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Post by jeremy on Dec 30, 2013 13:44:09 GMT -5
Already checked those, they both read short on the diode scale. That was actually the first thing I checked too. I do want to ask one thing though, the FETS I bought are exact numbers and brand (international rectifier IRF9540, IRF540, N and P channel) But I noticed on digikey that the new ones have letters after them. (IRF540NPBF, and IRF9540NPBF-ND) there were a few variations of them and I bought the 100v 23A ones. Other than the letters on the end, they look identical. Also I tested the new ones on the ohm scale and in one direction they read 29meg then if you reverse the leads they read 20meg, all the other original pioneer FETS that checked out read open both directions when testing them on the ohm scale. I guess I'm just curious if that could be the reason it stays in protection? Hope that made sense!
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Post by jeremy on Dec 29, 2013 22:15:44 GMT -5
Yep, I have Nashou to thank for that, glad to see you lurking around yet!! As for R1067 and R1072 yes, I checked both the emitters and they were open, I replaced them with exact replacements. I should also add that I did check over the amplifier block again after powering it up, nothing opened up in the front left channel, and all the other channels FETs checked out so I didn't go much further on the others. Tomorrow sounds fine M.T. Thanks again, and glad to see ya again!! Jeremy W
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Post by jeremy on Dec 29, 2013 20:54:52 GMT -5
Hello everyone!
I have a Pioneer Elite VSX-09TX HT Receiver I purchased a bit ago to put together an elite system. I'm pretty familiar with repairing electronics, particularly receivers, but I have gotten stumped on this unit.
The problem initially was you could power the receiver on, the receiver displays and one relay clicks (main power relay), then immediately displays "POWER OFF" for about 6 seconds on the display. Then the unit shuts down into protection.
I opened it up and inspected the amplifier block, found the front left channel had blown and I suspected that was the cause. The N channel and P channel Fets were wide open, as were a couple of SMD resistors on the bottom of the amp board. I went ahead and replaced all the parts with genuine originals, and the receiver still has the same exact issue.
The good thing is, the new parts did not self destruct. I am honestly stuck as to where I should proceed from here. I have the service manual (Sadly easy to find vs the USER manual which was a PITA to locate) so if I can get some assistance I would greatly appreciate it.
Thanks, Jeremy W
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