Apple powermac 8500 series Service Manual

 

 Troubleshooting

Symptom Charts/Video 

 

 (Continued)

 

 - 15

 

Video display 

distorted on Power 

Macintosh 8500 with 

DAV card installed

Symptom occurs when an add-in card attached to the DAV 

connector requires a mode configuration under which the add-in 

card controls most of the signal lines (Mode 2). Verify that the 

logic board installed supports DAV cards; if not, replace the logic 

board.

If the logic board in question meets 

 

 of the following criteria, 

then it DOES support DAV cards and you need not replace the board: 

• Part number 820-0752 is silk-screened on the logic 

board.

• The Logic board has the wiring scenario shown on the next 

page.