Author Topic: Telequipment S54A no trace, sawed off ground  (Read 291 times)

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Offline Hengy

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Telequipment S54A no trace, sawed off ground
« on: August 22, 2018, 10:12:01 am »
I recently got a well-used (looking) Telequipment S54A scope from auction. First thing I noticed was that the ground pin on the power plug was sawed/hacked off. I tried plugging it in anyways, just to see if it worked, and I didn't get a trace. I followed the instructions for first-time operation, so I think all the knobs were in the correct position, and I was using the front panel 50mVp/p Cal output. The screen illumination works, and it draws about 7W at the plug. If I turn the brilliance up (clockwise) all the way, it suddenly draws 22W, and I can see the screen illumination (or maybe the CRT itself) flicker slightly.

I haven't opened it up yet. Could the lack of ground be the problem? Given a working screen, do I need to reattach the ground pin? I assume the AC coupling mode might not work, and obviously the ground plug on the front would be useless...

Thanks, Hengy
 

Online xrunner

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Re: Telequipment S54A no trace, sawed off ground
« Reply #1 on: August 22, 2018, 10:18:16 am »


I haven't opened it up yet. Could the lack of ground be the problem?

It's a bad thing but shouldn't prevent the scope from displaying a trace.

Quote

Given a working screen, do I need to reattach the ground pin?

Yes! Get a replacement plug and fix the line cord.

I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 


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