Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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whipaway
 
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Default Tektronix T-912 acting up: no trace

I was using my t-912 for about an hour, then I walked away and came
back, there was no trace anymore. The crt filament lights up fine, and
I can see the trace briefly appear then I turn off the power switch,
so for some reason it is being blanked, I guess. The beam finder does
not help finding the beam.
Not having a schematic I don't know what voltages to check for at the
various test points.
If anyone has any suggestions, or a schematic, please let me know.

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