TV Advice

[Findm-Keepm]

Originally Posted by Console User

The RCA Console TV I have is a 1985 Color Trax 2000. It has the Chasis CTC131 A. The Model of this particular set is GLR2538P.

I was wondering if anyone would have a Schematic on this Chasis to locate the adjustment for the Horizontal and Vertical? It needs adjusting.

Thanks.

For the CTC131 chassis, not much usually went bad beyond the obvious.

As to the vertical, C501 and C510 both were commonly replaced caps in the vertical - a faulty C501 causes shrinkage from the top, and a faulty C510 would cause retrace lines at the top of the pix due to vertical foldover. We swapped them out as a callback preventer.

U700 (the Chroma/Luminance/Video chip) would also cause changing colors as the set warmed up - most noticeably the red. RCA issued a Goldenrod aimed at chasing down other parts that could cause problems, to avoid changing out a good U700. In one test, they had you monitor pin 27 of U700 until the problem appeared - most often it would change to a lower than 5V value if U700 was bad, else some other part was bad. Among the culprits:

R5076 on the CRT board - intermittent opens, cause loss of red in pix.
R5074 on the CRT board - changing green levels, likely intermittent.

Put a scope on all the supplies - the 16.5 volt source filter cap would open up, and cause all sorts of troubles - hum, wavy pix, lines in the picture (also could be the tuner/MST...) and no color.

The CTC131 and 132 were great chassis, just had to weed out a few components...and yes, the CRT is probably tired. Only recourse there is a replacement.