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Sony CFD-S05 CD Radio Cassette Player was released in 2010, and has the CD-R/RW playback function.

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The Sony CFD-S05 unit will not power up

When I try to turn the unit on it briefly reads 3 (volume indicator and Mega Bass). It then immediately shuts down. I have tried with batteries and the power cord.

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Hi cndwilson a friend brought in the same device with the same problem. I could not find any burned/leaking or domed looking caps but I'll check again. Did you manage to solve the problem?

Kind regards

Ronald

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I troublehot (and fixed!) that very problem just the other day. You can get schematics for that unit at electrotanya. The symptom you describe happens when the main voltage does not turn on (quickly enough) when the unit leaves standby mode. The start-up process is actually quite complex (possibly it is meant as short-circuit protection): Power is turned on by a high level on the base of Q951. The high level there turns on the transistor. The first thing that happens is that the main power rails (+9V, +6.2V and +3.3V) are pre-charged through the diodes D951 and D952 (a dual diode). The total current available to pre-charge the power rails is limit by R950-R953 to around 20mA. Only when all of the power rails are charged to around 1.0V, the emitter voltage at Q951 is high enough to turn on Q953 which drivers the main power switch transistor Q952. The +6.2V and +3.3V regulators are powered from the output of Q952 and thus also turn on after Q952 turns on.

In the case of my broken unit, the pre-charge didn’t manage to bring up the +9V rail above 100mV (which can be measured for example at pin 1 of IC302). This was caused by excessive leakage current in C329. I temporarily “fixed” it by accidentally shorting the switched +9V line to the unswitched +9V line, which slightly reformed the capacitor. The permanent fix is to replace the cap.

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Novice here. What is the "cap" you refer to.

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Hi @ Mary Smyth,

I think that the "cap" being referred to is "capacitor" C329 on the circuit board.

The value of the capacitor and its' working voltage value (VW) is usually stamped on the side of the capacitor

IF it is an Electrolytic type capacitor it will have a stripe down one side indicating the -ve leg of the capacitor. Usually it is marked on the circuit board where the capacitor is installed which is the +ve leg so be aware if you replace it, ensure that it is installed in the correct way, as reversing a capacitor can damage them (if the voltage s high enough in relation to their working voltage they can even explode with a bang!)

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Thanks jayeff. I'll take it apart and check this out.

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@Mary Smyth: @jayeff is right. I really recommend you to get the service instruction of that device. I already hinted at a source in my answer: Go to elektrotanya.com and search for "CFD-S05" in the "service manuals, schematics, eeproms finder" dialog box. The Service manual contains the PCB layouts, the schematics and parts list. C329 is an electrolytic cap, 470µF, 16V. More volts don't matter, but the new capacitor needs to fit into the place of the old one. The leg spacing of C329 is 2.5mm or 1/10inch. Some tables quote it as "RM2.5". Installing capacitors with bigger leg spacing is more difficult, but it should work, too.

To replace the capacitor, you need to desolder the broken capacitor and solder a new capacitor there. Use the service manual as reference for how to unmount the PCB to get access to the soldering side of the PCB.

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My cfd-s05 has the same symptoms. I switched out capacitor c329 with a new cap, but still the same problem persist.

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I had the same problem and found C953 had gone short circuit, replaced this and it now powers up OK.

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Thank you, Mark, for an answer that works! Finally put my unit back together after months of it being in pieces. I was about ready to give up, but then your answer popped up in my inbox. I tested the cap and sure enough it was shorted. Thanks again for that!

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cndwilson sounds like you have an issue with the power circuitry on the mainboard. Disassemble it and check for any burned/leaking or domed looking caps. Post some images of your board with your question. Use this guidefor that. That way we can see what you see. Use these guides to work on your Sony

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