Scope repairs

Grant Richter grichter at
Tue Nov 30 01:27:04 CET 1999

It's the power supply. Check all your CRT voltages
to make sure they are in the correct range.

> From: Tony Allgood <oakley at>
> To: synth diy <synth-diy at>
> Subject: OT: Scope repairs
> Date: Sunday, November 28, 1999 5:28 AM
> Hi all,
> One of the worst disasters to befall the diyer has just happened. My
> scope is dying and needs a quick kiss of life. The line/dot has become
> very hard to focus, either side of a very narrow margin the dot/line
> becomes an amorphous blob that threatens to take over the whole screen.
> The fault seemed to develop overnight. All other functions work OK,
> including X and Y positioning. I have the full schematics to the scope,
> a TEK 2225, but without a scope or a high voltage DVM, I am at a loss. I
> have been inside and the focus knob is working fine, and nothing else
> looks bad. Has anyone any ideas? Or failing that, any nice repair shops
> for dying CRTs in the UK.
> Thanks in advance,
> Regards,
> Tony Allgood  Penrith, Cumbria, UK
> Walsh synthesiser, SuperLadder, TB303 clone and rack mounted filter

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