I've had this monitor for a few years, and I thought was dead because when I first got it (I bought it cheap as a parts monitor) I plugged it in to my SPO machine and didn't see anything, so I put it away. I decided to mess with it tonight, and as it turns out, it needed the screen pot to be turned up a bit.
The colors were all screwy and it had some vertical collapse (still has its factory capacitors). I got the colors adjusted pretty good, and then I tested B+, and it was 108.3 VDC. So about 10 minutes later I was adjusting the focus pot, and I got it pretty well focused. Then I was adjusting it a little more and I heard a very faint snap or tick sound and the screen turned off at the same time that it made that sound. I thought maybe it had blown a fuse, but both fuses are good. Now B+ is reading 136 VDC and there is no raster. Any ideas about what happened?
Edit: Following the flowchart that Ken Layton posted:
No raster > Is CRT heater on? > No > Check voltage at TP91 > 136V > Is the voltage at pin 9 of IC401 approx. 0.6V > No (0.0V) > Check H-osc, H-drive, H-output circuits
So what are those and how do I check them?
The colors were all screwy and it had some vertical collapse (still has its factory capacitors). I got the colors adjusted pretty good, and then I tested B+, and it was 108.3 VDC. So about 10 minutes later I was adjusting the focus pot, and I got it pretty well focused. Then I was adjusting it a little more and I heard a very faint snap or tick sound and the screen turned off at the same time that it made that sound. I thought maybe it had blown a fuse, but both fuses are good. Now B+ is reading 136 VDC and there is no raster. Any ideas about what happened?
Edit: Following the flowchart that Ken Layton posted:
No raster > Is CRT heater on? > No > Check voltage at TP91 > 136V > Is the voltage at pin 9 of IC401 approx. 0.6V > No (0.0V) > Check H-osc, H-drive, H-output circuits
So what are those and how do I check them?