Hello!
Good day! Please give your technical opinion...
I repairing AS1004, 4 channel Mosconi Gladen. I replaced 4 x 65N06 and SG3525 PWM IC. After I replaced those parts and hook up the positive and negative power supply without the remote positive signal yet, right away the amp draws large current and mosfets becomes hot.
Anything I need to check?
There is no shorted mosfet or hanging gate terminal. I replaced the SG35235 thrice and twice for the set of Mosfets, gate resistors 75ohms and 10k pulldown resistors were also good but still no luck.
Thank you!
Good day! Please give your technical opinion...
I repairing AS1004, 4 channel Mosconi Gladen. I replaced 4 x 65N06 and SG3525 PWM IC. After I replaced those parts and hook up the positive and negative power supply without the remote positive signal yet, right away the amp draws large current and mosfets becomes hot.
Anything I need to check?
There is no shorted mosfet or hanging gate terminal. I replaced the SG35235 thrice and twice for the set of Mosfets, gate resistors 75ohms and 10k pulldown resistors were also good but still no luck.
Thank you!
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Yes, prior to installation of 4 mosfets, I powered the amp and checked the drive signal at the gate pads, they are perfect square wave.
The Amp draws large current if you connect the positive supply and negative supply only. No remote turn on signal yet to amplifier ; mosfets becomes hot.
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Did you try loading the gate-source with a 1k resistor or a 0.1uf capacitor to conform that the drivers were working properly?
Do you have the schematic for this amp?
Do you have the schematic for this amp?
Do I remove 4 fets and replace it with 1k resistor between gate to source? if yes, ill do that.
I don't have schematics, if you have kindly give me an screenshot of that section.
Yeah, I'm thinking like that but I keep checking that there is no reverse connections. I double checked it, power fets the source is connected to my negative power supply.
No, this is new batch and much expensive than I used before due to low gate charge "RS : 671-5159 Fairchild FQP65N06 N-channel MOSFET, 65 A, 60 V QFET, 3-Pin TO-220AB"
The OEM is 65amps, can I use 60amps of rating? I have a lot of stocks 60NF06 that I used before.
If your amp have excessive current draw connecting only negative and positive power cable (and you are sure that to gate pads there is no drive signal without remote cable) then, probably you have defective or false power mosfets.
Check also zener diodes (if there are), big resistor and capacitor which are located near the primary winding.
Check also zener diodes (if there are), big resistor and capacitor which are located near the primary winding.
Thank you perry and mario,
Ive fixed it now, there’s a foreign material that causing leaking current from 12v to one of the pwm output that makes fets turning on.
Ive fixed it now, there’s a foreign material that causing leaking current from 12v to one of the pwm output that makes fets turning on.
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I think i had scaling problem, leakage current creates around 1 to 2volts into gate pads with fets out.
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