Couple V2000 HV issues

ieure

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Donor 2014-2015
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I love working on vector stuff, but I've never repaired the HV section before.

Monitor #1 — 15V2000.

Symptoms: Unstable image size.

I've seen this be caused by caps before, so I shotgunned the deflection PCB & HV cage. Issue persisted. I have also heard that a failing HV diode can cause this. I replaced the diode with a Varo H598. I kept the original rubber boots, since they were in okay shape, and coated the joints with translucent dielectric silicone grease. Issue persists.

Not sure where to go from here — voltage regulator?

Monitor #2 — 19V2000.

Symptoms: No HV. Spotkiller off. Neck glow & deflection chatter present.

HV cage was missing Q900, plus mica insulators for Q900 & Q903. Replaced missing components & tested Q900/Q903; they metered fine, but no change when power applied. Measuring the cage output on P900, I get 18VDC on pins 4 & 5 (should be 95 & 98VDC), and 3VDC on pins 1 & 3, which should be 300 & 410VDC. Swapped in another cage, monitor works, so the issue is in the HV section. Is there some way to test T900?
 
#1 Are you positive the boots are good enough to keep it from arcing? Also if the springs are corroded or not making good contact that could cause what you are describing.You could solder the diode in place if you have to.Is the 90 volts present? On #2 maybe a bad diode,cap or cold solder joint would be my guess.
 
No. The boots look good to me, and it's not arcing. I don't have a HV probe to see what's going on at that end. I cleaned and reseated everything, but it's still not working.
 
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