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JBL JRX100 repair

diy didi

Member
HI Guys!
I have this speaker for repair. The amplifier output is a BTL config.
Im getting a voltage of approx 12V or so across the speaker terminal. with respect to 0V i get -6V on the one terminal and +6V on the other.
That seems strange that both amps are showing the same fault, but in opposite directions.
I have replaced opamps U9 and U10. The ±15v rails are present as well as the +15VSW from the dc to dc converter.
I'm suspecting the IR2111's.
What voltages should I measure at the pin 2's of the IR2111? Im getting -39V.
What other things can I check to get this thing going?
I have attached the schematic
Thank you all!!
 

Attachments

  • job_107 JRX Man Open Me.pdf
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  • job_105 JRX Man Open Me.pdf
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