Ibm 3274 51c Setup guide

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Maintenance

Library

Control Unit

Models

51C

and 52C

Maintenance Information °

SY27-2513-4

Contents

Chapter

1.

Introduction

1-1

1.1 General .

1-1

1.2 Maintenance Approach

1-1

1.3 Field Replaceable

Unit

(FRU)

Locations 1-2

1.3.1 Machine Model

Number

1-2

1.3.2

0IA-Al

Logic Board 1-2

1.3.3 Card Numbers 1-2

1.3.4

Operator

Panel 1-2

1.3.4.1 IML Options 1-2

1.3.4.2 Indicators (8 4 2

1)

1-3

Chapter

2. Subsystem Problem Isolation Procedure

2-1

Step 1 Using the Isolation Procedure

2-1

Step 2 Power Test

2-1

Step

3 Bus Test

2-1

Step 4 Internal Tests 2-3

Step 5 Device Adapters -Driver/Receiver 2-8

Step 6 Display Symbols (Category A Only) 2-12

Step

7 Operational Indicators

(84

2

1)

2-14

Step 8 Host

Attachment

2-15

Step 9 Voltage Checks 2-15

Step 10 Verification Test 2-15

Step

11

Last

Option

2-15

Chapter

3.

Maintenance Analysis Procedures (MAPs) 3-1

3-1

General 3-1

3.2 Contents

3-1

MAP

AI0,

Bus Test 3-2

MAP

A20,

Control

Logic Failure

3-7

MAP

A40, Diskette Failure 3-11

MAP

A50,

Type

A Adapter Failure Code 3-17

MAP

A90, Device Adapter

Type

B 3-20

MAP

A100, Machine

Checkout

3-22

MAP

A120, Power Problem, Indicator On

or

Off

3-24

MAP

A122, Power On Indicator

is

Off

and Fan Not

Turning 3- 36

MAP

Al30,

I.M.

2400,4800,9600

Failure 3-42

MAP AlSO, Installation/Customization Problems 3-47

Chapter

4.

Removal

and

Replacement Procedures 4-1

4.1 Machine Access -Cover Removal/CE Manuals 4-2

4.2

Machine Access -Board/TSR Supply 4-3

4.3 Card Removal and Replacement 4-4

4.4 Internal Cable/Connector, Removal and Replacement 4-4

4.5 Prime Power Box, Removal and Replacement 4-5

4.6 Prime Power Transformer, Removal and Replacement 4-6

4.7 Fan Assembly, Removal and Replacement 4-7

4.8. Diode Assembly, Removal and Replacement 4-8

4.9 Input Filter Capacitor, Removal and Replacement 4-9

4.10

TSR Power Supply, Removal and Replacement 4-10

4.11 I/O Panel -Driver/Receiver, Removal and

Replacement 4-11

4.12

Diskette Drive, Removal and Replacement 4-12

4.13 Line Plate Card, Removal and Replacement 4-13

4.14

Operator

Panel/Indicator Card, Removal and

Replacement 4-14

4.15 Logic Board, Removal and Replacement 4-15

4.16

Operator

Panel Switches, Removal and Replacement 4-16

Chapter

S. Communications Reference Data

5-1

5.1 Communications Facilities

5-1

5:1.1

3274

Models

SIC

and

52C

SDLC

5-1

5.1.2

3274

Model

SIC

BSC 5-1

5.1.3

3274

Models

SIC

and

52C

Modes/Speeds

5-1

5.1.4

Communication

Adapters 5-1

5,2 Communications

Attachments

5-1

5.2.1 External Modem EIA/V.35

5-1

5.2.2 Integrated Modem

(1200

bps) 5-1

5.2.3 Integrated Modem

(1200

bps) Wrap 5-4

5.2.4 Integrated Modems

(2400,

4800,

and

9600

bps),

Model51C

5-4

5.2.5 DDS

Adapter

5-4

5.2.6

Loop

5-4

5.2.7 X.21 Nonswitched 5-4

5.2.8 X.21 Switched 5-4

5.3 Wrap Test 5-13

5.3.1 Modem Wrap Test 5-13

5.3.2

Wrap Test

without

Attached

Modem (X.21 and EIA

or

V.35

without

Clock) 5-13

5.3.3 Loop Wrap

Test

5-14

5.3.4

Loop

Indicators 5-14

5.4

2400-,4800-,

and 9600-bps Integrated Modems 5-14

5.4.1 2400-bps Integrated Modem

(Feature

Code 5640) 5-14

5.4.2 4800-bps Integrated Modem (Feature Code

5740)

5-14

5.4.3 9600-bps Integrated Modem

(Feature

Codes

5480

and

5842)

5-14

5.4.4 Line

Attachments

5-14

5.4.4.1 Multipoint Network Operating Speed 5-14

5.4.4.2 Point-to-Point Network Operating Speed 5-14

5.4.4.3 Signal Quality 5-18

5.4.4.4 Speed

Control

Backup 5-18

5.4.4.5 Operate Indicator 5-18

5.4.5

2400-,4800-,

9600-bps Integrated Modem

Diagnostics 5-18

5.4.5.1 Self-Test/Wrap Test 5-18

5.4.5.2 Integrated Modem Failure 5-18

5.4.5.3 ALT2 Self-Test 5-18

5.4.5.4 ALT2/IML Modem Wrap Test 5-22

5.4.5.5 Test Alarm Card (TAC) Extended Diagnostic 5-22

5.4.5.6 Procedure

to

Follow

if

IML Test 0111

is

Flashing 5-22

5.4.6 Transmit Level Adjustment 5-22

5.4.6.1 U.S. and Canada 5-22

5.4.6.2

Other

Countries 5-22

5.4.7

Front

End Card Replacement and Adjustment 5-22

5.4.8 Test Alarm Card (T

AC)

Transmit

Tone

Adjustment 5-24

5.4.9 Board Wiring

Options

5-25

5.4.9.1 Teleprocessing

Attachment

(Point-to-Point

and

Multipoint) 5-25

5.4.9~2

Clear-to-Send Delay (Normally Not Adjusted) 5-25

5.4.9.3 Carrier Detect Sensitivity (Normally Not

Adjusted) 5-25

5.5.9.4

Continuous/Noncontinuous

Carrier (Normally

Not Adjusted) 5-25

5.4.10

Card Wiring

Options

5-25

5.4.10.1 Transmission Pre-Emphasis for 2400-bps (Normally

Not Adjusted) 5-25

5.4.11

2400-,4800-,

and 9600-bps Integrated Modem

Reference

Information

5-25

5.5

3274

System

Grounding

5-25

5.6 Link Problem Determination Aid (LPDA) 5-29

5.7 Modem Address Switches 5-29

1

5.8

3290

Address Configuration 5-31

5.8.1 Configuration

Support

T 5-32

5.8.2 Configuration

Support

D 5-32

Contents

ix

Chapter

6.

3274 Encrypt/Decrypt Feature

6.1 FeatureDescription

6-1

6.1.1 IML Display

Indications'

6-1

6.1.2 Feature Components

6-1

6.1.3 Encrypt/Decrypt Failures 6-1

6.2

Battery Power Supply Check 6-1

6.3 Procedure for Encrypt/Decrypt Battery

Replacement 6-2

6.4 Entering the Terminal Master Key 6-3

6.5 Verifying the Terminal Master Key 6-4

6.6 Encrypt/Decrypt Feature Test

6-5

I

Chapter 7. Response Time Monitor

7.1 Feature Description

7-1

7.2 Microcode Support

7-1

7.3 IML Testing

7-1

Appendix A. Locations A-I

Appendix B.' Power Supplies

B-1

7-1

6-1

Appendix C. Connector, Board, and Card Locations

C-1

Appendix D. Operator and Control Panels 0-1

0.1

3274 Models

SIC

and 52C Operator Panel 0-1

0.1.1

Indicators8421

0-1

0.1.2

Loop Attachment Indicators 0-1

0.1.3

Switched Line Operate Switch/Call In

Progress Indicator 0-1

0.1.4

2400-,4800-, and 9600-bps Integrated Modem

Indicators 0-1

0.2

IML Options 0-1

0.2.1

Normal 0-1

0.2.2

ALT 1

0-2

x

D.2.3 ALT 2

0-2

0.2.4

ALT 2 (2400-, 4800-, and 9600-bps Integrated

Modem)

0-2

D.3 Loop and Modem Control Panels

0-2

0.3.1

Loop Attachment Control Panel

0-2

0.3.2

1200-bps Integrated Modem Control Panel

0-2

0.3.3

1200-bps Transmit Level Attenuation Switch Adjustment

Procedure (U.S. and Canada Only)

0-2

Appendix E. 31SD Diskette Drive Maintenance E-l

E.l

Introduction

E-3

E.2 Device Theory

of

Operation E-13

E.3 Maintenance E-22

Appendix

F.

5 lTD Diskette Drive Maintenance

F-1

F.l

Introduction F-2

F.2 Device Theory

of

Operation F-13

F.3 Maintenance F-22

Appendix G. Glossary G-l

Appendix P. 3274 Models

SIC

and 52C Parts Catalog pol

Figures

1-1.

1-2.

1-3.

14.

1-5.

1-6.

1-7.

1-8.

2-t.

2-2.

2-3.

24.

2-5.

2-6.

2-7.

2-8.

2-9.

2-10.

2-11.

2-12.

4-1.

4-2.

4-3.

44.

4-5.

4-6.

4-7.

4-8.

4-9.

4-10.

14-1

1.

4-12.

4-13.

4-14.

4-15.

5-1.

5-2.

5-3.

54.

5-5.

5-6.

5-7.

5-8.

5-9.

5-10.

5-11.

5-12.

Maintenance Approach

1-1

3274 Models 51C/52C Locations 1-4

01A-A1 Board -Model

SIC

(with/without Category B

Devices)

1-5

01A-A1 Board -

Model52C

(Kanji/Chinese) 1-5

01A-Al Board -Model

SIC

without

2400-, 4800-,

and 9600-bps Integrated Modem 1-6

0IA-Al

Board -Mode151C with

2400-,4800-,

and

9600

bps Integrated Modem 1-6

Card Location Chart 1-7

3274 Models 51C/52C Basic Operator Controls 1-8

3274 Problem

Report

Form,

Sample 2-2

3274 Hardware Block Diagram (Models

SIC

and

52C),

24

Failure Code to Card or MAP

Entry

2-5

Control St,orage Error Codes/Card Locations 2-6

Control Storage Card Layouts 2-7

Coaxial Cable (Driver-Receiver)

DC

Resistance 2-9

Translation Table for /B Test Address 2-11

Port Address Table

without

3290 Displays (Model 51C) 2-11

Port Address Table with 3290 Displays (Model

SIC)

2-11

Display Symbol Indications 2-13

Operational Indicators 2-14

Symptom

Repair List 2-15

Machine Access, Cover 4-2

Machine Access, Board/TSR Supply 4-3

Card Connector

44

Prime Power Box 4-5

Prime Power Transformer 4-6

Fan Assembly 4-7

Prime Power Diode Assembly

(CRl)

Prime Power

Input

Filter Capacitor

TSR Power Supply 4-10

I/O Panel, Driver/Receiver Card 4-11

Diskette Drive

4-12'

4-8

4-9

Line Plate Card (World Trade Countries) 4-13

Operator Panel/Indicator Card 4-14

Logic Board Assembly 4-15

Operator Panel Switches 4-17

Communications Configuration 5-2

V.35 Communication Line Flow, Model

SIC

(Foldout) FO-1

Communications Line Flow, EIA 5-5

3274 Communications Line Flow, 1200-bps

Integrated Modem -U.S. and Canada; World Trade

Countries 5-6

Communications Line Flow,

DDS

Adapter 5-8

Communications Line Flow, Loop 5-9

Communications Line Flow, X.21 Card PN 8564561

Nonswitched (World Trade) 5-10

Communications Line Flow, X.21 Switched

and

Nonswitched -Domestic and World Trade 5-11

CBS

Data Coupler -U.S.

and

Canada 5-12

Communications Line Flow, 2400-bps, 4800-bps,

and

9600-bps Nonswitched Integrated Modems

(Model

SIC)

for U.S., Canada,

and

World Trade

Countries 5-15

Communication Cable Plugs (4-Wire, Nonswitched)

for U.S., Canada, and World Trade Countries 5-16

2400-bps Integrated Modem Card LED Locations

and

Test Results 5-19

5-13. 4800-bps Integrated Modem Card LED Locations

and

Test Results 5-20

5-14. 9600-bps Integrated Modem Card LED Locations

and

Test Results 5-21

5-15. Transmit Levels (Nonswitched) for

A/FE

and

E/ME/A

Countries 5-22

5-16. Transmit Level Switch Settings 5-23

5-17. 2400-bps Integrated Modem

Front

End Card 5-23

5-18. 4800-bps Integrated Modem

Front

End Card 5-23

5-19. 9600-bps Integrated Modem

Front

End Card 5-23

5-20. 9600-bps Integrated Modem Receiver Extension

Card 5-24

5-21. T

AC

Tone

Levels for

A/FE

and E/ME/A

Countries 5-24

5-22. Test Alarm Card

(T

AC)

Transmit

Tone

Level

Jumper1ng 5-24

5-23. Board Wiring for the Various Teleprocessing

Attachment

Configurations 5-25

5-24.

2400-,4800-,

and

9600-bpsCard

Functions,

Locations, and Codes 5-26

5-25.

Top

Card Connector Pin Locations 5-27

5-26. EPROM-Card-to-Processor Card Cabling 5-28

5-27. Pluggable ROS Removal

Tool

5-29

5-28.

Operator

Panel 5-30

5-29. Conversion

of

BSC Control Unit Address and SDLC

Control

Unit Address to Binary-Equivalent Modem

Address Switch Settings

on

3274 Model

SIC

5-30

5-30. Example

of

3274

Model51C

Modem Address Switch

Settings 5-30

15-31. Addressing Configuration for Multiple Interactive Screen

(MIS) -3290 Device Attachment, Model

SIC

5-31

A-I. Logic Board -Card, Connector, and Pin

Locations A-2

A-2. Pin Locations -

Top

Card Connector

A-3

A-3. Field Replaceable Units (FRUs)

A-4

A-4. Field Replaceable Unit (FRU) Part Numbers

A-5

A-5. Card

and

Board Part Number Selection

A-6

A-6. Configuration

and

CE Data

Cad

A-7

A-7. Printer Authorization Matrix

A-8

A-8. General Logic Probe

A-9

A-9. Prime Power Box Locations A-10

A-10. 3274 Models

SIC

and 52C Grounding

A-ll

A-II.

Card Plugging Cautions A-12

A-12. Card Locations (Foldouts) FO-3, FO-5

B-t.

Prime Power and

Input

(Single/Dual Supply)

B-2

B-2. Single Power Supply System

B-3

B-3. Dual Power Supply System

B-4

B4.

Power Supply Distribution, Flow Diagram

B-6

B-5. Board Voltage Distribution

B-7

B-6. Transformer

Input

and Fan Voltage Wiring (World

Trade)

B-8

C-l.

1200-bps Integrated Modem Card (No. 14),

N-Sw

and

N-Sw-SNBU, U.S. and Canada C-2

C-2. 1200-bps Integrated Modem Card (No. 14),

N.Sw

and

N-Sw-SNBU-AA, U.S. and Canada

C-3

C-3. 1200-bps Integrated Modem Card (No. 14),

SW-AA/MA,'U.S. and Canada

C-4

C4.

1200-bps Integrated Modem Card (No. 14),

N-Sw,

WT

except

Canada

C-4

C-5. 1200-bps Integrated Modem Card (No. 14),

N-Sw-SNBU-AA,

WT

except Canada

C-5

C-6. 1200-bps Integrated Modem Card (No. 14),

Sw-AA,

WT

except

Canada

C-6

C-7.

WTC

1200-bps Integrated Modem Transmit Level

Settings (Card No. 14)

C-6

Figures xi

C-8. Line Plate Current Adjustment Procedure,

WT

except Canada

C-7

C-9. Line Plate Automatic Adjustment

C-8

ColO.

Loop Card Jumpering (Card No. 14) (PN 2399082

and 8548788)

C-8

C-ll.

EIA/CClTT Card Jumpering (Card No. 14)

(PN

5864660,5864668)

C-8

C-12. DDS Adapter Card Jumpering (Card

No.

14),

U.S. and Canada Only

C-9

C-13.

Type

A Adapter Coaxial Panel Card and Cable C-I0

C-14. Cable from the

0IA-Al

Board

to

Diskette Drive File

Control Card C-12

C-15. X.21 Nonswitched Adapter Card Jumpering C-13

C-16. X.21 Switched

or

Nonswitched Adapter Card

Jumpering C-13

C-17. V.35 Card No. 14 Jumpering C-13

C-18. Cable -

Type

B Coaxial Panel to

Al

Board C-14

C-19. Loop Station Connector (LSC) C-15

0-1.

3274 Operator Panel -Model 51C with Digital

Data Service (DDS) Adapter

or

Models 51C/52C

with X.21

with/without

Encrypt/Decrypt

Feature

0-3

0-2.

3274 Operator

Panel-

Models 51C/52C with Loop

Attachment

0-4

0-3.

3274 Operator Panel -Models 51C/52C with 1200-

bps Integrated Modem or External Modem

0-5

D-4. 3274 Operator Panel -Models 51C/52C with 1200-

bps Integrated Modem with

(1)

Switched Line with

Auto Answer Feature

or

(2) Nonswitched Line with

Auto

Answer Feature

0-6

0-5.

3274 Opera

tor

Panel -Model51C with 1200-bps

Integrated Modem with

(1)

Switched Line with

Manual Auto Answer Feature

or

(2) Nonswitched

Line with SNBU and Manual

Auto

Answer

Feature

0-7

D-6. 3274 Operator Panel -Model

SIC

with

2400-,4800-,

or 9600-bps Integrated Modem

0-8

0-7.

Operator Panel Component Pin Locations

0-9

0-8.

Operator Panel Locations

(without

2400-,4800-,

or

9600-bps Integrated Modem)

0-10

D-9. Operator Panel Assembly Cable Plugging 0-11

D-lO. Operator Panel Card/Panel/Board Connection Wiring

Diagram without

2400-,4800-,

and 9600-bps

Integrated Modem Feature

(Foldout)

FO-7

0-11.

Operator Panel Card/Panel/Board Connection Wiring

Diagram with

2400-,4800-,

and 9600-bps

Integrated Modem Feature

(Foldout)

FO-9

E-l.

31

SO

Diskette Drive

E-3

E-2. 31SD Diskette

E-4

E-3. Diskette Insertion

E-5

E-4. 31SD Special Tools

E-6

E-5. 31SD Physical Characteristics

E-7

E-6. Environmental Characteristics E-8

E-7. Data Formats E-8

E-8. Maximum Number

of

Formatted

Data Bytes

E-8

E-9. Diskette Drive Parts

E-I0

E-I0.

Cylinder Access E-13

E-11.

Control

Lines

at

Connector

Al

E-14

E-12. Diskette Insertion and Head Load Operation E-16

E-13. Diskette Operation Sequence E-17

E-14. Write Operation E-18

E-15. Record Update -Write Operation E-19

E-16. Read Data Signals E-19

E-17. File Data Signals E-20

E-18.

31

SO

Test Pins E-20

E-19.

31

SO

Control

Card E-21

E-20. 31SD

Control

Card Cable E-21

xii

E-21. Collet/Flat Spring Removal E-22

E-22. Head/Carriage Pressure Pad Removal and

Replacement E-24

E-23. Head/Carriage Service Check E-26

E-24. 31SD Control Card E-27

E-25. Head/Carriage Adjustment E-28

E-26. Head/Carriage Removal

E-31

E-27. Head/Carriage Replacement E-32

E-28. Solenoid and Bail Service E-35

E-29. Head Gap Adjustment E-37

E-30. Bail Removal E-39

E-31. Solenoid and Idler Removal E-40

E-32.

AC

Drive Motor Removal E-42

E-33. Stepper Motor E-44

E-34. Stepper Motor Pulley and Clamp Removal and

Replacement E-46

E-35. Drive Band Adjustments £-47

E-36. Diskette Speed E-49

E-37. LED

Output

Check E-50

£-38. LED Removal and Replacement E-51

E-39. PTX Amplifier Service Check E-52

E-40. PTX Removal and Replacement E-54

E-4l.

Diskette Drive Control Card E-55

E-42. 31SD Control Card and Cable Pins E-56

F-l.

IBM

51TD Diskette Drive F-2

F-2. 51TD Diskette F-2

F-3. Diskette Insertion F-3

F-4. 51TO Special Tools F-4

F-5.

51

TO Physical Characteristics F-5

F-6. Environmental Characteristics F-6

F-7. Data Formats F-6

F-8. Maximum Number

of

Formatted

Data Bytes

F-6

F-9. Diskette Drive Parts F-8

F-10. Cylinder Access F-13

F-Il.

Control Lines at Connector

Al

F-14

F-12. Diskette Insertion and Head Load Operation F-15

F-13. Diskette Operation Sequence F-16

F-14. Write Operation F-17

F-15. Record Update -Write Operation F-18

F-16. Read Data Signals F-19

F-17. File Data Signals F-20

F-18. 51TD Test Points F-21

F-19. 51TD Control Card F-21

F-20. 51TD Control Card Cable F-22

F-21. Collett/Flat Spring Removal F-23

F-22. Head/Carriage Service Check F-27

F-23. Control Card F-28

F-24. Head/Carriage Adjustment F-29

F-25. Head/Carriage Removal F-31

F-26. Head/Carriage Replacement F-33

F-27. Solenoid and Bail Service Check F-35

F-28. Head Gap Adjustment F-37

F-29. Bail Removal F-39

F-30. Solenoid and Idler Removal F-41

F-31. AC Drive Motor Removal F-43

F-32. Stepper Motor Removal and Replacement F-47

F-33. Stepper Motor Pulley and Clamp Removal and

Replacement F-49

F-34. Drive Band Adjustments F-51

F-35. Diskette Speed Check F-53

F-36. LED

Output

Check F-54

F-37. LED Removal and Replacement F-55

F-38. PTX Amplifier Service Check F-57

F-39. PTX Removal and Replacement F-59

F-40. Diskette Drive Control Card F-60

F-4l.

Diskette Drive Locations and Card Test Points F-61

F-4l.

Diskette Drive Card Connector Pins F-63

Chapter 1.

Introduction

1.1 General

This manual

gives

the information needed by the Product

Customer Engineer to maintain the 3274 Control Unit

Models

51

C and

52C.

This information includes:

• Subsystem Problem Isolation Procedure

• Maintenance Analysis Procedures

(MAPs)

• Removal and Replacement Procedures

• Communication Reference Information

Entry into, and

use

of, the

MAPs

and Maintenance Proced-

ures should result ollly from performing the sequential

steps

of

the Subsystem Problem Isolation Procedure.

This manual

also

supplies:

• Illustrations

•

31

SD

Diskette

Drive

Maintenance

•

51

TD

Diskette

Drive

Maintenance

In

most cases, the information supplied isolates a

problem to a defective or loose

field

replaceable unit

(FRU), cable, or connector. If the problem cannot

be

isolated and repaired

by

performing the Subsystem Problem

Isolation Procedure and associated

MAPs

and Maintenance

Procedures, request assistance

from

the next

level

of

the

support structure.

1.2 l"'Iaintenance Approach

The

maintenance approach to 3274 problems

is

illustrated

in

Figure

1-1.

This approach involves performing the

following sequential steps

of

the Subsystem Problem

Isolation Procedure:

Step 1 - Obtain the 3274 Problem

Report

Form from the

operator. This form

is

used by the operator to record the

status (indications)

of

the 3274 when a problem

is

encount-

ered. If the form

has

not been completed, perform the

procedure described in the Problem Detenninatioll Guide

(PDG), GA27-2850, and record the necessary information.

Steps 2 through 9 - Steps 2 through 9 must

be

performed

sequentially. If the problem

is

encountered by these steps,

you

will

be

directed to

an

FRU replacement figure (chart),

a

MAP,

or a maintenance procedure.

When

the problem has

been isolated and repaired, the Machine Checkout

MAP

AIOO

must

be

used to verify correct operation. Steps 2

through 9 include the following tests and checks:

• Step 2 - Verification that the

DC

Power light

is

on

• Step 3 -

Bus

Test

• Step 4 - Internal tests/IML load

• Step 5 -

Device

driver/receiver check

• Step 6 - Display symbol/error suffix check

• Step 7 - Operational indicator check

• Step 8 - Host tests

• Step 9 - Voltage checks

Step

10

-If the problem

was

not encountered by Steps

2 through 9, this step directs you to repeat Steps 2 through

9. If the problem

is

not encountered while Steps 2 through

9 are being repeated, Step

11

is

performed.

Step

11

-Step

11

first directs you to the Symptom Repair

List. Ifthis list does not assist you

in

isolating and repairing

the problem, Step

11

directs you to request assistance.

This assistance should

be

the support structure and/or local

assistance, which may consist

of

data searches, diagnostic

assistance, and/or on-site assistance.

The

first step

will

normally

be

a data search, ifavailable.

Diagnostic assistance may

be

performed by the support

structure and/or locally. The method used should

be

that

which

will

resolve the problem most rapidly.

Initial on-site assistance

will

usually

be

local.

Step

11

Repeat

Steps

2

through

9

once.

Problem

cannot

be

isolated.

Symptom

Repair

List/Request

Assistance

Service Call

Steps

2

through

9

Perform Subsystem

Problem Isolation

Procedure

Step

10

• MAP

•

Maintenance

Procedures

Figure 1-1. Maintenance Approach

Problem

isolated

and

repaired.

End

of

Call

Chapter 1. Introduction l-J

1.3 Field Replaceable

Unit

(FRU)

Locations

Before using the service information in this manual,

you

must identify the machine model number and the 01

A-A

1

logic board type. This information

is

needed to identify

the

FRU

locations when using the

MAPs

and maintenance

procedures.

1.3.1 Machille Model Number

The machine model number (51

Cor

52C)

is

located on the

machine identification plate. See Figure 1-2. General

physical locations and diskette insertion are also shown in

this figure.

1.3.2

0IA-Al

Logic Board

The type and layout

of

the

0lA-Allogic

board

is

deter-

mined

by

the machine model number. These boards are

shown in Figures

1-3

through 1-6

as

follows:

Figure

1-3

Model

51

C

with/without

the Category B

Device Attaclmlent Feature. Machines

with the Category B Device Attaclilllent

have the B coaxial panel and have cards

in positions B, C, D, E, and

F.

Figure

14

Model52C (Kanji/Chinese) with storage

greater than 64K. The 52C

is

a Kanji

(Japanese/Chinese) model control unit.

Figure

1-5

Model

51

C without

2400-,4800-,

and

9600-bps Integrated Modem.

Figure

1-6

Model

51

C with 2400-, 4800-, and

9600-bps Integrated Modem.

Warning: When the board

is

in the service position, the

card/connector rows (1, 2,

3,

4,

5,

6)

are inverted.

Be

careful when identifying the correct position

of

any card or

connector.

1.3.3 Card Numbers

To identify the logic cards in the different types

of

01

A-AI

boards, the

MAPs

use card numbers. The card number and

the board type are used to index a card location chart

(Figure 1-7) to determine the actual card location. Foldout

illustrations at the rear

of

this manual (Figure

A-I2,

pages

FO-3 and FO-S) containing the OIA-AI board layouts and

card location charts are provided for

your

convenience

when using the

MAPs.

1-2

1.3.4 Operator Panel

Basic operator controls for 3274 Models 51C/52C without

communication features (loop, I200-bps Integrated Modem,

etc.) are shown in Figure 1-8. See Appendix D for operator

panel locations, switch functions, indicator descriptions,

panel layouts, and wiring diagrams. .

A functional description

of

these basic controls follows.

1.3.4.1 IML Options

-J'hree IML options are made available

by

the ALT switch,

a three-position

pushbutton

switch. The three positions are

o(normal), ALT 1, and ALT 2. When IML is pressed, the

position

of

ALT determines the IML control-storage entry

point. The operation is variable, depending

on

which

diskette is installed. The following describes the operation

with the system diskette installed.

Nonnal: With ALT in the normal

(not

depressed) position,

pressing and holding IML will cause a Bus Test

to

be per-

formed. ReleaSing IML after a Bus Test will cause the IML

Test

to

run. At the successful completion

of

the IML tests,

Operational Code

is

loaded. The IML tests require approxi-

mately 1 minute

to

execute. Successful completion

is

indicated by all indicators being on. All indicators remain

on

while the Operational Code is being loaded, and all

turn

off

upon completion

of

this load. The operational

code load takes approxinlately 45 seconds.

ALT 1: Momentarily pressing IML while holding the ALT

switch in ALT 1 permits the Operational Code to be loaded

directly (bypassing IML tests). This load procedure should

be used only following a normal IML

attempt,

and is

intended for those situations where the normal IML fails

but

useful work can still

be

performed

by

the Operational

Code.

Notes:

1.

A normalIML

attempt

is

required to initialize

memory

and bring the 3274 up.

Press

IllIL with

ALT

in the

l10rmal position before allY other startup

method

is

attempted.

12. Only

an

IBllJ

3178,3278,

or

3279 Display

call

be

attached to port 0 during Ill!L.

ALT 2 without 2400-, 4800-, and 9600-bps Integrated

Modem Feature: The Modem Wrap Test can be initiated

by using the ALT 2 function

as

well

as

the Normal IML

Test (with wrappable modem). Momentarily pressing the

IML pushbutton while holding the ALT switch in the

ALT 2 position invokes an extended Modem Wrap Test.

Some types

of

modems require manual intervention

to

set

up for wrap testing.

For

a wrappable modem, the test

checks the transmission path (Transmit and Receive Data

lines) to and from the modem. Modem clocking

is

required

to

run this test successfully, and a missing or defective

modem clock, or a Wrap Test failure, will indicate a 0111

failure code.

For

a nonwrappable modem, the data wrap

path

is

to and from the Test/Operate switch at the end

of

the communication cable. The procedure for ALT 2 with

nonwrappable modem

is

in Chapter

5,

paragraph 5.3. The

Modem

Wrap

Test requires approximately 1 minute to

complete.

ALT 2 with 2400-,4800-, and 9600-bps Integrated Modem

Feature: See paragraph 5.4 for a description

of

the ALT 2

functions

as

related to Integrated Modems.

1.3.4.2 Indicators (8 4 2

1)

The four lights (8 4 2 1) on the panel are the operational

indicators. These indicators first serve

as

Bus and Lamp

Test indicators:

if

all indicators are

on

while the IML

pushbutton

is

pressed, a successful Bus and Lamp Test

is

indicated. When the IML pushbutton

is

released, all lights

go

out

and the

3274

proceeds to execute the IML tests.

During IML, these lights indicate IML test failures. Test

segments are run sequentially, and the particular segment

running

is

indicated by the lights in 8 4 2 1 code. When

a failure is detected, the test stops and the failing test

number

is

displayed in the operational indicators

(8 4 2 1).

While Operational Code

is

running, the lights indicate

the last recoverable error encountered. The problem-

isolation sequence uses this data from IML tests and

from operational tests.

Chapter

1.

Introduction

1-3

Type

B

Coaxial Panel

Note:

The fan

assemblv

(OtL)

is

not

shown.

Access

Panel

Figure 1-2. 3274 Models 51C/52C Locations

1-4

Power

Supply

No.2

01E

Power

Transformer

01G

,-

__________

Line Plate (WT

only)

01C

Diskette

*~-------

Reader

Enclosure

01A-Al

Yl

Y2

Y3

Y4

110

II

Not Used

II

DC

Power

II

.~

.....

" Connector Not Used

A C D G H M N

nnn

--

--INotell-

---

N

~

lOX

8

M -

-0

> 0 0

~

- 0

<1:-l >

(1)-

0 N M

r~

o:!

a:

(;

0 0

0-

0>

0

_0

~

> 0

"0

I-a:

<1:0 > > >

0- N

~

'"

-N

t

~

..,

~

w~

<{

~

..,

30

il

t

~

!!l

<

Ii

M N N <0 <0

!

~

U M

'"

e

~

0-

~

u u

cil

~

D>

e

Ci

~

.g

14

:z:

'E

5

'g

~

..

j

f!

< < <{

";t

m

!!l

..J I 0 0

j 0

~

U

I-

~

g l

~

ci) ci)

c:

u

<{

~ ~

~

'E

'~

'E 'E

i5

8

~

c3

g

~

t! u

E

c3

0 0

al al

al

8 0 0

i=

~

:5

II>

t! t! t!

c:

l-

e;

0 Z

0-

:c

a:

21

25 24 27 26 10

Not

Used

II

B De.icel

II

A Devices

II

DC

Power

0-3 0-7 Loop Only

ZI Z2 Z3 Z4 Z5 Z6

Notes:

1.

Category 8 device adapter cards. 4. Type A Driver/Receiver Card No.

28

located behind the I/O coaxial panel.

2_

Cable

is

in

Z5

or

Z6

depending upon interface installed.

5.

Top card connector position

(Xl

is

not

required when storage

is

64K. Your machine

may

already have connector installed.

3.

Not

present when control is equal

to

64K.

Figure 1-3. OIA-AI Board -Model

SIC

{with/without Category B Devices -

PN

5699828

01A-Al

Y2

Y3

Y4

1/0

II

Not Used

II

DC

Power

II

Not Used

II

Connector

A C D G H K M N

n

~

8

0

g~

>

t

NX

a:

(;

N M M M g

~-

~

0 0 0 0

~

_ 0 0

"0

0 0 0 0

<1:

0 >

_ 0

..

> > > > >

<

w-l

M N

'"

~

..,

0-

]

'0

"il

~

i

<{

u u u 0

<0

$ $ $ $

5

:5 :5

:¥

~

'0.

~

til

~

'"

.. ..

:J

'E

14

.3

D>

~ ~

.,

:I:

f!

0 0 0 t 0

";t

0 g 0

l5

0

~

~ ~

z z Z

I-

Z

..

cil

ci)

<{

u E

t:

i5

u 8 8 8 g

~

g g g g

~

8-

t!

al

8 0 8 8 8 8

:5

0 Card

0

Z Crossover

21

12

10

13

~

Card Number

Not

Used

II

Not

Used

II

A Devices

II

DC

Power

0-7 Loop Only

Zl

Z2

Z3

Z4 Z5 Z6

Notes:

1.

'Cable is

in

Z5

or

Z6

depending upon interface installed.

2. Type A Driver/Receiver Card No.

28

located

behind

the coaxial panel.

Figure 1-4. OIA-AI Board -ModelS2C (Kanji/Chinese) -

PN

5643330

Chapter

I.

Introduction

1-5

OIA-Al

V3

V4

II

DC

Power

II

Not Used

II

G H K M N

1-:

'0

"C

i;

8

~

:5

~

0

:>

! >

0 0 0

z z

~

II

oc

0

;;

N 8

~

t

~

> '0 0

Ii

t

~

> '0 '0

2

~

N > > M

~

2 I M N u M

:'j,

~

u u

0 II E

~

'g. 'g.

cii

a a

~

:5 :5

:5

14

J:

~

< t

..

..J ..J

j 0 0 0 u

...

~

g J g

~

1 1

~

z

~

1

z u 0 8 8

I-~

E

~

g u u

~

i=

...

8 u

::l

OJ

] 0

~

g E

:5

Ui

~

'g

0

Z Card

oc:!:

Crossovers

21

24 27 26 13 12 10 _ Card Number

A Devices

II

0-7

Not

Used

Not

Used

II

DC

Power Loop Only

ZI

Z2 Z3

Z4 Z5 Z6

Notes:

,.

Not

present when control is equal

to

64K. 4. Top card connector position (X)

is

not

required when storage

2.

Cable

is

in

Z5

or

Z6

depending upon interface installed.

is

64K. Your machine

may

already have connector installed.

3. Type A Driver/Receiver Card No.

28

located behind the I/O coaxialpanel.

Figure

1-5.

01A-A1 Roard -

Model

SIC without 2400-,4800-, and 9600-bps Integratcd Modem -

PN

5643329 or 6226635

II

Not Used

I[

H-V H-V c D G H-V

See Note See Note

~

See Note

"C II

~

u

:5

u

:5

<t

~j

0 u 0

<t

a

I-

<t

z

I-

zZ

I-

]

"E

c. 0

Ii

15

!i!

"E

c.

w

>

OJ

"C

c:

j

~

.~

>

c:

u

Il

OJ

0

18

II

c:

~

0

i

18

.t

:5

u:

.t

:5

oc

e

e.

18

u:

0

~

0 0

~

0

u.

~

0

0 0 0 0 0 0 0

]

~

Z

'<t

j 0 Z

~

0

~

to

'"

~

Ol

~ ~

~

M e

.~

~

"C "C

a:

a..

oc

~

"C

~

..

~

OJ

:5

c.

0

:5

0 0 "i' g

!~

g:

0

g:

0

g:

0 0

Z Z 0 0

Z

to

Ol

en

~

21

19 17

20

21

19 17

21

19

16

17

iH.V H·V

H.v

A Devices

II

I[

A Devices

II

I[

A Devices

II

I[

1M

1M 1M

0-7 0-7 0-7

ZI Z2 ZI Z2 ZI Z2

~

Model

51

C

with

1M

2400

Model 51C

with

1M

4800

Model 51C

with

1M

9600

*If

installed

Note:

Sockets

H-

V are the same

as

the

board

layout

in Figure

'-5.

Figure 1-6.

01A-A1

Board -Model51C with 2400-,4800-, and 9600-bps Intcgrated Modem -

PN

563329'or 6226635

1-6

Card 52C

Number

Card FUnction 51C Kanji

1 Control Storage 32 (Note

1)

Note

1

Note

1

2 Control Storage

64

(Note 1)

Note

1

Note

1

3 Control Storage 64·R (Note 1)

Note

1 Note 1

4 Storage Feed

Thru

(4W)

or

Storage Logic (4W)(Note

2)

01A·P2

01A·M2

5 Storage Feed Thru (2W)

or

Storage Jumper (Note 2)

01A·Q2

01A·N2

6 Storage Jumper

(Note

2)

01A-Q4

01A-N4

7

Control

Logic 1

01A-N2

01A-L2

8

Control

Logic 2

01A-M2

01A-K2

9

Control

Logic 3

01A-L2

01A-J2

10 Diskette Adapter

01A-K2

01A-F2

(Note 3)

11

Response

Time

Monitor

w/wo

Type-B Board

01

A-B4 -----

11

Response Time

Monitor

w/wo

24,48,96

1M

Board

01A-C4

_

..

_----

12

Type

A Terminal Adapter 01A-J2

01A-D2

13 CCA/HPCA

01A-H2

14

EIA/DDSA/1200

IM/Loop/X.21/V.35

(Note

4)

01A-G2

15 2400-, 4800·bps IM Receiver

01A-F2

.........

----_

...

16 9600-bps IM Receiver

Ext

01A-D2

-.-.........

_-

17 2400-, 4800·bps IM Processor

01A-D2

._-----

....

_--

17 9600-bps IM Processor

01A·E2

_

..

_--------

18 2400-, 4800-, 9600-bps

TAC

(Note 4)

01A·C2

---.-----.

19

2400-,4800-,

9600-bps PROM

01A-B4

-_

..

_-------

20

2400-,4800·,

9600-bps

1M

Front

End

01A-G2

---------

21

Encrypt/Decrypt

(See

Note 5)

01A·A2

------

..

_

..

_--

22 File Control (located in the diskette drive)

01A·K

01A-K

23

Not

Used

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

---_

..

_

..

_----

24 Type B Terminal

Adapter

1

01A·D2

-------._

..

_-

25

Type

B Terminal

Adapter

2

01A·C2

----------.

26

Type

B Terminal

Adapter

3 01J1.F2

---_.-------

27

Type

B Terminal

Adapter

4

01A·E2

.--------

..

28 Type A Driver/Receiver (Note 6)

OlS-A

1 01S-A1

29

Not

Used

------_

...

-_.

.....

_---

....

_--

30

Type B Driver/Receiver

01A·B2

--

..

-

....

-

..

_--

31

Not

Used

..

----

..

-----.

.....

-

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

32 CCA/HPCA Interface Jumper

01A·Y6

01A-Y6

Notes:

1.

For

card

locations,

see

the

board

storage

layout

(Figure 2-4).

2. With some

part

numbers

it

is possible

to

plug

card

in

backwards.

To

ensure

correct

plugging

position,

see

Figure

A·".

I 3.

Jumper

should

not

be plugged on this card. This

jumper

is

for

manufacturing

testpurposes

only.

4.

Jumper

or

switch

setting required

(see

Appendix

C).

5.

Card removal destroys the master

key

(see

paragraph 6.1.3),

6.

Located

behind

the

I/O

coaxialpanel.

Figure 1-7. Card Location Chart

Chapter 1. Introduction

1-7

Alt IML

Address 8 4 2 1

0000

Ref

Description

o

On/Off

switch:

fTl

=

On;

lQJ

=

Off.

D On

indicator:

Indicates

the

3274

is

on.

D IML (Initial Machine Load)

pushbutton:

Pressing

and

holding

causes

a basic

test

to

run.

When

the

pushbutton

is released, IML

tests

start.

At

comple-

tion,

the

machine

is

loaded.

o

Alt

IML

Address

switch:

•

1:

Holding,

while

momentarily

pressing

the

IML

pushbutton,

bypasses

the

tests

and

loads

the

machine

directly.

Use

only

after

normal

IML fails.

•

2:

Holding,

while

momentarily

pressing

the

IML

pushbutton,

invokes

adapter

and

wrap

tests.

Used

Only

with

Integrated

Modems

•

3:

Holding

the

AL

T IML

Address

switch

in

AL

T 2 will

cause

the

Modem

Self-Test

to

be

initiated

and

repeated

approximately

every

4

seconds

until

the

switch

is

released.

8 4 2 1

indicators:

These

indicators

light

while

the

IML

pushbutton

is

held.

During IML,

they

follow

the

test

sequence.

At

completion,

they

go

out.

During

operation,

they

indicate

operational

status.

Figure 1-8. 3274 Models 51C/52C Basic Operator Controls

1-8

Chapter

2.

SubsysteJn Problem Isolation Procedure

The steps in the Subsystem Problem Isolation Procedure

must be performed in sequence.

If

you encounter a prob-

lem when performing these steps, you will be directed to

an FRU replacement figure (chart), a MAP,

or

a main-

tenance procedure. When the problem has been isolated

and repaired, the Machine Checkout

MAP

(AI00) must

be used

to

verify correct operation.

Note: When servicingModels

5IC

and

52C,

observe the

applicable safety notices listed under "Safety Notices, " in

the front

of

the manual.

Step 1 - Using the Isolation Procedure

.

a.

Start with a completed Problem Report Form. Figure

2-1

shows a sample 3274 Problem Report Form.

Note:

If

the customerhas

not

completed the fonn,

follow the 3274

PDG

procedure before starting the

Subsystem Problem Isolation Procedure.

Refer

to the

Problem

Report

Form while following the Subsystem

Problem Isolation Procedure.

b.

If

a problem

is

encountered during installation or cus-

tomizing, or after installing a Miscellaneous Equipment

Specification (MES),

go

to

MAP

AlSO. Installation and

customizing cannot be considered completed until the

3274 has operated online successfully.

c.

Follow this problem isolation flow sequentially until

you have fixed the problem, or use

your

support struc-

ture for aid

if

the problem

is

not corrected. Go to

the next step

if

the step you

are

performing does

not

fix

the problem or does not apply.

Note:

If

you

are in a repetitive loop, request assistance

from the

of

the support structure.

d. The IML tests do

not

check the driver/receiver cards.

(Step 5 will assist you in isolation

of

a defective driver/

receiver card.)

If

this is a single-device failure, it is

assumed

that

the maintenance procedure for

that

device has been performed.

Warning:

For

integrated modem multipoint attachment,

when the

3274

I/O telephone cable is unplugged,

the

telephone socket must be terminated with 600-ohm

resistors. The 600-ohm terminating plug (shown in

Figure 5-11, Part 1

of

2) can be used.

e. See Chapter 5 for communication reference data,

Appendixes A through D for location drawings, power

information, board layouts, and cable drawings, and

Appendix E for

31

SD

or

Appendix F for

51

TO diskette

drive maintenance information.

f.

Go

to

Machine Checkout

MAP

Al

00

after this fix. Go

to

the

if

this step did

not

fix your problem or

does

not

apply.

Step 2 - Power Test

a. Check

the

OC

On light:

if

it

is

off,

go

directly

to

Power

MAPAI20.

b.

If

all the operational indicators (8 4 2

1)

are on:

(1) Check for loose cables in the operator panel assem-

bly. See Appendix D and Figure D-9.

(2) Replace the operator panel indicator card.

Step 3 -

Bus

Test

a.

If

the Bus Test fails, go directly

to

Bus

Test

MAP

AID.

Note: A successful Bus Test

is

indicated

if

all the opera-

tional indicators

(8

4 2 1)are on while the IAfL pushbutton

is

pressed andheld, and

ifall

the indicators go

offwlzen

IML

is

released.

Go to the next step

if

this step did

not

fix your problem

or does

not

apply.

Chapter 2. Subsystem Problem Isolation Procedure

2-1

'----.'

Step 4 -

Internal

Tests

Note:

17le

ill-IL diagnostic tests

nm

automatically when the

3274

is

powered on and when the ill-IL pushbutton

is

pressed and released. During these tests the 8 4 2 1 indi-

I

cators should sequence

0001,0010,0011,

etc., ending with

all 8 4 2 1 indicators on.

17,e

indicators remain on

as

the operational code

is

loaded, and go

off

when the tests

run successfully. A failure

is

indicated when the 8 4 2 1

indicators flash

or

display the same

count

continuously.

If

the operational code detects a failure, a failing code

appears in the 8 4 2 1 indicators after the operational

code

is

completely loaded (all indicators off). The

indicators may display this code alternately

or

continuously. Depending on the diskette level, some codes

may flash for 5 seconds and then alternate with another

continuous code for 3 seconds.

Use

the flashing code in

determining the failure code in procedures, MAPs, etc.

After a successful loading

of

the operational code,

all

terminals attached

to

the 3274

that

are ready should

display a

@]

in

the Operator Information Area (OIA).

Ready

Symbol

'/

Operator

Information

Area

A Normal Display

in

the

Ready

State

3290 Display Sequence

a.

When the

3290

is

powered

on,

the Basic Assurance Test

(BAT) starts and the BAT sequence numbers (binary

count)

appear in the OIA.

If

a failure occurs, additional

numbers may appear in the OIA. The correct end code

is

equal to 1000.

b. When the BATs are completed and the

3274

is

ready

with the proper load diskette inserted, communication

with the

3274

is

established and a 0 appears in the

OIA.

c. Microcode loading from the control unit starts. Then

test numbers will appear in the OIA.

If

a routine

number remains displayed for more than

30

seconds,

this indicates a failure in

that

routine.

d. When the microcode loading

is

done, a

[±1

(or

a <2 >,

if

previously in setup mode) will appear in the OIA.

The time between power-on and the appearance

of

the

[±1

in the OIA should

not

exceed 2 minutes.

Internal Test Procedures

a.

For

a

3274

with either the 2400-, 4800-,

or

9600-bps

Integrated Modem feature, switch power

off

and

then

on.

b. For a

3274

without

an Integrated Modem feature,

press and release the IML pushbutton.

c. Figure 2-2 can be used to determine the failing area.

Also, see item d.

Operational Indicators rrrn

Error Code

~

d. Use Figure 2-3, which shows error codes correlated

to

all

possible card failures in order

of

probability. Change

cards according

to

probability.

If

the card swap does

not

correct the problem,

go

to

Power MAP

A120,

step

049,

entry

point F (measure voltages).

e. Isolate the control-storage failure

to

a specific control-

storage card

or

cards

by

using the code

that

appears on

display 0

or

in the

3274

8 4 2 1 indicators (Type A).

The system diskette or load diskette code level

determines

how

to

display the failing 0101 code and

card code in either

of

the following methods:

Only

at

display location

AO

Code 0101 followed

by

XXY indicates a control storage

failure, including the failure storage card and module.

See Figures 2-4 and 2-5.

At

the

3274

8 4 2 1 indicators and display

AO

The 0101 code will flash for 5 seconds and

another

code

representing additional card failures will be displayed

continuously for 3 seconds. The codes displayed at the

3274

will repeat. See Figure

24.

If

the

3274

is

newly installed

or

has been recustomized,

verify

that

3274

configuration response number 113

agrees

with

the configuration or data card and

with

the

actual

3274

storage capacity (see Figure 2-4).

The

configuration data card is stored in the

3274

access

door

pocket.

f.

If

the IML tests fail and the card swap does

not

correct

the problem, go to Power

MAP

A120, step 049,

entry

point

F (measure voltages).

g.

Do

not

go

to

the next step unless the IML tests run

successfully.

Chapter 2. Subsystem Problem Isolation Procedure

2-3

I

2-4

0110

0001

See Note 2

~

0101

0111

,---------

I

I DDSA

I Card

'I

----~

'I

Control

Storage OR J...OR

0000

Type

A Control

No.

14

Card Terminal

Adapter

No.28

Card No.

12

0010

Diskette

Adapter

Card No.

10

Logic

Card Nos. AND

7,8,9

•

&"--;:;==!..-OR

64K

Control

Storage

Minimum

Card Nos.

Response

Time

Monitor

Card No.

11

>

1--

64K

~

-I

I

,

I

Vol 0

Card

No.3

Control

Storage

Exp Migrator

Card Nos.

4.

5,6

Control

Storage

Vol',2,3

Card Nos.

1,2

Type

B

Terminal

Adapter

Card Nos.

24,25,

26,27

1001

L..:

____

_

Notes:

Encryptl

Decrypt

Card No.

21

1.

To

convert

card

number

to

a

boardlcard

socket location,

see

Figure

A-12

(pages

FO-3

and

FO-5J

or

Figure 1-7.

2.

See

attached327813279 display

on

Port

0

and

use

Figure 2-4.

Figure 2-2. 3274 Hardware Block Diagram (Models

SIC

and S2C)

1200·bps

Integrated

Modem

Card No. 14

ErA

or V.35

Card

No. 14

OR

X.21

Card

No.14

Loop

Card

OR

I

No.14

, 2400·, 4800-,

·1

9600·bps

I Integrated

I Modem

Card Nos. I

I

14,15,16,

I

17,18,19,20

I

L

_______

J

TP Line

to

Channel

Service Unit

(CSU)

TP Line

to

Host

TP Line

Modem

TP Line

Modem

Line

to

Station

Connector

(LSC)

TP

Line

to

Host

'--.-

Use

for

Errors during

IML

/

,..----------'

This figure shows error codes (fail codes) correlated to all possible card failures

in

order

of

probability. To convert

the

card

number

to

actual

I

board/card

socket

location, see Figure A-12 (FO-3, FO-5)

or

Figure 1-7.

If

codes

0101,0110,

and 0111 are alternating, use

the

flashing code

as

the

failure indicator.

U

IML

Fail

Code Card Reference Number

0000

1

7,8,9,3,1,2,4,2

5

,2

6

,2

11

,12,13,27,10,21,

I

14,25

0001 1

3,7,4,2

0010

4

1Q,

22, 27, 26,

24,11,12,13,14,9,21

00114

12,13,14,24,28,10

0100

4

12,13,28

01015

1,2,3,4,2

5,2

7,9

Do

this first

0110

5

13,

14

0111 5

13,

14

6

w/o

2400-,4800-,

or

_or

9600-bps Integrated Modem feature

0111 5 With

2400-,4800-,

or

9600-bps Integrated

Modem feature

1000

4

24,25,26,27,30

1001 4

21

1001-

1110

7

1001-

1010

7

1110

1

1010

4

10,13,8

1

,2-

Do this first

10114

11

1101 4 None

11114

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

1

The

8 4 2 1

indicators

are

continuously

displaying this

code.

2 With

some

part

numbers

it is possible

to

plug this

card

in

back·

wards.

To

ensure

the

correct

plugging

position.

see Figure

A-II.

1

3 II.

during

use

of

a

customized

system

diskette.

a successful

AL

T 1 IML

can

be

performed,

the

operational

code

was

properly

loaded

from

the

diskette.

This eliminates

the

diskette,

cables,

motor

rotation.

fuses,

and

voltage as

possible causes.

4

Code

is usually flashing (alternately on/olll.

Figure 2-3. Failure Code to Card

or

MAP

Entry

~

Map, Reference Figure,

and

Notes

Go

to

MAP

A20 if card-swapping did

not

fix

problem

or

if

not

all

cards are available.

Check for

proper

diskette.3

Go

to

MAP

A40

if problem still exists.3

Check for loose card in

socket

Y6. Go

to

MAP A50.

Go

to

MAP

A50.

See Figure 2-4.

See

Step

8 in this chapter

and

Chapter

5,

paragraph 5.3 (Wrap

Testl.

See Chapter

5,

paragraph 5.3 (Wrap Test).

~

See

Chapter

5,

paragraph 5.4-.5.6.

Go

to

MAP A90 (Model

51

Conly).

The

customer

security

administrator

must reload

the

master key

after

the

card

is

removed

and

replaced. This

procedure

and

the

associated

encrypt/decrypt

information are

contained

in Chapter 6.

The

3274

does

not

have

the

required storage. Verify storage cards.

See Figure 2-4. Verify Customization Response

113.

Occurs for

Configuration

Support

0 and above.

Incorrect system diskette

or

load diskette for Model

51

hardware.

Verify system diskette

or

load diskette. Occurs for Configuration

Support

0

and

above.

The

3274

control

storage does

not

match

customization

response

113.

Occurs when performing an AL

T-1

operation.

Verify

that

storage cards are correct. See Figure 2-4.

Change diskette drive file control card (card No. 22)

and

system

diskette.9

If

the

board has been replaced, verify

that

board

wiring has been

properly modified. See Figure 4-14.

Uncustomized system diskette.

Operational

code

failed

to

load correctly.

Try

spare system diskette.

Is Code

is

usually flashing,

but

may

alternate

between

a

flashing

and

a

continuous

code.

6

If

code

0111

is

displayed

continuously,

replace

card

numbers

24.

25,26,

and

27.

7

The

two

codes are

alternating.

8 II HPCA installed.

9 This

code

can

occur

during

any

IML

sequence

or

during

operational

code

load.

Chapter 2. Subsystem Problem Isolation Procedure 2-5

I

Display 0

(Type

A)

xxv

~

Ind~ates

Failing

Control

Storage

Carfd:r-_S_e_e_N_o_t_e_3

_____

--r-

__

----.

~

\ Model

lr

51C

52C

0101

I ,

\

,

Indicates

control

storage

failure

(Flashing)

0000

0001

0010

0011

0100

0101

0110

0111

0

1

2

3

4

5

6

7

R2

P2

S2

02

T2

U2

S2

V2

T2

-U2

-V2

-

Indicates Failing

Control

Storage

Module (displayed

continuously)

1000

8

Note

2

XX

= 01

to

18

(module

numbed

See Figure 2-5

for

card

module

layout.

XX

=

19

(multiple

module

failure) See

Note

1.

1001 9 •

P2,

02,

04,

R2,

S2

• Check

customization

N2,N4

M4, P2

Q2

Example:

XXV

=011 responses

113,

151

Failing

module

= 01 • Verify

extra

wire

Failing

card

could

be

S2

or

Q2

depending

on

board

type.

from

02G02

to

Alternating

Fail

Code

ALT IML

Address

-\

842

1/

01

01-

Flashing 5 seconds

Indicates

Control

Storage

Failure.

Note

4.

a 0

1

::

o~

XX

XXi-

Continuous

3

seconds

Indicates

Control

~

Storage

Code

02G12

~~

Card

Type

Card

Number

32

64 2

~'-----i------'

64R

-3

Failing Card

Code

Model51C

With/Without

Type

B

Adapter

Configur-

Location

ation

Response

Storage

Volume

1.13

02

01

00

V2

U2

T2

S2

R2

02

04

P2

64

Base

64R

..

AOOO

96

Ext

Funct

Store

(3630)

32

64R • · ·

BOOO

128

Ext

Funct

Store

(3632)

64

64R • · ·

0000

or

(1800)

128

Ext

Funct

Store

(3630)

32

64R * * ·

COOO

(3631)

192

Ext

Funct

Store

(3632)

64 64

64R • · ·

DAOOO

(3650)

or

(1800)

(3650)

192

Ext

Funct

Store

(3630)

64

32 32

64R • · ·

CAOOO

(3631)

(3650)

·Storage

Jumper

cards and Storage Logic card are

required

for

above

64K.

• ·Base Storage Feed

Thru

cards are

required

for

64K.

Figure 2-4. Control Storage Error Codes/Card Locations

2-6

Model

52C

(Kanji/Chinese)

Configur-

Location

ation

Response

Storage

Volume

113

03 03 03 03 02

01

00

V2

U2

T2

S2

R2

02

P2

N2

N4

M2

256

Base

64 64 64

64R

• . .

0300

384

Front

Storage

64 64 64

64

64R

* . *

0400

Expansion

(2879)

·Storage

Expansion (1802) Storage Jumper cards and Storage

Logic

card are

required

for

above

64K.

Notes:

1.

XX

= 19 (multiple modules) -This code does

not

indicate the failing module.

2.

Y = 8 - Customizing or undetermined storage error. Isolate to storage card.

3.

If

the card indicated

by

"Y"

does

not

exist in the

3274,

resear/replace card

P2

and

Q4

(Model 51

C),

or

card

M4

and N4 (Model 52C).

4. A repeating 0101 code Indicates a control storage card error code

of

0000.

1 Module for

each storage

position.

2 Modules

(stacked)

for

each position.

2 Modules

(stacked)

for

each position.

GGGBBB86G

0

E STORAGE

MODULES

"XX"

=-f

lGG8G88BB

0

000

Control

Storage

Card

32K

(Card

No.1)

GGGBBBBB80

~

STORAGE MODULES

"XX"

::1

188GGBBBB

0

ODD

Control

Storage

Card

64K

(Card

No.2)

Control

Storage

Card 64K·(R) (Card

No.3)

·When

XX =9

or

18,

the

failing

module

could

be

either

number

9

or

18.

Figure 2-5. Control Storage Card Layouts

Chapter 2. Subsystem Problem Isolation Procedure 2-7

Step 5 - Device Adapters -Driver/Receiver

a.

Category A Device Failure (one

or

all

devices fail)

(1)

(2)

(3)

Replace the type A tenninal adapter card No. 12

and driver/receiver card No. 28 (located in the

coaxial panel).

Reseat device A cable

AI-Zl

or Z3.

If

this

is

a new installation, a missing Device Ready

o

or

a missing Downstream Load D

on

a 3290

(in the Operator Information Area) may be caused

by customization response 112, 116, or 117

(number .of terminals attached).

(4) One device fails -

go

to

step c.

b. Category B Device Failure (one or

all

devices fail)

(1) Replace the type B terminal adapter card Nos.

24,

25, 26, and

27,

and driver/receiver card No. 30.

(2) Reseat device B cable

AI-Z2.

(3)

All

devices still fail. This could be caused

by

one

disabled Category B device. Perform step d (Device

Summary Status, Test 3);

if

line 2 (status

of

each

display) indicates one dash

(-),

isolate problem

to

that

3277 device.

(4) One device fails -

go

to

step c.

c. Device Problem Isolation -Category A or B Devices

(1) To determine the failing

3274

port location,

perform step e (Device Summary Status, Test 3), or

see the customer's Device Cable Attachment Form

to convert the failing network address (device)

to

the actual coaxial

port

location.

(2) Check the coaxial cable device for defects. Cables

to

the same type

of

device can be interchanged

(3278 for

3278,

3287 for 3287, etc.) to assist in

problem isolation. The coaxial port panel

is

shown

below.

Al-Z2

Al-Z3

• • • •

Type

B

Ports (4)

o

•

4

•

3

2 3

B

• •

5 6

A

• •

2

•

7

_____

Type

A

• Ports (8)

o

Coaxial Panel, Port Layout

(3) Check the internal device A and B cables for

defects, using Figure C-13 for A devices and Figure

C-18 for B devices.

2-8

d. Isolation Procedure for a Coax Problem

I

If

possible, exchange

the

suspected coaxial cable with

the cable

at

a known working

port

location. A device

POR

is

required, after the cables are interchanged, for

the control

unit

to recognize the change. For

~

display,

set the Normal/Test switch

to

Test, then back

to

Nonnal. (However,

on

a 3290 display, turn power off,

then on, and wait up

to

2 minutes.) To isolate a failing

display coaxial cable, verify

that

the Ready 0 symbol,

or Dsymbol for a

3290,

is

displayed.

Warning: When device cables are being exchanged and

the devices are different

or

the screen size

or

features are

not

the same, addressing problems may occur which can

affect system operation.

Retry the failing operation or run the Test 0 display

pattern. To run Test

0,

see 3274 Models 51C, 52C, alld

61CMaintenance Concepts, SY27-2528.

Notes:

1.

Perform Step

5,

d(

1)

and d(2) to isolate a cable

problem.

2.

It

is

possible to have unassigned Type-A ports

if

port

addresses were individually configured.

Run

the

/3

test, and

check

for

x in line

2.

See Step 5, item

e,

Example C

(1) Resistance Test

(to

attached device). See Figure

2-

6

8.

Note: The coax signal and shield

are

transfonner-

coupled

at

the device driver/receiver. Resistance

test applies to Category A terminals only.

Power does

not

have to be turned

off

on either

the

3274

or the attached device.

Disconnect the cable from the 3274 coax panel.

Measure the resistance from the center pin

of

the

connector,

on

the cable end, to the outer case

of

the connector.

Use

the R x

1·

range on the

meter. The presence

of

3274 driver/receiver

signals will

not

affect the test.

Is

the resistance between 1 and 250 ohms?

N

•

If

the resistance

is

too

high or

infinite, check for an open or a

faulty connection.

•

If

the

resistance

is

zero, check for

a signal-to-shield short.

Reconnect the cable at the 3274 coax panel.

Power does

not

have

to

be turned

off

at the 3274.

(2) Resistance Test (To 3274). See Figure 2-6,

O.

Disconnect the coaxial cable from the attached

device. Measure the cable resistance again,

but

at

the device cable end, using the R x 100 range

on

the meter.

..

_-

IBM 3274 51C Setup guide

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