Hello again,
Thank you all for your astute and invaluable advice. After following your
suggestions, we doggedly traced this phantom to its ultimate cause, and
found a resolution. After tracing the power discontinuity all the way from
the PSMI and PSMIII power supplies through the HPPR/2 preamp stack-and finding
nothing wrong-we finally started removing connectors from the back of the HPPR
cover module (Rf cables, etc.), and found that disconnecting the PICS cable
solved the issue. The PICS cable had remained the problem, even when the TXI
probe it normally connects to was changed out for our older QNP probe. Just
the loose cable, plugged into the HPPR/2 cover module, causes the -19V
indicator light on the PSMIII power supply to go out. Removing the cable
restored full functionality to the instrument, solving both the lock and
wobb problems.
Attempts at repairing this cable have so far failed. Attaching a standard
ethernet cable end to the HPPR has no adverse effect on instrument function.
We think we may be able to build a new cable, or source one at reasonable
cost, but if you have an extra that would help as well. It is labeled 500MHz
Z14361 ECL00 PH-PICS.
Best to you all,
--
*William Hiscox, Ph.D.*
Assistant Professor, Affiliate
Department of Translational Medicine & Physiology
Elson S. Floyd College of Medicine
Washington State University, Spokane
medicine.wsu.edu
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Received on Thu Aug 14 2025 - 11:43:58 MST