This nice and simple CD player based on KSS-240A doesn't read discs. Disc spins with apparent normality but after a few seconds it throws NO DISC message. Disc stops spinning but it doesn't actively brake.
25 years old and it's clean as new, incredible. This even rules out dirtiness. I suspect of badly bend 12 track FFC, but replacing it doesn't improve anything.
CD Servo PCB doesn't have any electrolytic cap to check. That's a source of problems in Sony CD PCBs with a few caps (either through-hole or SMD). I'm running out of ideas but I resist to replace optical pickup. Then I check front PCB, since in this minimalistic model all circuitry but Servo is there. Check ESR for all small electrolytic caps and I find two with disturbing >10Ω ESR due to aging. Both 10uF/10V, around IC291 special 5V regulator. I replace them and it's fixed!
25 years old and it's clean as new, incredible. This even rules out dirtiness. I suspect of badly bend 12 track FFC, but replacing it doesn't improve anything.
CD Servo PCB doesn't have any electrolytic cap to check. That's a source of problems in Sony CD PCBs with a few caps (either through-hole or SMD). I'm running out of ideas but I resist to replace optical pickup. Then I check front PCB, since in this minimalistic model all circuitry but Servo is there. Check ESR for all small electrolytic caps and I find two with disturbing >10Ω ESR due to aging. Both 10uF/10V, around IC291 special 5V regulator. I replace them and it's fixed!
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