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Pioneer SX-626 blows right channel fuse
- Thread starter Audiobro
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Bruno Primas
Super Member
Measure across the trimmer resistors with the power off that control the bias voltage. VR3 and 4. They are 100 ohm trimmers, so the should measure somewhere in the middle of the 0 -100 range.
A transistor or diode has to be shorted somewhere if a fuse is blowing. Keep looking.
Winslow S.
New Member
The bias and/or offset trimmers on the amp board go bad and cause the fuses to blow. Check and replace as needed and you'll probably fix this.
DBT, our little friend.
I put this together based on the pics that @Jailtime posted a while back, and figured I'd take some in process shots. There were a number of threads on these with dead links to imageshack or photobucket (the scourges of the internet) so this should be a good post on the issue that won't have dead links for a few more years at least. 
Firstly we need the following:
-1 grounded socket
-1 socket -> standard light bulb converter
-1 light switch
-1 plastic in wall enclosure, I used an "old work" one meant to mount to sheet rock
-1-2' of 14-2 romex or equivalent. I only ever used single...
Firstly we need the following:
-1 grounded socket
-1 socket -> standard light bulb converter
-1 light switch
-1 plastic in wall enclosure, I used an "old work" one meant to mount to sheet rock
-1-2' of 14-2 romex or equivalent. I only ever used single...
Audiobro
Active Member
It appears that this is the case. One of the two trimmers measures as open. The same trimmer for the channel that works, measures 58 ohms. I'll look for some replacements from Digikey, thanks.
Audiobro
Active Member
Yes, the trimmer on the right channel reads open and the left reads 58 ohms. Thanks.
Bruno Primas
Super Member
ALWAYS a issue on early Pioneers. The good thing is after you replace them, those units are VERY reliable.
Audiobro
Active Member
Do you think a 1/2 watt will be sufficient?
Bruno Primas
Super Member
Yes.
Bruno Primas
Super Member
There are more unique ways of doing it using the old trimmers as a base for the new ones. I just replaced them with these. I tied the middle leg to a outside one.
Winslow S.
New Member
You should replace all four trimmers. These work fine:
If you're really good maybe you could do it without removing the board, because removing the board is kind of a PITA but makes replacement a lot easier. Good luck. - Winslow
If you're really good maybe you could do it without removing the board, because removing the board is kind of a PITA but makes replacement a lot easier. Good luck. - Winslow
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