Mitsubishi 6CT-333 "Trinescope" color projection TV restoration

[cj_reha]

Merry Christmas everyone!

The rebuild begins! I decided I'm going to start with the HV/sweep/power supply circuits. They are the most cramped parts of the set and it's probably a good idea to get the annoying stuff done first.





As I suspected, I had to remove the flyback and HV rectifier assembly. Look at all the parts underneath! I quickly discovered something interesting: every single connection in the set is tack soldered together. Most of the time they did not even bother to thread wires or component leads through the terminal lugs; they literally laid them down and blobbed solder on top. I guess I don't mind, it certainly makes part removal a lot easier



Some of the soldering conditions are...sub-optimal.



Phenolic assembly out. It contains three 0.5uF paper caps and two of the three 200uF nonpolar electrolytics used for coupling in the centering and height/linearity circuits. The third 'lytic is mounted by itself in a separate area; I replaced that one using a terminal strip.



More vintage Chemi-Con caps! They felt extremely light and dried out, and tested poorly. I'm glad I replaced them.



Paralleled two nonpolar 100uF's together; it's all I have on hand at the moment. Should work fine.





Restuffing the three 2000uF electrolytics in parallel with the centering controls. It keeps at least a little bit of the set original, and I don't need to engineer anything fancy for reinstallation



All done! Far from perfect, but it's as neat as I could make it, and it's a little bit cleaner than it used to be. I didn't quite realize how filthy this set is until I started cleaning wires and the chassis. Whatever kind of grime is built up on everything is fairly resistant to my usual degreasers, it's requiring lots and lots of scrubbing to remove. Oh well...glad it's done. This set makes all the Predictas I've done look like a walk in the park!

In the next few days, I'll be tackling the deflection circuits...



Wish me luck!