Sanyo 'Pro Xtrax' Projector power issue

[jona1984]

I'm sure I've had this issue before on other Sanyo projectors (XP56s etc...)

 

Basically, our permanently installed Sanyo Pro Xtrax projector has a strange issue whereby after it's been left on standby for a while or had hard power turned off/back on again from the breaker board, it will fail to power back to 'standby' mode (no lights on whatsoever) and we are unable to turn it on from the remote or the switch on the unit itself. By climbing up to our rig and manually removing/replacing the IEC power lead (with about a 5-10 minute gap in between) we've managed to restore power multiple times and have it turn back on again.

 

I've had this happen in other Sanyo multiverse projectors but there I think I remember re-seating the lamp housing before power would come back through the system. We thought maybe it was a lamp issue but after replacing the lamp the problem still arises. It's easily fixable, so we'd rather not send it off for a pricey overhaul, but it does mean getting our large Zarges ladder out every week and climbing up to the rig to remove/replace the kettle lead....

 

For now, I've taped over the breaker switch in our dimmer room to keep power to the unit at all times (in standby) in the hope that without cycling the power this will stop happening, but it's more of a short-term fix and I'd rather find the cause of the problem long-term.

 

Any suggestions anyone??

[DrV]

A couple fairly random thoughts - if the power supply itself is not starting up then I'd be looking first at the bootstrap capacitor. That's the capacitor which is the reservoir for the supply to the control chip in the PSU. Only really any use if you're into repairing switch-mode power supplies tho!

 

The other thought is even more esoteric and that is that the power-on reset circuit is failing for some reason. But then you really are getting deep into the electronics and my limited experience of projectors is that generally they about the most difficult pieces of gear to work on of the lot

 

Sorry - not much help at all really...

 

Dave

[jona1984]

Thanks Dave; yeah I rememebr when I had issues with previous models somebody a lot cleverer than myself trying to explain to me how a switch-mode power supply works....!! But yeah, it's not really within my abilities to repair stuff like that!

 

As an update, we left the power breaker on all week and it's been fine.... Not a long-term fix but it'll do for now. If we have time to send it away I will. I rememebr sending ours to a company in Leeds or Sheffield or somewhere up that way that did a great job...