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lynx 470 drive exerciser schematic?

wormey

New Member
Joined
Jul 24, 2021
Messages
9
Hi. I have recently acquired a Lynx 470, with manual and cables. It's in really good shape; the only problem is that it doesn't work. All the LEDs light up in test mode (I replaced the barely visible red ones with high efficiency ones, and a larger resistor to dim them a bit). The whole thing seems to have been hand-soldered, and was not cleaned of flux afterward.

Going through the test sequence in the manual, it won't make the drive seek. I found a bad 74LS85 comparator (first chip I looked at) but the other chips _appear_ to be working OK.

It would be a lot easier to troubleshoot this thing if I had a schematic. Does anyone know where I could find one?

Thanks,
Steve
 
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