JBL JRX 100 Repair

[diydidi]

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!!

[Jazz P Bass]

As the IR2111 pin 2 is an Input pin, -39V seems odd.
Is the voltage there when the IC is removed?

[diydidi]

Hi Jazz. Thanks.
i have not removed them, BUT if you look closely there is a 4k7 connected between pin 2 and Vss (the neg supply rail).
could that possibly explain this?

[Jazz P Bass]

-35 Vdc reference for audio.
I wouldn't trust a reference to ground reading at pin 2.

[diydidi]

I have just received the IR2111's. Will swap and test.