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I have an issue with the 2212. The trace DC balance needs adjusting. When the V/Div selector is changed, the grounded trace drops 2/10th , then 3/10th, then 4/10th divisions.
Other scopes have a balance adjust pot somewhere. The balance adjustment on the 2212 is done via a calibration menu on the CRT.
Problem: I cannot bring up the calibration menu.
In the service manual, under Vertical Adjustments/Adjust Balance, instructions read " place cal jumper in cal position, wait for calibration menu on CRT screen." "select Balance to GO"
What I do.
1: Scope power on, normal trace and readouts, move cal jumper, "calibration enabled" flashes, then ....nothing, normal trace and readouts. Wait forever...no change.
2: Scope power off, move cal jumper, scope power on, crosshatch pattern on CRT. Wait, no change. Rotate V/Div one click, crosshatch replaced by normal trace and readouts, "calibration enabled" flashes, then ....nothing, normal trace and readouts. Wait forever...no change.
I am requesting your thoughts and comments. Thanks for your efforts.
- crosshatch pattern
- crosshatch.jpg (71.12 KiB) Viewed 7385 times
- calibration enabled flashes
- calenabled.jpg (46.36 KiB) Viewed 7385 times
I came here with your very same question after facing the same problem; well, I just wanted to calibrate the display, I just got this scope second hand.
I read most of the service manual, googled a lot, and still, I could not figure it out. So I decided to put the calibration on hold (it was actually not that bad, the worst problem was a slightly tilted trace that I could fix manually rotating the pot on the back using the lattice you posted) and decided to play with the ports.
But, somehow I could not put it to rest (defeated by the machine I suppose...) I started pressing buttons by pairs and some funny things started to happen (for instance the Z and SLOPE buttons on the TRIGGER menu change the coupling on channel 1) and then I realized that when you click the RECALL and HOLD buttons on the STORAGE controls at the same time you get a message on the screen "Hardcopy started on parallel port". And if you look at the interface it makes sense: there is a PRNSCR (print screen) text right below these two buttons.
Then I got the breakthrough; if you look a bit more to the right you have a text that says MENU under the SAVE and RECALL buttons on the SETUP menu. I pushed them both at the same time (with the jumper in CAL mode, of course) and I got the calibration screen.
You can see the image below; after you get the screen the rest is pretty obvious.
I was beginning to think there was no way to get to this calibration menu. Once you know it, it seems obvious, I guess that's what they thought when they wrote the manual.
Anyway, it's worthwhile removing the case just to see how premium quality everything is, they don't products like these anymore.
I hope this is useful for your purposes, and if you already figure it out yourself it might be useful for others.
- tek2212_cal_screen1.jpg (573.16 KiB) Viewed 4647 times
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