rulerboyz
AK Member
I came across a Sony CFS-920 that only had sound coming from one speaker. Just for the sake of practice I decided to see if I could get the other speaker working. I first tried to determine if it was a bad speaker, but both speakers were fine. I then tested the transistors, diodes, resistors (there aren't that many in the amp section). I put new caps in the amp section (panasonic ones I got from a computer power supply). I figured it must be a bad IC so I ordered a new one (for a few dollars) it has 12 pins.
Soldering on these cheap flimsy boards can be tricky because the traces lift very easily. I had to connect all 12 of the leads with wire to the next solder joint in the path. I had replaced two transistors and that was also a challenge because I had to connect the base, collector and emitter with wires again. It took a little bit of fiddling to get the solder joints on all 12 pins in good enough shape to get sound from both speakers. I was quite satisfied with the result as far as the FM radio sound goes.
Soldering on these cheap flimsy boards can be tricky because the traces lift very easily. I had to connect all 12 of the leads with wire to the next solder joint in the path. I had replaced two transistors and that was also a challenge because I had to connect the base, collector and emitter with wires again. It took a little bit of fiddling to get the solder joints on all 12 pins in good enough shape to get sound from both speakers. I was quite satisfied with the result as far as the FM radio sound goes.
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