Would anyone know where that could be found on the chassis? Thanks. Mark.
CTC 203 heater filament circuit
Oct 19, 2005
4 Replies
Wouldn't it be easiest to just trace it back from the CRT socket?
I'm pretty sure the filament comes from the smps on the 203, not the flyback. In any case, trace the leads from the CRT socket back as James suggests. Easy.
John
The CTC203 chassis is "famous" for no raster/filiaments, caused by a bad connection @ L14401 coil in the horizontal drive circuit. Remove the coil, clean it up, & resolder it. It should be fine. If left too long (while testing it), it will blow the horizontal output, & PWM power supply. Sky.
I'm surpised that you said this, since RCA for decades runs heaters off the fly or horizontal load transformer (seperate H sweep and HV circuits design if used like on DTV306/307.
Cheers, Wizard
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