Motorola ts907 low hv

[Username1]

Originally Posted by Yamamaya42

the hot coil problem is most likely due to a faulty C96, But you can't get the exact replacement for it, it may even be what burned r145.

it can be replaced with 2 caps in series,
https://www.mouser.com/ProductDetail...rjw6zMJw%3D%3D
https://www.mouser.com/ProductDetail...EPCXzdjw%3D%3D

this is unrelated to K1
2 3kv caps in series that = 6kv@132pf total

get 2 new 1000v 2amp power diodes at the same time.

Not really square 1, or square 5001. You are making progress......


I was just looking at the schematic & thinking about the hot focus coil too....
But I was wondering about the other part of the circuit....... You know, the
part over by V1 where there has to be a rotten nut.....

I'm wondering about C60, & R87, & R14. At this point any Variable Resistors
should be checked from all 3 pins to ground for a possible internal short, not
just checking to be sure they read their rated resistance.... I still did not see
a post about R23 to be sure there is no short to ground from any of it's pins...
Think about that "tin wiskers" stuff inside these pots.....

Any way poor Timmy being pulled in 30 different directions to check this, and
replace that..... I think he needs a beer....... And if he ain't drinking yet
well then he's a strong determined individual!

The other bad bunch-a nuts can be hiding in that V6 area, where this focus
pulse is going - See that pin 3 with 2.5V on it, and with the scope pic of that
450V P-P wave.... No way you going to be able to figure out what should
really be there..... And that little circuit helps that K1 do it's thing, and it's
attached to V1, or did I say that once already.....


.

[timmy]

Originally Posted by Username1

Not really square 1, or square 5001. You are making progress......


I was just looking at the schematic & thinking about the hot focus coil too....
But I was wondering about the other part of the circuit....... You know, the
part over by V1 where there has to be a rotten nut.....

I'm wondering about C60, & R87, & R14. At this point any Variable Resistors
should be checked from all 3 pins to ground for a possible internal short, not
just checking to be sure they read their rated resistance.... I still did not see
a post about R23 to be sure there is no short to ground from any of it's pins...
Think about that "tin wiskers" stuff inside these pots.....

Any way poor Timmy being pulled in 30 different directions to check this, and
replace that..... I think he needs a beer....... And if he ain't drinking yet
well then he's a strong determined individual!

The other bad bunch-a nuts can be hiding in that V6 area, where this focus
pulse is going - See that pin 3 with 2.5V on it, and with the scope pic of that
450V P-P wave.... No way you going to be able to figure out what should
really be there..... And that little circuit helps that K1 do it's thing, and it's
attached to V1, or did I say that once already.....


.

The agc pot checked already for anything and r23 didn’t check yet but the 2.2pf+25 cap I actually have one coming. And yes I know the agc network is hooked to v1 so with L42 and focus coil getting hot there’s the 2.2pf cap and the 130pf hopefully one of these is the cause.