[lei]

Anybody knows what +15V is for in a NEC XG projectors?


Thnaks,Lei

 

[Tinman]

The +15volt line is used by many of the +12 and +5volt regulators on the various boards. Why?


Marc

 

[lei]

Marc,


I've got an error "FC" that refers to "+15V off". The PJ powers up and down every 10 sec or so. Do you know Where should I start?


Thanks.

 

[Tinman]

Try the usual first. Unplug the power connector to the C-drive and F-drive boards. A lot of different boards could pull down the 15volt line.


Marc

 

[lei]

Good suggestion. I have a download PDF service manual, but it's not searchable, therefore hard to use. Could you point me to the C-drive and the F-drive boards? right now, the lid is off, and I lift up the top board assembly also. It seems to me that the PS is underneath the lenses, am I right?

 

[Tinman]

The PS is under the lenses. The C-drive and F-drive boards are the 2 boards standing up between the tubes. They have the famous STK392-40 chips on them.

 

[lei]

Okay, I can see those thick film integrated STK's. Thanks again.

 

[Tinman]

That would be my first guess. Unplug them and see what happens.

If the unit fires up, turn it off and plug one back in to eliminate. If it is not caused by either, You may have to check the PS.