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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 12th Feb 2024, 5:33 pm   #1
HamishBoxer
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Default Ekco TC267/1 No Raster

This is a real pain and rarely I get stuck, totally blank screen EHT normal. Problem is, I cannot get cabinet and chassis on the bench.

A while ago, some kind person put out a list of faults for this chassis, where now I do not know.

Yes it gives the centre spot when turned off and that is it.

Any thoughts? Ion trap is well locked I add.

Thank you.
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Old 12th Feb 2024, 9:24 pm   #2
FERNSEH
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Default Re: Ekco TC267/1 No Raster

Ekco TC267/1. That's the later version which employs 0.3amp valves.
Is the CRT grid voltage higher than the cathode voltage? The Mazda CRM172 grid to cathode voltage is -30V to -70V for cut-off.
First anode voltage should be 300V relative to the cathode.
Try shorting the CRT grid and cathode together.

DFWB.

Last edited by FERNSEH; 12th Feb 2024 at 9:31 pm.
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Old 12th Feb 2024, 9:34 pm   #3
Freya
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Default Re: Ekco TC267/1 No Raster

I have the genuine ekco sheets for this including the addendum pages. PM me if you need them.
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Old 13th Feb 2024, 11:00 am   #4
HamishBoxer
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Default Re: Ekco TC267/1 No Raster

Thank you David and Freya, I do have the RTV circuit but nothing extra. Will have another look at it.
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