Hi All,
I am trying to repair a GSI Lumonics servo amplifier board (Minisax Series, exact type number 000-3014006). It is part of a polychrome IV monochromator. It worked correctly before, but died when trying to ignite the Xenon lamp (I am not using the original polychrome power supply, as I only have the light unit with a damaged internal ignitor). The xenon lamp did ignite with its new power supply, but unfortunately this causes the galvo driver to die...

Symptoms:
- no movement of galvo mirror when inputting a control signal
- no torque on galvo mirror when trying to move the mirror manually
- encoder feedback of galvo mirror works ok (when moving the mirror by hand, the position signal and error signals are correctly updated on the test interface connector)
I have checked already the following:
- power supplies are ok (+24V and -24V)
- on board + and - 7V supplies are also ok
- nothing obvious is damaged, no abnormal hot spots with thermal camera (although one LM337 runs quite hot at 100°C)
- enable is tied to GND
- ready signal is not tied to GND (indicating the servo does detect the issue)
- LM3886 amplifiers seems to work ok (they create movements of the mirror when probing on their input pins)
- LM3886 amplifiers do not get any input signal (so the fault is upstream of the amplifiers)
- checked all + and - inputs of various opamps to verify zero volts between the pins and outputs not railed
I have attached the user manual should anybody need this in the future. I know there are some replacement boards available on Ebay (quite expensive

), but would like to find the fault as it is likely to happen again with the xenon igniter.
So if anybody would have some schematics (of any GSI galvo driver so I at least have an idea of the general principle used), this would be useful as this board is a pain to work on due to the board stacking...