aaron at aaronsplace.co.uk
Sat Apr 29 10:44:53 CDT 2017
Unfortunately I do not have an oscilloscope anymore. I've been trying to
find a cheap one on eBay for a few months but the prices seem very high
these days. I might be able to borrow one. For now I just have a true
I've tried both extremes of the contrast and brightness but the screen
is completely off. This is the amber version of the 220 if that makes
any difference. I can't hear any high pitched whining from the flyback,
which I can hear from my 420. All the large caps seem to be giving a
very close reading considering I haven't taken them off the board.
This terminal was working fine until about two months ago. It was in a
air conditioned server room and probably hadn't been powered off for 5
years or so until we had a long power cut, after which it didn't
work. Does this provide any insight?
Tony Duell writes:
> On Sat, Apr 29, 2017 at 4:19 PM, Aaron Jackson <aaron at aaronsplace.co.uk> wrote:
>> Seems to be working fine as a terminal hooked up to the TV which is good
>> news. I am sure you are correct about me having made a measurement error
> So the logic side is working. The problem is very likely to be in the
> monitor circuit,
> page 16 of the schematics.
> What test gear do you have? Do you have a 'scope, for example?
> Can you get anying on the screen if you adjust the brightness preset?
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