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Attempting to repair older Pioneer power amp. model A77X. Faulty ic drives part #pa0016, in conjunction with both transformers need replacements. if replacement icdrives are available, please quote price and approx, delivery. Thanks.

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If the output pac (PA0016) as well as the transformers need to be replaced, you are going to have a hard time finding them for one and none of them are cheap. What is the problem with the piece that leads you to believe that you need all of these parts?
Dan

Posted on Apr 08, 2008

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I have a Kenwood KR V6090 tuner amp. Can anyone please tell me if I need a record deck with or without a pre amp fitted.


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DV-585K (PIONEER), My player is not turning on. I've already check the cord, fuse and the switch and they are all good. What else could I check or is there any parts that needs to be replace if problem is...


Hi,
The most common caused why your unit didn't power up was because of faulty power supply board. Since you've already checked the AC line, the fault now is quite technical if you haven't an experienced in electronics. The board must check the faulty parts like the fusible resistor in line with the shorted voltage regulator IC/transistor (mounted in heat sink), dried electrolytic filter capacitor, open/shorted chopper transformer, shorted diode. You must know how to test this parts to pinpoint where the fault came from. If you can't troubleshoot the board yourself, you may replaced it by inquiring to your local pioneer service center for the power supply board's availability.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

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Dont bin it!!!
If you are really lucky it may have just blown an internal fuse or if your not so lucky it may have killed the mains transformer which is still worth repairing.
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I repair DJM 600 for many years. :) The reason for the burning of IC 557 (+8V H 600mA ) is invalid amplifier for headphones!!!
Replace IC 310 and IC 312 (in big mainboard), and replace
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!!!!!CHECK YOUR HEADPHONES!!!!!! This is the cause burning amps.!!!!!

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1 Answer

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It is not always this part that causes the failure, sometimes it can be the muting transistor, a voltage regulator or even the micro on more rare occasions. It will require some troubleshooting to figure out exactly what part it needs. You will need to have an O-scope to trace down the audio signal and follow it from one pin to another. You also need a multimeter to check a few voltages in the radio. All of this must be done on a test bench with the radio powered on with a power supply. If you do not have these tools, you will not be able to figure it out for certain, you would only be taking a stab in the dark. That can get rather frustrating and even expensive buying parts that do not fix the problem.

The electronic volume IC is a flat pack surface mounted component and requires the very best soldering skills to be able to replace. It is very easy to do damage to the circuit board that can not be repaired if it is not done perfectly. If you have not replaced these type of components before, you should not even attempt this repair.

If you would like the service manual I can sell you the PDF format of it for $10. I also have the service manuals for most Pioneer products as well as Kenwoods, JVC, Panasonic, Denon, Marantz, Clarion, and more. Let me know if you would like to get it. The service manual is very helpful in repairing electronics. It contains the schematics and parts list which is vital to make sure you get the right parts and to be able to trace down any signals and to know what parts are doing wha, and to figuring out if the voltages are correct.

I hope this helps,

Dave

I hope this helps

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Hi There!

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