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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Onkyo TX-DS797 - no digital ins.
Hello all,
I've got an Onkyo TX-DS797 here with a complaint of 'no output'. Well, it works ok with the internal tuner, or an analog input, but not the digital inputs. If you connect a CD player to the coax input, the display shows "PCM DIGITAL" which goes out if you pull the coax cable, so the unit at least knows there is a signal there, but no audio. Any suggestions? Thanks! Tim Schwartz Bristol Electronics |
#2
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Maybe a bad DAC feeding the output stages or a bad mode-switch IC?
Scope for signal out from the DAC and signal out at mode-switch IC in PCM DIG mode. "Tim Schwartz" wrote in message ... Hello all, I've got an Onkyo TX-DS797 here with a complaint of 'no output'. Well, it works ok with the internal tuner, or an analog input, but not the digital inputs. If you connect a CD player to the coax input, the display shows "PCM DIGITAL" which goes out if you pull the coax cable, so the unit at least knows there is a signal there, but no audio. Any suggestions? Thanks! Tim Schwartz Bristol Electronics |
#3
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Tim Schwartz wrote:
Hello all, I've got an Onkyo TX-DS797 here with a complaint of 'no output'. Well, it works ok with the internal tuner, or an analog input, but not the digital inputs. If you connect a CD player to the coax input, the display shows "PCM DIGITAL" which goes out if you pull the coax cable, so the unit at least knows there is a signal there, but no audio. Any suggestions? Thanks! Tim Schwartz Bristol Electronics Just a thought..... I've seen several lately, including Onkyo's, where resoldering the large postage-stamps on the DSP board brought them around. It's tedious, but it might be worth a try. I'll hit it with a heat gun first - if is starts working after a bit I know I'm on the right track. Mark Z. |
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