Sunday, August 18, 2019

Troubleshooting a receiver part 2

First check the plate voltages. Ap is good A,Tr is zero volts.

The triode plate is fed through R17. The screen grid of the pentode is good, we know this because the plate is good. An open screen grid circuit would put the pentode into cut-off.
R17 is open. After replacing R17 and applying power the new R17 starts smoking. Checking the components connected to R17 finds C6 is shorted. Replacing C6 and R17 repairs the audio section. The AM radio is now working but the FM is still dead.

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