Keypads - Dräger Narkomed 2B Service Manual

REPLACEMENT PROCEDURES (continued)
4.28

Keypads

The alarm keypad and the CRT keypad are part of the front bezel assembly.
Access to the keypads requires removal of the monitor box top shelf and
removal of the CRT assemblies, processor, and filter panel retainer brackets.
Figure 4-28 shows the keypad and filter panel mounting arrangement.
4.28.1 Set the System Power switch to STANDBY and remove AC power
from the machine.
CAUTION:
4.28.2 Disable the three circuit breakers at the back of the monitor box by
pulling out each button with a knife or sharp object.
4.28.3 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.
4.28.4 On the power supply assembly, disconnect the AC power cable at J1,
and disconnect the battery power cable at J7.
4.28.5 Disconnect the following cables from the processor assembly:
4.28.6 Carefully disconnect the tubing at the right-angle fitting on the
baromed sensor line. Be careful not to bend or crimp the hose barb.
4.28.7 Loosen the four captive mounting screws on the baseplate of the
processor assembly.
4.28.8 Lift the front of the processor assembly first, and then lift the
assembly out of the monitor box.
4.28.9 On each CRT assembly, remove the four socket head mounting screws
and lift the assembly from the monitor box.
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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.
J5 Power J4 CRT
J6 Data J1 Keypad
J7 Alarm J2 Keypad
J8 Alarm J9 Spiromed Sensor
J3 CRT J10 O
4-96
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Sensor
2
NM2B
Rev. A