NEC XG Series
Layout and Setup Tips
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The above photo shows the insides of the XG chassis, and identifies the 4 PC
boards that slide out of the back of the set. There is one Philips screw that
holds each board into place at the rear of each PC board, near the CRT sockets.
Once the ribbon cable is unplugged from each board and the screw is taken out,
each board will slide out the rear of the set. It’s usually easier to replace
the machine Philips screw with a self tapping screw, as the small machine screws
are a headache to reinstall.
Again, there are very few user adjustment trimpots on the XG model. The trimpots
that are exposed on the card cage that houses the system control and video
boards MUST be adjusted in conjunction with the service manual. Failure to do
so, and you’ve now ‘created’ a set that needs to be sent to a service shop to be
calibrated. This simply cannot be stressed enough with the NEC PG and XG
As for the 4 boards that sit between the tubes, an actual failure is rare on
these boards. While the STK chips do occasionally fail causing assorted
problems, these boards are double sided and can easily be damaged if you do not
have the proper desoldering equipment to take the components off of these
boards. I treat the NEC boards as exchange units only. There are no internal
fuses or adjustments on any of these boards, so I am only identifying the layout
of these boards. Should you have problems with an XG projector, contact me, and
we can go through a troubleshooting procedure via the phone or email.