My Brand New CTC-7!

[SwizzyMan]

Originally Posted by DaveWM

two 1600 ohm in p should be 800 ohm total look at the schematic, it drops the 382v to 270v the 382v is at the output of the filter choke and 80uf filter cap.

from there you should see two 1600 ohm resistors, prob large WW types.

One read 809 ohms the other red 810 ohms.

[DaveWM]

well they are connected in p so will read the same value.

That clears the resistors as an issue.

Next if you do not have a cap tester to check 50 uf for leakage, you will need to disconnect it, temp tack in a new one and power up to see if that brings the 270v back up.

C104-b on the RCA schmatic (not shown on the clip from Phil) look for the 50uf section of C104 and check for continuity of the connection to make sure you are disconnecting the correct tab of the can. The schematic show C104-A, this is NOT the one.

you are looking for the SQUARE mark on C104 not the 1/2 circle.

[SwizzyMan]

Originally Posted by DaveWM

well they are connected in p so will read the same value.

That clears the resistors as an issue.

Next if you do not have a cap tester to check 50 uf for leakage, you will need to disconnect it, temp tack in a new one and power up to see if that brings the 270v back up.

C104-b on the RCA schmatic (not shown on the clip from Phil) look for the 50uf section of C104 and check for continuity of the connection to make sure you are disconnecting the correct tab of the can. The schematic show C104-A, this is NOT the one.

you are looking for the SQUARE mark on C104 not the 1/2 circle.

But isnt that a can with multiple values? So how could I just use one 50 uf?

[DaveWM]

disconnect only C104B the Square, connect the disconnected wire to a pos of a 50uf cap neg to ground.

[SwizzyMan]

Originally Posted by DaveWM

disconnect only C104B the Square, connect the disconnected wire to a pos of a 50uf cap neg to ground.

I'd connect the ground to the ground pin on the filter cap? Please bear with my pure stupidity here please.

[DaveWM]

the can is a multi section cap with a common ground. IF the can connected to the chassis then you would connect the neg lead of the 50u cap to ANY place on the chassis. IF the can was not grounded then you would connect the neg lead to the can itself. In this case IF you are looking at the right can (C104) and the right section (B) then you would disconnect any thing connected to the "B" section and and then connect those wires resistors what ever you just disconnected to a pos lead of a 50uf and the neg lead of said 50uf to what ever the can was connected to, IF you are on the right can it would be the chassis.

maybe you should take a hi res pic of what you are doing.

[DaveWM]

this is all just a temp thing to see if that can is bad (or that section anyway).

just tack it on and make sure nothing shorts out, go a quick power us and see if the 270v come back.

If it does then that section is bad, and the whole can should be restuffed.

all of this would not be needed if

you had the proper cap tester OR

just went ahead and restuffed. I prefer to test but if you dont have the correct equipment your options are limited.