Power Acoustik GT1-6000D

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Working on a Power Acoustic GT1-6000D. No drive to the outputs. Suspect driver board. Anyone have a diagram of the driver board? I've not seen this driver board before. Amp powers up. Not in protect. Just no drive to the outputs.


Thanks
 

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"Was the 7812 defective?" Don't know what the voltage should be on the regulator. I have -58.8 on pin 1, -80.3 on pin 2 & -68.2 on pin 3. That's a 12 volt drop between pins 2 & 3. So I assume it's good. Replaced it anyway.


"Are you driving a signal into the amp?" Yes. Using the same signal generator I use for everything.


"Do you have supply voltage on the various ICs on that board" Yes. + &- 15V supply is good.
 
I'll have to set this aside for now. I was looking at the input to the comparator LM311 and my probe slipped. Sure I took out the IR2113 Driver chip. I will have to order it. I'll post back when I get the driver board back up. Maybe it will fix it in the process. Thanks
 
Yes, I have +/-15V on the LM311.
The 12 reg is grounded to the neg rail at -80.3V.
The 4093 and 2113 both have -80.3V on VSS and -68.2V on VCC.
The outputs are in the amp. I drive the input of the amp with a 100hz signal from my B&K generator. Post #7 will show the signal on the input to the driver board. Pin # 8 on the board is the input. Pin #5 is ground.
 
I have the SMD version of this circuit with no driver board. You'll have to translate to your version.

Signal comes into the op-amp on the right (4580) and is amplified. Output is on pin 7.

From there, it goes to pin 2 of the LM311.

Output of the LM311 drives the emitter of Q3 which shifts the level of the signal to the negative rail. The collector of Q3 has a 12v amplitude square wave that is referenced to the negative rail.

All outputs of the 4093 have the same square wave as above except pin 11.

The high and low inputs of the 2113 have the same signal.

Where do you lose signal?
 

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