Amplifone and WG6100 PCB sets exchangable ?

OK, I'm trying to write this as simple and efficient as possible. A
friend has two Star Wars machines:

1) Upright, 19" Amplifone 19" CRT, blue HV pcb, green deflection PCB.
All serial numbers are different so there's been a lot of hacking
around.
-100% working PCB set

2) Cockpit. Amplifone 25" CRT, with a WG6100 chassis. ( I am pretty
sure it's an "Amplifone CRT", because it has the same label as the one
in my cockpit.
- 100% DEAD PCB set

Now the upright is working, although not without problems (jittery
picture, problems with starting up). It has the original red HVT so
this could be acting up. But at least it works...

The cockpit was completely dead. My friend said it worked for a day,
then died. I replaced the PCB set with the one from the upright, and
now we had a half-picture on the CRT.

Since I've read that the Amplifone and 6100 should be interchangeable
I suggested to move the Amplifone boards to the cockpit. We did. I
made one mistake (thinking back about it now) and that was not hooking
up the dag-ground. I also did not connect the degaussing because it
has a different connector and I thought that was not important for
testing it.

When I turned it on, we had no picture, and there was a small bit of
smoke coming from the deflection board. Instantly turned it off again.
I couldn't see any obviously fried component.

Put the Amplifone boards back into the upright and got it working
again there....it does have some starting up problems, but I bet this
it a bad Big Blue. It kinda "hicked" up until it worked...

Questions:
1) are the Amplifone "chassis" and WG6100 completely exchangeable ?
All the connectors are the same (except the degaussing)
2) could that smoke be happening because the dag ground not being
connected ?
3) what part could have been smoking (the board still works !)
4) does the 25" CRT draw more current than the 19" (HVT/Deflection
wise) ? I am also asking this because the HV board doesn't have the
usual extra resistors to deliver the higher required currents for the
SW game.I bet this HV board came from stock or another game.
5) I checked all chassis transistors on the WG chassis. Any other
cause for it to only draw the top-half of the screen ?

Sorry for so many questions at once....

André Huijts
andre.huijts@wanadoo.nl

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Received on Sun Feb 24 16:02:17 2008