Replacing the CRT

[radiotvnut]

I've heard a lot of horror stories about United Parcel Smashers and I don't think I've used them in quite some time. And, I don't think I've gotten a UPS package in a while, either. So, everyone else must be avoiding them. Most of my dealings are either with fedex or the USPS.

[sampson159]

how about some of these other companys?i sent a slector for a seeburg jukebox to oregon.i crated it and it would withstand a bulldozer.i thought.the buyer sent pics of this to me.looks like it was dropped from a plane or space shuttle.79.00 item ruined.i really hate to ship anything these days.

[DaveWM]

all done, went well

removed the chassis, left the tuner as it was a plug in type.
removed the purity, blue lateral as a unit.
removed the dynamic convergence yoke and board as a unit.
removee the yoke.

unbolted the metal shield/degausser removed

layed the console down face first.
unbolted the remaining CRT mount bolts.
Lifted out the crt by the mounts to get a hand under the face then lifted by the face (not neck)

removed clamp around the perimeter of CRT. removed the four mounts with mounting pads.

At first i tried reinstalling the mounts (loosely) 1st and then putting in the crt but that did not work out so...

put the CRT in the bezel, it uses rubber mounts to center the CRT. I put a little dish soap on the bottom two mounts, the CRT then just popped into place perfect fit in the mask (the rubber mounts self aligned it).

next came the mounts, loosely bolted into place, then the band that secures the mounts to the crt. snuged down the mounts then the band.

Tilt the cabinet back up, reinstall the shield, then the yoke, then the convergence yoke, then the blue lateral and finally the purity.

Prob took 45min tops.

spent a while learning how to adj the purity (red screen drive only, pull back yoke, center blob of red with rings, push back yoke for best full red raster)

then did a static converge on center dots (blue screen off, merge red and green, blue screen on bring up vertical, then use blue lateral to merge on the horz plane) followed by dynamic. This did not work as well, no matter what I did I could not get the left side vertical to to converge. The pot that should have done the trick did not seem to have any effect (on anything). So not sure what that is all about. I guess I will have to trouble shoot the convergence board. I will start by checking that pot then any componets around it. I may be able to find another convergence assy to swap out and see if that works. There is not muct too it, just some dipped caps a few resistors and a few diodes.

Green screen drive gave me issues, even with it all the way down it was still green. The drive adj did adj, just not as well as the blue and red.

Guess I should have tried reducing the kine bias to a point but I figured that would just reduce all 3 guns. I need to check the bias voltage at the CRT.

The tracking is not great but I was able to get a decent balance. Its going ot take a lot more setup work before its right assuming I get the convergence and green drive worked out.