HP 9020 - Replaceable Parts; Exchange Parts; Parts List; Printer

viii
Figures
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
2-13
2-14
2-15
2-16
2-17
2-18
2-19
2-20
2-21
2-22
2-23
2-24
2-25
2-26
3-1
3-2
3-3
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
Computer Block Diagram
............................................... " 2-2
Computer Interconnection Diagram
...................................... " 2-3
Power Supply Assembly Block Diagram ................................... " 2-5
Power Distribution Diagram ............................................. " 2-9
Voltage Sensing Diagram
................................................ 2-10
Safety Grounding Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 2-11
Processor Stack Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-13
256K
RAM Finstrate Block Diagram ....................................... 2-16
256K Memory Mapping
Organization ...................................... 2-17
256K Memory Mapping
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-18
256K Memory Healing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 2-20
512K
RAM Board Block Diagram ......................................... 2-21
512K Memory Mapping
Organization ...................................... 2-22
512K Memory Mapping
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-23
512K Memory Healing
.................................................. 2-24
1 Megabyte Memory Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-25
1 Megabyte Memory Mapping
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-26
1 Megabyte Memory Healing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 2-28
Keyboard Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 2-31
Display Interface Module
(DIM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-35
Alpha/Interface Board Block Diagram
..................................... 2-38
Graphics/Digital Video Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 2-39
Printer Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-42
Flexible
Disc Drive Controller Card Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . .. 2-47
Winchester Fixed
Disc Drive I/O Card Block Diagram . . . . . . . . . . . . . . . . . . . . . . .. 2-49
Bootstrap Loader Card Block Diagram
.................................... 2-53
Power-up Sequence ................................................... " 3-2
Video Board
Pots and Test Points ......................................... 3-13
Sweep Board Adjustments ............................................... 3-14
Side Doors ........................................................... " 4-4
Opening Side Door .................................................... " 4-5
Removing Side Door
..................................................... 4-6
Removing Keyboard Bezel
.............................................. " 4-7
Releasing Front Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 4-8
Removing Front Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 4-9
Unlatching Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 4-10
Lifting Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 4-11
Removing Rear Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 4-11
Opening I/O Door ...................................................... 4-12
Disconnecting
I/O Cable ................................................. 4-12
Removing Mass Storage Cover
........................................... 4-13
Removing Flexible
Disc Drive Controller Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-14
Removing Fixed Disc Drive Controller Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-15
Disassembling Fixed
Disc Drive Controller Assembly, View 1 .................. 4-16
Disassembling Fixed
Disc Drive Controller Assembly, View 2 .................. 4-17
Removing
Upper Board, View 1 .......................................... 4-18
Removing
Upper Board, View 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-19