ctc12 clone beam current

[timmy]

i dont get something here, the fly shows 1 and 2 but the sams shows the 1 goes to terminal 2 and 2 goes to 1 so they are not reversed because terminal 1 dont go to 1.

[DaveWM]

try wiring it correctly and see, if you are sure of the correct way.

a clue was when you said "the focus coil was wired incorrectly" anytime you find yourself thinking that way and its factory orig, you need to re think it.
do you have the paper work that came with the fly? it should have the wiring diagram on it.

[Username1]

Just take your time and be sure..... Check over a good part or the entire set before putting it back....

.

[timmy]

Originally Posted by DaveWM

try wiring it correctly and see, if you are sure of the correct way.

the sams clearly shows the fly terminal 1 goes to terminal 2 on the focus coil and fly terminal 2 goes to focus terminal 1 so i thought i had it but another dead end because i cant wire it 1 to 1 and 2 to 2 because that would be wrong as it can be confusing with the numbers opposite like this.

[DaveWM]

you need to look at the wiring diagrams that came with the fly and with the coil.
Sams assumes factory replacement parts, Besides Sams can be wrong.

if you dont have the paperwork anymore you can at least ohm out the fly and confirm the order of the terminals starting at the horz out plate cap and working down.

[Username1]

Originally Posted by DaveWM

you need to look at the wiring diagrams that came with the fly and with the coil.
Sams assumes factory replacement parts, Besides Sams can be wrong.

if you dont have the paperwork anymore you can at least ohm out the fly and confirm the order of the terminals starting at the horz out plate cap and working down.

What he means by this, is that if you place one ohm meter lead at the plate,
then each tap on the transformer going away from the plate, should add a few
ohms to the reading.... That way you can identify close taps, and farther away taps....
But everything on that winding needs to be disconnected - it needs to have
all but one lead and the plate out of the circuit.

.

[timmy]

well yes that would be somewhat of a last resort because if i changed the fly and had any different problems then yes i could check it that way but i have the same problem from the old fly and with the new fly. so the 2 terminals being reversed during manufacturing i would think its highly unlikely being the old fly was from what looked like the 80s or could have been earlier, i dont know. so if anything i could check ohms at the 2 wires that go to the focus coil i guess to rule it out but 2 flys, same problem, hmmm. the ohms on the focus coil are ok also. c1 and c2 are in the right position on the centering pot and the wires leading to and from the fly are where they should be . i just jumped to the conclusion that those 2 wires were reversed but they are not both by the sams i have and the rca schematic. back to square one.

[DaveWM]

just make sure the bottom winding is the boost.

btw, where does the blue wire from the yoke connect to?

[timmy]

the bottom winding is by itself from the flyback to the f coil is #1 and # 2 is from the fly also and goes to the f coil but this one has what i believe is the boost and its a red wire coming from under the chassis. if you look at the pics from befor that ctc12 chassis has the red wire also and in the same spot # 2 terminal. the blue wire from the yoke i would have to pull the chassis to follow it but i did some continuity checks and it is where it should be as far as that simple test which i know is not accurate. but i will be pulling the chassis. i check continuity between that blue wire and the 6bk4 and terminal #1 of the focus coil then moves on to terminal #2 of the fly. if im not mistaken the red wire on the fly terminal #2 comes from the damper but not certain until i pull it out.

[DaveWM]

yoke red lead goes to the center term of the horz pos pot.

yoke blue lead goes to the bottom of the fly windings.

PLEASE no other info just confirm that. More later after you confirm.

[timmy]

ok pulled the chassis out alittle to see under it . yes the red yoke i know goes to the centering pot, center leg. the blue yoke wire goes under the chassis to a tie strip which has one of the 1.5 meg resistors its tied to that and also 2 red wires red also tied to that terminal one comes up to the fly terminal #2 which goes to f coil # 1 and the other red runs up to attach to a cap and the one of the coils on the damper. this is confirmed.

[timmy]

and the other leg on the horiz centering pot is a brown wire going to the other coil on the damper. this is confirmed too. i am also comparing what i find to my sams and the rca schematic and its looking the same as i have here.

[andy]

...

[DaveWM]

Next is you need to determine if that lug on the fly is the bottom of the winding, squirrel boy went over this a few post back. and if that is also where the boost voltage (and therefore shunt grid regulator supply) is connected.

[DaveWM]

Originally Posted by timmy

ok pulled the chassis out alittle to see under it . yes the red yoke i know goes to the centering pot, center leg. the blue yoke wire goes under the chassis to a tie strip which has one of the 1.5 meg resistors its tied to that and also 2 red wires red also tied to that terminal one comes up to the fly terminal #2 which goes to f coil # 1 and the other red runs up to attach to a cap and the one of the coils on the damper. this is confirmed.

blue should go to focus coil(w/100k mounted to focus coil),1.5 meg (part of shunt reg circuit),10k(part of boost supply circuit),.12 cap,bottom winding of fly.

BOTTOM WINDING OF FLY NEEDS TO BE CONFIRMED