DD Z2

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Charge more than you think you should charge. Sometimes these amps have intermittent problems that cause them to repeatedly blow outputs and driver board components.

Generally, the only problems on the driver boards are the driver ICs which can easily be replaced, many times while the board is in the amp.
 
I rebuilt the Audio driverboard I replaced the Driver IC's ( IR21844's)

Also replaced the Ic's on the board and the surface mount transistors 1A 2A 1D and 2 D There is also a muting Transistor on that driverboard in Q10's spot


Check all the chokes on the main board..

Also the D1302's (muting transistors) may need to be replaced.

For the Z2 i rebuilt i charged $300.00 since its a large amp and alot can go wrong like Perry said..

If you rebuild the Audio driverboard be careful the pads under the driver IC's can damage easy
 
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Finally i got all the parts.
Power supply seems to work OK
Installed a brand new 3S module (my client had already bought one)
and without the output fets on, when i power the amp, the relays click on and after a second, off.
During this time, i measured around 126VDC on the output. I guess thats not normal...
 
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Unfortunately, it blew two fets from the same bank.
Removed the 3S module replaced fet driver ics, as well as U3 U4 and i checked again for all auxiliary regulated voltages.
Replaced the entire fet bank of 3, and...the same thing happened.
What am i doing wrong?
 
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