CTC169PK

[Lenny]

This set has the "works" in a box. It was removed by the customer and
he brought it in. I determined by pulling the second anode lead out of
the HV splitter and extending it that there is HV. My probe only goes
to 30K though and its pegged so I don't know exactly what the voltage
is. When I turn up the blue and red screen controls, (I could have
done that first before pulling the HV lead), I can see those tubes
glow with retrace lines but the green does nothing. I have not done
much projection work and would really appreciate some assistance here
by anyone who may be familiar with these. Not really sure how to
proceed on this one. The audio is OK. Thanks very much for any help.
Lenny Stein, Barlen Electronics.

 

[JURB6006]

If you unplug the splitter the HV will be high due to the lack of feedback,
it'll max but it won't shutdown. When it's hooked up you got got red and blue
rasters so it isn't shorted.

Had a few focus/screen assemblies go bad recently. You can confirm by switching
the output leads for the green with another tube, or by voltage measurments. It
might also cut off the picture through the ABL ckt if it's partially shorted.
Also don't forget the little G2 caps on the CRT boards, unlike a direct view
they are seperate for each color.

After you eliminate the projection specific parts you are dealing with a run of
the mill CTC169. Also, the pictures on the CRTs should have straight sides and
not be overscanning, if they are you might need that .056/400V cap or a PIN
modulator. You could look into that now if you're in the estimate stage. We
find alot of these runniing wide and pincushioned on the sides, but the
customer watched it that way until it died completely. If it is the .056 it
will cause eventual failure of the HOT.

JURB