I have a Mastr III and the RX Synthesizer has a fault light flashing. Went through the service manual and found I needed to adjust the VCO to get 2-7VDC on pin A23. However when I do so there is no change in the voltage no matter how much I change the pot for the VCO. I did try this card in another chassis and the voltage will adjust to the proper level however once I have done this and put it back in the other one the voltage still has not changed. It looks like something further up the chain is the problem. Has anyone had a similar issue or problem.
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