Max Holubitsky
August 11th 03, 07:04 PM
Hi,
I know this may be slightly off topic here, but there seem to be some
people around who are familliar with servicing 1970s audio equipment, so
I may as well ask.
I have recently had to diagnose a Yamaha CR-800 receiver. It was playing
perfectly, and then went dead on both channels. I have tested it, and
the power amp section is perfectly fine (thank god). Seeing as how both
channels went dead at the same time, I suspect it's a power supply
related problem, to do with the pre-amp section of the receiver. I
verified that the preamp section will not pass a signal from the aux
input, to the pre out, on either channel. Is there anywhere specific I
should look?
I didn't have any test equipment with me while I was looking at it
initially, so I didn't get any farther into it. Some of the circuit
boards are literally burried under the tuner section, and I can tell
this is going to be an ordeal to work on. All fuses check fine.
Any advice, before I dive in there? I can't believe just how many
electrolytics were stuffed into this unit - if I had to replace all of
them, it would be a nightmare. I really just want to get it working
again, as it sounds good, and the variable loudness control is a useful
feature, when listening at low levels.
Max
I know this may be slightly off topic here, but there seem to be some
people around who are familliar with servicing 1970s audio equipment, so
I may as well ask.
I have recently had to diagnose a Yamaha CR-800 receiver. It was playing
perfectly, and then went dead on both channels. I have tested it, and
the power amp section is perfectly fine (thank god). Seeing as how both
channels went dead at the same time, I suspect it's a power supply
related problem, to do with the pre-amp section of the receiver. I
verified that the preamp section will not pass a signal from the aux
input, to the pre out, on either channel. Is there anywhere specific I
should look?
I didn't have any test equipment with me while I was looking at it
initially, so I didn't get any farther into it. Some of the circuit
boards are literally burried under the tuner section, and I can tell
this is going to be an ordeal to work on. All fuses check fine.
Any advice, before I dive in there? I can't believe just how many
electrolytics were stuffed into this unit - if I had to replace all of
them, it would be a nightmare. I really just want to get it working
again, as it sounds good, and the variable loudness control is a useful
feature, when listening at low levels.
Max