Thanks KyaKatKya wrote:Hello.
First off, service manual; While I'm not readily aware of a manual for the 1344Q specifically, I do however have one for the 1444QM, which is the "Everywhere else" version of the America specific 1344. Nearly everything in it should carry over verbatim, with the exception of some potential changes to the power supply. Pay no mind to the silly filehost : PVM-1440QM, 1442QM, 1444QM Service Manual
The diagonal lines do appear to be retrace lines; These come from the gun not turning all the way off during the retrace of the screen as it journeys back up to the top left of the screen after drawing a field. Given that only red lines seem to be appearing, it can be assumed that only the red gun (should) need adjusted. Refer to Page 15 "3-4 White Balance" part 4 specifically, potentiometer(variable resistor) RV1705 should potentially be turned down slightly. This should (hopefully) solve the retrace line issue and possibly lessen your smearing at least for now. In regards to the "Is it G2 or Screen?" question, they two are exactly the same; G2 = Grid 2 = Screen Voltage = Screen.
Given that this monitor is 30 years old, a good portion of the capacitors in it have very likely drifted out of spec and are the actual cause of the problem. Drift could explain why what may have previously been a perfectly fine Red cathode voltage is now too much, and is extremely likely the cause of the smearing; If I had to guess on where the issue is, it'd be either drifting caps in the later portion of the red signal path leading to dirty/uneven power or even a faulty transistor responsible for the final amplification before being fed into the tube. A quick glance in the service manual shows that it's using discrete transistors for each color rather than a ganged triple amplifier on many TVs and the like, which could also be related to why you're only having issues with red and not all three at once.
Depending on how much time/labor/etc you're willing to invest, looking into having it just recapped in general would likely be the best direction to head, but the above focus would be were I'd suggest starting out to directly affect the current issues you're having.
For cleaning, a can of compressed air would be fine, but if you're dealing with an air compressor, you'd need something to deal with potential ESD build up as well as condensation.
I have tweaked the "Screen" pot slightly, and that solved the issue! (Woohoo!)
the red bias on the front is set at minimum while G and B are eiher at mid-position or almost max(i did this by eye. I should get the 240p suite). so looks like red voltage as drifted.
I will get the monitor recapped at some point. for now it looks good
Thanks for the service manual! I didn't know 1444 was the international version of mine