G05-805 400V and 90V drop after warm up

dluck

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Sep 22, 2003
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Hi all,
I've a bz cabaret that I'm trying to diagnose monitor problem on. It starts out kind of ok. The 90V and 400V measure within 1-2% for about 2 minutes, but then they both start to drop. The 400V will drop to 300V and the 90V drops towards 60. This is accompanied with the display growing off the edge and the dimming at the same time. The input 38.5V stays pretty constant throughout.
I'm hoping its not the HV transformer. I'm thinking its in the drive electronics. I've tried freeze spray to hopefully more quickly locate the culprit but it hasn't helped.
Any ideas on the likely culprit?
thanks
dale
 
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