Starting with Rev M of the Revolution Master Control Card (MCC) 7160B5622-CFG ETC can repair the card rather than needing to replace.
The revision level for this card can be found printed on the part number stick of the board itself. A is the older revision.
The card in this image is a Rev L. and would need to be replaced in the case of failure rather than repaired.
The master control card can be found in the base of the fixture opposite of the power supply. It controls the lamp, pan and tilt in the fixture.
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