I had problems with FM in my bought receiver. The tuning and operation of the FM was unstable, especially at frequencies above 100 MHz, noise and wheezing during tuning and listing, bad sensetivity.
Replacing capacitors and cleaning the board is the first priority step for this receiver. However, the problem with the FM usually remains. The reason in my case is the corrosion desoldering of the components located near the T10 coil, namely D10 and D16, in other case may be some nearly components. It is imperative to resolder them. In my case, replacement was not required, only resoldering. In order to do this simply, it is better to remove the coil.
After resoldering, the FM began to work perfectly and stably, it receives even in the “Local” mode.

 

I had problems with FM in my bought receiver. The tuning and operation of the FM was unstable, especially at frequencies above 100 MHz, noise and wheezing during tuning and listing, bad sensetivity.
Replacing capacitors and cleaning the board is the first priority step for this receiver. However, the problem with the FM usually remains. The reason in my case is the corrosion desoldering of the components located near the T10 coil, namely D10 and D16, in other case may be some nearly components. It is imperative to resolder them. In my case, replacement was not required, only resoldering. In order to do this simply, it is better to remove the coil.
After resoldering, the FM began to work perfectly and stably, it receives even in the “Local” mode.

A VGm2u, Hi. Prashanth from South India. I hv a similar set that has stopped working now but I think any bright guy should be able to put it bk on its feet again. If annoying interested then pz let me know.
Thank you and take care. Bye

Moderator edit: email address removed to avoid spam.

 

I had problems with FM in my bought receiver. The tuning and operation of the FM was unstable, especially at frequencies above 100 MHz, noise and wheezing during tuning and listing, bad sensetivity.
Replacing capacitors and cleaning the board is the first priority step for this receiver. However, the problem with the FM usually remains. The reason in my case is the corrosion desoldering of the components located near the T10 coil, namely D10 and D16, in other case may be some nearly components. It is imperative to resolder them. In my case, replacement was not required, only resoldering. In order to do this simply, it is better to remove the coil.
After resoldering, the FM began to work perfectly and stably, it receives even in the “Local” mode.

Just to thank you, as I had the same issue with my SW7600 unit and I was able to fix it using your hint. Thank you !

 

I had problems with FM in my bought receiver. The tuning and operation of the FM was unstable, especially at frequencies above 100 MHz, noise and wheezing during tuning and listing, bad sensetivity.
Replacing capacitors and cleaning the board is the first priority step for this receiver. However, the problem with the FM usually remains. The reason in my case is the corrosion desoldering of the components located near the T10 coil, namely D10 and D16, in other case may be some nearly components. It is imperative to resolder them. In my case, replacement was not required, only resoldering. In order to do this simply, it is better to remove the coil.
After resoldering, the FM began to work perfectly and stably, it receives even in the “Local” mode.

I had a strange behaviour with a same radio: when starting it was “sweeping” all fm stations (slowly) until reaching the desired frequency. If switching to a lower frequency than 100mhz, and back to 100+, sometimes it would start working normally after 3-4 times alternating between them. Then operation was normal. It turned out the via below D10 was damaged (connects D10 to R50 on the other side of the board). I found the solution after reading this post, I removed D10 to clear the pads and apply new solder and after it wouldn’t lock to any desired frequency at all. Using a thin wire to reconnect the diode to the resistor on the other side of the board solved all problems. Now it works perfectly. Thanks a lot for your help!