V2000 Blooming issue

Working on a Asteroids machine with a Wells Gardner V2000 19" monitor.
Deflection board and HV cage have been capped after it was determined
that there was a "blooming" issue with the monitor. That did not fix
the issue so the HV diode was pulled from the HV cage and a new Varo
1802? diode put in. The cups and springs on both sides are in very good
condition however the diode wants to push out of the connectors due to
the spring resistance. The plastic supports for the HV line are not
enough to keep the diode securely installed in the cups. I did wipe the
"goo" off the ends of the connectors and now think that perhaps I should
have left it there as it did provide a sort of "glue" to keep the diode
in place. Despite the looseness of the fit, The diode is securely
attached to the springs but I still am getting a blooming issue after
about 10 minutes of warmup. The image expands in both directions.
There appears to be no change in symptoms from the original diode. I
tried freeze spray on various components with no change. If I let the
monitor cool down, the image is correct and starts all over again.

Any ideas? Usually it is just the diode or the transistors on the
outside of the HV cage. (Those are good)

Pat
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Received on Thu Apr 12 17:33:20 2012