All,
I have a 3008 unit that recently shut down. I was not around when it occurred so I reset the unit and powered back on.
There was a loud pop and it shut down.
Opened it up and found the main power transistors for the surround left(SL) channel shorted between base and emitted.
Further inspection/static tests revealed damage on the pre-amp board as well.
I have replaced everything circled in red on the pre-amp board. Everything was definitely bad- high/open resistors and shorted trans. The cap was replaced just because I had on hand.
Upon reassembly and power up the unit shut down. I pulled the pre-amp board and reset the unit. It works fine.
I decided place a known good pre-amp board from adjacent channel into this one's slot and had the same result.
I placed my repaired pre-amp board in a known working channel and it works fine.
I'm looking for any advice/suggestions on what to look @ next. I suspect it could be in the amp section itself but initial check showed everything working.
I have a 3008 unit that recently shut down. I was not around when it occurred so I reset the unit and powered back on.
There was a loud pop and it shut down.
Opened it up and found the main power transistors for the surround left(SL) channel shorted between base and emitted.
Further inspection/static tests revealed damage on the pre-amp board as well.
I have replaced everything circled in red on the pre-amp board. Everything was definitely bad- high/open resistors and shorted trans. The cap was replaced just because I had on hand.
Upon reassembly and power up the unit shut down. I pulled the pre-amp board and reset the unit. It works fine.
I decided place a known good pre-amp board from adjacent channel into this one's slot and had the same result.
I placed my repaired pre-amp board in a known working channel and it works fine.
I'm looking for any advice/suggestions on what to look @ next. I suspect it could be in the amp section itself but initial check showed everything working.
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