i86time
Well-known member
I picked up my first B&W a few weeks back. The 22V1003 monitor had a slight issue where it would take about 10 seconds before it showed an image and 5+ minutes or so to come into focus. It requires the focus to be turned up all the way, voltage was around 530 VDC, which I guess is OK and within spec. There was also some jitter to the it after being on for about a half hour.
I went ahead and did a cap kit, minus the PITA multi-value filter cap. Afterwards it still took about 10 secs or so before an image shows up, but then when it does the image is in focus for about 1 second before it goes all the way out of focus (more so than when the focus knob is at minimum) and then slowly (over a minute or two, so faster than before) comes back into focus, but the focus knob still needs to be all the way at max. Before I even did the cap kit I saw from the schematic that the cap for the focus voltage was in the multi-value cap, so I guess I was expecting too much . I tested each cap in the filter and found the ESR for each was OK, but the ripple for the focus was 0.27 VAC and for the 75v filter it was 0.6 VAC, while the other two caps were 0.03 VAC and 0 VAC.
The jitter has not come back, but I suspect it was due to the vertical size pot as after the cap kit the pic was smaller and when I adjusted it, it bounced the picture all over the place until I hit it with some deoxit.
So I went ahead and replaced all the filter caps. However, it still does the same thing, in focus briefly, then all the way out of focus, slowly coming back to focus. Is this normal for this monitor? I just want to make sure there isn't something I'm missing, as I don't want to do anything which might shorten the life of the tube or other components.
I went ahead and did a cap kit, minus the PITA multi-value filter cap. Afterwards it still took about 10 secs or so before an image shows up, but then when it does the image is in focus for about 1 second before it goes all the way out of focus (more so than when the focus knob is at minimum) and then slowly (over a minute or two, so faster than before) comes back into focus, but the focus knob still needs to be all the way at max. Before I even did the cap kit I saw from the schematic that the cap for the focus voltage was in the multi-value cap, so I guess I was expecting too much . I tested each cap in the filter and found the ESR for each was OK, but the ripple for the focus was 0.27 VAC and for the 75v filter it was 0.6 VAC, while the other two caps were 0.03 VAC and 0 VAC.
The jitter has not come back, but I suspect it was due to the vertical size pot as after the cap kit the pic was smaller and when I adjusted it, it bounced the picture all over the place until I hit it with some deoxit.
So I went ahead and replaced all the filter caps. However, it still does the same thing, in focus briefly, then all the way out of focus, slowly coming back to focus. Is this normal for this monitor? I just want to make sure there isn't something I'm missing, as I don't want to do anything which might shorten the life of the tube or other components.
