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Old 17th Jul 2019, 2:48 pm   #1
dom10161
Triode
 
Join Date: Aug 2009
Location: Manchester, UK.
Posts: 12
Default Commodore 1084-D2 Monitor Repair

Hi

First repair post, Hope it's in the right section.

I have on the bench a Commodore 1084 Monitor which I am in the process of repairing for a friend. He said it was fine when put into storage a few years ago, But now dead. He replaced the main smoothing cap himself.

Fortunately the service manual is available online and working my way through the schematic, I have managed to bring the monitor back to life.
The 12v power rail was dead due to a short circuit Cap C605 220uf and a faulty 7812 Voltage Regulator I402.
However another fault has presented itself.

To test the monitor I am feeding it with a composite signal from a DVD player. The picture is OK for about 30 secs then black horizontal lines start appearing about every inch with odd bursts of colour.

I have attached an image showing the fault

Its been about 15 years since I worked on anything CRT related, any assistance would be much appreciated.

Thanks in advance
Dom
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