Dräger Narkomed 2B Service Manual page 115

NM2B
4.24 Battery
The AC backup battery is located on the power supply assembly in the monitor
box and can be replaced without removing the power supply. Access to the
battery requires removal of the monitor box top shelf, and removal of the
power supply cover plate. Figure 4-24 shows the battery mounting
arrangement and connections.
4.24.1
CAUTION:
4.24.2
4.24.3
4.24.4
4.24.5
4.24.6
4.24.7
4.24.8
4.24.9
Rev. A
RETURN TO THIS MANUAL'S TABLE OF CONTENTS
REPLACEMENT PROCEDURES (continued)
Set the System Power switch to STANDBY and remove AC power
from the machine.
Use ESD protection when servicing any of the assemblies inside
the monitor box. It is also recommended that the AC line cord be
plugged into a test fixture which maintains the electrical service
ground connection to the machine while isolating the line and
neutral conductors.
Disable the three circuit breakers at the back of the monitor box by
pulling out each button with a knife or sharp object.
Remove the screws holding the monitor box top shelf. Lift the back
of the shelf and disconnect its ground wire from the chassis ground
tab, then lift out the shelf.
On the power supply assembly, disconnect the AC power cable at J1,
and disconnect the battery power cable at J7.
Remove the four cover plate retainer screws, and remove the power
supply cover plate.
Loosen the four battery retainer captive mounting screws, and
remove the battery retainer.
Lift out the battery and disconnect the two wiring harness connectors
from the battery.
If the replacement battery is not supplied with a wiring harness
attached, transfer the existing harness to the replacement battery.
Connect the yellow wire to the (+) battery tab, and the black wire to
the (-) battery tab. Wrap the battery in a plastic bag in the same
manner as the original battery.
Position the replacement battery in the power supply chassis.
4-83
RETURN TO CD-ROM TABLE OF CONTENTS