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Tektronix TDS520 Oscilloscope

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Andrew Tweddle

Jan 1, 1970
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I am helping a friend repair a Tek TDS520 Oscilloscope.

The fault on the power-up Diagnostic log looks like this.

Pass - Processor
Pass - Cal/Initialization (see error log)
Fail - Acq/Proc. Interface
Fail - Acquisition
Pass - Attn/Acq Interface
Pass - FP/Proc Interface
Pass - Front Panel

I next hit a key and the machine starts working.
I ran a 300 Meg signal into it and the displayed waveform with the
oversampling switched on looked half like a sinewave except it was
shaded to the top of the screen. (sorry for the poor explanation)

Any ideas greatfully received !

regards

Andrew
 
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