NEC POWERMATE PROFESSIONAL 9000E - SERVICE, Service Manual

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7-2 Preventive Maintenance
This section contains general information for cleaning and checking the system,
keyboard, and monitor.
The system unit, keyboard, and monitor require cleaning and checking at least
once a year, and more often if operating in a dusty environment. No other
scheduled maintenance is required.
!
WARNING
Unplug all power cords before performing any maintenance.
Voltage is present inside the system and monitor even after
the power is off. All voltage is removed only when the power
cord is unplugged.
System Cleaning
Use the following procedure for cleaning the system.
1.
Power off the system and unplug all power cables.
2.
Wipe the outside of the system, keyboard, mouse, and monitor with a soft,
clean cloth. Remove stains with a mild detergent. Do not use solvents or
strong, abrasive cleaners on any part of the system.
3.
Clean the monitor screen with a commercial monitor screen cleaning kit. As
an alternative, use a glass cleaner, then wipe with a clean lint-free cloth.
4.
Local distributors and dealers may sell diskette drive head cleaning kits.
These kits contain special diskettes and cleaning solution. Do not use the
abrasive head cleaning kits (kits without cleaning solution).
Insert the diskette immediately after powering on the system, before disk
bootup. Allow the diskette drive heads to clean for about 30 seconds.
Keyboard Cleaning
As necessary, inspect and clean the inside of the keyboard as follows.
1.
Remove the twelve screws holding the keyboard enclosure together (see the
following figure).
!
CAUTION
The keyboard and cable together are considered a whole-
unit, field-replaceable assembly. Therefore, disassembly of
the keyboard is necessary only when cleaning the inside.