[Packet] fpllow up to question on KPC-2

[John Hagle]

I found the trouble. It was a bad electrolytic capacitor. C3, a 
4.7mfd at 35VDC.

It showed signs of a little bit of overheating. It was pressed up 
against an 7905 voltage regulator. That may have contributed to its 
failure. That cap acts as a ripple filter on the negative 12.5volt line 
to the 7905 regulator input. That voltage was down to around 10.45 VDC, 
and the result was that the KPC-2 didn't work as described before.

It was a little frustrating because I mislead myself into thinking the 
regulated circuits were okay because the negative 5 volts was right on 
the money. But with the regulator input filtering being bad, the raw 
-12.5volts was way off spec.

73

de N2JH

ps: I hope this may help someone else someday.