IBM 3274 User manual

Systems
GA27-2850-7
File No. 5360/5370/53/4300/8100-09
IBM 3274 Control Unit
User's Guide
Section 1. Operator Information
Section 2. Problem Determination
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Eighth Edition (August 1985,
This major revision obsoletes GA27·2850·6. Much of this guide has been
reorganized
and rewritten.
References in this--publication to IBM products, programs, or services do nat
imply that IBM intends to make these available in all countries in which IBM
operates. Any reference
to an IBM program product in this publication is not
intended to state or imply..that only IBM's program product may'be used. Any
functionaHy
equivalent program may be used instead.
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52Q, Kingston, N.Y., U.S.A. 12401. IBM may use or distribute whatever
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any obligation to you.
© Copyright
International Business Machines Corporation 1978, 1985

Preface
This manual contains 3274 operator reference information and
3274 subsystem problem determination procedures. It is
intended for the operator of the IBM 3274 Control Unit and for
the person who does problem determination.
For the purposes of this manual, the 3274 subsystem consists of
a 3274 Control Unit, attached 3299 Terminal Multiplexer units,
and attached printers and display stations.
Organization of Manual
This manual has two sections:
• Section 1, "Operator Information," briefly describes the
various models of the 3274 Control Unit, discusses the care
and use of diskettes, and identifies and describes the
functions of the various switches and indicators (lights) on
the 3274 operator panel. The switches and indicators on a
3274
operator panel are model- and feature-dependent;
therefore, you must select the appropriate figure in the
guide when reviewing this type of data about your 3274.
In addition, this section explains:
The Encrypt/Decrypt feature, which can be installed in
the 3274 ModellC, 2lC, 3lC, 4lC, 5lC, or 6lC
The 3274 Dial-Up telephone facilities
The /3 Test (status summary display test), which you
use to obtain statistical information about the various
elements of your 3274 subsystem.
• Section 2, "Problem Determination," contains an overview
of problem determination from a subsystem perspective,
Preface
III

followed by a symptom index chart that will sometimes
isolate your problem directly and, at other times, lead you
to strategic points in detailed problem determination
procedures. The problem determination strategy starts at
the attached devices and progresses toward the 3274
Control Unit.
How to Do Problem Determination
The person responsible for problem determination should
become familiar with the concepts and facilities described in
this manual and, once familiar with them, be able to use
Section 2 for problem determination when a problem occurs.
The problem determination procedures ask you specific
questions and instruct you to take certain actions and to
record the results on the 3274 Control Unit Problem Report
Form, GX23-0203. A sample
of this form is given in Figure 2-2
on page 2-52. In some cases, the procedures tell you to perform
problem
determination on one of the devices attached to your
3274 directly, or on devices attached to your 3274 via a 3299.
Be
sure you have a copy of the problem determination guide
for
each type of device attached to your 3274 Control Unit (see
"Related Publications" for publication order numbers).
Related Publications
• Following is a list of problem determination guides
that you may need:
IV
IBM 3178 Display Station Operator Reference Guide,
GA18-2128
IBM 3179 Color Display Station Operator Guide,
GA18-2180

IBM 3180 Display Station Modell User's Guide,
GA21-9468
IBM 3230 Printer Model 2 Operator's Guide, GA24-3767
(includes problem determination procedures)
IBM 3262 Printer Models 3 and 13 Operator Instruction
and Status Codes, GA24-3752
IBM 3268 Printer Model 2 Operator's Guide, GA27-3270
IBM 3270 Personal Computer Maintenance Information,
SY27-2567 (PN 1837436)
IBM 3270 Personal Computer Hardware Problem
Determination, GA23-0233
IBM 3270 Personal Computer Attachment User's Guide,
SA23-0169
IBM 3278 DisplffY Station Problem Determination
Guide, GA27-2839
IBM Personal Computer 3278/3279 Emulation Adapter
Installation/ Problem Determination Guide,
PN 6936421
IBM 3279 Color Display Station Problem Determination
Guide, GA33-3051
IBM 3287 Printer Models 1 and 2 Problem
Determination Guide, GA27-3151
IBM 3287 Printer Models 1C and 2C Problem
Determination Guide, GA27-3231
IBM 3289 Line Printer Models 1 and 2 Error Recovery
and Problem Determination Guide, GA27-3141
IBM 3290 Information Panel Customer Problem
Analysis and Resolution, GA23-0125 (U.S. and Canada)
Preface V

IBM 3290 Information Panel Problem Determination
Guide, GA23-0126 (WT
except Canada)
IBM 3299 Terminal Multiplexer Customer Problem
Analysis and Resolution, GA23-0142 (U.S.
and Canada)
Note: You should also have a copy of the IBM 3270
Information Display System: Reference Summary,
GX20-1878-5 or higher. This document contains
abbreviated problem determination procedures in
regard
to 3274 status and nnn codes. The primary
source
of information for the Reference Summary is
the 3274
Control Unit Description and
Programmer's Guide, GA23-0061.
• Besides the 3274 Problem Report Form, GX23-0203, you
may also need:
VI
IBM Repair Authorization Form, GX24-3762
IBM 3262 Printer Models 3 and 13 Trouble Report
Form, GX24-3749
IBM 3268 Printer Models 1 and 2 Operator's Trouble
Report Form, GX27-2937
IBM 3275/3277 Trouble Report Form, GX23-0202
IBM 3276/3278/3279 Problem Report Form, GX23-0201
IBM 3284/3286/3288 Trouble Report Form, GX23-0204
IBM 3287 Printer Models 1 and 2 Operator's Trouble
Report, GX27
-2923
IBM 3287 Printer Models 1C and 2C Operator's Trouble
Report Form, GX27-2931

IBM 3289 Line Printer Models 1 and 2 Operator's
Trouble Report Form, GX27-2922
IBM 4250 Printer Trouble Report Form, GX33-l503
• Other publications you may need are:
3270 Facility Error Recognition System (FERS) Service
Aid Description, G229-703l
OS/VS Display Exception Monitoring Facility (DEMF)
User's Guide, GC34-2003
Network Problem Determination Application Error
Messages Manual, SC34-2012
Network Problem Determination Application Terminal
Use Guide, SC34-2013
DOS/DIGS User's Guide, G229-7030
OS/GIGS User's Guide, G229-7029.
Problem determination procedures for the IBM 3271 and 3272
Control Units, IBM 3275 and 3277 Display Stations, and IBM
3284, 3286, and 3288 Printers are described in the IBM 3270
Information Display System: Problem Determination Guide,
GA27-2750, and are purposely pot included in this publication.
Problem determination procedures for an IBM 3276 Control
Unit Display Station with its attached devices are described in
the IBM 3270 Information Display System: System Problem
Determination for 3276 Control Unit Display Stations,
GA18-2042, and are purposely not included in this publication.
Preface Vll

Contents
Section 1. Operator Information 1-1
Introduction 1-1
3274 Diskettes 1-3
Care of Diskettes 1-4
Diskette Shipping and Receiving 1-6
Diskette Long-Term Storage 1-6
Inserting a Diskette into a 3274 Model lA, lB, lC, ID, 2lA, 2lB, 2lC, 21D,
31A, 31C,
or 3ID 1-6
Removing a Diskette from a 3274 Model lA, lB, 1C, 1D, 21A, 2lB, 2lC, 21D,
31A, 31C,
or 3ID 1-11
Inserting a Diskette into a 3274 Model 41A, 41C, or 41D 1-12
Removing a Diskette from a 3274 Model 41A, 41C, or 41D 1-14
Inserting a Diskette into a 3274 Model 51C or 61C 1-15
Removing a Diskette from a 3274 Model 51C or 6lC 1-17
3274 Operator,Panels (Figures 1-7 through 1-15) 1-18
3274 Encrypt/Decrypt Feature 1-35
Battery Replacement-Models lC, 21C, 3lC, 4lC, 51C, and 61C 1-36
Entering a Master Key Code 1-38
Verifying the Master Key Code 1-41
Encrypt/Decrypt Feature Test 1-43
3274 Dial-Up Telephone Facilities 1-47
DialOperation 1-47
Dial Operating Procedures 1-49
Sending Message Data to the Host System 1-49
Receiving Message Data from the Host System 1-53
/3 Test (Status Summary Display Test) 1-57
Section 2_ Problem Determination 2-1
Introduction 2-1
Overview of Subsystem Problem Determination 2-2
Problem Determination Levels 2-2
Problem Determination Facilities 2-3
Start Here to Isolate Your Subsystem Problem 2-4
Preliminary Checks 2-4
Symptom Table 2-5
3299 Service/Replacement Procedure 2-6
Problem Determination Procedures 2-7
Contents IX