Hello everyone and thank you. the communication board is defective, where can I find this board or its replacement, it failed using another cable. I found 1 burnt diode and the transformer, HFPW+ what voltage should it be, I'm thinking of putting a dc dc converter instead of the transformer, inverter 

4 hours ago, valentin78 said:

the communication board is defective, where can I find this board or its replacement,

See the Serial Communications boards section of the repair and hardware modifications topic.

In this post with a partial schematic trace, note that the HFPW is a roughly square wave signal, that when half wave rectified, should produce about 12 VDC. So you could presumably half wave rectify with a suitable FAST diode and capacitor, and use this to feed a 12 V to ±12 V isolating DC-DC converter. One to three watts should be sufficient power. It should not matter if the voltage isn't exactly ±12 V.

Edited December 16, 20222 yr by Coulomb

1 hour ago, Coulomb said:

See the Serial Communications boards section of the repair and hardware modifications topic.

In this post with a partial schematic trace, note that the HFPW is a roughly square wave signal, that when half wave rectified, should produce about 12 VDC. So you could presumably half wave rectify with a suitable FAST diode and capacitor, and use this to feed a 12 V to ±12 V isolating DC-DC converter. One to three watts should be sufficient power. It should not matter if the voltage isn't exactly ±12 V.

Thank you, I will try this option