|
Just a quickie;
Make sure you have good solid and clean connections from your probes to the vertical input BNC connectors.
If you haven't had it out of the case yet, you may want to clean the switches.
You may also want to turn it off and work the switches manually a little bit-may have oxidized.
Try to go back a little into the calibrator circuit and look at it on the scope.
If you have ALT or CHOP mode, put both probes on the cal. output and see what happens-if both channels either work or not, it may be in the calibrator circuit or the horizontal. Hopefully we can save you $ for now.
|