Question about JBL Venue SUB12 Subwoofer
I purchased the JBL sub12 venue series and lately it starts to go on standby then power back on constantly. You know the sound it makes when it gets a signal and powers on, well it does this non stop, it constantly clicks because it goes to standby then back on again. I have tried a new line in cord, a different amp (not the sub amp), and different input to the amp, im convinced that it must be something to do with the sub amp thats inside the box. Anyone else have this problem?
I had the same problem and fixed it by replacing the C37 capacitor (see service manual). It was a 47uF 16V eletrolitic capacitor. No external signals of problems, but it was defective according to the capacimeter. I replaced it because it was the part responsible to retain charge and keep the voltage up in the signal sensing circuit (a simple comparator). After the signal gets low or disapear, it would slowly discharge through a 10Mohm resistor (R121).
Replaced for a 47uF 25V eletrolitic capacitor.Everything went back to normal.
Posted on Oct 26, 2011
Check the audio amplifiers of the sub
Posted on Jul 13, 2009
Another reason for rapid clicking sound (at ~60 Hz, or as fast as it can) is the C2 capacitor that monitors the presence of AC power. Mine was dry, had to replace it (4.7 uF, 50V), did not have 4.7 uF, but judging by schematics 10 uF works as fine. Moreover, another capacitor - C41 - also dried out and had to be replaced to get sound back (that feeds signal from preamp to power amp). It looks like the guys had a really bad electrolite capacitor supplier, I guess I will have to replace them all in a while...
Manual for JBL: http://www.jblsynthesis.com/downloads/products/prod_115_634504909005466954_E250P,P12SW%20sm.pdf
I actually have Infinity TSS-1200 subwoofer, it uses the same amplifier:
It is not the simplest amplifier to fix as it uses rather cleverly MOSFET half bridge switch driver in pulsed 100 kHz regime to make low frequency sound, but on the other hand it does not need large heat sink as it is very efficient.
Posted on Dec 04, 2013
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Posted on Jan 02, 2017
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