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il ~ gj ~ Field Engineering
Diagram Manual

System/360 Model 40
2040 Processing Unit

SY22-2842-3
SY22-2842-3
FES: SY22-6827

PREFACE

This manual contains diagrams for use with System/360 Model 40 2040 Processing Unit, Field
Engineering Maintenance Manual, Order No. SY22-2841, and also with the following manuals:
System/360 Model 40 Comprehensive Introduction, Field Engineering Theory of Operation
Manual, Order No. SY22-2840.
System/360 Model 40 Functional Units, Field Engineering Manual of Instruction, Order No. SY22-2843.
System/360 Model 40 Theory of Operation, Field Engineering Theory of Operation Manual,
Order No. SY22-2844.
System/360 Model 40 Power Supplies, Features, and Appendix, Field Engineering Manual of
Instruction, Order No. S223-2845.
Power Supplies, SLT, SLD, ASLT, MST, Field Engineering Theory of Operation Manual, Order
No. SY22-2799. This manual may be used for maintenance or instruction purposes. It contains Data Flow
Charts, Simplified Logic Diagrams (SLD) , Condensed Logic Flow Charts (CLF), Malfunction Analysis
Procedures (MAP), and 1401/1460 Emulator Flow Charts.
The EC level of Control Automation System (CAS) Logic Diagrams referenced within this manual
is 255263. ALD references are at EC level 254814 for all diagrams except the 1401/1460 emulator
flow charts, which are at EC level 255264. The Mid-Pac power supply is at EC level 255055 and
the 2. 5 kHz HF Power Supply is at EC level 266316. Subsequent engineering changes may alter the con-
tents of this manual.

Fifth Edition (January 1970)
This manual, Order Number SY22-2842-3, is a reprint of Y22-2842-2 incorporating
changes released in FE Supplement Y22-6809, November 28, 1969.

Changes are continually made to the specifications herein; any such changes will be
reported in subsequent revisions or FE Supplements.

This manual has been prepared by the IBM Systems Development Division, Product
Publications, Dept B96, PO Box 390, Poughkeepsie, N. Y. 12602. A form for
readers' comments is provided at the back of this publication. If the form has been
removed, comments may be sent to the above address.