I my haste, I admit, I didn't note down the scope model number. I thought it was a HM203-7 from pictures I searched for, but then realised it was a HM203-6 - DOH!
I noticed after some of the connector numbers did not match those on the schematics!
With the correct schematics in hand, I set about looking at a few high voltage lines - why the high voltage lines? Well I was getting no display yet I was getting the trigger LED to light when I put in the test signal on channel 1, which lead me to suspect the tube was not displaying the signal yet the triggering system was seeing the signal.
I LIKE TO MAKE CLEAR, THERE ARES SOME PRETTY NASTY VOLTAGES THAT WILL BELT YOU IF YOU ARE NOT CAREFUL OR ARE INEXPERIENCED - TAKE CARE OR DO NOT UNDERTAKE IF YOU DON'T FEEL CONFIDENT!
Here are links to relevant things:
Hameg HM203-7 service manual
Hameg HM203-6 service manual
EEVblog forum post
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