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54600B triggering problem - would need the CLIP

Question asked by Jacko on Dec 22, 2008
Latest reply on Mar 2, 2009 by ko2054

My 54600B oscilloscope stopped triggering. The problem seems to be that for some reason U73 (SPT9687 video comparator) LE-input (pin 4) keeps the comparator in latched mode (Pin 4 voltage ~ -88mV and TRHYS ~ +0.36V) disabling triggering. However - I do not know why this happens. Does anybody have the circuit diagram for the trigger circuitry and/or component placement picture. All help is greatly appreciated.

BR, Jacko (oh8nj).