Victor 9000 User Manual

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SECTION FOUR ••• FAULT ISOLATION
POWER SUPPLY ••••••••••••••••••••••••••••••••••
COMPONENT FAILURE ....•.•...••.•...•••.•.
ADJUSTMENT AND CALIBRATION ......•.••..•.
4. 1
4. 1 • 1
4. 1. 2
VIDEO CONTROL BOARD .....•....•..•..•......••.. 4.2
COMPONENT FAILURE ....•••.....•••...•••.. 4.2.1
ADJUSTMENT.............................. 4.2.2
DISK DRIVE CONTROLLER •...•....•...•........•.. 4.3
SEEK LOGIC FAILURE ...............•.•.... 4.3.1
MOTORSPEED FAILURE ...•..••..•.......•..• 4.3.2
WRITE LOGIC FAILURE ...........•......... 4.3.3
READ CIRCUIT ANALYSIS •••.......•.•.....• 4.3.4
*CENTRAL PROCESSOR BOARD •...•....•..•....•....
* 8088 OR BUS CONTROL FAILURE ..•.........•
* MEMORY FAULTS ................•.....•••..
* INTERRUPT CIRCUIT ANALYSIS .........•...•
*CRT INTERFACE FAILURE .............•..••.
* SERIAL PORTS ....•.......•...........•...
*PARALLEL PORT FAILURE •.............•...•
* CODEC ...•.......•.................•••...
4.4
4. 4. 1
4.4.2
4.4.3
4.4.4
4.4.5
4.4.6
4.4.7
*KEYBOARD FAILURE .........•.•.•........••....• 4.5
MEMORY EXPANSION BOARD FAILURE ..•.....••....• 4.6
SECTION FIVE •••• CORRECTIVE MAINTENANCE
DISK DRIVE REPAIR .......••••.•..•••...•...•.. 5.1
* PCB REPAIR................................... 5.2
* KEYSWITCH REPLACEMENT ........•.......•....... 5.3
SECTION SIX •••• PARTS CATALOG & SCHEMATICS
* ILLUSTRATED PARTS CATALOG.................... 6.0
SYSTEM SCHEMATICS ...................•........ 6.1
* DENOTES TO BE RELEASED
II

Victor 9000 Specifications

General

Processor	Intel 8088
Clock Speed	4.77 MHz
RAM	128 KB, expandable to 896 KB
Operating System	MS-DOS
Floppy Drive Capacity	1.2 MB per drive
Display	Built-in monochrome display
Text Resolution	80 x 25 characters
Graphics Resolution	800 x 400 pixels
Ports	Parallel, serial, video output