Question about JBL PSW-D112 Speaker
My sub powers on, but sounds like no signal is getting to the power amp. it has a pulsing buzz when music is playing. replaced 2200uf 100v caps. temp has efect around Q12 transistor and R15 resistor is missing. looks like R15 was cut out. no cold solders. any suggestions where to check next. nothing looks burnt or swollen. thanks, tboybad
It sounds like a semiconductor device becomes faulty when it gets hot. Check around the parts you have looked at already for a transistor or IC etc. If you find anything wait till the sound acts up and then spray the suspect part with Servisol Freezer Spray. If the sound becomes normal again it's faulty. You can get the spray from Maplin (UK) or Radio Shack USA or that type of shop.
Posted on Oct 11, 2009
Alf, when there is no parts available you have to start looking at local non authorized repair shops that will inspect and repair the board instead of trying to source a replacement board.
This can be very difficult and could make for alot of expensive deposits. Running out of parts is an ongoing problem with all electronics and sometimes replacement is the most cost effective option.
Posted on Feb 09, 2010
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