Asteroids vectors that don't join up properly..

I've got a strange problem with my Alca Planet cab. (Asteroids bootleg).

The vectors don't seem to be long enough and don't join up.

I got the cab all working nicely when the original Toei XY monitor chassis
decided to let some magic smoke out.

Fortunately I had a spare chassis which I put in the cab and all was fine,
except for the fact that the vectors didn't seem to join up properly.

I re-capped the chassis but the problem persisted.

http://hardys.kol.co.nz/asteroids/DSCN4602.JPG shows the problem. The
vectors in the letters are too short.

When I put the pcb into test mode, the corners of the screen don't join up
either.

The asteroids pcb is fine as it was working fine on the original monitor
chassis.

The other problem with the chassis is that the screen randomly expands and
shrinks slightly. It's not a major problem but noticeable. According to the
XY FAQ it's usually the HT diode but I can't find it anywhere on the HT
wire. Hopefully it's not inside the LOPT if this is the problem. (I suppose
I could always transplant the LOPT from the other chassis to see if this is
the problem).

It doesn't seem to matter if the cab has been on for a while as I left it on
for a couple of hours today and no change.

Suggestions?

Thanks

Chris

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Received on Mon Mar 2 06:49:02 2009