Needing to test a 21fjp22...

[kx250rider]

Originally Posted by freakaftr8

Well, I tested the damper and the HO tonight again and checked for shorts.. I noticed that when the HO tube is in the tv it's got a blue glow on the side of the tube.... Not doing it in the tester.. Do you guys know how I can get new power filter caps for the set? Iv'e read up on how someone takes the cans apart and adds them in and reinstalles the can covers.. Kinda cool, but I was hoping to find replacements.. The first cap, has part no. 974576-25 the 2nd 974576-31 the the 3rd 974576-33
Thanks!!

Forget getting new cans... Even if you can find them, they'll be $40 each and will be 40 years old and no better than what you have, most likely. If you get six or seven 80uF @450v single caps, you can install them under the chassis. It's best to disconnect the original can, in case it shorts out. But for testing purposes, you can just clip the new one in with clip leads. All 3 of those cans in a 16 are can-grounded, so you don't have to undo both ends. There are several values, but most of them are 80 @ 450. Those are the hardest to find, but you can always get them from antique Electronic supply in Arizona if you can't get them locally. DONT BUY old surplus ones if you can help it! They go bad from time.

A quick 'n' dirty test for filter caps is to use a VTVM (NOT a regular voltmeter; won't work), and set it on the AC scale... Measure the AC voltage at each can terminal. Set the scale to 500vac, then on each one, set it lower and lower until you get a reading. There should be almost no AC present after a second or two. If there is, that one's probably leaky. You can do the same with a scope. a very slight AC voltage is OK. You just don't want to see 10 or more volts AC in most cases.

Charles