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Model 8904A Contents
CONTENTS
Section
6
.
Replaceable Parts
Introduction to This Section
............................................
6.1
Reference Designations and Abbreviations Used in This Manual
........................
6.1
Replaceable
Parts
List
................................................
6.1
Ordering Parts
...................................................
6.1
Replaceable Parts List Updating (Manual Updates)
.............................
6.2
Mechanical and Chassis
Part
Locations and Reference Designations
......................
6.2
Section
7
.
Instrument Changes
Introduction
to
This Section
............................................
7.1
Option Conversions
..................................................
7.1
Instrument Modifications
..............................................
7.1
Firmware Updates (A2U12 and A2U13)
....................................
7.8
Hardware Modifications
.............................................
7.8
Modification for Possible Ground Wire Shock Hazard
............................
7.9
Modification for Output Overvoltage Protection Improvement
.......................
7-13
Modification for Potential Power Supply Short
...............................
7-14
Section
8
.
Service
Introduction to This Section
............................................
8.1
How the Section is Organized
............................................
8.1
Safety Considerations
................................................
8.1
Before Applying Power
.............................................
8.1
Safety
.......................................................
8-1
Service Tools, Helps, and Information
.......................................
8-3
Printed Circuit Board Extractor
........................................
8.3
Assembly, Parts. and Cable Locations
.....................................
8.3
Other Service Documents
............................................
8.3
Recommended
Test
Equipment and Accessories
...............................
8.3
Schematic Symbology and Schematic Diagram Notes
...............................
8.3
Principles of Operation
..............................................
8-15
Overall
.....................................................
8-15
A2
Digital Assembly
..............................................
8-23
A3 Output Assembly (Service Sheets
1
through
4)
.............................
8-24
Troubleshooting
..................................................
8-29
General
.....................................................
8-29
A2
Digital Assembly to A3
(or
A10) Output Assembly Interface
......................
8-30
A2
Digital Assembly to
A1
Keyboard Assembly Interface
.........................
8-38
A2
Digital Assembly
to
A5 Display Assembly Interface
...........................
8-41
A3
or
A10 Output Assembly
.........................................
8-42
reu.200CT88