Pioneer!
Active Member
It doesn't look like I am the first person to get a hold of one of these recently. I saw a few threads regarding this particular unit from last month, but I want to make sure that I start on the right track here.
Anyways, as of right now, the computer inside the receiver isn't being all that reliable, it fails to boot often, and specific features are not working properly. The amp section seems relatively strong, offset is about -11mV at its highest, and the sound is fairly decent.
On the the computer issues the following issues I have noticed:
Will power on and put out static as the computer hasn't initialized, and sometimes boots fine, but with the below problems..
VU meters non-responsive
Tuner signal meter not working
Tuner lock works but I am not sure that it illuminates?
Auto tuning and stereo indicator won't illuminate.
(What is interesting is that besides the VU meter, all of those indicators are red in color)
I have done a good look over on the chips, they all seem like they should work fine. Most discrete components visually appear fine, with the exception of the transistors on the power supply board, these have caused a fair amount of scorching and the solder joints are looking pretty tired.
I'm thinking I should start by dressing up the poor solder joints and see what improves. There may be some Zeners and resistors that got baked as well. See photos:
Long-term plans likely involve some improved thermal dissipation by way of fan or stick-on heatsinks.
I also need to locate a schematic if anyone knows where one is available, as I cant find it on HiFi Engine
Anyways, as of right now, the computer inside the receiver isn't being all that reliable, it fails to boot often, and specific features are not working properly. The amp section seems relatively strong, offset is about -11mV at its highest, and the sound is fairly decent.
On the the computer issues the following issues I have noticed:
Will power on and put out static as the computer hasn't initialized, and sometimes boots fine, but with the below problems..
VU meters non-responsive
Tuner signal meter not working
Tuner lock works but I am not sure that it illuminates?
Auto tuning and stereo indicator won't illuminate.
(What is interesting is that besides the VU meter, all of those indicators are red in color)
I have done a good look over on the chips, they all seem like they should work fine. Most discrete components visually appear fine, with the exception of the transistors on the power supply board, these have caused a fair amount of scorching and the solder joints are looking pretty tired.
I'm thinking I should start by dressing up the poor solder joints and see what improves. There may be some Zeners and resistors that got baked as well. See photos:
Long-term plans likely involve some improved thermal dissipation by way of fan or stick-on heatsinks.
I also need to locate a schematic if anyone knows where one is available, as I cant find it on HiFi Engine
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