Dräger Narkomed 2B, Руководство по обслуживанию, Страница: 124 / 308

REPLACEMENT PROCEDURES (continued) NM2B
4.27 CRT Assemblies
Access to the two CRT assemblies in the monitor box requires removal of the
top shelf. Figure 4-27 shows the CRT mounting arrangement and connections.
The following procedure applies to both CRT assemblies.
4.27.1 Set the System Power switch to
STANDBY
and remove AC power
from the machine.
CAUTION: 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.
4.27.2 Disable the three circuit breakers at the back of the monitor box by
pulling out each button with a knife or sharp object.
4.27.3 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.
4.27.4 On the power supply assembly, disconnect the AC power cable at J1,
and disconnect the battery power cable at J7.
4.27.5 Disconnect the ribbon cable from H10 on the CRT assembly. (If the
CRT assembly next to the processor is being replaced, disconnect the
ribbon cables from J1, J4 and J7 on the processor board.)
4.27.6 Remove the four socket head mounting screws, and lift the CRT
assembly from the monitor box.
4.27.7 Position the replacement CRT assembly in the monitor box and
reinstall the four mounting screws. Before tightening the screws, slide
the CRT assembly as far forward as possible.
4.27.8 Connect the ribbon cable to H10 on the CRT assembly. (Reconnect the
cables to J1, J4 and J7 on the processor board if necessary.)
4.27.9 Connect the cables that were previously removed from J7 and J1 on
the power supply assembly.
4.27.10 Reset the circuit breakers at the back of the monitor box, and restore
power to the machine.
Rev. A
4-92
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