Difference between revisions of "Troubleshooting"
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COMMODORE VIC20 COMPUTER - DIAGNOSTICS AND REPAIR | COMMODORE VIC20 COMPUTER - DIAGNOSTICS AND REPAIR | ||
| − | [ | + | [http://personalpages.tds.net/~rcarlsen/cbm/vic20/vic20.txt] |
LATEST VERSION CR BOARD: ASSY #250403 FAB #251040-01 REV D 1981/2 | LATEST VERSION CR BOARD: ASSY #250403 FAB #251040-01 REV D 1981/2 | ||
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[http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?f=11&t=7862&p=85291] | [http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?f=11&t=7862&p=85291] | ||
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| + | '''UB7''' 6560-101 VIC VIDEO/AUDIO | ||
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| + | Yellow screen, high pitched tone. Reset functions tone changed pitch. Avengers cartridge worked after multiple resets. With small memory expansion, random garble characters appeared on screen after rest. With large memory expansion, display ok. Wrong colours only. | ||
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| + | [http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?f=11&t=7892] | ||
Revision as of 01:45, 13 March 2016
COMMODORE VIC20 COMPUTER - DIAGNOSTICS AND REPAIR [1]
LATEST VERSION CR BOARD: ASSY #250403 FAB #251040-01 REV D 1981/2
UD7 901460-03 ROM CHARACTER
The characters are not displayed correctly indicates a ROM failure
UB7 6560-101 VIC VIDEO/AUDIO
Yellow screen, high pitched tone. Reset functions tone changed pitch. Avengers cartridge worked after multiple resets. With small memory expansion, random garble characters appeared on screen after rest. With large memory expansion, display ok. Wrong colours only.
