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MTC9000 red color too dominant
sollima:
Hello,
I have a MTC9000 that a gave a complete capkit. Even the poly are replaced.
I had some brightness issue, that it was a bit dimm. I replaced R90, R80, RV7, R216 and all the pods on the neckcard. It helped a bit. (I replaced R216 with a 1 Ohm resistor that was in the manual because it was higher than 1 Ohm. I saw a post in which Grantspain stated to use a 0,33 Ohm
Side question: would that give more brightness? Or probably damage the heaters?
Reply #6)
If I turn on the monitor and try to set the brightness and colors I can adjust them all. They are all responsive to the gain and cut-off (the others more than red), and I have a little bit of brightness control. The problem is my red. It responds the least of them all and when I dial it back to its minimum it still stays too bright/strong.
When I dial the G2 (flyback) down the red ‘bleed through’ comes down. But the brightness of the othe colors come down too. So the ‘sweet spot’ of brightness and contrast dissapears and the picture becomes somewhat too dimm.
I wish the red would ‘stay in line’ with the green and blue.
Could this problem problably be with the transistors on the neckcard? Or should I be looking elsewhere?
Thank you for your help in advance
grantspain:
maybe a leaky diode d4 or leaky tr201
do you have contrast pot or switch array?
sollima:
--- Quote from: grantspain on August 02, 2019, 09:49:21 am ---maybe a leaky diode d4 or leaky tr201
do you have contrast pot or switch array?
--- End quote ---
Thank you for your reply. I will measure and probably replace the transistor and diode.
I think I have the switch array. (three ‘levers’ with three settings.)
grantspain:
those chassis with the contrast switches can cause your exact issue, use some switch cleaner and see if it helps
sollima:
--- Quote from: grantspain on August 02, 2019, 03:31:19 pm ---those chassis with the contrast switches can cause your exact issue, use some switch cleaner and see if it helps
--- End quote ---
Thank you again for the tip. I will try that too.