Hi All,
Cleaned off the bench and took 83206A off the 8920B - Thought it would be a good idea to run the diagnostic programs that are on the system ROM - Unit passes power self-tests but when running RFDIAGS2 I'm getting errors during the Output section of the test program.
The first error is in the "Output Detector, Detector Caps" phase. The 4 tests check two caps, C419 & C418 both in and out of the circuit together and individually. I get the same result for every test indicating an actual Vdc of 0.038. The diagnostic suggests that the path is A25J55 to A25J56 - From poking around this seems to be W13, a semi-rigid short jumper.
The next set of errors is in the "Output Frequency Range, Loop Closed" phase. It shows a value across the frequency range of 0.038 to 0.041 and again suggests W13. Finally, there are errors in "Bandwidth Control" again pointing to W13.
From reading it seems that W13 is a bit of a known problem child but before opening the unit up and trying to gently clean it, I wanted to ask the group if this could be a false flag from removing the 83206A? Would they have removed that jumper in the expectation that the path would continue through the external 83206A?
Any comments, thoughts, or suggestions are appreciated.
Thanks,
TonyG
