My CR-2020 adventure continues. I've gotten the power amp working and I've done the service bulletins.
Now my current (last?) problem is with the tuner section. The FM reception is distorted, regardless of the signal strength. Also, when I release the FM Mono switch I get a 'pop'.
On AM (which I'm not especially concerned with) I get a clicking sound that increases in frequency the stronger the signal is. When I received this the AM ferrite bar antenna was missing so I installed one from a CR-400; I matched the wire colors.
I've recapped (electrolytics) the tuner/preamp PCB and replaced all the tantalum caps with electrolytics.
I've tested the exposed transistors except for the 2SK68A's (I'm not sure how to test J-FETs). There are no apparent bad solder joints (I've reflowed most). I have not opened up the tuning cap assembly.
When I received this receiver it was packed in a wooden crate that had minimal shock absorbent material so I'm fearful that it was dropped and something has cracked.
Thoughts?
JimB
Now my current (last?) problem is with the tuner section. The FM reception is distorted, regardless of the signal strength. Also, when I release the FM Mono switch I get a 'pop'.
On AM (which I'm not especially concerned with) I get a clicking sound that increases in frequency the stronger the signal is. When I received this the AM ferrite bar antenna was missing so I installed one from a CR-400; I matched the wire colors.
I've recapped (electrolytics) the tuner/preamp PCB and replaced all the tantalum caps with electrolytics.
I've tested the exposed transistors except for the 2SK68A's (I'm not sure how to test J-FETs). There are no apparent bad solder joints (I've reflowed most). I have not opened up the tuning cap assembly.
When I received this receiver it was packed in a wooden crate that had minimal shock absorbent material so I'm fearful that it was dropped and something has cracked.
Thoughts?
JimB
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