Thread: Sharp TRP801
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Old 20th Jun 2020, 11:09 pm   #28
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
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Default Re: Sharp TRP801

The sound IF channel is working but the vision IF amplifier isn't. Six 2SA234 PNP transistors are employed in the vision IF stages. Voltages on stages 3 to 6 are close to the correct figures but the AGC controlled first stage transistor has no base and emitter voltages. Fault traced to an electrolytic capacitor in the AGC circuit gone short circuit.

DFWB.
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