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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

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Old 14th Jul 2018, 12:16 pm   #1
Oldgeorge
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Location: Seaham, County Durham, UK.
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Default Display shimmering at edges ( PM3375 Philips )

I am having an issue with my PM3375 scope.
The problem is that the trace in the centre section of the CRT is fine but towards the outside edges it sort of shimmies very quickly from side to side.
Its the same in all modes including digital freeze mode.
The menu text in digital mode is ok in the centre but " raggy" at the ends.
All controls work normally.
The effect is on all timebase speeds.
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Last edited by Oldgeorge; 14th Jul 2018 at 12:22 pm.
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Old 14th Jul 2018, 12:45 pm   #2
MrBungle
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Default Re: Display shimmering at edges ( PM3375 Philips )

This might be early signs of power supply problems. It’s about the right age to need a refurb. I’d check the power supply rails for noise.
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Old 14th Jul 2018, 7:09 pm   #3
Oldgeorge
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Default Re: Display shimmering at edges ( PM3375 Philips )

Yes thats what I was thinking, need to get hold of a diagram, but hen's teeth would be easier to acquire

I do have other scopes so checking won't be a problem.
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Old 15th Jul 2018, 12:57 am   #4
karesz*
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Default Re: Display shimmering at edges ( PM3375 Philips )

Hello,
you can download it_after some waiting...
rgds, Karl
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