Power Supply - Dräger Narkomed 2B Service Manual

REPLACEMENT PROCEDURES (continued)
4.25

Power Supply

The power supply assembly is located within the monitor box. Access to the
power supply requires removal of the monitor box top shelf. Figure 4-25 shows
the power supply assembly mounting arrangement and connections.
4.25.1 Set the System Power switch to STANDBY and remove AC power
from the machine.
CAUTION:
4.25.2 Disable the three circuit breakers at the back of the monitor box by
pulling out each button with a knife or sharp object.
4.25.3 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.
4.25.4 On the power supply assembly, disconnect the AC power cable at J1,
and disconnect the battery power cable at J7.
4.25.5 Disconnect the data cable at J9, and disconnect the output cable at
J10.
4.25.6 Disconnect the Brown and Blue receptacle wires connected to the top
of Circuit Breaker #3.
4.25.7 Loosen the four captive mounting screws on the baseplate of the
power supply assembly.
4.25.8 Lift the front of the power supply first, and then lift the assembly out
of the monitor box.
4.25.9 Position the replacement assembly in the monitor box and tighten the
captive mounting screws.
4.25.10 Connect the following cables:
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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.
Output Cable to J10
Data Cable to J9
Battery Cable to J7
AC Power Cable to J1
Brown and Blue receptacle wires to CB3
4-86
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NM2B
Rev. L