6 Removal and Replacement
6.15 CMOS Backup Assembly Replacement
R688 HPM High-Performance Process Manager Service 431
December 2020 Honeywell
6.15 CMOS Backup Assembly Replacement
Introduction
Replacement of the CMOS Backup Assembly requires the removal of the redundant (right side) Power
Supply Module. See subsection “Power Supply Module Replacement” (“Removal and Replacement”
section) for removal of the Power Supply Module.
Figure 33 and Figure 34 are illustrations of the CMOS Battery Backup assembly, and Figure 31 and
Figure 32 illustrate the layout of the Standard Power System backpanel with the location of the CMOS
Battery Backup assembly connector.
Replacement procedure
Use the procedure in the following table to replace the CMOS Backup assembly.
Remove the screw located at the front middle of the CMOS Backup Assembly.
Extract the circuit board from the Power System backpanel assembly.
Insert the replacement circuit board in the connector on the Power System backpanel
assembly and fasten the screw.
SHOCK HAZARD
Troubleshooting, opening this equipment and removing any panels or covers will expose the
user to the risk of a shock hazard. There are no user serviceable parts inside this equipment.
Refer all servicing only to qualified service personnel.
Cabinet side panels (Markhon)
To remove the cabinet side panels, either for cabinet complexing or for service requirements, remove the
two external Phillips screws, lift up on the side panel approximately 1 to 2 inches, and pull the panel
outwardly. If the panel does not release, additional lifting of the panel may be required.
Cabinet side panels (Rittal)
To remove the cabinet side panels, either for cabinet complexing or for service requirements, remove the
six internal Phillips screws, lift up on the side panel approximately 1 to 2 inches, and pull the panel
outwardly. If the panel does not release, additional lifting of the panel may be required.
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