On my Corsair II the microprocessor and the crystal were both okay, it was the
electrolytic capacitor used to boot the microprocessor at power up that had
drained itself dry mounted on the pcb.
I could hear the crystal oscillating with an external receiver and a make shift
probe but had no activity at the mpu.
>If you buy a Crystal, then I'll bet you $5 it's the cpu! (hi) >
>> As power is applied, be it from activation of the switch on the front >panel
>> or from the power supply, there is a reset pulse generated by the >timing
>> cap and resistor that resets the microprocessor, but only after the
>> >operating parameters are loaded. In other words, the MP starts with a
>> clean >load of data. >> >> Bob, K4TAX
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