When powered on the display is dark and disk motor spins
continuously. Possible Power supply problem.
Checked positive and negative 12 volt regulators, both
check good.
Checked positive and negative 5 volt regulators, the
negative was good but the positive 5 volt was outputting zero volts. So I checked
the input to the regulator. It was suppose to be 13 volt but it was sitting at
1.2 volts. So it's not the regulator, it the input to the regulator.
I traced the input
leg back, and I found a bad 1 ohm resister. (R312) was open. Replaced resistor
and problem was fixed.
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