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Old 19th Oct 2020, 6:37 pm   #1
antpant7
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Default Microvitec CUB 1431ms

Hello, I have recently purchased a Microvitec CUB 1431.
So far I have replaced :
  1. Trippler
  2. LOPT
  3. Various fusible resistors
The unit powers up fine however I am getting a red background. I have tired the lowering the Red Gain however it makes no difference. I also tried disconnecting the Red Channel from the main PCB to the PCB mounted on the back of the tube, again no difference . I think it may be a problem with the PCB on the Tube.

I have attached a picture, any ideas ?
Many thanks.

Antony Myers.
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Old 21st Oct 2020, 4:38 am   #2
Kyle__B
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Default Re: Microvitec CUB 1431ms

Also looks like you have retrace lines?

Maybe this would get more attention in the telly section being a CRT problem.
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Old 21st Oct 2020, 10:18 am   #3
Station X
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Default Re: Microvitec CUB 1431ms

Thread moved.
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Old 21st Oct 2020, 10:32 am   #4
cmjones01
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Default Re: Microvitec CUB 1431ms

That to me looks like the red gun is turned hard on all the time, hence the retrace lines. The fault is very likely to be on the tube base PCB. Looking at a circuit diagram here, I'd start checking TR901 and TR902, R907 and the other components in the red channel.

Chris
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Old 21st Oct 2020, 11:20 pm   #5
McMurdo
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Default Re: Microvitec CUB 1431ms

have you reset the A1 volts?
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