Back to Blog
Adjusting apple color monitor6/4/2023 ![]() ![]() Even with the right tools, with my bad heart, I worry every time I start to work on one of these beasties. flyback discharge wands, and electricaician's gloves), to work on these? If you do not, then please, please, invest in the correct tools first, never try to work on a CRT without proper ischarging using a real diacharge wand. In that regard, if you can detail the issues on the CRTs that are dead, we may be able to direct you on how to repair some of them.ĭo you have appropriate equipment (e.g. With tose, there is nothing magical or alien happening in them that typically requires a schematic, which is likely why there aren't any in the archives. You pretty much need to know what to look for, and have a general understanding of CRT repair to work on them. I can provide at least three service manuals for these displays, but none of them have a proper schematic. Thus, unlike say, Franklin, Atari or CBM manuals, they didn't include component-level schematics with their service manuals. Their policy was 'replace the entire board', not 'do component level repairs'. The main issue with Apple, is that-even to service sources-they didn't provide schematics. The point here, is thst they existed, and likely still exist, as they were available for purchase. ![]() Hence, I say, IDK u they are valid, and IDR if this si the same Steve Baker who worked for Atarisoft, or not. Even with the power off, you can get the shock that you will never forget. DO NOT even go near the +B drive circuitry while the power is on. PLEASE NOTE: You will see a fat single wire going to the front of the CRT (top or side), that is the high voltage B+ line. Or you brought the bunch to Radio Shack for testing. If you did not own a tube tester, then you just swapped tubes until the set worked. Vacuum tubes were so much easier to deal with. Sorry but there is no easily way to troubleshoot this. Most people will not be comfortable doing this experiment. If you start seeing green, then the CRT is good. This will tell you if the problem is related to the CRT or the driver circuit. You will probably have to swap both the cathode and grid leads. Otherwise, you will need an oscilloscope to trace the signals going to the grids of the CRT.Ĭan you see the three cathodes glowing on the back of the neck?Ĭan you locate a part number on the boob tube? If you can, plug this number into a search engine and see if you can find a pinout for the neck. You might get lucky with a DC volt meter if there is a simple biasing problem. Before we begin any colour calibration, ensure your Mac is in your preferred work environment and the room is a dark as possible - turn off any lights and close any blinds or curtains. The schematic might be on the web along with troubleshooting hints for common problems. There’s two methods of calibrating your Mac’s display: By eye. The schematic is a must have for this type of trouble shooting. Did you buy this recently? Did it work before shipping? If so, file an insurance claim before time runs out. ![]()
0 Comments
Read More
Leave a Reply. |