Today I began fixing one of the two SEs in my collection. It had terrible screen burn-in, which came from being used in a medical clinic for years long ago. Hard drive is still chugging along -- hard to believe. I remedied the burn-in by swapping the CRT from a dead Mac Plus (itself an upgraded Mac128k).
An SE is better than a Plus, after all, and I have a couple of cards to put in the expansion slot of the little thing. And I have some Mac128k parts (analog board and front bezel, chiefly) to sell on.
The SE now works fine, except that the screen raster is not centred. I gather that this kind of thing is not unusual when CRTs are swapped, and that the need for subsequent adjustment is pretty much a given.
I see from the service manual that centring the display requires that two rings on the yoke be rotated. Tom Lee in his compact Mac repair notes document recommends that this be done with something like a plastic toothbrush handle, taking great care not to touch metal etc., as lethal voltages are present. (The machine needs to be powered on to do this adjustment.)
Question: Is this genuinely dangerous and really best avoided by all but professionals, or is it something that most anyone reasonably handy with tools can do, obviously taking care not to touch any of the aforementioned metal pieces, windings, etc.? I am reasonably experienced with carpentry, among other things, and so am not afraid of tools and tinkering, but I need to know what I am getting into.
Advice from someone who has done this would be welcome. All things considered, I'd rather not kill myself for the sake of an SE.
An SE is better than a Plus, after all, and I have a couple of cards to put in the expansion slot of the little thing. And I have some Mac128k parts (analog board and front bezel, chiefly) to sell on.
The SE now works fine, except that the screen raster is not centred. I gather that this kind of thing is not unusual when CRTs are swapped, and that the need for subsequent adjustment is pretty much a given.
I see from the service manual that centring the display requires that two rings on the yoke be rotated. Tom Lee in his compact Mac repair notes document recommends that this be done with something like a plastic toothbrush handle, taking great care not to touch metal etc., as lethal voltages are present. (The machine needs to be powered on to do this adjustment.)
Question: Is this genuinely dangerous and really best avoided by all but professionals, or is it something that most anyone reasonably handy with tools can do, obviously taking care not to touch any of the aforementioned metal pieces, windings, etc.? I am reasonably experienced with carpentry, among other things, and so am not afraid of tools and tinkering, but I need to know what I am getting into.
Advice from someone who has done this would be welcome. All things considered, I'd rather not kill myself for the sake of an SE.
