Lisa 2 (Mac XL) Screen showing multiple images

[Roger Holmes]

Just for a change, I don't want to talk about my ICT 1301.

We are having a clear out at work and I'm taking various bit home  
(like an H.P. DraftMaster MX+ A0/E sized plotter as well as a little  
7475A A3/B size plotter).

There is also a Graphtec MP3200 flatbed plotter. It seems to be all  
there except the plug-in power supply which supplies 7v and 24v DC  
through an unusual 3 pin plug. I don't suppose anyone has a spare  
power supply, or even just the socket ? (or receptacle for US readers)

I've taken my old Lisa 2 home after a few years disuse and tried it  
out. It currently has MacWorks installed on the hard disc and it  
booted fine but the screen has a problem, it shows three smudged menu  
bars equally spaced down the screen and it also has fairly bright fly  
back lines at about 30 degree angles.

I have the official spares kit for it but never went on the training  
course as I programmed them, someone else who has now left the  
company, repaired them.

Is this likely to be a minor logic fault in the video generation  
circuitry, presumably on the I/O board, or there is a small board in  
the spares kit which handles the high tension for the screen, is it  
more likely to be that?

How do I get at the HT board? Do I have to remove the four screws at  
the front of the CRT? It seems unlikely Apple would have made  
engineers do that but how else can I get into the HT enclosure?

Roger Holmes