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'[EE]: Re: Classic Tektronix scope problem?'
2002\09\12@192820 by Scott Touchton

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On some of the older models, the cursors were controlled by pots.  You might
just need to clean them.

Loss of the display sounds like you might also be losing the high voltage
supply.  This is common, having mostly to do with a multiplier cap breaking
down as it gets warm.

The best first thing to do is to check the supply voltages.  Even if you do
not have a manual, Tek was usually very good at labeling the test points.
Be prudent around the HV, but like the rest of us you probably discovered
this successfully in your childhood.

<<<<<<<SNIPPPPPPPP>>>>>>>>>>>  ulitmate bandwidth reduction... I think I was
the guy with the one line response to a 150 line unsnipped email.  Sorry
folks.

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2002\09\16@094432 by Roman Black

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Scott Touchton wrote:

> Loss of the display sounds like you might also be losing the high voltage
> supply.  This is common, having mostly to do with a multiplier cap breaking
> down as it gets warm.


Losing HV with a CRT will give the symptom of the
picture (or trace) FADING out as there is significant
capacitance at the CRT anode and supply.

If the picture dies instantly it is more likely a
heat related failure in a vert or horiz deflection
transistor or their base drivers.

Some simple rules for finding heat related intermittants;
* heat blanket
* freezer spray
* flex and thump it!
* transistors tend to fail open circuit with heat faults
* DRY JOINTS! (use bright light and magnifier)
* inspect anywhere the board looks cooked or darkened
* lots of patience! ;o)
-Roman

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