|
OK, an update on the G2000.
Thanks to Roundscreen for some tips to look for!
I ran the test procedure for HV to check the Quadrupler. With the kine connector removed from the crt as described, I checked the HV anode and only was showing 2kv at the hv anode. I removed the bleeder resistor from the anode bundle and still, only 2kv. I then checked for voltage on the F (focus) connection on the quadrupler and there were 0 volt where there should have been 2.5-4.5 kv. Now, all that being said assumes good SCR's. With the little bit of a makeshift tester I had for the SCR's, they appear to be the culprit or at least part of the problem. But it is also possible that the quadrupler just failed. But I have heard that when these typically go, they go fairly catastrophically and visibly (ie: arcing, cracking, melting a bit, etc). But in my experience with other "module" style sealed components this is not always the case.
The only cap I have replaced in this set thus far is that axial 250uf 175v electrolitic which sits right underneath the flyback (C108). I had to make up a cap of that value from 3 smaller caps (2, 100uf and 1 47uf +-20%), they test out at 249.5 so I figure that is pretty darn close. While the original electrolytic was just at the upper range of the 20% rating, I just make it a policy to replace old electrolytics like this and paper/wax caps because I know they will fail and this chassis is no fun to remove from the cabinet so I figured I would change it out while I was there. I have not yet, however, replaced the three can electrolytics. They are running cool and check out ok so I am leaving those be for now. But I know they will have to be changed out eventually.
Roundscreen led me to some possibilities on the vertical issue I have. Question, can transistors be tested for shorts while in circuit? I know caps and resistors can't be accurately checked in circuit.
Anyway, I will be ordering the SCR's and we will see what happens.
Roy
|