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The CPU Assembly
Removing
the CPU
Assembly
Caution
Q
Warning
6
This section describes how to remove and replace the CPU assembly.
This procedure applies to all units.
To remove the CPU assembly:
Use an electrostatic wrist band or other approved method for
protection against electrostatic discharge when disconnecting cables
from and handling the CPU assembly.
Perform the following
four steps sequentially
to eliminate the chance of
exposure
to hazardous
voltages.
1. Disconnect the AC power cord.
2. Verify that no disk is in the disk drive.
3. Turn the cardiograph On. (This allows the rectifier assembly
capacitors to discharge more rapidly.)
4. Remove the battery as described earlier in this chapter.
5. Remove the top cover assembly as described previously in this
chapter.
6. Disconnect the two rectifier cable spade lugs (J6 and 57) and the
two disk drive cables (514 and 515). (See Figure 7-20 for jumper
locations.)
7. If the unit has a preview assembly, remove the preview logic
board assembly as described previously in this chapter.
S. Remove the board mounting screws (shown in Figure 7-20). Also
remove the jackposts that hold the serial and patient module
connectors to the rear panel.
9. Lift off the RF1 shield, then slide the board toward the front of
the cardiograph and disconnect the spade lug at J8.
10. Lift the board out of the lower chassis.
Removal and Replacement
7-29
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