WG6100 B+ = 196v!

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Hi;
I rebuilt a WG6100 HV cage, all recommended components replaced (FAQs) as well as some transistors and resistors. Problem is that the B+ is 196v and even thought the "screen" is turned all the way down, the display comes up bright, washed out and I dare not leave it on for more than a second or so without fear of burning the CRT.

I checked good but replaced anyway, Q901, 902, 903 and ZD902; swapped a working Q900; replaced the "555" and still the 196v......

Tested R903, 904, 905, 906 and 907 - all good.

I did not pull but compared all replaced capacitors (with an ohm meter) to a pulled working HV cage and they were all basically the same.

I have spent several HOURS on this and am coming to my wits end.

Can anyone help?

Thanks in advance
Jeff
 
If you swap the deflection board, does that change anything? I had one once run at 300vdc due to a bad resistor on the deflection board.

BTW - if you put the other HV cage in here, does it run perfect B+?
 
Yes, I put the good - working one in the monitor and the display is perfect.
I did not try swapping deflections PCCs' though, maybe I'll give that a try as well, as I have tried everything else at this point, (well I guess not really everything or it would be fixed by now).
Thanks
Jeff
 
Well if you got perfect B+ with a different HV cage - and everything else the same - then the HV cage is most likely the issue. Did you change that transistor on the outside?
 
I agree, the problem does originate from the HV cage.

There are 2 "outside" transistors. Q900 I swapped with a known good and had the same results. The BU bottlecap transistor I did not pull, I placed the working and non-working HV cages side by side and took readings comparing the two and the readouts were the same, so I thought that it was OK..... Unless of course, that method of testing does not work and then I will have to pull it to test, which I will do ASAP just to prove it good or not.

I'll update after I test it out of circuit.

Jeff
 
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