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Old 09-28-2018, 12:07 PM   #1
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Chungalin's Avatar
Join Date: Jul 2014
City & State: Menorca
My Country: Spain
Line Voltage: 230V 50Hz
I'm a: Professional Tech
Posts: 315
Default Sony CD player CDP-397 repair, No Disc, fixed

This nice and simple CD player based on KSS-240A doesnít read discs. Disc spins with apparent normality but after a few seconds it throws NO DISC message. Disc stops spinning but it doesnít actively brake.

25 years old and itís clean as new, incredible. This even rules out dirtiness. I suspect of badly bend 12 track FFC, but replacing it doesnít improve anything.

CD Servo PCB doesnít have any electrolytic cap to check. Thatís a source of problems in Sony CD PCBs with a few caps (either through-hole or SMD). Iím 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 10ĶF/10V, around IC291 special 5V regulator. I replace them and itís fixed!
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