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Maintenance
4-15
3. Re-install the screws that secure the drawer to the monitor.
NVRAM Replacement
1. Follow the previous PCBA drawer removal instructions.
2. Use an IC extractor tool to remove the NVRAM located at U940 on the CPU PCBA.
3. Insert a new NVRAM into location U940 on the CPU PCBA, being careful to correctly orient
the device.
4. If the NVRAM was secured with a tie-wrap, install a new tie-wrap (P/N 344-05018-00). If the
NVRAM was secured with double adhesive tape, replace the tape (P/N 253-0052-00).
5. Reinstall the PCBA drawer assembly by following the PCBA drawer insertion procedures.
CPU PCBA Replacement
1. Follow the PCBA drawer removal and disassembly instructions above.
2. Replace the CPU PCBA.
3. Mate the interconnect PCBA to the CPU PCBA, then mate the I/O PCBA to the interconnect
PCBA.
4. Replace the screw located in the center of the PCBA that secures the CPU and I/O PCBAs
to each other.
5. Reattach the rear panel and replace all the screw locks that secure the rear panel
connectors.
6. Reinstall the I/O and CPU drawer assembly into the monitor.
7. If NVRAM is suspected as the failure, order the CPU PCBA pre-configured or contact a
Spacelabs Medical field service engineer to configure your options (SYSGEN). Privileged
access and user configuration information can be updated by the technician from the on-site
network logs.
CAUTION:
• Replacement of ALL screws, hex nuts, and fasteners is required to maintain
Electrical Magnetic Interference (EMI) Emissions within acceptable limits.
Any removal or non-replacement of hardware can cause increased emission
levels and susceptibility to external noise sources.
!
• The NVRAM contains a battery with a lifetime of 10 to 20 years. In normal usage,
with the monitor on and in use, the NVRAM should be replaced every 10 years.
!
• The NVRAM (U940) on the CPU PCBA contains all configuration information for
the monitor. To avoid having to reconfigure the new CPU PCBA, install the
NVRAM from the defective CPU PCBA onto the new CPU PCBA in place of the
new blank NVRAM. The blank NVRAM should be installed back into the defective
CPU PCBA.