Help on B&K precision 1211A color pattern generator

Hi,

My B&K 1211A color pattern generator is defective. I can not adjust the channel A and Channel B and chroma frequencies. As long as I disconnect the variable capacitor for channel B, the channel A and chroma frequencies can adjust to the specific values. If I re-connect the variable capacitor, the unit not working anymore. I change the variable capacitor for channel B but still act same. If anyone in this news group has the schematic or any ideas for troubleshooting. All the TTL IC have been test and ok and switches all fine.

Thanks

Reply to
Eric
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Maybe the variable capacitor is shorted. Have you measured the resistance from one terminal to the other with at least one terminal disconnected from ecerything else. You should have infinitely high resistance.

H. R. (Bob) Hofmann

Reply to
hrhofmann

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