HP M2350A Service Manual page 257

Performing Product Assurance
Performing Preventive Maintenance
the condition of the phosphor on the CRT by noting if any "bum" spots (discoloration) are
visible.
g. Check to see if any noise (interference) is superimposed on the baseline with the EGG
simulator attached. Baseline interference may be apparent as a thick baseline at high gain
settings (using V AMP, H AMP, and EAST WEST controls on bottom rear of M1092A/M1094A
Display or bottom right side of M1094B Display), but should not be visible throughout the
lower two-thirds of the gain control range.
h. Apply an external 1 mV pulse. The trace should exhibit a leading edge with minimal
rounding and a spike (or overshoot) of less than 10%. After 1 second, the pulse should have
decayed no more than half of its original amplitude.
Note
d
Return the shift, contrast and brightness controls to their previous positions
(assuming they are correct) on completion of the listed tests.
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