HP 340 Series Service Manual page 10

Hewlett-Packard Support ..................................................... 19
Repair Philosophy ....................................................... 19
HP Repair Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 19
Repair by Customers ................................................... " 19
Operating Systenls Support ............................................. " 20
Chapter 2: Assembly Replacement
Introduction ............................................................... " 21
Tools Required .......................................................... 21
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 22
Electrical ............................................................... 22
Electro-Static Discharge .................................................. 22
Mechanical ............................................................ " 23
Helpful Hints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 23
RenlOval Sequences ..................................................... " 23
Reference Diagram ..................................................... " 25
Proced ures ................................................................ " 28
Overview ............................................................... 28
DIO-1 Accessory Cards ................................................... 28
Case ................................................................... 29
Case or Front Panel Replacenlent ........................................ "
30
Fuse .................................................................... 31
Rear Panel ............................................................ " 31
Power Supply ........................................................... 32
Video/Graphics Boards ...................................................
34
LGn Interface Board ..................................................... 36
R,AM Boards .......................................................... " 37
DIO-I Slot ............................................................ " 38
SPU Backplane ........................................................ " 39
ThinLAN Board ....................................................... " 40
AUI LAN Board ....................................................... " 41
Processor Board ....................................................... " 41
Chapter 3: Functional Description
Hardware Overview ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
43
Processor Board ....................................................... "
43
Meillory ................................................................ 43
Video / Graphics ........................................................ " 44
System Interfaces ...................................................... " 44
Power Supply ............................................................... 45
Processor Board ............................................................. 47
Overview ........................................... "................... 47
Central Processing Unit .............................. ' .................. " 47
Co- Processor ........................................................... " 49
Boot ROMs and Self-Test LEDs ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 49
I/O BllS .............................................................. " 49
Direct Memory Addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 49
Processor Board Interfaces .............................................. " 50
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