Thread: My 630
View Single Post
  #36  
Old 03-05-2013, 11:14 AM
old_coot88 old_coot88 is offline
VideoKarma Member
 
Join Date: Sep 2009
Posts: 2,645
Quote:
Originally Posted by Geist View Post
...I take it that my Cap is OK, and NOT wired Backwards..
Yes, as long as C220C, the negative supply filter, has its positive end to ground, it is correct.
Quote:
... At present when I am measuring my voltages I have been measuring from Pin 8 of the 5U4 and not from the 275 Volt tap at present.. My DMM is attached to Chassis Ground on one side and pin 8 on the other side..
This is with nothing else (except the filament) connected to pin 8, right?
As mentioned earlier, the meter has to see pure, filtered DC in order to get an accurate reading of the B+ coming out of the 5U4. You mentioned having a 10mf/350V cap available. Did you try jumpering it between pin 8 and ground? This would allow the meter to give a pure, no-load DC reading.
Quote:
..And, Yes, the Center tap on the Transformer is connected to C221 Common can side, which is above and Isolated from ground..
Good. And what is the resistance from that point to ground? It should be the additive resistances of the focus coil, ion trap coil, and bleeder string R185a, R186a, and R186b. It looks like around 500 - 600 ohms. And it should vary slightly with turning the focus control. Does it?

As far as the V and H centering pots, it should take only a few seconds to check 'em with with an ohmeter (on the RX1 scale).

But the very first thing is to establish how much juice is coming out of the 5U4 pin 8.
Reply With Quote