Dear All,
I'm seeking troubleshooting/repair suggestions on a Continuum/Quantel
PU620 module, which provides the HV for discharge into the flashlamps of a
Nd:YAG laser. Specifically this PU620 is part of an old Continuum/Quantel
YG681 laser, but I've heard that it is still used in some other products
(at least Continuum).
Right now with the bad PU620 in place, the flashlamps of the YG681
laser don't flash and there is an indicated fault condition. The fault
condition may be due to just a logic problem in the PU620, or in fact there
could be (likely is) a problem with the analog HV power supplies. The
PU620 itself consists of mainly analog electronics for HV generation along
with an accompanying logic board in the module. This laser is of a vintage
where the electrical schematics provided for both analog and digital boards
in the PU620 are complete. However, troubleshooting still isn't so easy.
For one thing, the PU620 is interconnected in a rack with all the other
modules to comprise working system. It isn't straightforward to come up
with a method of testing it. (I suspect Continuum/Quantel had/have a
special custom benchtop setup to allow testing and diagnostic
measurements.) For this reason and possibly because high voltages are
present, the manual states no testing/troubleshooting procedures or
suggestions.
With this introduction, my questions are: (1)Can anyone suggest a good
way of proceeding to try to find the problem? (2)Based on experience
either with this specific module or other equipment like it, does anyone
have some pretty good suspicions of where the problem is likely to be?
I've been very impressed through my past experience with some of the
really good suggestions that come from this venue!
Cheers,
Mark Sulkes
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