Service Procedures
4–11
Relay switch fuse replacement
If overload from the “nurse call” system blows the relay switch fuse on the Trend
Download board, replace the fuse with a fuse of the same type and rating.
WARNING: Power OFF and disconnect the monitor from external power
before performing any procedure that involves disassembly of the monitor.
WARNING: Internal electronic components are susceptible to damage by
electrostatic discharge. To avoid damage when disassembling the monitor,
observe the standard precautions and procedures for handling static-
sensitive components.
Tools:
• Phillips screwdriver, #1
• Needle-nose pliers
1. Power OFF and disconnect the power cord and other cables from the monitor.
2. On the right (ComWheel) side of the monitor, loosen the 3 screws until you can lift
the bumper assembly away from the housing.
3. Note the orientation of the ComWheel encoder cable and the speaker cable. Each is
“keyed” for correct connection to the System board. Carefully disconnect both
cables from the System board and remove the bumper assembly.
4. On the left side of the monitor, remove the 3 screws and the left bumper assembly.
5. Push all the boards (as a unit) from the right side of the housing out the left side until
you can easily disconnect the line power cable and the battery cable from the
System board. Disconnect the cables.
6. Note which slots in the housing are used for the boards. Then, slide the boards all the
way out the left side of the housing.
NOTE: If you dislodge the Alarm Silence button, the power button, and/or the power
button pad, set the part(s) aside until you reinstall the boards.
7. Disconnect the ribbon cable from the Trend Download board.
8. Using a needle-nose pliers, replace the fuse at F2 on the Trend Download board.
9. Connect the ribbon cable to the Trend Download board.
10. Position all three boards in their slots in the left side of the housing. Slowly slide the
boards (as a unit) into the housing until you can easily connect the battery cable and
the line power cable to the System board. Connect the cables.
11. Slide the boards all the way into the housing. Reposition the Alarm Silence button,
the power button, and the power button pad, as needed.
12. Position the left bumper assembly over the left side of the housing, holding the inner
left end plate in place. Place the outer end plate over the left bumper and install the
3 screws that secure the bumper assembly to the housing.
13. At the right side of the housing, connect the speaker cable and the ComWheel
encoder cable to the System board. Position the cables inside the housing to ensure
they will not be pinched.
14. Place the right bumper assembly over the housing and tighten the 3 screws.
Important: Test the monitor. See Functional check earlier in this chapter.
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