20 Most Recent Panasonic SC-AK220 CD Shelf System Questions & Answers

Speakers blown or internal amp blown.

The problem is in the audio output ic, it is loading the unit into shutdown. The only option is have the ic in the stereo replaced.

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This manual shows the SC-AK220 accepting bare wire for the speakers. However, it warns that you should ...

"Use the speakers only with the recommended system. Failure to do so may lead to damage to the amplifier and/or the speakers, and may result in the risk of fire. Consult a qualified service person if damage has occurred or if you experience a sudden change in performance."

I would read that to also mean 'no other speakers to be used with this electronics'. Since they don't publish the specs of either half I'd be very wary of mixing parts.

If you feel compelled to keep the unit your best bet is to find the original speakers (say, eBay).

Hi,
I think switch mounted on circuit board is not working that is why system control does not get any command to switch the unit in cd mode.
Tactical/ key switches on sound system front board need to be replaced by qualified tech.
Let me know exact model number of your unit to find out its remote control.
Question post shows its Panasonic SC-AK220 shelf hifi system.
Thanks.

HI.This will occur when the optical assembly becomes unstable. this ((Whole One Piece)), assembly incorporates the spin/load motor, optics housing /arm, tracking device and tracking rail. This is connected to the loading dock assembly. This 'NO/BAD Disc' or CD NOT PLAYABLE, code is the result of a failed or burned out lens. It is possible that you have a dirty lens cap. you can try using a cleaning disk in this case to confirm actual lens failure. if the cleaning doesn't restore normal reading capabilities, this will confirm my diagnosis.

You will need to have the optical assembly replaced in this case. once replaced, your unit will be able to read and track once more.

uncrew the unit replace fuse.

try dismantling the shell and check for any jammed object or broken pieces that might cause the door jamming. if it is a matter of a stuck object that somehow got there, you can remove it and hope for the best. otherwize, you will have to replace the broken pieces, or the whole part.

The nearest you will get is the service manual. Dowmload the service manual and follow the dissasambly and reassambly instructions to the letter, otherwise it will not work correctly and the timing will be out. https://elektrotanya.com/panasonic_sa-ak20.pdf/download.html

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Try disconnecting all of the speakers except the left and right main speakers. If it works, check the wiring at the back of each speaker to make sure there aren't any shorts between the terminals. Better yet, just inspect the terminals both at the audio unit and the backs of the speakers. Stray strands of wire reaching across to the other terminal or exposed wire on the other side are a common problem. If you have that all cleaned up and still have the error, you may have shorted transistors in the output amp of one of the channels, very likely the subwoofer. This may be caused by shorted speaker wiring, or the amp may have failed on its own. In either case, you would have to replace both of the output transistors for that channel (they may be built into a power amp module, in which case the module must be replaced). This requires soldering skill, and the knowledge to identify the transistors and check them with an ohmmeter. Most of the time, it's a basic job for any skilled electronic technician. (I did run into one model that would have required two days of disassembly labor just to get at the failed transistors - I told the customer that wasn't designed for service and he would be better off buying something different to replace it.)

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