ctc203 continuing problem

[Lenny]

Does anyone have a CTC203CA5 schematic that they might be able to
share? I have a set here that although the screen control will go as
high as 280V the raster stays dark and does not change. I originally
thought it might be a bad flyback but now I suspect perhaps a drive
problem but can't tell where to start. Thanks, Lenny Stein, Barlen
Electronics.

 

[Jason D.]

Does anyone have a CTC203CA5 schematic that they might be able to
share? I have a set here that although the screen control will go as
high as 280V the raster stays dark and does not change. I originally
thought it might be a bad flyback but now I suspect perhaps a drive
problem but can't tell where to start. Thanks, Lenny Stein, Barlen
Electronics.

Did you try this one? Unsolder one end of G2 cap (by that yellow
wire, usually) if not, then pull CRT board from CRT and remeasure?

G2 (screen) goes as high as 300-400V.

There is no external control for the G2 to flyback itself except ABL.

Cheers,

Wizard

 

[ezwizzard]

Does anyone have a CTC203CA5 schematic that they might be able to
share? I have a set here that although the screen control will go as
high as 280V the raster stays dark and does not change. I originally
thought it might be a bad flyback but now I suspect perhaps a drive
problem but can't tell where to start. Thanks, Lenny Stein, Barlen
Electronics.

This sounds like a power supply problem ,open rectifier diode maybe I
would check out the power supply first.