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M3000A/M3046A/M3015A/M3016A Service Guide
Maintaining the Instrument 3-5
Preventive Maintenance Tasks
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Preventive maintenance for the Monitor comprises the following activities:
Perform visual inspection (seeInspecting the Instrument on page 4)
Replace the Backlight Tube Assembly (if required).
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The intensity of the fluorescent tube used for backlight illumination of the LCD Display
gradually decreases over time. As a result, periodic replacement is necessary.
Agilent Technologies recommends replacement of the Backlight Tube Assembly after 3
years (20 000 hours) of continuous use or if there is noticeable decrease in the display
illumination. (Display illumination decreases by about half after 3 years of continuous use.)
The procedure for replacing the Backlight Tube Assembly is found in "Repairing the
Instrument".
127( After fitting new tubes, go to Service Mode and reset the Backlight-Tube counter to
zero.
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The preventative maintenance for the Noninvasive blood pressure measurement consists of
the following tests:
Accuracy Test
Leakage Test
Linearity Test
Valve Test
The tests are described in Chapter 4 Testing the Instrument, see NBP Accuracy, Leakage,
Linearity and Valve Test on page -10.
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