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Has it worked recently?
First, remove both horizontal output and damper tubes, clean pins, and lightly coat with Deoxit, plug them back in and recheck.
If that does not help, unplug CRT socket and check all the voltages except
focus and convergence ... be VERY careful not to get anything close to those two places.
IF they are OK, if you have a good HV probe (good to 20 kV) check convergence and focus voltages. Convergence is derived from the main
19.5 kV HV supply so it checks that.
Beyond those checks it gets more equipment dependant.
I've had no raster twice: once was a filament pin that was not contacting, the other was a damper tube pin not contacting.
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