I suggest that the HV Multiplier is bad. I had a 468 and a 475 that both had bad HV Multipliers (Both shorted). On my units with a shorted HV Multiplier. there was no trace until the service jumper was removed. The shorted multiplier was grounding the HV transformer and loading it to the point that no trace was produced, my -2450V was only about -300V. If the HV Multiplier has failed ¡°open¡± instead of ¡°shorted¡±, then the trace will be shorter than normal, regardless of the service jumper. An open HV multiplier will not load the HV transformer but the post deflection acceleration voltage will still not be there. On my particular units, Once the service jumper was removed, the short to ground was removed, my -2450V was restored and my trace came back, but in a shortened version, in either scenario there was no post deflection acceleration voltage. Replacing the HV Multiplier restored both units to a full trace. My 2 cents. I would love to hear any other ideas on this fault.
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Michael Lynch
Dardanelle, AR
Mlynch001