K4600 resurrection

RtypeEman

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Donor 2017
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I've had this monitor since around 2002, haven't really done anything with it until now.

Back in 2002 it was inside my Galaxian cabinet. Tube had Motos burn on top of Galaxian burn. I'm pretty sure it was the original monitor in the cabinet. For the last 10 years or so, its sat in my garage, which had a roof leak that I was unable to do anything about until recently. During that time, it managed to get necked somehow.
https://i.imgur.com/qcaHVdl.jpg

I found an old Sears Canada tv at the dump, turned out to be Sanyo made with a Canadian made Sanyo tube. Tube number A48JAF51X. Yolk measured around 4 ohms / 11 ohms. Close enough to try without swapping the old one on.
https://i.imgur.com/P7dziDn.jpg

Unfortunately the only issue I was the tube mounts were backwards from the old tube, so I made some spacers from PVC pipe.
https://i.imgur.com/LoRZ2M8.jpg

Chassis was incredibly dirty from its adventures in the leaky garage, so it got a bath in the sink and then dried for multiple days. Still had the vertical collapse, so I spent an hour reflowing every joint on the pcbs.
https://i.imgur.com/E5hXVy7.jpg

I now had a picture! Kinda small...
https://i.imgur.com/Fixhgbc.jpg

Swapped with a known good X-Y board and I had a full picture again! ivanx had a working X-Y board available for sale so I purchased it.
https://i.imgur.com/99DxD8R.jpg

Did a complete recap to the entire thing, with an excellent cap kit from security0001
https://i.imgur.com/xkIRWN2.jpg

A slight pincushion issue, but not that big of an issue once it gets into the Galaxian
https://i.imgur.com/S6wf3ag.jpg

Running my Galaga board on it, it looks great. Too bad pictures of crts always look terrible.
https://i.imgur.com/ZUBnI8C.jpg

Thanks for looking!
 
Nice work. That's a lot of solder joints! When you say reflowed every joint... do you mean you solder-sucked every joint then soldered with fresh solder? Or just added some flux and re-heated each joint?

Still had the vertical collapse, so I spent an hour reflowing every joint on the pcbs.
 
Hi there! I also did a tube swap on a K4600 chassis today. I had an old Coke TV lying around. To make a long story short: it was a huge success, but I also have a slight pincushion issue. I'm using the Coke-TV's yoke. Is it anything we can do about this issue?

Here's the yoke resistances:
Old tube:
H: 2.6Ω
V: 8.3Ω

New tube:
H: 2.3Ω
V: 13.6Ω

Edit: I think I just found the solution: http://forum.arcadecontrols.com/index.php?topic=107682.0
 

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Nice work. That's a lot of solder joints! When you say reflowed every joint... do you mean you solder-sucked every joint then soldered with fresh solder? Or just added some flux and re-heated each joint?

every may have been a bit of an exaggeration but I sucked/resoldered all the headers, and just touched up anything else that looked funky
 
Wow, that looks clean enough to eat off of!

I was going to try putting a 5k pot across the pincushion transformer, but I've run out of time to play with things before Christmas. If you try it, please post results!

Hi there! I also did a tube swap on a K4600 chassis today. I had an old Coke TV lying around. To make a long story short: it was a huge success, but I also have a slight pincushion issue. I'm using the Coke-TV's yoke. Is it anything we can do about this issue?

Here's the yoke resistances:
Old tube:
H: 2.6Ω
V: 8.3Ω

New tube:
H: 2.3Ω
V: 13.6Ω

Edit: I think I just found the solution: http://forum.arcadecontrols.com/index.php?topic=107682.0
 
Wow, that looks clean enough to eat off of!

I was going to try putting a 5k pot across the pincushion transformer, but I've run out of time to play with things before Christmas. If you try it, please post results!
Success! But forget about 5k. I believe the perfect pot value is 33Ω. I tested with several values starting with 3k, but very soon realised that the pot value had to be way lower. Here's a video of my chassis.

https://www.youtube.com/watch?v=XSULrZlqsDM
 
And here's before and after pics of the tube after pincushion adjustment.
 

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Ok, I've done a tube swap on a 4600 with about the same results.

Where exactly are you running the wires for the pot?

I'm confused about the term across the transformer.


Thanks.
Later,
dabone
 
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