Electronics > Repair
Repairing JBL Eon 618s subwoofer - schematic needed (or two component values)
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cozza:
If its the cap from pin 7 of the L6599A to ground you mean, its 2.2uF 6.3V
krisskross:

--- Quote from: cozza on May 17, 2023, 09:10:34 pm ---If its the cap from pin 7 of the L6599A to ground you mean, its 2.2uF 6.3V

--- End quote ---

this ceramic cap c74
krisskross:

--- Quote from: cozza on May 17, 2023, 09:10:34 pm ---If its the cap from pin 7 of the L6599A to ground you mean, its 2.2uF 6.3V

--- End quote ---

hope you remember the  value  ;D
dexterkorgpa1x:
Hi!  i have a problem with this ampliffier. i have replaced burned mosfets and the driver and the smps not starts.i have on the vcc pin and gnd 9-10v.  and clipping. i have measured all of the diodes and resistors. i checked capacitors on tester and i not have chance. i try  without ic the pcb to power up and tghe voltage has 13v aprox but i connected a 1k resistor with a led and the voltage has down to the 2v. can anyone to help me in thios situantion. evrithing  idea is ok for me. thank you in advance!
cozza:
Have you checked the secondary side of the power supply for shorts? The fast diodes and caps for the output rails. Could also be a fault in the amplifier stage loading down the PSU.

Also prudent to test the voltage feedback path involving the optocoupler U6. I would supply the + and - 35V outputs with a current limited variable bench supply (with no mains to the board under test)  and check the voltage at which the transistor in the opto turns on when the 35-0-35 rails are varied - it should be around the 35V point.
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