Re: Apple IIpluse motherboard test results

["Vince Briel" <vbriel@yahoo.com>]

> I fno beep: Connect a keyboard and press RESET (or Ctrl-Reset). Use a
> voltmeter or bicyle lamp to check the voltage on the /RESET line. It
> should go low immediately after power-on or when RESET is pressed, and
> high a few miliseconds afterwards. If not, one of the 555s or its
> inverter transistor is dead. Or the electrolytic cap connected to it.
> 
> 
> Patrick


Ok, I tested 5V on pin 8 of 6502 and only show 3V with a known working
P/S.  The reset pin 40 pulls low 0V when reset is pressed, but also only
shows 3V.

Why only 3V to the cpu?  I have used this p/s on other ][plus' no
problem.  I tested p/s voltages and get all the proper +5V, +12V, -5V,
-12V, so I think its in the voltage regulation?

Where should I check next?


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