Sanyo EZ-20 Shut Down

Peale

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Received an EZ-20 chassis. Started off by capping it, and right before I was going to put it on a tube to fire it up noted a huge burn mark on the fly. Ordered a new one, it arrived today. Installed on chassis. Tested it on tube, and it fires up for a second or two, then shuts down.

In those couple seconds I metered the B+, and it's nearly spot-on 108. When it shuts down it goes all the way up to ~140.

Ideas of places to check?
 
I just found the EZ Troubleshooting Guide. Pouring over it now. I'm guessing something in the high voltage area isn't happy.
 
I'm leaning toward TR901 being bad. A D1090. The only other one I have is from my own personal chassis. And as luck would have it, I left my solder sucker at home. I'll try again tomorrow.
 
Oh, I forgot to mention: I turned the B+ pot all the way down. Got the monitor to fire up, but of course very dim, tiny picture. B+ @ 78V. Got it up to 90 when it shut down and the voltage leaped back to 140.
 
The one I noted above. Okay, that's good, I can pull it off my working chassis and replace it later if that fixes it.
 
Any place I actually heard of?

Give Electronix a try. They will give you better service than any of the big supply houses. They ship within 24 hours and will actually call if something is out of stock. They have the 2SD870 HOT that will work with the 20EZ/G07/4600 for 89 cents each.
 
I've ordered from Electronix before as well.
They have had the best deal on some otherwise expensive components for a few things I've worked on. Great service. Shipping was pretty dang fast as well.
 
Not Q901 or TR601. Swapped both with ones from a working monitor.

Then I got the idea to swap out the filter cap. Now I can't adjust the B+ at all.
 
B+ adjustment pot broke in two pieces, so I replaced it.

No change; still can't adjust the B+.

Before someone asks, the flyback is brand new.
 
Ended up purchasing from Electronix. Bought 2x D1090 and 2xA5114N.

Metered the D1090.../definitely/ bad. While I was at it, replaced teh A5114N.

Fired it up...B+ @ 105! All right! Or so I thought. Still couldn't adjust it. Tried a few other things, then it started going into HV shutdown. Got it to stop doing that, and that's when I noted the picture waving like a flag. Yep...killed the A5114. Ouch. They're not cheap. Luckily I got two of them.

So I'm not firing this up again until I have some idea of what to look at next, I'm out of A5114s!
 
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