CurtPalme.com Home Theater Forum

antorsae · Joined: 16 Jul 2006 Posts: 297

I think it's my 3rd HPVS dead in one of my Ultras:

- My Ultra HPVS works OK but after some hours of watching the PJ "blinks" (but there is no click or noise), the image comes back again but unfocused. It does that every other few hours. I performed the HPVS maintenance thread on that HPVS with the same results.

- I was with the PJ on but nothing on (black screen) and I started to hear HV crackles (the same ones as when you turn the PJ on). The HPVS apparently died.

- ...and I have another one that doesn't turn on either.

Can these things be fixed? Why do they fail?

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

antorsae · Joined: 16 Jul 2006 Posts: 297

Thanks Dragan. Is there an easy-to-access location of the 85V rail? My PJ is ceiling mounted...

I will put in a different LVPS (I have some spares) and check...

stefuel · Posted: Tue May 12, 2009 10:07 am Post subject:

Now if this were a AmPro on it's third HVPS, the AmPro haters club would be all over you like stink on poo. But as it's a Marquee, all you'll get is help and a pat on the shoulder with the comment that "everything will be OK" Laughing

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

I have 6 marquee's and not one bad HVPS Shocked

Athanasios

1031 · Joined: 22 Mar 2006 Posts: 657 Location: Finland

If i remember correct there is similar multiturn trimmer (at lvps) for adjusting +85v voltage ,that was for P14 adjustment. If that is case, then there is possibility, that there can be same kind voltage variations at +85v line that P14 line had when that cheapo original trimmer started to fail. maybe it is time to replace that trimmer and adjust that +85v line to proper level..

**Curt Palme** · Posted: Tue May 12, 2009 1:58 pm Post subject:

THey seem to die in runs. LAst year I couldn't keep them in stock, now I have 10 here as spares. THis year it's Barco quads, I think I've sold 30 this year so far, go figure.

mp20748 · Posted: Tue May 12, 2009 3:05 pm Post subject:

**Curt Palme** · Posted: Tue May 12, 2009 3:33 pm Post subject:

I did have a customer with a Marquee 8000 a long time ago that got one HVPS under warranty from me, about 6 months after I sold him one.

Turns out later that he had put 4 supplies into the damn set, and never told me. He ended up going away after I refused to give him a second free HVPS, and I pointedly told him that he had issues elsewhere. (not to mention the set <giggle>)

I never did figure out what caused the multiple HVPS failures, but now that I've had several of the Ultra supplies die on me (one was repairable), I don't know that they are any more reliable than any of the older Spellman supplies.

I also can't quite figure out how a HVPS could be overloaded. The load is simple- HV out to the splitter, out to the tubes. An overload could occur if constant arcing occured, but you couldn't watch the set that way.

Now, the HVPS also drives the G2 lines, but again, an overload there could be shown by excessive G2 values, or again, arcing/noise in the 600 volt G2 lines. It's a mystery to me..

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

I'll check tonight which rails the HVPS rely's on, the flow chart is at home.

**Curt Palme** · Posted: Tue May 12, 2009 3:51 pm Post subject:

Nope, no difference. Remember that the resistance of the tube is in essence infinite, all you're doing with the HVPS is charging up three capacitors, that being the 34Kv between the tube on the inside and ground on the outside. Those 3.3K ohm resistors do nothing other than at startup, the circuit doesn't see them once the HV is at full power.