I have a autotek amp that needs a driver board repair, it seems that autotek ground down the ic identifier numbers. This all I have. If anybody has a driver board or know the ic information that would be awesome.
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Perry,
I replaced d the 4 bad fets/outputs. I also replaced the both of the ir21844s ic’s. After repalcing them the diode check gave readings that matched the first set of outputs. I did not replace U6, U3, or U4 on the driver board. The amp powers with about 3 amps of current draw and power led is on, after about 10secs it goes into protect. I have about 52v rail voltage but I am verified to have about 0.5vdc on the channel that was blown.
I replaced d the 4 bad fets/outputs. I also replaced the both of the ir21844s ic’s. After repalcing them the diode check gave readings that matched the first set of outputs. I did not replace U6, U3, or U4 on the driver board. The amp powers with about 3 amps of current draw and power led is on, after about 10secs it goes into protect. I have about 52v rail voltage but I am verified to have about 0.5vdc on the channel that was blown.
Do you have rail-rail oscillation on the input to the output filter inductors before it goes into protect?
Do the relays ever engage?
Do the relays ever engage?
Do you have rail-rail oscillation on the input to the output filter inductors before it goes into protect?
Why do you have to remove the board?
Why do you have to remove the board?
There are two (one for each driver IC circuit). Without seeing the board, I can't tell you where they will be.
The limiting could cause problems.
The output inductors are the 4 large red coils in the photo. You will see the rail-rail oscillation on the terminals that are connected to the output FETs.
The output inductors are the 4 large red coils in the photo. You will see the rail-rail oscillation on the terminals that are connected to the output FETs.
I replaced the ic3 and ic4 and now the 0.5vdc offset is gone, I will try connecting it to my larger powersupply
While you still have some protection for the amp, push on the driver boards to see if you possibly have an intermittent connection. It's a bit odd to have the same offset for two ICs and then have both go to 0v after replacing them.
If I power it up on large supply it pulls high current until rails are charged then trips protect. I can’t seem to find the fault, unless its on the powersupply side.