QuestionBelow is a question I asked earlier and tried to do a follow up, but the person is not available. But looking at your profile, seems like you will be able to help me here.
Question Hi, I am having trouble with my Aiwa AV-D58 receiver. Display looks fine and seems like its changing the sources fine, but there is no sound at all. I made sure "Tape Monitor" is not selected.
Opened the box and nothing looks fried inside. Tried eveything known in the manual but nothing seems to help. Any help or suggestion will be appreciated.
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Answer This is a DTS, Dolby 5.1 surround sound receiver. Good unit and should be working okey, of course.
Here is what I recommend:
- Unplug the power cord for 30 minutes.
- While unplugged, disconnect all speaker wires at the rear of the receiver.
- Then power it up again and check all the settings. Play the tuner or cd or any audio to see if it seems to be working okey.
- Connect only one speaker, being careful not to touch the wires or short anything. If in doubt, turn the set off while connecting the speaker, then power it up again.
- Go around with the good speaker and one by one check for sound coming from each amp.
IF: You get no sound from any of the amp outputs there is probably a main power supply failure that feeds the audio amplifiers. In this case you will need a service tech to diagnose with instruments what the problem is.
If one or more of the amps is working and the others are not you will need to have the output transistors replaced in the bad channels. They fail most often from overdrive or playing too loud OR from shorts on the speaker lines.
Hope this will help.
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I tried all these suggestions and seems like there is no output in any of the channels.
Looking more closely at the board, it apears that IC601 may be burnt ( not sure, see little brownings burn or heat marks on the other side of the circuit board).
Any help will be appreciated. If you think its the IC 601, then plz guide me where to get it and if its a feasble repair I can do at home.
Thanks a ton.
AnswerWow!! That's an interesting response to your question. It sounds a little like one of those indian rain dances.
There is actually a little more science and logic to the problem. Unless the receiver is truely a DSP and is like a computer with a hard drive, then possibly there would be a reboot that could take place by switching it on and off for a few minutes. I doubt it.
It sounds like you followed a reasonable logic short of checking fuses (if they exist) or speaker switches (if they exist). If you are a trained technician and you can read service manual schematic then you don't want to replace anything without checking B+ at various stages of amplification. Service techs who work on electonics also use silicon when they replace output devices.
As someone who worked for Avery Fisher as a technician in 1968 this is what I would recommend: I don't know how long you've had it but you might want to look for a replacement on EBay. I saw one of those receivers for under $300 on Amazon. Anything out of warrantee these days is a crap shoot. If you've already opened it up then you've voided the warrantee.
