I Taked readings while i tried to move wiggle the transformer, but i have no succes making the resistance to chance in value.
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I don't see a problem other than that you read something well over 1000 ohms between the primary and secondary grounds. It's often 1000 ohms but can vary by amp. I don't know for certain what this amp should be.
Outer rectifier to the secondary ground is simply reading the secondary windings.
Yes, center to outer on the rectifiers is reading the rail caps charging.
Outer rectifier to the secondary ground is simply reading the secondary windings.
Yes, center to outer on the rectifiers is reading the rail caps charging.
Thank you i was thinking it was a bad reading between prim and secondary, the value is not 1000 ohms is 1000000 ohms
1x10^6 ohms
I do not know what else check, the gates with no mosfets has good square signal, i installed irf3205 good checked mosfets, and i can not make the PS to start correctly, even without the rectifiers
When i put 12v in remote the amp PS tries to start but fails, i measure the signal in gates and is not present, without mosfets in board i got a clean nice square waves, but when install mosfets i los the signal, the mosfets get hot, some kind of short is present, i teste diodes gate reistances other resistances of the PS an i can not find the problem
I already did that, in coments 8, 9 and 10 you can see the results, aparently there is nothing wrong, the signal looks good i installed 22nf cap.
Make a note of the PS driver IC voltages (on every pin) before and after the FETs are in the board. Which ones change when the FETs are in the board?
Perry i replaced PNP PS driver transistors an it worked, i got 50 and -50 volts in rails, now i got another problem
The output fets of the positive rail is getting hot, i post a picture of the scope readings.
between gate and source i got 10.2 kohms i desoldered that bank and the value stays in the board,i desoldered diode tha i thinked was bad but the value remained in the board
following the value that resitsance is present in transistors mpsa56 of the driving board this value is suspicios to me
10.2kohms (inverting polarity of meter is the same value) between emisor and colector pins of a56 is normal value?
the weird signal is channel 1 and is negative rail channel 2 positive the ground was referenced in secondary ground.
The output fets of the positive rail is getting hot, i post a picture of the scope readings.
between gate and source i got 10.2 kohms i desoldered that bank and the value stays in the board,i desoldered diode tha i thinked was bad but the value remained in the board
following the value that resitsance is present in transistors mpsa56 of the driving board this value is suspicios to me
10.2kohms (inverting polarity of meter is the same value) between emisor and colector pins of a56 is normal value?
the weird signal is channel 1 and is negative rail channel 2 positive the ground was referenced in secondary ground.
Attachments
If it's the isolated version, connect the ground clip to the source leg of the FET while probing the gate with the tip of the probe. That will give you the best drive waveform.
To be safe, unplug the other probe from the scope.
To be safe, unplug the other probe from the scope.