I rebuilt my k6100 and now I'm not getting any vertical deflection. Bummer.

jehuie

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I rebuilt my k6100 and now I'm not getting any vertical deflection. Bummer.

The monitor was working but the image was a bit meh, so I ordered the full Bob Roberts deluxe kit and an LV2000. Spent the last couple nights cleaning everything up, installed the LV2000 and most of the stuff from Bob's kit. Not everything since the LV2000 replaces some of it.

Finally got it all together today and fired her up. And I get a line across the middle of the screen (with some movement). Errrr.....missing the vertical deflection now. Could be a gazillion places. Crud.

Anyone want to guess what I did wrong and tell me where you would start looking?

Thanks!
 
Yep. They were all part of the BR kit. I checked them as I put them in to be sure they were not grounded against the chassis. I haven't yet tested them all to see if they are getting the + or - 30 volts. I'll check that next. Someone also mentioned that the wires on the chassis mount transistors sometimes break off so I'll inspect those as well. Anything else to look for while I've got it back out?
 
Well, the wires on the chassis mount transistors all appear ok. I checked the voltages on each of the ones I could reach (one is under the deflection board) for proper voltage. According to the faq, I should get +/- 30 Volts DC when I measure between the top of the transistor and the chassis (ground). One of them I do get 30 volts. But the others are all measuring closer to 25 volts. Is this a problem?

Edit: Oh, and the spot-killer light is on.
 
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Yep. Everything worked ok prior to doing the Bob Roberts upgrade kit and LV2000 addition. The image just wasn't as crisp as I would have liked so I fixed it. :)

I've "fixed" a few monitors that way :p

Can you list the parts you replaced?

Did you replace Q800, Q801, or Q802?

I had an issue on an Asteroids monitor where the Spot Killer was on even though I had deflection, and it was because the new transistor I used had the collector and emitter reversed. So I had to put it in the opposite direction of what the original one was.

I assume you double checked that the frame mounted transistors are the right types? i.e. you didn't swap a 2N3716 with a 2N3792?
 
Check the sockets of the frame mounted transistors, they tend to oxidize and the legs don't get good contact. Has to be something simple like that. Look at the xy faq and check the sockets that would cause the top and bottom to collapse. Sounds like two transistors are either bad or not making proper contact.
 
I'll check the continuity on the sockets. Actually, maybe I'll swap in the deflection board from another machine first to see if that works. Might help narrow down the problem. Seems unlikely that two sockets could go bad at the same time but who knows.

Also, I mentioned in another thread that R106 was missing on this board when I got it but it seemed to be working. So I did not add R106 back on. Should I go ahead and add it? I checked the FAQ but didn't see anything about a version that is supposed to be missing that resistor.

I'll get the list of parts swapped tonight and list them here. I don't remember specific transistors that were swapped out off the top of my head.
 
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