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

[cj_reha]

Time to tackle the sweep circuits.



It's a challenge alright! The caps on the PCB weren't so bad, but the point-to-point sections are extraordinarily messy. I keep spotting more caps tucked away behind bigger components.





I ended up needing to remove the power supply choke entirely because a 0.1uF paper cap was tucked behind it and part of the harness. Oh well, it opened up the area a little bit.



Dicey!

Outside of the caps, every single carbon comp resistor I've tested is 30-50% out of spec. It tracks, what with the set obviously having been stored in a high moisture environment for a while. I've defaulted to changing them without testing at this point. Interestingly, the dogbone-type resistors are mostly all OK, within 10% or better; I haven't needed to replace any of those. I suspect they are an early type of deposited carbon film that ages better.

More soon!