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Hi.

I have a HP54502A in fairly good condition I want to fix for my workbench. It fails on A/D test (pass D/A and rest) on CHANNEL 2 only. I have no schematics, just the SM, and if anyone knows of link to any it would be appreciated.

Anyway, have anyone else successfully fixed this error before and what was it? I did see a blog online with at short in PS but ALL voltages seems OK and 5.2 adjusted according to SM. I have swapped the 2 ICs with heatsink around just to eliminate that. In lack of a schematics does anyone knows which IC is the DAC (A/D converter) so I at least can have a look around it and compare channels (CH 1 works perfect).

Any hints are welcomed.........

PS. the Dallas chips has been replaced before I got the scope with a DS1230Y so guess that is not the reason?

I got the schematics for a 54601a is that too far off or similar in chip sets used?

Cheers

You may do better in the [HP-Agilent-Keysight-equipment] group