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Replacing the
Internal
Temperature
Sensor Boards
Remove three screws
and clips per sensor
PC board. Note
orientation of clips.
Figure 5-3. Removing / Replacing the Enhanced Monitor PC Boards
Chapter 5
1. Turn off the mainframe and remove the power cord.
2. Remove the rear panel. Refer to "Removing the Rear Panel from the
Mainframe" on page 207 for instructions.
3. Remove the mainframe cover by removing the ten m3x6 flat head
torx screws (five on each side of the mainframe). Refer to "Removing
the Mainframe Cover" on page 208.
4. Refer to Figure 5-3. To replace the temperature sensor boards (all
three should be replaced together), remove the old boards.Carefully
break-apart the new sensor PC boards. Look carefully at the three
new PC boards; each one is labeled as either FRONT, MIDDLE, or
REAR. Make certain you place the sensor boards in the correct
positions.
5. Refer to Figure 5-3. To replace the Enhanced Monitor display board,
remove the screws holding the PC board and the nuts holding the
Diagnostic Connector to the front panel. Remove all ribbon cable.
6. Replace the mainframe cover and rear panel.
Note
You must recalibrate the Enhanced Monitor after replacing the
temperature sensor boards. Refer to Chapter 4, "Temperature
Monitor Calibration & Verification" on page 191 for details.
PC boards are
labeled FRONT,
MIDDLE, and
REAR.
Servicing Your Mainframe 209
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