jokerwing
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- Jan 28, 2022
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I was gifted a Pioneer SC-1523 receiver that doesn't produce sound by a friend of a friend and I can't find any good resources on troubleshooting the internals of a receiver.
For context I've done a fair bit of hobby electronics work (making speakers, custom lighting projects, and troubleshooting a prior vintage amp), so I don't feel out of my depths here.
What I know and have done so far.
1. Check all the fuses, 9 of them that I can see, are conducting.
2. Power on the receiver and verify that functions seem normal.
2. Factory reset the receiver.
3. Try playing sound from analog input (RCA "CD") and a digital source (a USB flash drive and internet radio).
3a. Tried using the MCACC demo scene too
4. I didn't get sound from any of the three speaker groups on a know good speaker or from the phone output on the front panel
4a. Or from the HDMI group out but it's harder for me to test if that's a known good setup.
BUT
5. The speakers at least partially work. When I turn the speakers all the way up (+12db) I can hear a light hum from the speakers. When turning the volume knob I can hear a little texture in the hum. I can also possibly hear a tiny bit of feedback when I connect / disconnect analog inputs.
This makes me thing the problem isn't with the power or with the amplifier but is somewhere else (but where).
I did a visual inspection looking for blown caps and didn't see any but there's a lot of PCB and I can't see the bottom of several boards.
A number of the connectors are well labelled with their signals but I don't have a good sense of where to start checking for dead signals.
Not sure what I can check next,
Thanks in advanced,
--a newbie
For context I've done a fair bit of hobby electronics work (making speakers, custom lighting projects, and troubleshooting a prior vintage amp), so I don't feel out of my depths here.
What I know and have done so far.
1. Check all the fuses, 9 of them that I can see, are conducting.
2. Power on the receiver and verify that functions seem normal.
2. Factory reset the receiver.
3. Try playing sound from analog input (RCA "CD") and a digital source (a USB flash drive and internet radio).
3a. Tried using the MCACC demo scene too
4. I didn't get sound from any of the three speaker groups on a know good speaker or from the phone output on the front panel
4a. Or from the HDMI group out but it's harder for me to test if that's a known good setup.
BUT
5. The speakers at least partially work. When I turn the speakers all the way up (+12db) I can hear a light hum from the speakers. When turning the volume knob I can hear a little texture in the hum. I can also possibly hear a tiny bit of feedback when I connect / disconnect analog inputs.
This makes me thing the problem isn't with the power or with the amplifier but is somewhere else (but where).
I did a visual inspection looking for blown caps and didn't see any but there's a lot of PCB and I can't see the bottom of several boards.
A number of the connectors are well labelled with their signals but I don't have a good sense of where to start checking for dead signals.
Not sure what I can check next,
Thanks in advanced,
--a newbie