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Last night I was able to help a Forum member who had a "defective" TPC that had no voltage output or knob control in Conventional mode.  As I have seen in the past with my TPC repair work, all he needed was to use the factory Reset command:

Address the unit (TR 1 or such)

Aux 1, Aux 2, Zero

The TPCs apparently get stuck with a false Max Voltage limit or something that needs to be cleared out for normal operation.

 

(The TPC must be properly responding to Base commands as denoted by the single long flash of the COM LED when a valid command is sent to the TPC's address.)

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