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"Insufficient power system halted" on 7890B GC. Whats causing this?

Good day,

 

We had this issue and we know the power is fine going into the GC as it was working before and then all of a sudden stopped working. If this has been seen before even thought eh power is fine going into it, please can anyone offer any advice? We have taken it apart trying to locate teh issue causing the "insufficient power" but have been at a loss.

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  • Any idea which board? None of the boards inside look particularly damaged nor the toroid. and the voltages on the toroid match up to what is being put into the board mentioned below. 

    I've requested the price of 

    Analog and power printed circuit assembly, G3430-61850

    as the main board inside the GC (board 1):

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