EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: seba78 on December 27, 2020, 03:23:06 pm
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Hello,
I'm trying back to life old Tektronix 465 scope.
PSU: All rails in spec
Problem: horizontal flat line that cannot be moved up-down (only left right).
Triggering: working, after applying calibration signal it grab trigger lamp.
Time base working (on slow i can see trace sweeping)
applying signal to A & B channel have no affect even, switching settings on A & B vertical have no affect on line (not even simplest smallest jump).
I visually inspected Vertical Output Board (don't see anything obvious) .
Actual problem looks like output of method described in general tektronix service manual (please take look at attachment)
Could You give me any hint where to start in nailing it down?