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9020
HP 9020 User Manual
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4-10
Assembly
Access
2.
Pull
both
display
latches
toward
front
of
computer,
unlatching
display
from
support
legs
(Figure
4-7).
*
*
DISPLAY
LATCH
Figure
4-7.
Unlatching
Display
WARNING
THE
DISPLAY
MAY
BE
HEAW.
TO
AVOID
PERSONAL
INJURY
OR
DAMAGE
TO
EQUIPMENT,
TWO
PEOPLE
MAY
BE
REQUIRED
TO
LIFT
THE
DISPLAY
(FIGURE
4-8).
*
109
111
Table of Contents
Default Chapter
5
Table of Contents
5
Chapter 1. General Information
17
Introduction
17
Description
18
Computer Service Documentation
18
Warnings, Cautions, and Notes
19
Repair Philosophy
20
Ac Componentsnoltage Conversion
20
Ac Componentsn Oltage Conversion
20
Safety
21
General Safety Procedure
21
Safety Guidelines for High-Voltage Testing
21
Grounding Requirements
22
Printer Paper Loading
22
Flexible Disc Media
23
Computer Cleaning
24
Case
24
Air Intake Grill
24
9130K Flexible Disc Drive Cleaning
24
Chapter 2. Theory of Operation
27
Introduction
27
Computer Block Diagram
28
Computer Interconnection Diagram
29
Power Supply Assembly
30
Ac Module
32
Primary Board
32
Secondary Board
32
Supervisor Board
33
Status Leds
34
Power Diagrams
34
Voltage Sensing Diagram
36
Safety Grounding Diagram
37
Processor Stack
38
Stack Configurations
38
Processor Stack Block Diagram
39
Stack Boards
40
Stack Motherboard
41
Clock Board
41
Power Interlock Switch
41
Cooling
41
Memory
41
Memory Organization - 256K Byte RAM
41
Memory Mapping
42
Memory Healing
45
Memory Organization - 512K Byte RAM Board
46
Memory Mapping
48
Memory Organization - 1 Megabyte RAM Board
51
Memory Organization
51
Megabyte Memory Organization
51
Megabyte Memory Mapping Operation
52
Memory Healing
53
Megabyte Memory Healing
54
Lop Bus
55
Keyboard
56
Lop Bus Interface
57
Miscellaneous Status and Control
57
Keyboard Block Diagram
57
Keyboard and Input Device Scanning
58
Beeper
59
Power-Up/Power-Down Sense Circuitry
59
Display
60
98770A and 98780A Display Interface Module (DIM)
60
Display Interface Module (DIM)
61
98760A Standard Color Graphics Display
63
Alpha/Interface Board Block Diagram
64
Graphics/Digital Video Board Block Diagram
65
Thermal Printer
67
Logic Board
67
Motor Drive Board
70
Paper Sensor Board
71
Printhead Interconnect Board
71
Printer Operation
71
Mass Storage
72
9130K Flexible Disc Drive Controller Card
73
Flexible Disc Drive Controller Card Block Diagram
73
Winchester Fixed Disc Drive Lid Card
74
Winchester Fixed Disc Drive I/O Card Block Diagram
75
Motherboard
76
Power Supply
76
Processor Stack
76
Fans
76
Mass Storage
76
Printer and Keyboard
77
Display
77
Mass Storage Bus
77
Bootstrap Loader Card
78
Boot Loader ROM
78
Reserved Bus
79
Bootstrap Loader Card Block Diagram
79
Chapter 3: Testing and Troubleshooting
83
Introduction
83
Troubleshooting and Repair Strategy
83
Hp-Cio
83
Power-Up Sequence
84
Repair
85
Problem Isolation
85
Self-Tests and Diagnostics Overview
86
Self-Test Supervisory Code
86
System Functional Tests
86
Module Self-Tests
86
Power Supply
87
Processor Stack
87
Module Self-Tests
87
Printer
89
Keyboard
89
Display Interface Module (DIM)
89
98760A Standard Color Graphics Display
89
98770A High Performance Color Graphics Display
89
98780A Monochromatic Display
90
9130K Flexible Disc Drive/Controller Card
90
Winchester Fixed Disc Drive/Controller Assembly
90
Bootstrap Loader Card
90
Self-Test Supervisory Code
91
Internal I/O Bus
91
Memory
91
Printer
92
Keyboard
92
Display Interface Module (DIM)
92
98760A Display Alpha and Graphics
92
9130K Flexible Disc Drive/Controller Card
92
Winchester Fixed Disc Drive/Controller Assembly
92
System Functional Tests
93
98760A Display Color Alignment
94
Overview of Alignment Process
94
When Needed
94
Required Equipment
94
Test Conditions
94
Overview of the Alignment Process
94
How It Works
95
The Intensity Adjustment Procedure
95
Video Board Pots and Test Points
95
Sweep Board Adjustments
96
Early Warning/Fault Tolerance
97
Overtemperature
97
Memory Errors
97
Real-Time Clock/Non-Volatile Memory (RTC/NVM)
98
Chapter 4. Assembly Access
101
Introduction
101
General Safety Procedures
102
Electrostatic Discharge
102
Case Parts
104
Side Doors
104
Opening Side Door
105
Front Cover, Including Keyboard Bezel
106
Removing Side Door
106
Removing Keyboard Bezel
107
Rear Cover, Including Display
109
Unlatching Display
110
Lifting Display
111
Removing Rear Cover
111
Replaceable Assemblies
112
9130K Flexible Disc Drive Controller Card
113
Removing Mass Storage Cover
113
Removing Flexible Disc Drive Controller Card
114
Winchester Fixed Disc Drive Controller Assembly
115
Removing Fixed Disc Drive Controller Assembly
115
Bootstrap Loader Card
118
Processor Stack
118
Removing Processor Stack Door
121
Disconnecting Lop Cables
122
Removing Processor Stack Clock Board
124
Removing Processor Stack Cover Plate
125
Disconnecting Processor Stack Fan Cable
126
Removing Processor Stack
126
Display
127
Display Interface Module (98770A or 98780A Displays)
128
Removing DIM
129
Display Alphalinterface Board (98760A Display)
130
Display Lid
131
Removing Lid
131
Keyboard
132
Removing Keyboard
133
Printer
136
Keyboard Language Resistor Configurations
136
Removing Printhead
140
Removing Printhead Interconnect Board
143
9130K Flexible Disc Drive
147
Removing Flexible Disc Drive
148
Winchester Fixed Disc Drive
151
Removing Fixed Disc Drive
152
Power Supply Assembly
154
Power Cord
157
Removing Power Supply Assembly
157
Ac Module
159
Removing Ac Module
160
Line Filter
161
Removing Display Connector Assembly
161
Removing Ac Module Cover
162
Disconnecting Line Filter Wires
163
Removing Power Switch Assembly
164
Processor Stack Fan
165
Power Supply Fan
166
Motherboard
172
HP 98760A Standard Color Graphics Display
174
Exchange Parts
196
Non-Exchange Parts
197
Product Support Tools
197
Extender Board
198
Product Support Documentation
198
HP Printer Replacement Paper
199
Covers Parts List
201
Chassis Components Parts List
202
Printer Parts List
205
Processor Stack Parts List
207
AC Module Parts List
210
Winchester Fixed Disc Drive Parts List
211
Flexible Disc Drive Parts List
212
Keyboard Parts List
213
Motherboard Signal Definitions
230
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HP 9020 Specifications
General
Brand
HP
Model
9020
Category
Desktop
Language
English
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