For reasons I need not go into here, I own two (2) identical stereo receivers. They are both about 15 years old.
I've been using one regularly, while the other was kept as a spare... and has been unplugged for at least the last year or two.
Recently, the receiver in use stopped 'making noise'. It had worked fine the previous day, but the next, when turned on, there was no sound at all from the speakers... on any input. The unit turns on, goes through the protection circuit dance, the display shows the input source, but no sound... unless the volume is turned ALL the way up and the source can be heard... very, very faintly.
The spare receiver had been tested prior to being put upstairs... and it worked fine... no problem.
Rather than make any effort to diagnose the receiver (recently) in use, I brought the spare downstairs, thinking to swap it into place for the other. I just happened to bring a speaker and a length of zip cord downstairs to check function of the spare before putting it into use.
To my surprise, it now seems to be suffering from the identical problem... turns on, lights up, but no sound.
I opened up the spare receiver, checked the power amp output fuses (with an ohm meter) and they were fine. I checked the fuse that (I think) provides power to both amp stages... and it was fine. The main power fuse is fine.
That's about as much as my diagnostic skills allow.
Somehow it seems hugely unlikely that the two receivers would fail - with the same problem - within the same week... especially when the spare was known to be good and hadn't seen use for some time.
To my knowledge, the units have no internal battery that might power a 'calendar' or cumulative use logic chip that might trigger a planned obsolescence function... and only my paranoia suggests that there might be such a function in the design.
But this has got me completely stumped.
Any ideas?
Thanks.
Peter B.
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I've been using one regularly, while the other was kept as a spare... and has been unplugged for at least the last year or two.
Recently, the receiver in use stopped 'making noise'. It had worked fine the previous day, but the next, when turned on, there was no sound at all from the speakers... on any input. The unit turns on, goes through the protection circuit dance, the display shows the input source, but no sound... unless the volume is turned ALL the way up and the source can be heard... very, very faintly.
The spare receiver had been tested prior to being put upstairs... and it worked fine... no problem.
Rather than make any effort to diagnose the receiver (recently) in use, I brought the spare downstairs, thinking to swap it into place for the other. I just happened to bring a speaker and a length of zip cord downstairs to check function of the spare before putting it into use.
To my surprise, it now seems to be suffering from the identical problem... turns on, lights up, but no sound.
I opened up the spare receiver, checked the power amp output fuses (with an ohm meter) and they were fine. I checked the fuse that (I think) provides power to both amp stages... and it was fine. The main power fuse is fine.
That's about as much as my diagnostic skills allow.
Somehow it seems hugely unlikely that the two receivers would fail - with the same problem - within the same week... especially when the spare was known to be good and hadn't seen use for some time.
To my knowledge, the units have no internal battery that might power a 'calendar' or cumulative use logic chip that might trigger a planned obsolescence function... and only my paranoia suggests that there might be such a function in the design.
But this has got me completely stumped.
Any ideas?
Thanks.
Peter B.
-----