User`s guide
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 (see“Inspecting 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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