Do you sell Monitor Adjusting Tools for the Color Classic
I'm in need of the plastic Monitor Adjusting Tools for the Color Classic.
Do you sell these or can recommend where I can obtain a set?
The Macintosh Color Classic was the color all-in-one Mac in the early 1990's
CRT discharge tools are not in high demand, so it isn't easy to find one that's designed for it. While this is very much the case, you can use a flathead screwdriver and a heavy gauge wire with alligator clips on both ends. As long as it can handle 15-25,000 volts, it’ll work. If you have them, use car jumper cables; that will take it without a problem. It’s usually 15,000 volts for small CRT’s and 25,000 volts for the larger sets. This CAN KILL you.
The most critical advice I can give you is to use an electricians screwdriver as a safety net. Yes, these are expensive but it’s better then dying because you used a cheap screwdriver with little to no rubber on the handle. This is the one thing I’m not going to budge on. I’d also recommend electrician gloves as another safety net that can save your life in the worst case scenario.
The big thing is to find the service manual to figure out what each adjustment does, as the points are unlabeled. Get it wrong and it’ll NEVER be right again without hours of tinkering. The main reason to do this is to adjust the system to compensate for the wear of the CRT as it ages. If you keep having to do it, the actual CRT is in need of replacement and is worn out.
If you have to replace it, do not settle; find a good one with few hours and no burn-in. Used ones with heavy use and burn-in should be considered scrap as these typically do not last very long.
©2000 Thomas H. Lee, rev. May 31, 2007; All rights reserved
5.2 Height and Width
If you want the screen to provide true WYSIWYG so that 1” on the display corresponds to 1” in real life, then its dimensions must be precise, or 4.75” x 7.11”, to be more exact (that’s 342x512 pixels at 72 pixels per inch). Unlike the other four adjustments, adjusting the width requires a hexagonal tool made of a NONCONDUCTIVE, NONMAGNETIC material. You can get these tools at places like Radio Shack, where a suitable one is sold as a tuner alignment tool. You can make a serviceable one out of a whittled down wooden chopstick or some similar material. If you use a cheap chopstick, you don’t have to do much work at all. Cheap chopstick wood is soft, so tapering it enough to allow gently jam- ming it into the core of the control is usually good enough. It will conform to the shape of the core well enough to do the job.
The reason for the nonconductivity requirement is that the control is actually a ferrite core inside an inductor carrying large alternating currents. The AC field would induce large currents in a conductive tool, and make it get incredibly hot very quickly, to say nothing of invalidating the adjustment. At the same time, the increased strain that this places on the circuits could cause damage. So, wood or plastic it should be. Once you have the tools, you can save time by tweaking the height to 4.75” and then adjusting the width until diag- onal rows of raster dots are at right angles to each other. A piece of paper or a floppy disk or any other handy object with right angles will do as a good template for this purpose.
If you don’t care about WYSIWYG, then just making the dots at right angles is good enough to preserve proper aspect ratio.