G07 - Width cap killed HOT??

jetusenet

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Hi;
"Tweaking" a G07 (fully rebuilt and working) in which the pic was just too wide so I paralleled a .22uF to the existing .55uF @ C515 and fired it up - dead.
Checked the B+ and it's 167v.........
Why did this happen????

Anyway, I am going to pull the chassis, removed the additional cap and replace the HOT and see how it goes.

This "hobby" just takes up more and more of my time. AHHHHHH!

Jeff
 
Another thing, it's been some time since I had to replace a width cap on a G07 chassis but I don't remember ever having to pull one of those "blue" ones, it was always a "brownie".
The width cap is the C515 right!?!?
 
if it killed the Hot, it probably blew the B+ fuse.. Its possible it just was time for it to go, especially if you put a new flyback, and no new hot.. Everytime I replace a bad fly, and I think, oh the hot is testing fine, I get the chassis back in a week or two with a dead hot. Im a slow learner...
 
C515 is the width range cap. It is supposed to be a Metalized Polypropylene type.

If you replace it with the wrong type of capacitor, you can blow the horizontal section of the circuit. Likewise if the values you used are out of range of the circuit design.
 
C515 is the width range cap. It is supposed to be a Metalized Polypropylene type.

If you replace it with the wrong type of capacitor, you can blow the horizontal section of the circuit. Likewise if the values you used are out of range of the circuit design.

Another "notable" thought is that I do not remember using a cap over .47uF in that position, or on any chassis for that matter. I thought that the .55uF was rather high but figured that I would try and dial in the display, as I cannot see the scores on the top of the screen, even with the width adjustment made. The most likely cause of this failure must be that it is "out of range" as I replaced both the VR and the HOT during the original rebuild.

All fuses tested good as well.........

One step forward and two steps back.......

Thanks for the input, I did not get back to the chassis, I decided to calm down with a couple of Brooklyn Lagers..... There's always tomorrow and if not, then it just does not matter, does it?

Thanks
Jeff
 
Ken;
Thank you for "talking me down" last night, much appreciated.
I am back on track and will see what I did to this chassis and update the post once completed.
Jeff
 
Uh Oh.......

I replaced the HOT and still no HV and the B+ is 166vdc and not adjustable.

The fuses are good....

Has anyone else had an issue like this??

Thanks in advance
Jeff
 
Update:
I tested the HOT which I removed and it tested good, I'll leave the replacement in as it is a new one as well.......

-----still suffering------
 
Well, I guess it's time to take a break.....

I found another G07 chassis that I had rebuilt quite some time ago and thought I'd give it try........ Pulled the "killed" one and installed the rebuilt, fired it up,,,,, aaaaaaaand - line down the center of the screen! I have proper HV and B+ but just a vertical line (long ways) down the center of the screen ------

I did some searching of the forums for vertical deflection loss and have a few ideas that I have to try out. Now I have 2 chassis that I have to troubleshoot.....

Anyway, can anyone think of what might have been damaged when I screwed up the width cap specs on my original chassis problem????

Thanks again and CHEERS!
Jeff
 
Last edited:
UPDATE:
On the chassis with the line down the center, found R522 open, replaced and got pic!
Problem now is that it won't stop rolling.
Where the heck is the horizontal hold !?!?!?!? ;-)
Anyway, I know the board is good as well as the connections so once again, back to the bench.

I still have not figured out what was damaged on the other chassis when I replaced the width cap - any suggestions - ideas - anything!.....

Thanks
Jeff
 
Ken;
Now that you mentioned that, a funny thing happens when I try to stabilize the pic with the horiz freq, it acts like horiz width control and squeezes the pic. It has no effect on stopping the roll.
Jeff
 
BTW, just so I know if I was right or not, which one of these circuits is the horiz, the parallel or the series coils??
Thanks again
Jeff
 

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