Question about Onkyo TX-DS898 Receiver

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For some time no sound on speakers

When the Onkyo is switch on and the tuner was selected there is a great chance it starts normal. But moste of the time there is no sound on the speakers. Al relais are working and when I wait (5min, 10 min, or much more) suddenly it works. When I switch to another input channel it starts al over, no sound and when you wait long enough the sound will come. The pre-amp is working, I have sound on the outputs like the tape-output. I see that de fan is NOT working until the sound appears on the speakers, then it works. I have the service manual and have tried the adjustment and confirmation procedure. The voltages mentioned are correct, the relais are working normal but the test of the DC detection circuit doesn't work. Measuring is very difficult or even impossible so I hope that someone knows the reason of my problem. Many thanks.

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  • stages Aug 09, 2007

    OK, but what must I check there ? I think that the output of the preamp section is muted. All mute signals are high and I'm waiting now for sound on the speakers so I can measure the mute signals then. So what is the cause of the mute ? When the sound is back, the receiver is playing until you power it off or select another input. It seems to me that there is no basic problem then.
    I have here a service manual but it is a poor document (only 31 pages for such a receiver). There are adjustment and confimation procedures but there is no description what to do when something is not working as it shoot. Like the procedure on the confirmation of the DC protection circuit, when I perform this procedure, the speaker relay doesn't turn off. Ofcourse, the signal is muted but there is no description what to do then as is other service manuals is often described. (I hope my English is readable...)

  • stages Sep 11, 2007

    The problem is solved at this moment. I don't know the why but when I had removed the contoller board (there seems to be some oxidation on the 'big' capacitor) and put it back in again, then there was no problem anymore...

  • fritzyw Dec 14, 2007

    I have a Onkyo TX-904 that I have had for years and suddenly developed this symptom where the sound may or may come on (usually not). You may hear a loud click and the sound will be on and maybe go back off. I read on the Internet that this is a common problem with Onkyo's as the DSP board goes back and the capacitors start to leak. I do not know where the component is to replace. Or I would be happy to jumper it so that there is no mute capability if that would fix it. Anyone know how to find the part at fault?

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Check digital controll board

Posted on Aug 09, 2007

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