clindsey@nmsu.edu (Coy Lindsey) (12/14/90)
I just got my A3000 and has worked great (except improperly seated expansion bus card causing yellow screen and no boot) but I do have flicker in interlaced productivity mode. I have tweeked the fine adjustment pot all the way to the end of the pot but cannot get rid of the flicker. The books says that there is a coarse video adjustment but that it should be made by an authorized service center. In looking at the schematics (magnifying glass in hand) I found a variable cap VC470 that is part of the same circuit as the fine adjustment pot (VR470). Is this the coarse adjustment? Can I just tweek it or does the coarse adjustment require specialized test equipment? If its just visual, I can tweek just as well as the next guy. Thanks for any useful info Coy Lindsey
hood@cbmvax.commodore.com (Scott Hood) (12/15/90)
In article <CLINDSEY.90Dec13094746@tecate.nmsu.edu> clindsey@nmsu.edu (Coy Lindsey) writes: >I just got my A3000 and has worked great (except improperly >seated expansion bus card causing yellow screen and no boot) but I do >have flicker in interlaced productivity mode. I have tweeked the fine >adjustment pot all the way to the end of the pot but cannot get rid of >the flicker. The books says that there is a coarse video adjustment >but that it should be made by an authorized service center. In >looking at the schematics (magnifying glass in hand) I found a >variable cap VC470 that is part of the same circuit as the fine >adjustment pot (VR470). Is this the coarse adjustment? Can I just >tweek it or does the coarse adjustment require specialized test >equipment? If its just visual, I can tweek just as well as the next >guy. > > >Thanks for any useful info > >Coy Lindsey The A3000 display enhancer does not display enhance the interlaced-productivity display modes, only the interlaced or non-interlaced display modes. The ECS display modes, such as SuperHires and Productivity (interlaced or not) are special display modes that the display enhancer does not improve. Thus the fine or coarse tuning adjustments do not affect these display modes, i.e, don't mess with them. Regards, Scott Hood -- -- Scott Hood, Hardware Design Engineer (A3000 Crew), Commodore-Amiga, Inc. {uunet|pyramid|rutgers}!cbmvax!hood hood@cbmvax.cbm.commodore.com "The views expressed here are not necessarily those of my employer!"