ABB SERVO DRIVE FAULT

Hello All,
I'm facing a fault in ABB Bivactor 500 servo drive , its completely silent !, no supply voltage arrive to the
control card ! it seems that the power board of the drive is broken!.
I made an initial test to the power board, the three phase supply voltage is present and the rectifier stage output a dc voltage of 500 v
but no dc voltage out from this board!.
I need the circuit diagram for this power board to help me to find the fault and repair,,
Waiting for kind help.
 

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