ataritoobin
Active member
I'm working on a Toei CM-R14 (I compared to the CMA20HC schematic, and it looks to be the same http://arcarc.xmission.com/PDF_Monitors/Toei 19in CMA20HC Manual.pdf) color monitor from a color Space Invaders II cocktail.
It previously worked fine, but now the image is only showing a few pixels vertically in the middle of the screen (keeping in mind the orientation of the monitor). However, the image is not "compressed" in the middle, rather it looks like it's displaying what should be shown, but only a few pixels wide. Attached is a simulation of what it looks like. The PCB has issues of its own but it's definitely a monitor issue.
I've seen this issue with Toei monitors brought up before but have never seen a solution. Seems like it's probably caused by a transistor of sorts. There is no vertical output IC like on some other monitors.
It previously worked fine, but now the image is only showing a few pixels vertically in the middle of the screen (keeping in mind the orientation of the monitor). However, the image is not "compressed" in the middle, rather it looks like it's displaying what should be shown, but only a few pixels wide. Attached is a simulation of what it looks like. The PCB has issues of its own but it's definitely a monitor issue.
I've seen this issue with Toei monitors brought up before but have never seen a solution. Seems like it's probably caused by a transistor of sorts. There is no vertical output IC like on some other monitors.
