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Field Engineering
Maintenance Manual

For Sale Through IBM Branch Offices

We are pleased to send you this ~om
plimentary copy o~.a newly '!rmted
publication. Addltl0!1al. copies are
available from the DistributIOn Cen-
pnODUCT "~
ter, Mechanicsburg.
PUBLICATIONS

G. W. Goesch, Manager
Department G24

Author: J. A. Wilson

Data Acquisition and Control System

SY26-5956-6
Field Engineering
Maintenance Manual

For Sale Through IBM Branch Offices

TI@@@ Data Acquisition and Control System

SY26-5956-6
Preface

This manual contains maintenance information for the contain information required to service those units. Other
following units of the IBM Data Acquisition and Control manuals that are used in servicing the 1800 system are listed
System: in the IBM Field Engineering Bibliography, 1800 Data
Acquisition and Control System (Order No. SY26-0560).*
IBM 1801 and 1802 Processor-Controllers It is assumed that the user of this manual is familiar with
IBM 1803 Core Storage Unit 1800 system programming techniques and that he under-
IBM 1826 Data Adapter Unit stands the functional and operational aspects of all system
IBM 1828 Enclosure areas. Hexadecimal numbers, if not otherwise identified,
IBM 1851 Multiplexer Terminal are preceded by a "slash" (e.g., /3000) to distinguish them
IBM 1856 Analog Output Terminal from decimal numbers.
Service Aids included in this manual are 24,25,35,44,
The data processing input/output units used in the 1800 65,66,69, 129, 134, and 172.
system are provided with separate maintenance manuals that

*Manuals referred to in this publication that have an Order No.
with a four character prefix are identical in content to the same
manual without the initial prefix character. (e.g. SY26-xxxx is
the same in content as Y26-xxxx.)

Seventh Edition (February, 1970)

This manual (Order No. SY26-5956-6) is a complete revision of, and makes obsolcte,
Order No. SY26-5956-5. Changes to the text, and small changes to illustrations, are
indicated by a vertical line to the left of the change; changed or added illustrations
are denoted by the symbol. to the left of the caption.

Significant changes or additions to the specifications contained in this publication are
continually being made. When using this publication in connection with the operation
of IBM equipment, check the latest FE publications Systems Sequence Listing, Order No.
SY20-0073, for revisions or contact the local IBM Branch Office.

The illustrations in this manual have a code number in the lower corner. This is a
publishing control number and is not related to the subject matter.

Copies of this and other IBM publications can be obtained through IBM Branch Offices.

A form for reader's comments is provided at the back of this publication. If the form
has been removed, send your comments to the address below.

This manual was prepared by the IBM Systems Development Division, Product
Publications, Department G24, San Jose, California 95114.

ii (2/70)
Contents

<>"
Safety.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. vi 1.7 CORE STORAGE.. . ... ... .... .... ...... 1-40

Abbreviations ..................................... viii 1.7.1 Collection of Error Data . . . . . . . . . . . . . . . . . . 1-40

CHAPTER 1. REFERENCE DATA AND DIAGNOSTIC 1.7.2 Main Storage Addressing and Selection ...... 1-41
TECHNIQUES ........................ 1-1
1.7.3 Core Storage Display Procedure ............ 1-42
Section 1. Reference Data . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1
1. 7.4 Scoping Techniques ..................... 1-43
1.1 LOGIC DIAGRAMS ..................... 1-28
1.7.5 Swapping BSM Address Assignments ........ 1-44
1.1.1 ALD Logic Block Symbology. . . . . . . . . . . . . . 1-28
1.7.6 Array Swapping (Physical) ................ 1-44
1.1.2 FEALD Logic Block Symbology. . . . . . . . . . . . 1-28
1.7.7 Trouble Diagnosis ...................... 1-44
1.1.3 Machine Frame and Gate Designations ....... 1-28
1.7.8 Core Storage Waveforms . . . . . . . . . . . . . . . . . . 1-53
1.1.4 Logic Page Identification. . . . . . . . . . . . . . . . . . 1-29
1.7.9 Current Measurement .................... 1-53
1.1.5 System Paperwork Binder . . . . . . . . . . . . . . . . . 1-30
1.8 PROCESS INPUT/OUTPUT. . . . . . . . . . . . . . . 1-53
1.2 MANUALL Y CONTROLLED WIRING
CHANGES ............................ 1-30 1.8.1 Analog Input .......................... 1-53

1.2.1 Authorization for Wiring Changes .......... 1-32 1.8.2 Analog Input Waveforms ................. 1-55

1.2.2 Data Channel Assignment. . . . . . . . . . . . . . . . . 1-32 1.8.3 Multiplexer Troubleshooting Techniques ..... 1-57

1.2.3 Timer Interval Reassignment. . . . . . . . . . . . . . . 1-33 1.8.4 1851 Service Voltages ................... 1-60

1.2.4 Interrupt Assignments ................... 1-33 1.8.5 Programming Rules and Restrictions ........ 1-60

1.2.5 System/360 Adapter Address Reassignment. . . 1-34 1.8.6 Analog Inpu t Repeatability ............... 1-61

1.2.6 Communications Adapter and Line 1.8.7 Analog Ou tpu t 1-62
Adapter .............................. . 1-34
1.9 DATA PROCESSING INPUT/OUTPUT...... 1-62
1.2.7 Editing Diagnostic Programs . . . . . . . . . . . . . . . 1-35
1.9.1 DP I/O Trouble Diagnostic ................ 1-62
Section 2. Diagnostic Techniques ..................... 1-35
1.9.2 1442 Card Read Punch ., . . . . . . . . . . . . . . . . . 1-62
1.3 ON-LINE SERVICING LIMITATIONS. . . . . . . 1-35

1.3.1 Use of Auxiliary Storage. . . . . . . . . . . . . . . . . . 1-35 CHAPTER 2. CONSOLE AND MAINTENANCE
FEATURES .......................... 2-1
1.3.2 Power Removal and Component Plugging. . . . . 1-35
2.1 PROGRAMMER'S CONSOLE ............. 2-1
1.3.3 Channel Termination. . . . . . . . . . . . . . . . . . . . . 1-36
2.1.1 Switches and Message Lamps .............. 2-1
1.3.4 System/360 Adapter. . . . . . . . . . . . . . . . . . . . . 1-36
2.1.2 Toggle Switches 2-4
1.4 MARGINAL CHECKING. . . . . . . . . . . . . . . .. 1-36
2.1.3 Indicator Lamps 2-4
1.5 SLT MAINTENANCE. . . . . . . . . . . . . . . . . . . . 1-37
2.1.4 Register Display Lamps and Switches ....... 2-6
1.5.1 SLTContactWear ....................... 1-37
2.2 INITIAL PROGRAM LOAD (IPL) .......... 2-6
1.5.2 Wire Color Codes ....................... 1-37
2.2.1 1442 Standard IPL Procedure 2-6
1.5.3 Machine Cable Installation ................ 1-37
2.2.2 1054 Standard IPL Procedure 2-7
1.6 CRITICAL CIRCUITS AND LEVELS ....... 1-38
2.2.3 IPL into Any Core Location 2-7
1.6.1 Sample Pulse Drivers (SPD's) .............. 1-38
2.3 ERROR CIlECK CIRCUITS 2-7
1.6.2 Singleshots (SS) ........................ 1-38
2.4 MAINTENANCE DIAGNOSTIC
1.6.3 Phase A/B ............................. 1-38 PROGRAMS .......................... 2-8

1800 FEMM (2/70) iii
2.4.1 Program Tests . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 4.1.1 Indicator Lamp Removal/Replacement ...... 4-1

2.4.2 Documentation . . . . . .