursor to the test’s ID by pressing the Ins key. When you are ready to start the test, press the Enter key and the test begins.

The test is finished when a message appears under the symbol’s ID. If

64 KB ’ XX YY XX

Memory Segment Testing

appears, no failure was detected.

LEX40141

Figure 2-14. Interface Device Sensory

2-6

Customer Error Codes

-$I:-

.‘I’,

-,$, y-i-

64 KB ’ XX YY XX

Figure 2-16. Test Completion

If something other than detected.

If you want to stop a test that is running, press the FN key, and then press the B key. Depending on which test is running, you can get one of several responses after pressing FN-B. The following table lists the responses.

Test Running Response to Pressing FN-B

Diskette drive Graphics printer

Compact printer Internal modem Sound

Display RS232

Keyboard

Joystick Light pen is

Figure The “FFFF” message lets you know that the test was

stopped before completion.

2-17.

Response Messages

appears, a failure was

(If the system unit beeps, press FN-B again.) Test may not stop immediately. Message is “FFFF.”

Test stops immediately. Message is “FFFF.”

The FN and B keys must be shown on the screen before using them to abort the test. Test stops immediately. Message is

Test stops immediately. Message

LEX40142

When requesting service, customers may reference an

error code found in the Error Message Table on page 6-17 of the Guide

are not advanced diagnostic error codes and cannot be found in the Hardware and Maintenance Service (HMS) manual. A list of the codes follow:

Error

A D

X B

These errors are for reference only. Actual failures should be determined by using the advanced diagnostics.

Operations

Action

Have system serviced.

Keyboard problem; move away fram bright light.

Cassette problem; if the cassette is not in use, press Enter and continue.

Modem problem; if modem is not required, press Enter to continue.

(GTO)

manual. These

Power Diagnostic Tips

Diskette Drive Voltage at the Power Board

The voltages at the diskette drive power cable connector on the power board should be within the ranges listed below.

Low V DC

Pin1toPin

4toPin

Figure 2-18. Diskette Drive Power Board Voltage

+ 11.4

i-4.7

Levels

High V DC

12.6

5.3

When you want to remove the advanced-test menu from your screen, press and hold and then press the Del key,

the Ctrl and Alt keys,

Chapter 2.

4860 PCjr

2-7

LEX40143

Figure 2-19. Diskette Drive Pin Placement

Diskette Drive Fan Voltage at

the Power Board

Figure 2-23. Display Board Pin Placement

LEX40145

The voltages at the diskette drive fan connector on the power board should be’ within the ranges listed below.

Pin2to Pin2to

Figure 2-20. Fan Power Board Voltage Levels

Figure 2-21. Fan Power Board Pin Placement

3 +11.4 +12.6

1 LowV DC

11.4 +12.6

HighV DC

LEX40144

Display Voltage at the System

Board

The voltages at connector D should be within the ranges listed below.

Continuity of Color Display Adapter Cable

S-pin Connector from Position

1 2 3

Not used

Figure 2-24. Color Display Adapter Cable Con-

nections

2 x S-pin Connector to Position

B9 B5 A5

Al A4 A6

B3 B1

l-l

Figure 2-22. Display Board Voltage Levels

2-8

LEX40146

Figure 2-25. Color Display Connector Locations

Continuity of Serial Device Adapter Cable

25-pin Connector from Position

2 3 4 5 6 7

Figure 2-26. Serial Device Adapter Cable Continuity

2 x S-pin Connector to Position

A4 AS A3 A7 A6 B2 A5 A2

LEX40147

3 2 1

Figure 2-29. Keyboard Cable Pin Placements

LEX40148

Figure 2-27. Serial Device Adapter Cable Pin Place-

ment

Continuity of Keyboard Cable

;

Figure 2-28. Keyboard Cable Continuity Connections

Chapter 2. 4860 PCjr

2-9

Chapter 3. 5140 PC Convertible

Unit Specifications

LEX41040

Figure

3-l.

5140 PC Convertible

System Information

The IBM 5140 PC Convertible is a portable personal

computer designed for professional applications and personal productivity. It is designed to enhance personal computing capability with multiple power options. The uniqueness of the system unit is the integration of microprocessor, display diskette drives, keyboard, memory, battery power supply, and optional modem within a full function system that can be

carried in one hand and used in most environments. The IBM drive systems through asynchronous communications and 3.5inch drive options (IBM 4865) on existing PCs.

5140 maintains compatibility with 5.25inch

Size

Height

Length

Width

Weight

Environment

Air Temperature

System On System Off

Humidity

System On System Off

Electrical

Figure 3-2. 5140 Specifications

68.0 mm (2.68 in)

374.0 mm (14.72 in)

312.0 mm (12.28 in)

5.5 kg (12.17 lb)

10” to 40°C (50” to 105°F)

0.6” to

51.7”C

(33 to 125°F)

5 to 95% 5 to 95%

{AC adapter input range}

90.265V, 50/60

Hz AC

Power Sources

Several sources for power are available for the 5140 PC

Convertible. They are:

IBM PC Convertible AC Adapter

The AC Adapter is designed to be used by the system while simultaneously charging the internal battery. The AC Adapter supports tion.

11OV

AC or 220V AC opera-

The IBM PC Convertible features an processor and 256Kb of user memory. User memory can be expanded to memory cards installed by the user. The 3.5-inch diskette drive is a double-sided drive with 720Kb of (formatted) storage capacity.

The 80-column x display features a bonding process that reduces glare and increases visibility.

512Kb

with the addition of 128Kb

25-line

detachable liquid crystal

8OC88

Micro-

Battery Pack

The battery pack contains eight rechargeable NiCad cells packaged into a single unit. It resides inside the system unit and plugs onto the power supply card under the unit’s covers. When fully charged, the battery pack will provide approximately eight hours of operation. This time will vary depending upon the amount of usage of the higher consumption devices, such as diskette drives.

Chapter 3. 5140 PC Convertible

3-I

IBM PC Convertible Battery Charger

IBM PC Convertible Color

The battery charger is designed to be used to trickle chargethe internal batteries of provide tion while the batteries are being charged.

sufficient power output

the system. It does not

to allow system opera-

IBM PC Convertible Automobile Power Adapter

The Automobile Power Adapter is designed to power the system unit while simultaneously charging the system system in a vehicle system.

battery pack. unit and plugs

with a 12V

The adapter attaches to the

into the cigarette lighter outlet

negative-groundelectrical

Options

Monitor Adapter

Parallel

Printer Adapter

The IBM PC Convertible Color Display is a RGBI direct drive display with 320 x 200 lines graphics support and text modes of 40 x 25 and 80 x 25. The display includes a speaker for external audio output.

13-inch

IBM PC Convertible Cathode Ray Tube (CRT) Display Adapter

The IBM PC Convertible CRT Display Adapter attaches to the IBM PC Convertible and is operable when the system is powered with the AC Adapter. The IBM PC Convertible Monochrome Display, the IBM PC Convertible Color Display, the IBM Personal Computer Color Display, and the IBM PCjr Color Display are supported.

IBM PC Convertible Internal Modem

The IBM PC Convertible Internal Modem gives users the capability of communication between the IBM PC

Convertible and other compatible systems over existing telephone lines at speeds of either 300 or 1200 baud.

LEX41041

Figure 3-3. Option Configuration

IBM PC Convertible Printer

The IBM PC Convertible Printer is a matrix printer designed to attach to the back of the IBM PC Convertible and to draw its power from the system unit’s battery pack. An all-points-addressable (APA) mode is provided for graphics.

IBM PC Convertible

Monochrome Display

The IBM PC Convertible Monochrome Display is a 9-inch

composite video display with 80 x 25 and 40 x 25

text

modes and 640 x 200 and 320 x 200 graphics

support.

IBM PC Convertible

Serial/Parallel Adapter

The IBM PC Convertible Serial/Parallel Adapter provides an face and a parallel printer interface.

RS232C

asynchronous communications inter-

Supported Options

The IBM Personal Computer options that are supported on the IBM 5140 are:

l IBM 5152 Graphics Printer

IBM 4201 Proprinter

l IBM Personal Computer Printer Cable

. IBM 5153 PC Color Display

l IBM 4863 PCjr Color Display l IBM Communications Adapter Cable.

Diagnostic Tip

Error Code 5103

When running diagnostics on the 5140 PC and it responds with a 5103 error, make sure that there is paper in the printer, the ribbon is installed correctly, and the ribbon cassette is not out of ribbon, Any of these conditions can cause

a 5103 error.

Chapter 4. 5150 PC

‘;

Diskette Drive

Keyboard

’

LEX40671

Figure 4-l. 5150 PC

The 5150 PC uses a 16-bit 8088 Processor, 16Kb to

640Kb of RAM. It uses 0, 1, or 2 diskette drives with a storage range of 160Kb to 320Kb. The 5150 has five I/O slots and a 4-channel direct memory access (DMA) 40Kb ROM.

Unit Specifications

Electrical

Nominal Minimum Maximum kva

120V AC

104V

127V

0.22 max.

Figure 4-2 (Part 2 of 2). 5150 PC1 Specifications

System Board

Keyboard

System Expansion Slots ,

16-64K CPU or

Cassette

Math

/Coprocessor

System Board Power Connections

Color

Trimmer

Capacitor 8088

Processor

Switch

Block 2

Switch

Block 1

L__/’

System Unit Size

Height Length Depth

Weight

Power Cable

Length Size

Environment

Air Temperature

System On System Off

Humidity

System On

System Off Heat Output Noise Level

Figure 4-2 (Part 1 of 2). 5150 PC1 Specifications

142 mm (5.5 in) 500 mm (19.6 in) 410 mm (16.1 in)

11.4 kg (25 lb)

1.83 m (6 ft)

18 AWG

15.6” to

32.2”C

(60” to 90°F)

lo” to 43°C

(50” to

110°F)

8% to 80% 20% to 80%

365 BTU/hr max. 56 dBa

Modules

Pin 1 /

\Speaker\

Output or Auxiliary Select

Cassette Microphone

LEX40072

Figure 4-3. 5150 System Board The system board fits horizontally in the base of the

system unit. It is a multilayer, single-land-per-channel design with ground and internal planes provided. DC power and a signal from the power supply enter the board through two 6-pin connectors. Other connectors on the board are for attaching the keyboard, audio cassette, and speaker. Five 62-pin card edge sockets are also mounted on the board. The I/O channel is bussed across these five I/O slots.

Two dual in-line package (DIP) switches (two

eight-

switch packs) are mounted on the board and can be

read under program control. The DIP switches provide

the system software with information about the installed options, how much storage the system board has, what type of display adapter is installed, what operation modes are desired when power is switched on (color or black-and-white,

and the number of diskette drives attached.

80- or 40-character lines),

Chapter 4. 5150 PC

4-1

The system board consists of five functional areas: the microprocessor subsystem and its support elements, the read-only memory (ROM) subsystem, the read/write (R/W) memory subsystem, integrated I/O adapters, and the I/O channel. The read/write memory is also referred to as random access memory (RAM).

Microprocessor

12V

+ 5V DC, 2 A at +

at -12V DC. These outputs are overvoltage, overcurrent, open-circuit, and short-circuit protected. If a DC overload or overvoltage condition occurs, all DC outputs are shut down as long as the condition exists.

The +

12V

DC and receivers on the Asynchronous Communications Adapter.

DC, 0.3 A at - 5V DC, and 0.25 A

-12V

DC power the EIA drivers and

The heart of the system board is the Intel 8088 Microprocessor. This is an 8-bit external-bus version of Intel’s

16-bit

8086 Microprocessor and is software-

compatible with the 8086. Thus, the 8088 supports

16-bit

operations, including multiply and divide, and supports 20 bits of addressing. It also operates in maximum mode, so a co-microprocessor can be added as a feature. The microprocessor operates at 4.77 MHz.

Power Supply

5-l /4 Inch Diskette Drive Power C

Power On/Off

IBM Monochrome Display Power Connector (Internally Switched)

Figure 4-4. Power Supply The system power supply is located at the right rear of

the system unit. It is an integral part of the systemunit chassis. Its housing provides support for the rear panel, and its fan furnishes cooling for the whole system.

It supplies the power and reset signal necessary for the operation of the system board, installed options, and the keyboard. It also provides a switch AC socket for the IBM Monochrome Display and two separate connectors for power to the 5.25inch diskette drives.

The two different power supplies available are designed for continuous operation at 63.5 watts. They have a fused 120V AC or provide four regulated DC output voltages: 7 A at

System Unit Power Connector

220/240V

nnectors

System Board Power Connector

AC input and

LEX40073

The + 12V DC also powers the system’s dynamic memory and the two internal motors. It is assumed that only one drive is active at a time. The board and diskette drives and allows about 4 A of + 5V DC for the adapters in the system-unit expansion slots. The -5V DC is for dynamic memory bias voltage; it tracks the + 5V DC and + power on and has a longer delay on power off than the

5V DC voltages are bussed across each of the five systemunit expansion slots.

+5V

DC powers the logic on the system

DC and + 12V DC outputs. All four power supply

5.25-inch

12V

DC very quickly at

diskette drive

Keyboard

The IBM Personal Computer keyboard has a permanently attached cable that connects to a DIN connector at the rear of the system unit. This shielded 5-wire cable has power bidirectional signal lines, and one wire used as a reset line. The cable is approximately 182.88 cm (6 ft) long and coiled, like that of a telephone handset.

The keyboard uses a capacitive technology with a microprocessor (Intel 8048) performing the keyboard scan function. The keyboard has two tilt positions for operator comfort

The keyboard has 83 keys arranged in three major groupings. standard typewriter keyboard layout. On the left side are 10 function keys. These keys are defined by the software. On the right is a l5-key keypad. These keys are also defined by the software but have legends for the functions of numeric entry, cursor control, calculator pad, and screen edit.

The keyboard interface is defined so that system software has maximum flexibility in defining certain keyboard operations. This is accomplished by having the keyboard return scan codes rather than American Standard Code for Information Interchange (ASCII) codes. In addition, all keys are typematic (if held down, they will repeat) and generate both a make and a break scan code. For example, key 1 produces scan code hex 01 on make and code hex 81 on break. Break codes are formed by adding hex 80 to make codes. The keyboard I/O driver can define keyboard keys as shift keys or typematic, as required by the application.

The central portion of the keyboard is a

5V DC), ground, two

15-degree

tilt orientation).

L._L

4-2

“i//

The microprocessor in the keyboard performs several functions, including a power-on self test when requested by the system unit. This test checks the microprocessor ROM, tests memory, and checks for stuck keys. Additional functions are keyboard scanning, buffering of up to 16 key scan codes, maintaining bidirectional serial communications with the system unit, and executing the handshake protocol required by each scan-code transfer.

Vertical Mounting Not

Supported

IBM does not support operating the 5160 in a vertical position. Loss of customer data could occur if the system is operated in this manner.

Power Diagnostic Tips

5150/5160-Based

System

Dead Machine Tips

Diagnostics

General Diagnostic Tips

Power-On Self Test

Each time you set the system unit’s power switch to on, the power-on self test (POST) executes. The POST takes 13 to 90 seconds to complete, depending on the options installed.

The POST checks the following:

System board

Memory expansion adapters

Keyboard

Primary display

Diskette drive and adapter

Fixed disk drive and adapter (if available).

start the POST:

Turn on all external devices, including printer,

1. display, and plotter. Set the power switch on the expansion unit (if

2. attached) to on. Set the system unit power switch to on.

3. Turn the brightness and contrast knobs fully

4. clockwise. (If you have a color monitor, ensure that it is set to on.) Watch (and listen) for the following responses:

a. A cursor appears on the display in approxi-

mately 4 seconds.

b. While the memory is being tested, the memory

size appears in the top left corner of the screen and increases in 64Kb increments until the total system memory is tested. This is not applicable to the 5150 PC.

c. One short beep is heard when the POST is suc-

cessfully completed.

d. The IBM Personal Computer basic screen

appears if a diskette or an operating system is

not automatically loaded from a fixed disk drive.

Verify that the outlet has good power and that power cord is good. Disconnect all external I/O cables from PC

(external I/O may cause power problems). If installed, remove the math coprocessor.

Remove disk drive power connectors one at a time

from the disk drive logic board (a failing logic

board may cause power problems).

Check voltages exiting power supply to system

board.

Check system board ohm resistance.

System Board Power

1. Set the power switch on the system unit to off.

2. Set your meter to the 12V DC scale.

3. Refer to Figure 4-6 on page 4-4 and connect the common lead to pin 5 and the voltage lead to pin 1

of the system board power connector.

4. Set the power switch on the system unit to on.

Check for a voltage reading of

DC.

Leave your meter set on the 12V DC scale and check the rest of the power supply voltages to the system board (see Figure 4-5.)

Voltage Connectors

Min V DC Max V DC

+ 4.8

+ 4.6 + 11.5 + 10.9

Figure 4-5. Power Supply Voltages

+5.25

+ 5.5 + 12.6 + 13.2

2.4V

DC to

-Lead + Lead 5 9 7

5.2V

6 3 8

Chapter 4. 5150 PC 4-3

44443

System

Board Connectors

Power Supply Fan Connector

IBM Display Connector

Power Connectors

&PINl,-12VDC

Key

PIN 2. GROUND

PIN 2, GROUND PIN 1.

+12V

+5V

+12V +5V

+12V +5V +5V +5V

+12V

DC DC DC DC

LEX40157

PIN 4, PIN 3, GROUND PIN 2, GROUND PIN 1, PIN 4. PIN 3, GROUND PIN 2, GROUND PIN 1, PIN 6, PIN 5,

PIN 4, PIN 3. -5V DC PIN 2, GROUND

FIM br wti/%

PIN 5: GROUND PIN 4, -12V DC PIN 3, PIN 2. KEY PIN 1, PWR GOOD

‘d

Power Supply

LEX40155

Figure 4-6. Board Power Connectors

Power Supply Voltage

Checks

If the power supply is not connected, to the system board or the disk/diskette drives, the power supply voltages cannot be correctly measured unless loaded with a

1.5-ohm,

25-watt resistor. The resistor must be

connected across the power supply connector P 9 pins

1 and 6.

There is a

3-ohm,

25-watt wire-wound resistor P/NO337213 available. Use two resistors in parallel to obtain

1.5-ohms

IBM. Monochrome Display Power Connector (Internally Switched)

5.25-Inch

resistance.

Diskette Drive

System Unit Power Connector

Figure 4-8. 5155 Portable PC

System/Memory Diagnostic

Tips

Failing Memory Module Isolation

There are times when diagnostics do not show when a

memory problem is present on a machine. If a customer program or another diagnostic fails, the following procedure may be helpful in identifying the failing memory module.

A failing memory module can be isolated by changing the configuration switch settings. Each bank of memory modules is either 64Kb or 16Kb depending on the system board. When a memory failure is detected, reducing the size of memory by an entire bank can be achieved by changing the system configuration switches.

The following procedure should be used while running memory diagnostics:

Configure the switch settings to reduce one bank of memory at a time until the memory error is no longer present. When the error is no longer present, the last bank of modules eliminated is the failing bank. The failing module can be identified by configuring the machine back to the switch settings of the last failure. Then, swap out individual modules of the failing bank until the error goes away.

Figure 4-7. Voltage Checks

4-4

LEX40156

Potential Memory Module Problem on Adapter Cards

Replace adapter cards containing potentially defective soldered memory modules and pluggable memory

modules on the Enhanced Graphics Adapter (EGA)

Expansion card when diagnostics indicate an adapter or memory module failure.

Machines and Devices Affected

Type

4450

4455 5150 5160 5161 5170 5271 5273 5373 5531 7531 7532

Device Description

EGA Expansion Card

Card

EGA PS AT Card PS XT Card Extended Graphics Adapter (XGA) Card All Points Addressable (APA) Card

Hardware Maintenance and Service (HMS) manual maintenance analysis procedures (MAP module locations.

l EGA Memory Expansion card

(P/N6323468) (P/N8854219)

The following adapters have soldered modules:

EGA Card

APA Card PS XT Card

XGA AT Card

5150/4450

Module Bit/Bank

has pluggable memory modules located in bank 01, 02, and 03.

(P/N8654215)

(P/N8654390)

(P/N8654381)

(P/N2683118)

Failing Memory

Location

S) for bank and

Modules Positions U1,

2, 10, 11, 40, 41, 50, and 51 U65, 78, 91, and 103 U10,

23, 36, 49, 62, and 75 U11,

12, 24, 25, 38, 39, 52, 53, 63, 64, 74, and 75.

Replace memory modules numbered 8535 through 8544 that are labeled plant code G when diagnostics cate a memory module or adapter failure. When the memory modules are soldered, refer only to the number code 8635 through 8544 on the top of the memory module and replace the adapter card if applicable. When the memory modules are pluggable, refer to both top and bottom view and replace all of the affected modules during a repair action. The affected modules do not affect data.

Top View

uuuuuuuu

Bottom View

‘__/’

64Kb memory module locations are designated by location numbers on the adapter card. Refer to the

G = Plant Affected

indi-

LEX41870

Connections

16-64K

CPU or

64Kb-256Kb

Output

LEX40149

Figure 4-9.

5150/4450

Location

Memory Module Bit/Bank

16Kb to 64Kb System Unit

When there is a memory failure, the address of the failure appears as a 4-character alphanumeric error code, followed by 201. If the first character of the error code is 0, you have a system board failure. The second character 0, 4, 8, or C indicates which bank has the failing module. The third and fourth characters of the 4-character error code indicate which bit (module) of the bank failed (P, 0, 1, 2, 3, 4, 5, 6, 7). For example,

Chapter 4. 5150 PC

4-5

error code

OC40

201 means that the module indicated by the arrow in Figure 4-10 on page 4-6 (bank 3, bit 6) is the one that failed.

(Last 2 characters of error code)

Top View of System Board

(Last 2 characters

Top View of System Board

of error code)

LEX40150

Figure 4-10. System Board (Top View)

64Kb to 256Kb System Unit

When there is a memory failure, the address of the failure appears as a 4-character alphanumeric error code, followed by 201. If the first character of the error code is 0, 1, 2, or 3, you have a system board failure. The 0, 1, 2, or 3 indicates which bank has the failing module. The third and fourth characters of the 4-character error code indicate which bit (module) of the bank failed (P, 0, 1, 2, 3, 4, 5, 6, or 7). For example, error code 3040 201 means that the module indicated by the arrow in Figure 4-11 (bank 3, bit 6) is the one that failed.

Figure 4-l. . System Board (Top View)

5160/5155/XT370/5531/4455

Failing Memory Module

Bit/Bank Location

Color Trimmer

Capacitor Keyboard I/O

Speaker Output

Note: Banks 0 and 1 may contain 256K RAM modules

5160modules

088,089,

267,268,277,

LEX40151

System Board Power Connections

and

278.

4-6

LEX41700

Figure 4-12.

5160/5155/XT370/5531/4455

Bit/Bank

Location

When there is a memory failure, the address of the failure appears as a 7-character alphanumeric error code, followed by 201. If the first character of the error code is 0, 1, 2, or 3, you have a system board failure. The 0, 1, 2, or 3 indicates which bank has the failing module. The sixth and seventh characters of

the

7-character

ofthebankfailed

\iQj

error code 3COO0 40 201 means that the module indicated by the arrow in Figure 4-13 (bank 3, bit 6) is the one that failed.

Memory error, memory lock, or a blank display may occur if you plug one or more chips in wrong when you are replacing the system board or system memory.

Figure 4-13. System Board (Top View)

256Kb/640Kb

error code indicate which bit (module)

(P,

0,1,2,3,4,5,

02 04 08

System Board

Memory Problems

The E-2 jumper located next to the power supply on

the system board is needed to support 256Kb modules in banks 0 and 1. Without this jumper, 640Kb on the system board will appear in POST and diagnostics as

256Kb.

256Kb/640Kb

System Board

Labeled Wrong

PC XT 5160s (Models 088, 089, 267, 277, 278) have some system boards labeled wrong. The boards are labeled 64Kb/256Kb. 256Kb/640Kb presence of a module in position U84. The board has no module in this position.

They should be labeled

board can be identified by looking for the

Bits

Front

For

7).

256Kb/640Kb.

example,

LEX40153

64Kb/256Kb

Interrupt Level Information

Interrupt levels are used by PCs to prioritize operations. Diagnostics will not necessarily fail on a PC with interrupt conflicts, yet the operator will keep getting errors. Although the customer is responsible

for solving interrupt conflicts, an IBM service representative can use this information to reduce diagnostic time,

NTFs,

unnecessary parts replacements, and

callbacks. To determine whether an unusual PC problem is

caused by conflicting interrupt levels, follow these steps:

Load the advanced diagnostics diskette, go to the list of installed devices, and copy that list.

Examine the adapter cards installed in the system unit and expansion unit. If any cards are located that are not on the list from Step 1, add them to the list.

Sort the list into the following interrupt levels:

1.2.Kevboard Enhanced Graphics Adapter 3278/79 Primary PC Network Adapter

ALT ASYNC Communications Adapter

3. (COM2)

ALT BISYNC Communications Adapter

(COM2)

ALT Serial/Parallel Adapter-Serial Port ALT PC Network Adapter

SDLC Communications Adapter

PC Cluster Adapter (selected by a jumper) Display Station Emulation Adapter (selected by a jumper) ASYNC Communications Adapter

4. BISYNC Communications Adapter Serial/Parallel Adapter-Serial Port SDLC Communications Adapter

Fixed Disk Adapter (except in Personal Computer AT) ALT Serial/Parallel Adapter-Parallel Port Display Station Emulation Adapter (selected by a jumper)

Diskette Drive Adapter

Printer Adapter Monochrome and Printer Adapter

Cluster Adapter (selected by a jumper)

Serial/Parallel Adapter-Parallel Port General Process Interface Bus (GPIB) Adapter(s) Data Acquisition Adapter(s).

If you find two cards with the same interrupt, remove one of them and see whether the failure symptom disappears.

Emulation Adapter

(COMl)

(COM1)

These steps are similar to the intermittent problem steps in the HMS manual. The most important point

of this tip is that when a failure symptom is isolated to

Chapter 4. 5150 PC

4-7

one adapter card, that card is not necessarily defective, but may be incompatible with the other cards in the PC. Incompatibility can also be caused by factors

other than interrupt (such as memory address and

DMA). Also, conflicting interrupts will not always

cause failures. Note:Some adapter cards have a jumper for interrupt

selection. For those cards and for cards not listed here (including non-IBM cards), see the card’s setup guide or technical specifications. Due to rapid product announcements, this list cannot describe all the available IBM PC option cards.

Keyboard Voltage Check at System Board

Pin TTL Signal

1 + Keyboard Clock 2 + Keyboard Data 3 -Keyboard Reset (Not used

by keyboard) Power Supply Voltages 4 Ground

5 +5

Volts

Signal Level

+5V DC +5V DC

Voltage 0

+5V DC

Math Coprocessor Installation (5150 Only)

Installation of the math coprocessor feature requires the replacement of the 8088 Processor module on the system

Coprocessor module. If the 8088 Processor is soldered to a P/N8529328), 8088, the board must be replaced with a new 16Kb/64Kb

board

and addition of an 8087 Math

16Kb/64Kb

system board (P/N8529205 or

which prevents installation of a new

system board from stock. See ECA004.

Speaker Continuity

Set the power switch on the system unit to off.

Set your meter to the ohms x 1 scale.

Remove the speaker connector from the system

3. board. Connect the meter leads to the speaker, as shown,

4. to check for continuity.

System

Board

Figure 4-15. Keyboard Interface Connector Specifica-

tions

Connector

Speaker

Figure 4-14. Speaker Continuity Check

4-8

LEX40161

Figure 4-16. Keyboard Connector Location

LEX40160

5155 Portable Keyboard Voltage Check

Keyboard Cable Connections

DIN

Connector Connector

Figure 4-17. Keyboard Cable Connections

Modular

Keyboard

Connector

LEX40162

Diskette Drive/Fixed Disk Drive Diagnostic Tips

Hard-Sector Diskettes

Hard-sectored, double-index-hole diskettes will not work with IBM PC products. Soft-sectored, index-hole diskettes must be used.

Diskette Drive Type 2 Read/Write Errors

If you are experiencing read/write errors on PCs equipped with Type 2 diskette drives, check the file

control card on the diskette drive. If the numbers stamped or printed along the left edge of the card are 010, remove capacitor C39 from the card. This

capacitor is mounted on the lower left corner of the

card. This is the opposite end from the power connector. The capacitor is mounted between modules 4B and 5B. This capacitor is generating noise on the

card, which causes the errors.

single-

Modular Connector

Figure 4-18. Modular Connector Location

LEX40163

Terminating Resistor on

Replacement Drives

When replacing a disk/diskette drive, the terminating resistor should be installed on the replacement drive, if

one was installed on the defective drive. Intermittent problems can occur if the disk/diskette

drive cable is not terminated. The cable is terminated by the use of a terminator resistor installed on the unit logic card. When replacing a disk/diskette drive,

check to see whether a terminator is installed on the

defective drive. If so, install a terminator resistor on

the replacement drive. The terminator resistor should be installed on the drive that is the last physical unit

on the cable. Both the disk and diskette drive cables

must have terminating resistors.

Diskeite

Read/write errors can occur when the display is mounted on the system unit. The errors might he

caused by the flyback transformer in the display. The problem can occur with both the color and monochrome monitors. The transformer creates a mag-

netic field around the PC, which causes the errors,

The preferred solution to the problem is to move the

display; if this cannot be done, replace the failing diskette drive. Some of the diskette drives are less susceptible than others to this problem.

Drive Errors

Chapter 4. 5150 PC

4-9

Track 40 Error/Type 3 Drives Diskette Drive Cable Continuity

The Type 3 diskette drive will not read data from track 40 of diskettes. The IBM specifications allow the use of tracks 0

39 and the Type 3 drive meets these specifications. The use of track 40 or above is not supported by IBM. Some software vendors have used track 40 in their software packages.

The Type 3 drive can be identified by a large heat sink on the rear of the drive logic board. Further identification can be made by checking for an E at the beginning of the serial number. The serial number on the Type 3 drive is located inside the drive on the right front corner and is visible through the top of the drive with the diskette removed and the diskette latch open.

DISKCOPY

Problems Using Type

3 Diskette Drive

DOS DISKCOPY might not function correctly under certain unique circumstances, when using the same diskette drive for both source and target diskettes on the PC (5150) and PC XT (5160).

The DOS DISKCOPY procedure might not function correctly on a Personal Computer or Personal Computer XT which has a Type 3 diskette drive(s), less than 416Kb of memory, and is using an unformatted target diskette. To prevent this problem, use formatted target diskettes when running DISKCOPY. After using DISKCOPY, a directory should be run to ensure that all files were copied. If the use of formatted diskettes is not an acceptable solution, exchange the diskette drive. See ECA015.

Diskette Drive Inserts

Diskette drive inserts can be ordered from Parts Distribution, using damage when the unit is shipped. An insert should be

placed inside the diskette drive for the following conditions:

l Shipping a machine to and from a repair center

l Returning a machine to customers when transpor-

tation is involved

l Returning defective drives.

P/N6447190.

The inserts prevent head

1. Set the meter on the ohms x 1 scale.

2. Refer to Figure 4-19 and check the continuity of the signal cable. The meter should indicate approximately 0 ohms.

Diskette

Signal-Cable Connector

Even Pin

Diskette 2 2

4 4 6 6 8 8

10 12 14 14 12 16 10

18 20 20 22 22 24 26 26 28

30 30 32 32

34 34 Diskette Drive B

Signal-Cable Connector Even Pin

Diskette 2 2

4 4 6 6 8 8 10 10 12 12 14 16 16 18 18 20 20 22 22 24 24 26 26 28 28 30 30 32 32 34

Drive A

Numbering Adapter

Diskette Drive A Signal-Cable Connector

Odd Pin Diskette

1 1 3 5 5

7 9 9

13 13

19 19 21 23 23 25 25 27 27

29 31 31

33 33 Diskette Drive B

Signal-Cable Connector Odd Pin Numbering

Diskette Adapter

1 3 5 5

777

9 9 11 11 13 13 16 15 17

19 21 21 23 23 25 25 27 27 29 31 33 33

Numbering Adapter

11 17

1 3

17 19

29 31

Figure 4-19. Diskette Drive Connector Adapters

This insert should be used on the 5150 and 5160 Types 1, 2, and 3 diskette drives only.

4-10

Diskette Drive Cable

Diskette Drive Power

Check the diskette drive signal cable for shorts as follows:

1. Set the power switch on the system unit (and expansion unit, if attached) to off.

2. Disconnect the diskette drive signal cable from the Diskette Drive Adapter and the diskette drive.

3. Carefully inspect the cable connectors for bent or

broken contacts. Inspect the connectors on the

adapter and on the diskette drive logic board for cracks or corrosion.

4. Set the meter on the ohms x

scale.

5. Using the adapter end of the cable, check for shorts by touching the other meter probe to pin 2. The meter should indicate infinity. Check pin 2 to pin 3, pin 3 to pin 4, and so on until all pins have been checked.

All Three Conn Are Numbered

Check the diskette drive power connector for the voltages shown in the table below.

Diskette Drive Power Connector

Min V DC

4.8

11.6

Max V DC

+5.2

12.6

-Lead 2 3

+ Lead

Figure 4-21. Diskette Drive Power Connector Volt-

ages

Pins

LEX40159

Figure 4-20.

Diskette

Drive Cable Connectors

LEX40158

Figure 4-22. Connector Pins

Moving System with Fixed Disk

Warning: Normal shipping and handling can result in permanent loss of all data on the fixed disk drives and increase the possibility of shipping damage for a 5160 or a 5161.

To prepare the system unit and expansion unit fixed disk for moving, use the following procedure.

Load the diagnostic routines and select Option-3, Prepare Fixed Disk for Relocation. This moves the disk head over the highest available cylinder (beyond the data area). This is the designated position when moving the system or expansion unit.

Fixed Disks Ready for Shipping appears on the monitor when the relocation routine completes successfully.

The system or expansion unit is now ready to be prepared for shipment.

Chapter 4. 5150 PC

4-11

Determining Available Space on

Fixed Disk

DOS CHKDSK checks for the amount of usable space on the disk surface. Do not replace the fixed disk if the usable area exceeds the specified disk capacity; that is, 10 or 20 megabytes. The following process may

be used to determine the number of bytes required for

different capacity drives: Note:

1 byte = 1.024

1.024 x Disk Capacity = Total Number of Bytes Required

Examples follow:

1.024 x

After determining the number of bytes required, refer the customer to the DOS manual to run the CHKDSK procedure.

10,000,000 20,000,000 30,000,000

10,240, 000

(10Mb)

20,480,000

(20Mb)

30,720,000

(30Mb)

bytes

bytes bytes

If the resulting number is less than 20Mb:

l Ensure that a 20Mb Fixed Disk Adapter is

installed. (Check for the presence of the drive type switch block.)

l Ensure that the switch settings on the Fixed Disk

Adapter card are set for the correct drive type.

Upon completion of the repair action, the customer may need to do the following:

Perform the DOS FDISK command. Run the DOS CHKDSK command to ensure that the fixed disk has 20Mb or more of usable storage space. Run the DOS FORMAT command. Do a restore of the system and data files.

20M b Type 13 ldentification

Label

5160 Models 088 and 089 contain a 20Mb fixed disk drive. The 20Mb Type 13 drive manufactured by IBM

can be identified by the designation WD25 on a label at the upper left-hand side of the black cover enclosing the drive when the Type 13 sticker is not present.

To calculate the number of good bytes on the disk, do the following:

Subtract Bytes in Bad Sectors From

If the resulting number is greater than the calculated total number of bytes required (above), the drive is good. This tip also applies to the 5170 hard files.

Bytes Total Disk Space.

Insufficient Storage Space

The following information may be used in conjunction with the advanced diagnostics in diagnosing problems encountered involving insufficient storage space on the 5160 20Mb Fixed Disk.

Note: system and the data files prior to beginning any repair actions. Backup may not be possible after the repair action has taken place.

The customer should have backed up the

l Ensure that when the customer runs the DOS

CHKDSK, the number of Bytes in Bad Sectors is subtracted from Bytes Total Disk Space. If the resulting number is

greater, the fixed disk drive is good and should not

be replaced.

20,480,000

bytes (20Mb) or

OMb

IBM-manufactured Personal Computer fixed disks of

10Mb, high-pitched noise.

IBM-manufactured fixed disks with a serial number of F274092 or lower could produce a high-pitched noise from the static eliminator during normal customer operation. This will not cause any operational problems. If your system is exhibiting this noise problem, ensure that all data/programs on the fixed disk are backed up. Replace the fixed disk.

The drive can be identified by a black cover over the disk area and a label at the rear of the drive which reads Manufactured by IBM. See

Fixed Disk Noise

serial number F274092 or lower, could create a

ECA019.

4-12

Warning:

Formatting a Fixed Disk Drive

Formatting will destroy all data on the fixed disk drive. After formatting your fixed disk drive, the drive will have to be made ready to accept data. Refer to your disk operating system manual for the needed commands. The backup data may then be loaded onto the fixed disk drive.

Installing Fixed Disk Drive Cable

1OMb

Fixed Disk Drive

When installing the cable P/N8529271 from the or

lOMb/ZOMb

drive, the cable must be plugged into the adapter with the trace wires facing up, away from the system board.

Adapter card to the

10Mb

fixed disk

1OMb

‘\--i

Before replacing a failing fixed disk drive, first try to format it, then run the diagnostic tests again. After formatting it, perform the diagnostic tests. Because formatting destroys all data on the drive, do it as the last step before replacing the drive. After you format the drive, you may reload the data from your backup diskette.

To format a fixed disk drive:

Set the power switch on the system unit (and

expansion unit, if attached) to off. Install the fixed disk drive and connect any data

and control connectors that were disconnected during testing. Insert your advanced diagnostics diskette in drive

A. Set the power switch on the expansion unit (if

attached) and system unit to on.

10.

11.

12.

13.

After the diskette loads, press

NOSTIC ROUTINES), then Enter. Depending on the configuration of your system, questions about attached devices might appear on your screen. Enter. Press Y or N (IS THE LIST CORRECT?) then

Enter. (If the list is not correct, follow the instructions on your screen and correct the list before answering yes. If you cannot correct the list, you still must answer yes before you can continue.) When the System Checkout menu appears, press

(RUN TEST ONE TIME), then Enter. Select 17 (FIXED DISK DRIVE(S)

then press Enter. Press 2 (FORMAT FIXED DISK), then Enter. When ENTER DRIVE ID C/D appears, press C or D (depending on which drive you want to format), then press Enter. When ARE YOU SURE YOU WANT TO

ConTINUE appears, press Y, then Enter. Before turning system over to customer or transferring customer data to fixed disk, perform the DOS FDISK and then the DOS FORMAT. This will further ensure proper operation of the fixed disk. See your DOS manual for FDISK and FORMAT procedures.

Press Y or N as required, then press

(RUN DIAG-

ADAPTER),

20Mb Fixed Disk Drive

When installing the cable P/N6480086 from the

lOMb/ZOMb

the cable must be plugged into the adapter with the trace wire facing down, toward the system board.

Adapter card to the

2OMb

fixed disk drive,

Communications Diagnostic

Tips

ASYNC

Expansion slot 8 on the system ferent in that any card placed in that slot is expected to respond with a Card Selected Signal. Only one IBM card provides this signal, the Asynchronous (ASYNC)

Communications Adapter. To provide this signal, the ASYNC Communications card must have Jumper J-13 installed. Any card placed in that slot that does not

provide a Card Selected Signal will not be recognized

as being installed.

1101 Errors

When running the asynchronous diagnostics on a 5150

PC or a 5160 PC XT, the ASYNC card P/N8529150 must be set for

errors will result during testing. After testing, return

the card to its original position if the customer uses

current loop interface.

Down-Level DSEA (IBM Customer Engineer Only)

There are two levels of the PC Display Station Emu-

lation Adapter (DSEA). The early level,

was shipped only to IBM internal accounts. It has a

twinaxial connector attached directly to the adapter

bracket. The new level was shipped to customers and

P/N6851206. attached to the adapter bracket. IBM customer engineers service the new level of adapter only. Internal sites with the early level card must go through AAS to acquire the new level.

Card Jumper

board is

RS232C

It has a

Interface. Otherwise, 1101

15-pin

D-type shell connector

slightly dif-

P/N6851163,

Chapter 4. 5150 PC

4-13

Communication Problems with Professional Graphics Controller

Machines Affected: 5160, 5161, and 5170 Early level professional graphics controllers (PGCs),

P/N6181765,

FRU ficulties when installed in a system with communication adapters. Affected speed to 300 baud. Text received at higher speeds may be garbled. The current level of PGC allows transmission speeds up to 9600 baud.

Early level cards have the assembly number 6323697 printed on the left edge of the component side of the memory card (the only card whose component side is completely visible). Later level cards have the 6323697 covered and the assembly numbers 6448811 or printed under the J2 connector. J2 is located in the upper left component side of the same card.

The current level card corrects these communication performance problems by allowing line speeds up to 9600 baud.

Early level cards (assembly number 6323697) that exhibit these communication limitations should be replaced with the ne w FRU, number 62X0912. See ECA013.

Note: the only level Model 339. The Model 339 uses an 8 MHz system clock and requires the

PGCs

may be subject to communication dif-

PGCs

may limit transmission

with the assembly number

PGCs

that will operate in the PC AT

62X0914

assembly to operate.

62X0914

are

Configuring Personal Computer with Displaywriter Attachment

Refer to the IBM Displaywriter Personal Computer Attach Program Description Operation s manual,

G544-2280. enced documentation fails to instruct the customer on how to configure the Asynchronous Communications Adapter properly in conjunction with this feature. The adapter should be set to COM1. The Asynchronous

Communications Adapters are already configured from the supplier for fail to operate with the adapter configured in the current loop mode. Refer to the Hardware Mainte- nance and Servic e manual for the adapter configurations.

In Chapter 3, “Customer Setup,” the refer-

COM1

and

RS232C.

The feature will

Communication Problems when DSEA Is Installed

5150 (PC) and 5160 (PC XT) communications-related problems can be caused by down-level system boards.

Some PC and PC XT communications-related problems cannot be resolved with normal diagnostics when the

Display Station Emulation Adapter (DSEA) is

installed. Symptoms include, but are not limited to:

l No communications at all l One or more units dropping offline at any time l Seemingly unrelated error codes (301, 516, 508, 548,

and others) at various times or simultaneously on a single unit.

If all ASYNC, BISYNC, SDLC, and/or DSEA parameters are correct, look at the system board to identify the processor module, located in position U35 (5150) or U28 (5160). If the module is an AMD 8237 or 9517, look for the presence of a following locations on the system board.

On the 5150 System Board, the located in position U101 or the spare position. On the 5160 System Board, the in position without the locations, and experiencing problems with DSEA, should be replaced. See ECA005.

U90

or the spare position. System boards

74LS32

module in one of the above

5150/5160-Based

74LS32

module in one of the

74LS32

module will be located

System

module will be

Diagnostic Information

For a Symptom-to-FRU Index and additional diagnostics information, refer to the Service Summary cards supplied with this manual.

5150 PC Switch Settings

Switches in your system are set to reflect the addition

of memory and other installed options. Switches are located on the system board, Extender card, and memory expansion options.

The switches are dual in-line package (DIP) switches and are easily set with a ballpoint pen. Refer to the charts on the following pages to determine the correct switch settings for your system. Slide DIP switches

are set by sliding the switch with a ballpoint pen, while rocker switches are set by pressing the rocker to the desired position, as shown in Figure 4-23.

4-14

July 1989)to

SA38-0037-00

Ballpoint

I I Pen

Ballpoint

I I

Pen

Rocker

Switch

LEX40106

Figure 4-23. DIP Slide and Rocker Switch Note:The system board type (16Kb/64Kb CPU system

board or the left edge of the system board.

The following figures show switches on the system board. These settings are necessary for the system to

address the attached devices and to specify the amount of memory on the system board.

64Kb/256Kb

CPU system board) is printed on

Switch Block 2

LEX40188

Switch Position

l-2-3-4-5

6-7-8

Switch Function

Amount of memory options installed. Always in the off position.

Monitor Type Switch Settings

The following shows the settings for positions 5 and 6:

No Monitor or IBM EGA either by itself or in

yr$;~~;;;h

IBM

Monochrome and Printer Adapter alone or in combination with an IBM Color Graphics Monitor Adapter

another

Display

Switch Block 1

Iz3

4 5 6 7 8

Switch Block 2

’

~._/

Switch Block 1

LEX40187

Switch Position

l-7-8

3-4 5-6

Note: Total system memory includes memory options.

Switch Function

Number of

5.25-inch

diskette drives installed. Math coprocessor: off if coprocessor is installed; must be on if coprocessor is not installed. Amount of memory on the system board. Type of display adapters installed.

40x25 Color

80x25 Color

LEX40311

Figure 4-24. Monitor Type Switch Settings

Chapter 4. 5150 PC

4-15

Diskette Drive Switch Settings

SN27-0786-00

(21

July 1989) to

SA38-0037-00

The following are the settings for positions 7 and 8, switch 1 is always on:

1 - Drive

2 - Drives

3 - Drives

4 - Drives

Figure 4-25. 5.25Inch Diskette Drive Switch Settings

mm1

LEX40240

Extender Card Switch Settings

The following chart shows the switch settings of the extender card switch block in conjunction with memory of various sizes:

-:,

224K to 256K

416K

to 448K

Figure 4-26. Extender Card Switch Settings

4-16

LEX40194

,_‘

Switch Settings: System Board Memory

(16Kb-64Kb

CPU)

-i/

The following figures show switch settings for a range of system board memory from 16Kb to tional memory up to 576Kb.

16Kb Total Memory

System Board Switches

Switch Block

‘I

Jda/

Switch Block 2

32Kb Total Memory

System Board Switches

Switch Block 1

Switch Block 2

64Kb,

I;bir]

plus addi-

LEX40195

LEX40196

System Board Switches

48Kb Total Memory

Switch Block 1

64Kb Total Memory

Switch Block 1

(ibdl

Switch Block 2

LEX40197

LEX40198

Chapter 4. 5150 PC

4-17

96Kb

Total Memory (32Kb + 64Kb on System Board)

System Board Switches

32K option

128Kb Total Memory (64Kb + 64Kb on System Board)

System Board Switches

Switch Block 1

64/266U

Switch Block 1

64/256K

Card Switches

Option

Card Switches

Option

64K Option

Card Switches

64K Option

Card Switches

Switch Block 2

32K Option

Card Switches

32K Option

Card Switches

LEX40199

64/256K

1 - 64K option

2 32K options

option with 64K installed

LEX40200

4-18

160Kb Total Memory (96Kb + 64Kb on System Board)

System Board Switches

1 -

64/256K

32K option

1 - 64K option 1 - 32K option

3 - 32K options

option with

64K

installed

Switch Block 1

64/256K

Option

Card Switches

64K Option

Card Switches

Switch Block 2

32K Option

Card Switches

LEX40201

Chapter 4. 5150 PC

4-19

Chapter 5. 5155 Portable

:_:

Drive A

LEX41803

Figure 5-1. 5155 Portable

The 5155 consists of a lightweight casing with a carrying handle containing a built-in 9-inch amber composite display and one

5.25-inch

Slimline, double-sided diskette drive (with space available for an optional second drive). The system board is the same as that of the 5160 PC XT with 256Kb of memory.

49.5

Noise Level

Electrical

Nominal Minimum Maximum

kva

dBa

System unit with

monochrome display

and expansion unit attached.

12OV

104V

127V AC

0.32 max.

Figure 5-2 (Part 2 of 2). 5155 Specifications

Power Supply

Power

Supply Fan Connector

IBM Display Connector

Voltage

Selector Switch

5.25-Inch Power Connectors

--‘-x_

Diskette Drive

PI 3 PI 2

PI 1

P10

‘d

Unit Specifications

Size

Height Width

Depth

Weight

Power Cable

Length Size

Environment

Air Temperature

System On

System Off

Humidity

System On System Off

Heat Output

Figure 5-2 (Part 1 of 2). 5155 Specifications

204

in)

500

mm (20 in)

430

mm (17 in)

13.6 kg

1.83 m (6 ft) 18 AWG

15.6 deg. to 32.2 deg. C (60

(50

20%

650 BTU/hr

(30

lb)

deg. to 90 deg. F)

deg. to 43 deg. C

deg. to

8% to 88%

110

80%

max.

deg. F)

On/Off

Switch

Power Supply Fan

System Board Power Connectors

LEX40075

Figure 5-3. 5155 Power Supply and Connectors The system unit’s power supply is a

114-watt,

switching

regulator that provides five outputs. It supplies power

for the system unit and its options, the power supply fan, diskette drive, composite display, and keyboard. All power levels are protected against overvoltage and

overcurrent conditions. The input voltage selector switch has

115V

AC and 230V AC positions. If a DC overload or overvoltage condition exists, the power supply automatically shuts down until the condition is corrected, and the power supply is switched off and then on.

The internal and the + 12V DC power levels. Both the +

5.25-inch

diskette drive uses the + 5V DC

12V

DC and -12V DC power levels are used in the drivers and receivers of the optional communications adapters.

12V

The display uses a separate +

DC power level.

Chapter 5. 5155 Portable

5-1

The + 5V DC, -5V DC, +

levels are bussed across the system expansion slots.

12V

DC, and -12V DC power

Keyboard

The IBM Portable Personal Computer keyboard cable

is a detachable, 4-wire, shielded cable that connects to a modular connector in the front panel of the system

(+ 5V

unit. The cable has power bidirectional signal lines in it.

long and is coiled.

All other functions of the keyboard are identical to the 5150 keyboard.

DC), ground, and two

is 762 mm (30 in)

5155 PC Portable Diagnostic Information

For diagnostic information, refer to System Diagnostics” on page 4-3. For a

Symptom-to-FRU Index and further diagnostic informa-

tion, refer to the Service Summary cards supplied with this manual.

“5150/5160-Based

5155 PC Portable Switch Settings

For 5155 PC switch setting information, refer to “5160

PC XT Switch Settings” on page 6-3. Note: 5155 PC and 5160 PC XT switch settings are

the

5-2

Chapter 6. 5160 PC XT

Diskette Drive

Fixed Disk Drive

LEX40076

Figure 6-1. 5160 PC XT

The 5160 Personal Computer XT is an extended version of the 5150 Personal Computer. A typical PC XT features one

5.25-inch,

360Kb diskette drive, 256Kb memory, Asynchronous Communications Adapter, and a

10Mb

or 20Mb fixed disk drive. There are numerous configurations ranging from stand-alone models to host interactive models.

Unit Specifications

Noise Level

Electrical

Nominal Minimum Maximum

kva

Figure 6-2 (Part 2 of 2). 5160 Specifications

49.5

dBa

System unit with monochrome display and expansion unit attached.

120V AC

104V

127V AC

0.41 max.

System Board

Connections

ROM

BASIC

System Unit Size

Height Length

Depth Weight Power Cable

Length

Size Environment

Air Temperature

System On System Off

Humidity

System On System Off

Heat Output

142 mm (5.5 in) 500 mm (19.6 in) 410 mm (16.1 in)

14.5 kg (32 lb)

1.83 m (6 ft) 18 AWG

32.2”C

15.6” to (60” to 90°F) 10” to 43°C (50” to 110°F)

8% to 80% 20% to 80%

750 BTU/hr max.

LEX40077

Figure 6-3. 5160 System Board Component Diagram

The system board fits horizontally in the base of the system unit of the Personal Computer XT and Portable Personal Computer. It is a multilayer,

single-land-per-

channel design with ground and internal planes pro-

vided. DC power and a signal from the power supply

enter the board through two 6-pin connectors. Other

connectors on the board are for attaching the keyboard and speaker. Eight 62-pin card-edge sockets are also mounted on the board. The I/O channel is bussed across these eight I/O slots. Slot J8 is slightly different from the others in that any card placed in it is

expected to respond with a card selected signal whenever the card is selected.

A dual in-line package (DIP) switch (one 8-switch pack) is mounted on the board and can be read under program control. The DIP switch provides the system

Chapter 6. 5160 PC XT

6-l

programs with information about the installed options, how much storage the system board has, what type of display adapter is installed, what operation modes are desired when power is switched on (color or black-andwhite,

80-

or 40-character lines), and the number of

diskette drives attached. The system board contains the adapter circuits for

attaching the serial interface from the keyboard: These circuits generate an interrupt to the microprocessor when a complete scan code is received. The interface can request execution of a diagnostic test in the keyboard.

Power Supply

5.25-Inch

Fixed Disk Drive

Diskette

Drive

The system board consists of five functional areas: the processor subsystem and its support elements, the

readonly memory (ROM) subsystem, the read/write (R/W) memory subsystem, integrated I/O adapters, and the I/O channel.

Microprocessor

The heart of the system board is the Intel 8088 Microprocessor. This is an 8-bit external-bus version of

16-bit

Intel’s compatible with the 8086. Thus, the 8088 supports 16-bit operations, including multiply and divide, and supports 20 bits of addressing. It also operates in maximum mode so a co-microprocessor can be added as a feature. The microprocessor operates at 4.77 MHz.

256Kb 512Kb/640Kb*

PC/370 - P Card PC/3277 - EM Card

Printer/Register Adapter, Unique

Extender Card * Denotes features that are supported only on

5160

Models

8086 Microprocessor and it is software-

Memory

xxx1

088,089,267,268,277,

and

278.

511% Mod&

Power On/Off

IBM Monochrome Display Power Connector (Internally Switched)

System Unit

Power Connector

System Board Power Connector

LEX40078

Figure 6-4. 5160 Power Supply

The system DC power supply is a 130-watt, four

voltage-level switching regulator. It is integrated into the system unit and supplies power for the system unit, its options, and the keyboard. The supply provides 15

+5V

DC,

+5%;

A of of -5V DC,

4.2 A of + 12V DC,

flO%;

and 250 mA of -12V DC,

f5%;

300 mA

*lo%.

All

power levels are regulated with overvoltage and over-

current protection. There are two power supplies, 120V AC and

220/24OV

AC. Both are fused. If DC overcurrent or overvoltage conditions exist, the supply automatically shuts down until the condition is cor-

rected. The supply is designed for continuous opera-

tion at 130 watts.

The system board takes approximately 2 to 4 A of

+5V

DC, thus allowing approximately 11 A of + 5V DC for

the adapters in the system expansion slots. The + 12V

DC power level is designed to power the internal

5.25-inch The

diskette drive and the

-5V

DC level is used for analog circuits in the

1OMb

fixed disk drive.

diskette adapter’s phase-lock loop. The + 12V DC and

-12V DC are used for powering the Electronic Industries Association (EIA) drivers for the communications adapters. All four power levels are bussed across the eight system expansion slots.

The

IBM Monochrome Display has its own power supply, receiving its AC power from the system unit’s power system. The AC output for the display is switched on and off with the power switch and is a nonstandard connector, so only the IBM Monochrome Display can be connected.

6-2

Keyboard

The

83-key

keyboard is standard on all 5160 models,

excluding Models 089, 268, and 278. The 101-key keyboard is standard on 5160 Models 089,

268, and 278. Both the 83-key keyboard and the 101-key keyboard are

interchangeable only on 5160 Models 088, 089, 267, 268, 277, and 278. Models 088, 267, and 277 are identical to Models 089, 268, and 278, respectively, with the exception of the keyboards.

Math Coprocessor Switch

Settings

Figure 6-6 shows the settings for position 2:

Math Coprocessor Installed

Math Coprocessor Not Installed

5160 PC XT Diagnostic Information

For diagnostic information, refer to System Diagnostics” on page 4-3. For a Symptom-to-FRU Index and additional diagnostics information, refer to the Service Summary cards supplied with this manual.

“5150/5160-Based

5160 PC XT Switch Settings

Figure 6-5 shows switches on the system board. These settings are necessary for the system to address the attached devices and to specify the amount of memory on the system board.

Switch Block

LEX40233

Figure 6-5. Switch Block

LEX40234

Figure 6-6. Math Coprocessor Switch Settings

System Board Memory Switch Settings

The following figures show the settings for positions 3 and 4 for the amount of memory on the system board.

128K

192K

256K

LEX40235

Switch Switch Position Function

3-4 5-6 7-8

Normal operation, off (set to on to loop

POST). Math coprocessor: off if coprocessor is installed; on if coprocessor is not

installed. Amount of memory on the system board. Type of monitor you are using.

Number of

attached.

5.25-inch

diskette drives

Chapter 6. 5160 PC XT

6-3

Display Adapter Switch Settings

Diskette Drive Switch Settings

The following figures show the settings for positions 5 and 6:

No Display or IBM EGA either by itself or in

combination with another

Display Adapter

IBM Monochrome Display and Printer Adapter alone or in combination with an IBM Color Graphics Monitor Adapter

40x25 Color

80x25 Color

Switch Block 1

LEX43131

Figure 6-7. Monitor Type Switch Settings

Note: See Chapter 10, “3270 PC Products,” for 3270 unique switch settings.

10/20Mb

Fixed Disk Drive

Adapter Card Switch Settings

The following are the settings for positions 7 and 8:

1 - Drive

2 - Drives

3 - Drives

4 - Drives

I;hl

IrjiCbbdii4(

I;bI

LEX40240

Note:

6-4

Type 13

Type 16

Drive C Drive D

Type 1 is an IBM

1OMb

Fixed Disk Drive.

LEX41701

Memory Option Switch Settings

6160 PC XT with a

PC XT

Total Memory

576K

640K

Note

Note 2:

256Kb/640Kb

With

256/640

system board; Models 088, 089, 267, 268, 277, 278 only.

System Board (Note 1)

(Note 2)

The system board’s identifier is located on its left edge.

Memory adapters are not supported on 256/640K system boards.

System Board Switch Settings

LEX41702

Chapter 6. 5160 PC XT

6-5

Memory Option Switch Settings 5160 PC XT with a

32K option

- 64/256K

1 -

64/256K

option with 64K installed

option

64Kb/256Kb

system board.

288Kb Total Memory (32Kb + 256Kb on System Board)

64/256K

Option 64K Option

Card Switches Card Switches

320Kb Total Memory (64Kb + 256Kb on System

64/256K

Option 64K Option

Card Switches

Board)

Card Switches

32K Option

Card Switches

32K Option

Card Switches

LEX40241

2 - 32K options

LEX40242

352Kb Total Memo

(96Kb + 256Kb on

rstem Board)

1 -

64/256K

1 - 32K option

1 - 64K option 1 - 32K option

3 - 32K options

option with 64K installed

64/256K

Option

Card Switches

64K Option

Card Switches

32K Option

Card Switches

LEX40243

Chapter 6. 5160 PC XT

6-7

384Kb Total Memory (128Kb +

256Kb

on System Board)

1 -

64/256K

1 - 64K option

2 - 64K options

1 -

64/256K

2 - 32K options

1 - 64K option 2 - 32K options

option with 64K installed

64/256K

Option

Card Switches

64K Option

Card Switches

32K Option

Card Switches

1 -

64/256K

option with 128K installed

LEX40244

6-8

416Kb Total Memory (160Kb + 256Kb on System Board)

1 -

64/256K

1 - 64K option 1 - 32K option

2 7 64K options 1 - 32K option

1 -

64/256K

1 - 32K option

option with 64K installed

option with 128K installed

64/256K

Option

Card Switches

64K Option

Card Switches

32K Option

Card Switches

LEX40245

_/’

Chapter 6. 5160 PC XT

6-9

448Kb Total Memo:

(192Kb + 256Kb on System Board)

1 -

64/256K

- 64K option

1 -

64/256K

2 - 64K options

3 - 64K options

option with 192K installed

option with 128K installed

option with 64K installed

64/256K

Option

Card Switches

64K Option

Card Switches

32K Option

Card Switches

1 -

64/256K

32K options

1 -

64/256K

32K option

1 -

64/256K

64K option

1 - 32K option

option with 128K installed

option with 192K installed

option with 128K installed

LEX40246

480Kb Total Memory (224Kb + 256Kb on System Board)

LEX40247

6-10

‘L,’

1 -

64/256K

2 - 64K options

1 -

64/256K

1 - 64K option

1 -

64/256K

2 - 32K options

“1 -

64/256K

512Kb Total Memory

option with 128K installed

option with 192K installed

option with 256K installed

(256Kb + 256Kb on

“256K Option or

64/256K,O

Card Swttc

tion

Res

system Board)

64K Option

Card Switches

);ir81/

32K Option

Card Switches

* The switch setting for the 256Kb option is the same as that for the

544Kb Total Memory (288Kb + 256Kb on System Board)

“256K

Option or

64/256K

1 -

64/256K 1 - 64K option 1 - 32K option

“I - 64/256K

32K option

The switch setting for the 256Kb option is the same as that for the

option with 192K installed

option with 256K installed

=djiriBCijJ

Option

Card Switches

64Kb/256Kb

option with 256Kb installed.

64K Option

Card Switches Card Switches

option with 256Kb installed.

LEX40248

32K Option

LEX40249

Chapter 6. 5160 PC XT

6-11

1 -

64/256K

2 - 64K options

option with 192K installed

576Kb Total Memory (320Kb + 256Kb on System Board)

“256K

Option or

64/256K

Option

Card Switches

64K Option 32K Option

Card Switches Card Switches

‘I - 64/256K

1 -

64/256K

“1 -

1 - 64K option

“1 -

2 - 32K options

option with 256K installed

option with 64K installed

64/256K

option with 256K installed

* The switch setting for the 256Kb option is the same as that for the

64Kb/256Kb

LEX40250

option with 256Kb installed.

6-12

608Kb Total Memory (352Kb + 256Kb on System Board)

“256K Option or 64/256K

“1 - 64/256K

1 -

64/256K

1 - 32K option

‘1 -

64/256K

1 - 64K option 1 - 32K option

option with 256K installed

option with 64K installed

option with 256K installed

*lrbjJ

* The switch setting for the 256Kb option is the same as that for the

Option

Card Switches

64Kb/256Kb

64K Option

Card Switches Card Switches

32K Option

LEX40251

option with 256Kb installed.

640Kb Total Memory (384Kb + 256Kb on System Board)

*256K

Option or

64/256K

Option

Card Switches

64K Option

Card Switches

32K Option

Card Switches

L..---

“1 -

64/256K

- 64/256K

64K option

‘1 -

64/256K

64K options

“1 -

64/256K

- 64/256K

* The switch setting for the 256Kb option is the same as that for the

option with 256K installed

option with 64K installed

option with 256K installed

option with 128K installed

64Kb/256Kb

option with 256Kb installed.

Chapter 6. 5160 PC XT

6-13

Extender Card Switches

Set the switches on the extender card to reflect total system memory.

5160 DunsPlus System

System Memory

16K to 64K

96K to 128K

160K to 192K

224K to 256K

288K to 320K

352K to 384K

416K

to 448K

480K to

544K to 576K

608K to 640K

512K

Extender Card

Switch Block

LEX40253

LEX40109

Figure 6-9. 5160 DunsPlus System The DunsPlus* system consists of a unique 5160 IBM

Personal Computer XT (Model

788),

IBM 5153 Color Display, and an IBM 5152 Graphics Printer, or an optional NEC* letter-quality printer and its own unique software. It can be used for desktop computing as well as access to data bases on remote computers. The IBM customer engineer will install both the hardware and software for the DunsPlus system.

Note:Model 5160 XT/370 (20Mb) must have extender card switches set for 608Kb to 640Kb.

Figure 6-8. Extender Card Switch Settings

6-14

The

DunsPlus

XT built by IBM exclusively for the Dun

system is a specially designed IBM PC

Bradstreet Company. Maintenance is accomplished by IBM customer engineers using the DunsPlus Installation and

Service manual, the PC XT Hardware and Maintenance Service (HMS) manual, and the

DunsPlus

support center. Both installation and service are guided by the DunsPlus Installation and Service manual. The

DunsPlus

support center will screen both installation

and service calls. The IBM customer engineer will

supply

DunsPlus

with type and serial numbers on installations or element exchange incidents and major code on FRU replacement incidents. The feedback to DunsPlus DunsPlus

Call Reporting Procedure (guided by the

is accomplished via direct entry into the system Communications Link/Electronic

DunsPlus

Installation and Service manual).

* Registered Trademark

‘\\

Installation

Installation of a following the directions in the DunsPlus Installation and Service manual, which is included in the customer ship group. The IBM customer engineer will be required to install both the hardware and software for

DunsPlus

each must bring to each installation a copy of the PC XT HMS manual and the current advanced diagnostic diskette (Version 2.05 or later).

To install:

1. Unpack and assemble the system unit, including connection of the

2. Run system diagnostic tests, including the modem

loop-back test, to verify proper operation.

3. Format the fixed disk and install the

supplied software using the and Service Diskette.

4. Perform the Communications Link/Electronic Call

Reporting Procedure provided by

Any problems encountered while installing a system should be handled by calling the DunsPlus support center hotline. The telephone numbers for DunsPlus support will be supplied to the IBM service

representative via IBM dispatch.

Hardware Installation

Before starting any customer engineer should be familiar with the DunsPlus Installation and Service manual. This manual is part of the customer ship group and will be included in the first container to be opened (marked OPEN FIRST). After the initial installation, and after each service call, the servicer is required to do a communication link checkout. This is accomplished by following the procedure in the DunsPlus Installation and Service manual. The checkout procedure for the communication link is part of the DunsPlus software package. The prior to running the communication link checkout procedure.

DunsPlus

system. The IBM customer engineer

DunsPlus

system is accomplished by

DunsPlus

software must be installed

system cables.

DunsPlus

installation, the IBM

Installation

DunsPlus.

DunsPlus

Installation and Service

Manual

A copy of the DunsPlus Installation, and Service manual will be shipped with each system and an additional two copies will be shipped to each IBM BO servicing DunsPlus installations. The Installation and Service Diskette is included with the manual.

DunsPlus

Maintenance

The

DunsPlus

manner. IBM customer engineers will provide on-site

installation of the hardware and software, and on-site service of the hardware. The hardware is the same as other PC their own diagnostics and

Both installation and service will be directed by the DunsPlus Installation and Service manual in conjunction with the PC XT HMS manual. Some of the DunsPlus diagnostic diskette and some are installed on the fixed disk. The diagnostics installed on the fixed disk are maintained by are on the advanced diagnostic diskette can only be invoked after the diagnostic program senses it is being run on a

DunsPlus

A between a DunsPlus user and IBM customer engineer. The

DunsPlus tomer engineer with FRU/element exchange information when placing a service call. The IBM customer engineer will also be furnished with the dialing sequence to be used in testing the communication link and to report service call information at the completion of each service call.

The DunsPlus Installation and Service manual and its own special diskette will be shipped with each system as part of the shipping group.

system will be serviced in a unique

XTs,

except for two new adapters that have

PICs.

diagnostics are installed on the

DunsPlus.

DunsPlus

system.

support center will provide an interface

support center will provide the IBM cus-

The unique diagnostics that

advanced

DunsPlus

host

Service Cal Is

Software Installation

The IBM customer engineer will install the software from the customer-supplied diskettes onto the fixed disk in the DunsPlus system. This will be accom-

plished by first inserting the

Service Diskette, switching power on, and then following the prompts on the menu driven screens. The step-by-step instructions on installing the software are included in the DunsPlus Installation and

‘i,

Service manual.

DunsPlus

Installation and

DunsPlus

Service calls are placed via support, which screens the calls prior to notifying IBM. Installations are handled in the same manner. Using this technique, not only minimize installation problems but also reduce unnecessary service calls. Whenever possible, the IBM customer engineer will be asked to bring a particular FRU to a service call (again minimizing outage).

DunsPlus

Chapter 6. 5160 PC XT

customer

customer support will

6-15

Electronic Call Reporting

The IBM customer engineer will supply the DunsPlus support center (via direct entry into the DunsPlus system) the following information:

Installation and Service manual. The adapter is easily identified by the two modular telephone jacks on the rear of the adapter. The telephone plugs into the bottom receptacle and the wall connector plugs into the top receptacle.

l Machine type and serial for repairs, element

exchange, and installations

Major code for FRU replacement incidents.

Internal IBM incident reporting will remain the same.

DunsPlus

Hardware

Two new pieces of hardware and a specific hardware rule are part of the

The Internal Modem Adapter is a microprocessor-

DunsPlus

system:

based modem that operates at 300 or 1200 bps and provides auto-dial and auto-answer capabilities.

. The Printer/Register Adapter is like the Parallel

Printer Adapter with special register for

DunsPlus system security. It is not interchangeable with a Parallel Printer Adapter.

Internal Modem Adapter

Printer/Register Adapter

LEX40110

Figure 6-11. Printer/Register Adapter

The Printer/Register Adapter is included in the DunsPlus system. It contains the normal Parallel Printer Adapter as well as an DunsPlus

system for security. This 8-bit register

8-bit

stores the users’ identification, which allows them

access to the

DunsPlus

network. The part number for

the Printer/Register Adapter is included in the

DunsPlus Installation

and Service manual.

Printers

LEX40044

Figure 6-10. Internal Modem Adapter The Internal Modem Adapter contains auto-call logic

that is used by the customer to establish a connection with the host system. The

DunsPlus

documentation may refer to autocall as Dialer or Auto-Dialer. The Internal Modem Adapter functions as an alternate Asynchronous Communications Adapter with a built-in modem. The advanced diagnostic tests identify this adapter as Alt Async Communications Adpt on the Installed Devices screen. When the advanced diagnostics have finished testing the adapter, they will direct the IBM customer engineer to the DunsPlus Installa- tion and Service manual to complete the communication link test. The part number for the Internal Modem Adapter will be included in the DunsPlus

Two printers are available for the

l The standard IBM 80 CPS Graphics Printer (5152) l The NEC Model 3550 Letter-Quality Printer,

DunsPlus

system:

which is a FRU.

Both printers are serviced on an exchange basis through IBM Service.

LEX40111

Figure 6-12. IBM 5152 Printer

ij,

6-16

Figure 6-13. NEC 3550 Printer

FRU Locations

5160 XT/370

Diskette Drive

LEX40112

Fixed Disk Drive

Keyboard

The FRU locations on the PC XT board are fixed. They are shown in Figure 6-14 and are as follows:

Position 1 Position 2 Position 3

Position 4

Position 5

Position 6 Position 7 Position

Color/Graphics Monitor Adapter Open Open Internal Modem Adapter Fixed Disk Adapter Diskette Drive Adapter Printer/Register Adapter Asynchronous Communications Adapter.

LEX40113

Figure 6-14. PC XT Board FRU Locations

LEX40128

Figure 6-15. 5160 XT/370 The XT/370 is an extended version of the 5160 XT with

256Kb of memory on the system board. The system unit has two XT/370 Adapter cards plugged into the system board:

l The Processor card

The 512Kb Memory card

(PC/370-P)

(PC/370-M)

in expansion slot 4

in expansion

slot 3.

Options available include:

l A Remote Display Terminal Device Emulation

Adapter card

l IBM

3278/79

Emulation Adapter.

Note: A Remote Display Terminal Device Emulation Adapter card can be in expansion slot 2.

10Mb

The XT/370 can be used as a

system (one fixed disk drive in the system unit) or a 20Mb system (two fixed disk drives in an expansion unit).

Note: Older models of the PC XT/370 might contain a PC/3277EM

card. (This option provides 3277-2 emulation when the PC XT/370 is attached to a host system.)

Chapter 6. 5160 PC XT

6-17

Unit Specifications

System Unit Size

Height Length Depth Weight

Power Cable

Length Size

Environment

Air Temperature

System On

System Off

Humidity

System On

System Off Heat Output Noise Level

Electrical

Nominal Minimum Maximum

142 mm (5.5 in) 500 mm (19.6 in) 410 mm (16.1 in)

14.5 kg (32 lb)

1.83 m (6 ft) 18 AWG

15.6” to (60” to 90°F) 10” to 42°C (50” to

8% to 80% 20% to 80%

650

49.5 dBa System unit with monochrome display and expansion unit attached.

120V AC 104V 127V

32.2”C

ll.O”F)

BTU/hr

AC AC

PC/3277EM

Figure 6-17.

Card

PC3277EM

LEX40129

Card (Used in PC XT/370

only)

The

PC/3277EM

card allows the PC XT/370 to emulate a 3277-2 terminal when the PC XT/370 is linked to a host system. This card also allows additional functions to those of the 3277 when supported with suitable software. These additional functions include the ability to print single screens, complete listings, or other files on the PC XT printer, and the ability to transfer data between the PC XT/370 and the host system disks.

Keyboard Size

Height Length Depth Weight

Figure 6-16. 5160 XT/370 Specifications

57 mm (2.2 in) 500 mm (19.6 in) 200 mm (7.87 in)

2.9 kg (6.5 lb)

PC/370-P

Figure 6-18.

PC/370-P

The for the PC

Card

LEX40130

PC/370-P

card is the center of the S/370 operations

XT/370.

The

Card

PC/370-P

card contains the microprocessors and control circuits that enable the PC XT/370 to execute S/370 instructions.

6-18

PC/370-M

Card

LEX40131

Figure 6-19. The

PC/370-M random access memory (RAM), which can be used by either the vides 512Kb of memory for use in S/370 mode, total of 640Kb of memory for use in PC XT mode.

PC/370-M

card contains

PC/370-P

card or by the PC XT. This pro-

Card

512Kb

of parity-checked,

or a

Chapter 6. 5160 PC XT

6-19

Chapter 7. 5161 Expansion

Unit

tains a power supply, an expansion board, and a Receiver card. This option utilizes one expansion slot in the system unit to provide seven additional expansion slots in the expansion unit.

Unit Specifications

1 OMb Fixed Disk Drive

Figure 7-1. 5161 Expansion Unit

Expansion Board

Option Adapt&

Receiver Card

Slot for Fixed

Disk D Drive C

Power Supply (130 Watt)

Fixed Disk

LEX40079

Size

Height Length Depth

Weight

Power Cable

Length Size

Signal Cable

Length Size

Environment

Air Temperature System On

System Off Humidity

System On System Off

Heat Output

Noise Level

142

(5.5

500

410

14.9

1.83 m (6 ft) 18

AWG

1 m (3.28 ft) 22

AWG

15.6” to 32.2”C (60” to 90°F) 10” to 43°C (50” to

8% to 80% 20% to 80%

750

BTU/hr

49.5

Expansion

in)

(19.6 (16.1

(33

lb)

110°F)

dBa

unit attached

in) in)

to system unit with monochrome display

‘i/

LEX40080

Figure

7-2.5161

Expansion

Unit(Cover

Removed)

Note:This unit is not supported on 5160 Models 088, 089, 267,

268,277,

and 278.

The 5161 Expansion Unit provides additional configuration flexibility for the 5150 Personal Computer and the 5160 Personal Computer XT. Each expansion unit

10Mb

contains a

fixed disk drive

extension card slots. One additional

and

eight option

1OMb

fixed disk drive may be installed for a total of 20Mb of fixed disk storage. The power supply used in the expansion unit is a PC XT

130-watt

power supply.

The IBM Expansion Unit option enhances the system unit by adding

expansion slots in a separate unit. This option consists of an Extender card, expansion unit cable, and the expansion unit. The expansion unit con-

Electrical

Nominal Minimum Maximum kva

Figure

_.^_I

I-Y. 5161 Specifications

Chapter 7. 5161 Expansion Unit

120V AC 104V

127V

0.41 max.

.“.

7-l

Expansion Board

Expansion Unit Expansion Slots

J2 J3 J4 J5 J6 J7 JB

The expansion unit cable consists of a shielded cable terminated on each end with a 62-pin

Expansion Bdard Power

ConnTctors

D-shell male connector. Either end of the expansion unit cable can be plugged into the extender card or the receiver card.

56-wire,

foil-

Extender Card Switch Settings

The following chart shows the switch settings of the extender card switch block in conjunction with memory of various sizes. The adapter is found inside the system unit, not in the 5161 Expansion Unit.

LEX40081

Figure 7-4. 5161 Expansion Board The expansion board is a support board that carries

the I/O channel signals from the option adapters and Receiver card.

Decoupling capacitors provided on the expansion board aid in noise filtering.

Using Expansion Slot 8

Any card placed in expansion slot 8 is expected to respond with a card select signal. Only one IBM Card provides this signal, the Asynchronous Communications Adapter. In order to provide this signal,

J13

jumper not providing this signal will not be recognized.,

must be installed on the card. Any card

Svstem

M’emory

1 160K to

192K

224K to 256K

288K to 320K

416K to 448K

480K to 512K

Extender Card

Switch Block

608K to 640K

Figure 7-6. Extender Card Switch

Memorv

Segment

LEX40194

Settings

Expansion Unit Cable

Figure 7-5. Expansion Unit Cable

7-2

LEX40082

Extender Card, P/N6323445

LEX40083

Figure 7-7. Extender Card (Right View) The Extender card is a four-plane card. It redrives the

I/O channel to provide sufficient power to avoid capacitive effects of the cable. The Extender card presents only one load per line of the I/O channel.

The Extender card has a wait-state generator that inserts a wait state on memory-read and memory-write operations (except refreshing) for all memory contained in the expansion unit. The address range for wait-state generation is controlled by switch settings on the Extender card.

Receiver Card, P/N8529251

LEX40084

Figure 7-8. Receiver Card (Right View) The Receiver card is a four-plane card that fits in

expansion slot 8 of the expansion unit. It redrives the I/O channel to provide sufficient power for additional options and to avoid capacitive effects. Directional control logic is contained on the Receiver card to resolve contention and direct data flow on the I/O channel. Steering signals are transmitted back through the expansion unit cable for use on the Extender card.

The dual in-line package (DIP) switch on the Extender card should be set to indicate the maximum contiguous read/write memory in the system unit.

Chapter 7. 5161 Expansion Unit

7-3

Chapter 8. 5162 PC XT Model 286

46 dBa System Unit without display or printer attached

115V

9OV

137V

230V AC

180V

265V AC

6.0V

amp/hr

UL Approved

capacity

LEX42627

Figure 8-1. 5162 PC XT The IBM Personal Computer XT Model 286 is an

enhancement of the Personal Computer XT family. A

Noise Level

Electrical Range 1 (57-63 Hz)

Nominal Minimum Maximum

Range 2 (47-53 Hz)

Nominal

Minimum

Maximum

Lithium Battery

Figure 8-2 (Part 2 of 2). 5162 Specifications

standard configuration includes an Intel 80286 6 MHz Microprocessor with zero wait-state, 640Kb of memory, one diskette drive, and one fixed disk. Extensive

special features and software are available which

provide compatibility with the rest of the IBM PC

family.

5162 PC XT Standard Features

The following are standard features of the 5162 Model

286:

Power supply

- 157-watt

Unit Specifications

System Unit Size

Height

Length Depth

Weight

Power

Cable

Length

Environment

Air Temperature System On

System Off Humidity

System On System Off

142 mm (5.5 in) 500 mm (19.6 in) 410 mm (16.1 in)

12.7 kg (28 lb)

1.8 m (6 ft)

15.6” to

32.2”C

(60” to 90°F) 10” to 43°C

(50”

to 110°F)

8% to 80% 20% to 80%

Internally switched to support

115V

230V AC.

System board

80286 Microprocessor

6 MHz Clock

8 Expansion Slots

5 with a 36-pin and

3 with only the 62-pin card edge socket.

640Kb base random access memory (RAM)

Complementary metal oxide semiconductor

62-pin

card edge socket

(CMOS) RAM to maintain the system setup configuration

Battery to keep CMOS active when power is off.

Speaker

Half-high

1.2Mb

diskette drive

20Mb fixed disk drive

101/102-key

keyboard.

AC or

Heat Output

824 BTU/hr max.

Chapter 8. 5162 PC XT Model 286

8-1

Incompatible Adapters

System Differences

Certain option adapters are not compatible when used in the same system.

The following adapters should not be installed together in the 5162 System Unit:

. Synchronous Data Link Control (SDLC)

l Alternate Binary Synchronous Communicatons

(Alt. BSC).

Problems might occur in the system because of adapters that share the same interrupt level. Check the adapter interrupt levels to be sure that they do not

conflict. If the adapters have selectable interrupt

levels, be sure their jumpers are not set for the same

level. Some options not supported by the IBM Personal Com-

puter XT Model are:

Expansion Unit

AT 128Kb Memory Expansion

AT 512Kb Memory Expansion

128Kb/640Kb

AT Fixed Disk and Diskette Drive Adapter

256Kb Memory Expansion

64Kb/256Kb

64Kb Memory Module Kit

Full-high diskette drives

AT 30Mb Fixed Disk Drive

AT 20Mb Fixed Disk Drive

10Mb

. . . . . .

fixed disk drive AT Prototype card Diskette Drive Adapter Fixed Disk Adapter 8087 Math Coprocessor Professional Graphics Adapter and Display

Game Control Adapter Color printer Other keyboards.

Memory Expansion

This section shows the differences between the PC XT 5162 and the rest of the PC family.

LEX42454

Figure 8-3. 5162 System Unit (Left Side View, Cover

Removed)

LEX42651

Figure 8-4. 5162 System Unit Memory Modules

Asm - Index

2-l

-2

-3

-NS

-4

-5

-6

-7

Description

System Board 256Kb Memory Module Package

4 Memory Module

64Kb Parity Module, System Board Battery Holder Power Supply Speaker Assembly

Base Frame Assembly

(

8-2

System Board

The 640Kb System Board uses two 256Kb memory module packages and a 128Kb memory blank consisting of two parity modules and four 64Kb memory modules.

Mej;nory

Rear ,Panel

Module Packages

x 4

80286 Processor

,Power

80‘287

Math Coprocessor

Supply

Connector 128Kb

Memory

Display

LEX42455

Figure 8-5. 5162 System Board

Keyboard

The 5162 PC XT Keyboard is a This keyboard has a serial interface and attaches to a 5-pin connector in the back of the 5162 via a 9-foot coiled cable.

101/102-key

keyboard.

Cabling

SDL Connector 1 Signal Name

ISignal

Type

LEX42456’

Figure 8-6. 5162 Keyboard Connectors

Serial/Parallel Adapter

One Serial/Parallel Adapter is standard in the 5162. This adapter provides one serial port and one parallel port.

20Mb

The fixed disk drive used in the 5162 PC XT can store up to 20Mb of data. Reading from and writing to this drive is initiated in the same way as the other models of PC XT; however, the 5162 PC XT Fixed Disk and Diskette Drive Adapter may be addressed from dif-

ferent BIOS locations.

Fixed Disk Drive

The keyboard cable connects to the system with a

5-pin DIN connector and to the keyboard with a six-position SDL connector. The following table shows the pin configuration and signal assignments.

High-Capacity Diskette Drive

One

5.25-inch to the standard high-capacity diskette drive can be installed in a 5162 to provide an online diskette capacity of Disk and Diskette Drive Adapter.

The second high-capacity diskette drive has the same characteristics as the standard high-capacity diskette drive.

The second high-capacity diskette drive is installed below the standard high-capacity diskette drive in the 5162 and addressed as drive B. It is mutually exclusive with the internal diskette drive, and the 4865 Model 002 External

high-capacity diskette drive in addition

2.4Mb.

The two drives attach to the Fixed

5.25-inch

3.5-inch

360Kb diskette drive,

Diskette Drive.

3.5-inch

Chapter 8. 5162 PC XT Model 286 8-3

The high-capacity diskette drive uses a different

5.25inch diskette from that used in the IBM PC config-

urations with the 8088 Microprocessor to achieve a

1.2Mb

capacity. This drive can also read from both

sides of a double-sided,

320Kb/360Kb-capacity,

5.25inch diskette or from one side of a single-sided, 160Kb/180Kb-capacity,

5.25-inch

these diskettes have been written on by a

diskette. However, if

high-

capacity diskette drive they might not be readable. Note:Diskettes designed for use in this drive cannot

be used in either a diskette drive in the

160Kb/180Kb

1.2Mb

mode.

320Kb/360Kb

5.25-Inch 360Kb Diskette Drive

One

5.25-inch a 5162 System Unit in addition to the standard capacity diskette drive. It attaches to the Fixed Disk and Diskette Drive Adapter and is offered to read and write

5.25-inch

Personal Computer configurations that do not have a

5.25inch

This diskette drive can read and write single-sided

(160Kb/180Kb capacity), double-density, soft-sectored, diskettes. This drive is required in the 5162 to maintain diskette portability only if writing is to be done to single- and/or double-sided diskettes that are also used in IBM Personal Computer configurations without a

5.25-inch can be read-only using the high-capacity diskette drive.

360Kb diskette drive can be installed in

high-

diskettes that are to be used in IBM

(1.2Mb)

high-capacity diskette drive.

capacity) and double-sided

(320Kb/360Kb

5.25-inch

high-capacity diskette drive. Such diskettes

Fixed Disk and Diskette Drive

Adapter

One Fixed Disk and Diskette Drive Adapter is present in slot 6 and is the only Fixed Disk and Diskette Drive Adapter that can be installed in a 5162 configuration.

Up to three drives, two diskette drives, and one fixed disk drive can be attached to this adapter. The two attached diskette drives can be:

l Two l One high-capacity diskette drive and one

5.25-inch

high-capacity diskette drives

5.25-inch

360Kb diskette drive

l One high-capacity diskette drive and one

diskette drive 4865 Personal Computer

(3.5-inch

internal diskette drive or

3.5-Inch

External Diskette

3.5-inch

Drive Model 002).

The External Diskette Drive Adapter provided with

the 4865 Model 002 External

3.5-Inch

Diskette Drive also attaches to the Fixed Disk and Diskette Drive Adapter.

Power Supply

The system power supply located inside the system unit provides power for the system board, the adapters,

the diskettes drives, the fixed disk drive, the keyboard, and the IBM Monochrome Display.

Inputs

‘L

3.5-Inch Internal Diskette Drive

One 3.5inch internal diskette drive with a 720Kb capacity can be installed in a 5162 unit to provide approximately 2Mb of online diskette storage when a second

5.25-inch

5.25-inch 360Kb diskette drive, or the 4865 Model 002

External

3.5inch drive is a half-height drive that is installed below the standard high-capacity diskette drive. It attaches to the Fixed Disk and Diskette Drive Adapter and is addressed as B.

This

3.5-inch

doubled-sided, high-capacity (2 HC) diskette and is housed in a rigid plastic case that contains a built-in write-protect switch. The plastic cases have an integrated protection mechanism (a metal, loaded slide cover) for the area of the diskette that will be accessed by the read/write heads of the diskette drive. DOS Version 3.2 is required to use a diskette drive.

high-capacity diskette drive, the

3.5-inch

Diskette Drive is not installed. This

diskette drive reads and writes the

spring-

3.5-inch

The power supply can operate at 220/240V 50 input voltages of

AC,

2.3A

at frequencies of either 60

-1-3

Hz. The power supply automatically adjusts to

110V

AC or 220V AC. The following

110V

AC,

4.6A

$-3

Hz or

figure shows the input requirements.

Range

115V

230V AC

Voltage (V AC) 1 Current (Amps)

Minimum 90

Maximum 4.6

Maximum 137 Minimum 180

Maximum 2.3

Maximum 265

Figure 8-7. 5170 Input Requirements

outputs

The power supply provides + 5, -5, + 12, and -12V DC. The following figure shows the load current and regulation tolerance for these voltages. The power to the IBM Monochrome Display is controlled by the power

supply.

8-4

Warning: The voltage provided to the monochrome

display from the power supply is the same as the input

line voltage to the power supply. Ensure that the

monochrome display is the correct model for the input

line voltage.

500 milliseconds and is capable of sourcing 2 milliamperes and sinking 10 milliamperes.

The following figure shows the minimum sense levels for the output voltages.

‘\L

i.__/

Figure 8-8. 5162 DC Load Requirements

DC Output Protection

An overcurrent condition will not damage the power

SUPPlY.

Output Voltage Sequencing

Under normal conditions, the output voltage levels track within 50 milliseconds of each other when power is applied to or removed from the power supply, provided at least minimum loading is present.

No-Load Operation

No damage or hazardous conditions occur when primary power is applied with no load on any output level. In such cases, the power supply may switch off, and a power-on reset will be required. The power supply requires a minimum load for proper operation.

Power-Good Signal

The power supply provides a power-good signal to indicate proper operation of the power supply.

When the supply is switched off for a minimum of 1 second and then switched on, the power-good signal is generated, assuming there are no problems. This signal is a logical AND of the DC output-voltage sense signal and the AC input-voltage sense signal. The power-good signal is also a TTL-compatible high level for normal operation and a low level for fault conditions. The AC fail signal causes power-good to go to a low level at least 1 millisecond before any output voltage falls below the regulation limits. The oper-

ating point used as a reference for measuring the 1 millisecond is normal operation at minimum line voltage and maximum load.

The DC output-voltage sense signal holds the power-

good signal at a low level when power is switched on until all output voltages have reached their minimum sense levels. The power-good signal has a turn-on delay of at least 100 milliseconds but not longer than

Figure 8-9. 5162 Sense Levels

Connectors

The following figure shows the pin assignments for the power-supply output connectors.

Load Point

P8-1 P8-2 P8-3 P8-4 P8-5

P8-6 P9-1

P9-2 P9-3

P9-4 P9-5 P9-6

P10-1 P10-2 P10-3 P10-4

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

* See Power-Good Signal

Voltage (V DC) Power Good*

+5 + 12

-12 Ground Ground

Ground Ground

-5 +5 +5

-I-

+12 Ground Ground

1-5

Figure 8-10. 5162 Power Supply Output Connectors

Battery

The 5162 battery is a which is attached to the battery connector at the back of the system board.

The 5162 battery is considered a FRU part, P/N72X8498,

which carries the one-year warranty of the 5162 system unit. The battery FRU part carries the normal

go-day

6-volt,

life-long lithium battery,

parts warranty.

Chapter 8. 5162 PC XT Model 286

8-5

When replacement of the battery is required, follow the directions below:

l Power off the system.

l From the rear of the system unit, remove the

screw in the battery holder door.

l Replace the battery using caution to insert the

battery in the correct position with the battery terminals facing into the system unit.

Note:5162 System Units are shipped with the battery in the reserve position to prolong life expectancy of the battery.

Disregard the battery replacement instructions and part number provided in the 5162 Guide to Operations manual, Section 3.

system. Two classifications of malfunctions that can be detected during the POST are critical and noncritical.

Critical malfunctions prevent the system from operating, at all or could cause incorrect results that are apparent to the user.

Non-critical malfunctions are those that cause incorrect results that might not be apparent to the user.

If a critical error is detected during the POST, an attempt is made to indicate the error and all testing will halt. On a non-critical error, an error code is displayed and the testing is stopped. Testing can be con-

tinued on a non-critical error by pressing the After a successful POST, in which no critical errors

are detected, a single short beep will be generated.

Control is then given to the system boot strap loader.

It is important to remember that the POST does not test all areas, but only those that allow the system to be operational enough to run the advanced diagnostics program.

key.

LEX42457

Figure 8-11. 5162 Battery Location

5162 PC XT/286

Diagnostic/Switch Setting

Information

Error Codes

You might have an error code or an audio response during power-on self test (POST). If you have both an error code and an audio error, disregard the audio error and perform advanced diagnostics on the FRU indicated.

Power-On Self Test

5162 PC XT/286 Diagnostics

For a Symptom-to-FRU Index and additional diagnostic information, refer to the Service Summary Cards supplied with this manual.

Memory Switch Settings

The switches on the memory options are divided into two sections:

l Switches 1-5 determine the starting address for the

expansion memory installed on the option.

l Switches 6, 7, and 8 are not used on the

512Kb/2Mb Memory Expansion option.

Starting Address (Switches 1

through 5)

The switch settings can be determined through the fol-

3.5Mb

lowing procedure. Assume you have sion memory installed in your system and you are

installing another memory option.

of expan-

The POST is initiated automatically with each power on of the system. The POST can be invoked at any time by pressing the Ctrl key, the Alt key, and the Del key at the same time, then releasing them.

The POST is a series of system checks and initialization that verifies the correct operation of the base

8-6

1. Establish your starting address by adding the amount of expansion memory already installed

(3.5Mb) to the starting address for expansion

memory.

3.5M

(Amount of expansion memory installed)

-I

.OM

(Starting address for expansion memory)

4.5M

(Starting address for next option)

LEX42507

2. In the following table, find the values that, when

added, equal

4.5Mb.

LEX42509

‘k_J

4.0M (Switch 2 set to Off Position)

M(Switch 5 set to Off Position)

4.5M

(Switch Setting for new option)

LEX42508

Figure 8-12. Memory Switch Settings

Memory Module Package

1. Power off the system.

2. Remove the system unit cover.

3. Find the failing memory module package on the system board (MAP 0200: Memory, in the

manual).

4. Grasp the memory module packages and lift them

from the system board.

Note: Some memory module packages are held in place by two retention tabs. The rear memory module package must be removed first. Gently spread the two

tabs apart while lifting at a slight angle on the

memory module package.

HlMS

Figure

8-13.

Memory Module Package

5162 PC XT/286 Switch Setting Information

For further information on Memory Expansion

Adapter switch settings, refer to Chapter

17.

Chapter 8. 5162 PC XT Model 286 8-7

IBM AT (TYPE 5170, TYPE 2/3), PC (TYPE 5150) 16-64KB (1817030 XM 474,1503388 536 XM,1817030 XM 366,1802453,1802461), PC (TYPE 5150) 64-256KB (6137403,1501480 XM 557), AT (TYPE 5170, TYPE 1) (6133920), XT (TYPE 5160) 64-256KB (6323560, 6323362, 6181655) IBM 5150-60-70 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual