Defender ROM light

saltbreez

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Hey Guys,

I've got a Defender board set I just brought back to life. Everything appears to work, but...

The ROM board light, 3rd from the left [as the ribbon is on the bottom of the ROM board] stays on...

Any idea why?

Thanks,
Saltbreez
 
Does it blink when it is supposed to or is it on all the time? If it is on all the time check the inputs & outputs on on IC 21. The inverter may be stuck on. Otherwise it may be the PIA (IC22) is bad.

ken
 
Does it blink when it is supposed to or is it on all the time? If it is on all the time check the inputs & outputs on on IC 21. The inverter may be stuck on. Otherwise it may be the PIA (IC22) is bad.

ken

Bingo! Thanks Ken. It traces back to the PIA. The question now is: to replace or not replace the PIA.

Since the ROM board functions well over all, I am going to burn test and leave as is.

Saltbreez
 
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