I purchased a Parasound HCA 2205a off eBay that was listed as used, in good working condition, but when I plugged it into the outlet, it sparked at the receptacle and inside the chassis. I opened up the chassis and found this:
Now all five channels are in standby mode. I took it to an Authorized Parasound Service center and the tech quoted the fix at $275. He looked at it for about 10min. I figure replacing the cap and fuses would probably fix the problem. What do you guys think?
Now all five channels are in standby mode. I took it to an Authorized Parasound Service center and the tech quoted the fix at $275. He looked at it for about 10min. I figure replacing the cap and fuses would probably fix the problem. What do you guys think?
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Most likely not the cap.looks like one of the to-92's (transistor) let out a little "magic smoke" .
OS
What about the pinsize hole on the side of C91, 22uf 50v cap? If it is the input board, how would I fix it?
Before hacking into amplifier, you could start by looking at DC voltage at the output of each amp. That's measured with respect to audio ground right at each power amplifier output itself, before the relay(s) or other switching, etc. If that's not within 100 mV of zero when there is no signal or load applied, you have a serious problem with that amplifier.
There's five amps, and you can easily find which is/are causing the protection to kick in and stay there, without breaking any connections. If there is not enough DC to be concerned about, like <30 mV, then the problem is elsewhere, maybe even in the protection circuit itself.
There's five amps, and you can easily find which is/are causing the protection to kick in and stay there, without breaking any connections. If there is not enough DC to be concerned about, like <30 mV, then the problem is elsewhere, maybe even in the protection circuit itself.
Hi Ian, many thanks for the feedback! I will get on it asap. It's great to have a lead
@R_Merola: check Service Manual finder | Elektrotanya (don't mind the language) for many Parasound schematics (unfortunately not the 2205 but they seem to be rather similar).
@R_Merola: check Service Manual finder | Elektrotanya (don't mind the language) for many Parasound schematics (unfortunately not the 2205 but they seem to be rather similar).
I've requested a schematic at Parasound and asked them for some thoughts. Maybe they are happy to help a bit ...
So far I've been unsuccessful to locate a fault on the control circuit.
All 5 connectors from the amps to the control circuit give the same values. Hence why I think the amps are fine (each connector: all leads are 15 volts except the load is about 2mV).
Think .. think .. think ..
So far I've been unsuccessful to locate a fault on the control circuit.
All 5 connectors from the amps to the control circuit give the same values. Hence why I think the amps are fine (each connector: all leads are 15 volts except the load is about 2mV).
Think .. think .. think ..
I am having what seems like similar problems with my HCA 2205A that you had. I turn it on, the amp clicks and clicks and the amp doesn't switch to "Standby" but doesn't have any sound. I did take it to a Parasound repair shop in Oregon and they said it was the relays and told me they repaired it. I was so happy, but when I recently moved to Hawaii and turned it on, it went back to what was happening before, with an added "plus." Now I will also get a high temp warning light on Channel 3 on occasion.
This has gone on for years and now that I'm in Hawaii, I can't find a way to fix this unless I get help to do it myself. Sending it to SF is out of the question. Would cost me $500 to do so. I want to keep this amp.
This has gone on for years and now that I'm in Hawaii, I can't find a way to fix this unless I get help to do it myself. Sending it to SF is out of the question. Would cost me $500 to do so. I want to keep this amp.
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Similar issue
Mine has randomly had this issue for years, I normally just leave it powered up because when I restart it it looks like it should be working, but non of the amps work. I will let it sit and sound eventually works... it could be an hour or a day. It is the strangest electronics issue I’ve ever had.
Mine has randomly had this issue for years, I normally just leave it powered up because when I restart it it looks like it should be working, but non of the amps work. I will let it sit and sound eventually works... it could be an hour or a day. It is the strangest electronics issue I’ve ever had.