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Azur Electronics

REPAIR HP 3763A
ERROR DETECTOR

April 2017

The HP 3763A Error Detector on initial testing failed the Operator's Checks. The Adjustments including power rails are ok. Converted the front panel connections: Clock Input and Input A from 75Ω to 50Ω.  The Trigger Output is already 50Ω. Front panel connections: Clock Output; Count Gate Input; Sync Input are all ECL. Started working through the Troubleshooting procedures.

Local and Interval Times
Interval Time should start up as 00 00. Tricky fault turned out to be a failed buffer/driver output A14 IC5 holding the bus low.

Counter Gate Output on Rear Panel had no output. Fuse  A8 F2 replaced.

None of the odd numbered Word switches working. Flip-Flop A7 IC9 had failed.

 
Testing A14 PCB
May 2017



to be continued