Re: Receiver Onkyo HT-R570 no sound .
Hi, I am back, and I did not resolve the problem yet. I needed stop thinking in the problem because I did not have much time since the last time that I decided to fix de receiver. I will start thinking in the problem again. and would apreciate any sugestions. Thanks
RogerioBarbosa
Rogério Perroti
Last Activity: 04-01-2021, 05:03 AM
Joined: 07-17-2019
Location: RIO DE JANEIRO
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Re: Receiver Onkyo HT-R570 no sound .
Ok, tank you about AMUTE. I injected audio into the CD input and placed the oscilloscope in the Q5600 collector and got no signal.I know Q5600 is not driving because his base is with -15VLeave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
I opened the AMUT line and the V at the base of the Q5600 transistor changed from 2.5V to -15V, so the transistor no longer landed the signal, but the sound did not appear....Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
Yes, there is a MUTE button on the remote, but it is not changing this line that is always triggering the transistor Q5600 at part5: G5. I'm confused because there is a line called MUTE, which I suppose would be the MUTE line....Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
This signal (AMUT) is controlled by a signal from the Q701 IC called AMUT_COM (I also don't know what this signal means). But I suppose it should act in case the something goes wrong. I don´t know what yet. Any suggestion? Thank you very much.Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
Thank you,Yes, it has speaker test/setup feature, but no sound during the test.
I think the receiver is muting, because there is a protection circuit that doesn't allow the sound to reach the power amplifiers in case of something goes wrong. I measured the *V at the base of one of these transistors, and it is positive(2,5V), indicating that it is conducting and ground the power amplifier imput signal , after the pre-anplifier.(Q5600 at part5:G5).The problem now is: Why this V at the transistor base? There is a signal called AMUT, I don´t...Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
With +/- 7V ok, I've injected audio into the CD IN, CAB / SAT IN jacks, and got audio out on TV / TAPE OUT, This suggests that the Q5501 IC is ok. The inputs are being switched by IC. So why do not I have audio output? I went back into the darkness. I tried to find datasheet of R2A15218FP, but I could not get the pdf. Any suggestion? Thank you.Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
Thank you very much. You are completly right! When I put the 37 screws back into the back cover, all +/- V returned to normal. I was putting some screws back in place to measure. But now the original problem persists: No sound. It all started when I decided to measure the +/- 7V, because for me the problem is in the Q5501 IC that seems not to be working. I do not know how to test it, I started by testing the +/- 7V, and measured + 6V instead of + 7V. I thought this is the problem because this IC works with values between +6.5V and 7.5V, but...Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
what I do not understand how the tuner can affect the -15V power suply, if its power suply is only + 9V, derived from the + 15V .Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
tuner is ok I exchanged the original for another and the problem persisted. I'll check the transistor. Thank you.Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
+- 15V power supply and +- 7V power supply and service manual....Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
I forgot -15 V, With turner pack -> -20,5V
Without turner pack -> -13,8VLeave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
Thank you, Yes I did.
It seems to be really an electronic problem. I made a table with the V + and V- with the Turner pack and without the Turner pack.
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Should be +22V / -B / +15V / +7V / - 7V
With Turner pack +20.2V / -31.6V / +8.9V / +1V / -12.7V
Without Turner pack +27,1V / -26V / +15,5V / +7,5V / -6,1V
-------------------------------------------------------------------------------------------...Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
Any help?Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
I changed the Tuner Pack and the problem remained the same. It may be some circuit that may be draining more current than it should. I measured the current that the Turner Pack is consuming and it was 60mA, less than specified in the service manual (100mA).Leave a comment:
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Re: Receiver Onkyo HT-R570 no sound .
Yes I hear speaker protection relays click on a few seconds later.
No audio at the RCA Tape out jacks on the rear panel of the receiver.Leave a comment:
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Receiver Onkyo HT-R570 no sound .
My receiver stopped playing any sound suddenly. I tried all the entrees and nothing.
I decided to measure +/- 7V which are responsible for the operation of the R2A15218FP chip, and the + 7V was only +6V. I measured the + 15V and it was only + 14V. The line - 7V, was ok. After many measurements and exchange of some caps, I realized that when I disconnect the turner pack, the + 7V returns to normal, but the -7V drops to -6V. From the tests I did, it does not seem to be a source problem. Any idea? Thank you very much, because this receiver is really hard to repair. -
Re: New Members - please post your introductions here
Hi, I am an electronics engineer, and I have been repairing my electronics in these last years without any difficulty. But now I came across a problem on my onkyo receiver that is very difficult to solve. So I decided to ask the forum for help. I am Brazilian and I hope also to be able to help with my experience.Leave a comment:
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