Performing Preventive Maintenance; Examining The Housing; Examining The Plug; Inspecting The Cord - HP M2350A Service Manual

Performing Product Assurance
Performing Preventive Maintenance
Examining the Housing
Examine the exterior of the unit for cleanliness and general physical condition. Ensure that
plastic housings are intact, that all hardware is present and tight, and that there are no spilled
liquids or other serious abuse.
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Examining the Plug
Examine the line/power plug for damage. Ensure that the prongs of the plug do not move in
the casing. Shake the plug and listen for loose screws. If any damage is suspected, open the
plug and inspect it.
Inspecting the Cord
Inspect the line/power cord for signs of damage. If damaged, replace the entire cord or, if the
damage is near one end, cut out the defective portion. Ensure that any new lime/power cord or
plug is fitted with the same polarity as the old one.
Inspecting the System Cables
Inspect the cables for general condition and examine them carefully to detect breaks in the
insulation. Ensure that the cable connectors are properly engaged and that any connector
screws are fully tightened.
Examining the System Controls
Examine all controls (hard keys, soft keys, arrow keys, ON/OFF switch, contrast and brightness
controls for physical condition. During the course of this examination, ensure that the controls
perform their proper function
Verifying CRT Integrity
Note
I
IF
Note the positions of all of the shift, contrast and brightness controls before
starting tests so that they are returned to their previous positions (assuming
they are correct) at the end of the testing procedure.
If possible, verify the integrity of the Display CRT by observing a signal from an ECG simulator
on the screen. The following should be observed:
a. The baseline should stay in focus across the CRT.
b. The baseline should be horizontal. It should not be noticeably sloped or bowed.
c. The EGG complexes from a fixed rate simulator should be regularly spaced. Uneven spacing
indicates a sweep non-linearity.
d. All portions of a simulated ECG waveform should be clear and visible, including the P wave
and QRS.
e. Using the V SHIFT control on the bottom rear (M1092AM1094A) or bottom right (M1094B)
of the Display, vary the vertical position of the baseline. It should be possible to move the
baseline through all of the vertical height of the CRT. There should be no distortion on
the
baseline as it is moved up or down on the screen.
f. Adjust the contrast and brightness controls so that they are at the maximum settings and
then adjust them so that they are at the minimum setting. The phosphor may "bum": check
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