Kv-27ts27 color problem

"Joust" bravely wrote to "All" (01 Nov 05 20:46:28)
--- on the heady topic of "Kv-27ts27 color problem"

Jo> From: "Joust" <joust@xxxxxxxxxxxx>
Jo> Xref: core-easynews sci.electronics.repair:347167

Jo> i have a KV-27ts27 made July 1992
Jo> I'm noticing that red is more brown than red.
Jo> i tried adjusting things a bit but not gotten very good results.
Jo> there is no red drive pot. there is a green drive and a blue drive but
Jo> no red.
Jo> there is a red BKG pot and a blue BKG and a green BKG.

Jo> is there a procedure for tuning color? i made a nice colour bar test
Jo> pattern on my PC and use the tvout from the PC into the video 1 input.

Jo> Wish i could get this set tuned up because it works well other than
Jo> the poor colors. there is definately red there so its not a failed
Jo> gun. at least not completely.

Jo> i have replaced the MPX chip in the past.
Jo> any help would be appreciated.
Jo> Joust


The drive pots are for the colour gain, an analogy can be made to an
equalizer control in audio. Only 2 DRIVE pots tells us that the red
gain is fixed. The green and blue pots are used to match up these
colours to the red (both typically set at about 1/4 rotation). The
drive pots are used to set the colour temperature of the bright white.
The other 3 pots are for setting the bias or the low brightness grays.
These usually set initially about 1/3 but then more or less depending
on the health of the colour guns. A weak gun will require more bias
and more drive. At some point though the internal voltages are upset
and the gun will both not focus, and converge properly, or even bloom.

I have a monitor with a bad video processor. Colours are saturated
with good white and nice gray scale but yellow looks beige as if
it didn't have enough red gain.

A*s*i*m*o*v

.... I worked hard to attach the electrodes to it.

.

Loading