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Low current output on an HP 66311A DC Source

Question asked by larry785 on May 28, 2014
Latest reply on Jun 19, 2014 by PeterW
Hi Folks, 

I bought a used HP 66311A DC Source. The voltage output is perfect however the current is limited to around 0.600 amps. I tried to recalibrate the current values, any attemps to program come back with "out of range". Also one of the 15 volt regulators (can't remember which right now) runs a very high temperature - too hot to touch after a minute of warm-up time and no load present. I have a feeling the "Shunt Clamp" drive circuit is the culprit here. I cannot afford to send it in for repair, any suggestions? It's the through-hole board. Anybody have a schematic diagram of the unit? Thanks!