Mallinckrodt Nellcor N-20PA Service Manual page 36

Troubleshooting
Category 6 — Clock Errors
Category 7 — Watchdog-Timer Errors
Category 8 — Printer Errors
4-10
Failure of the real-time clock (auxiliary PCB), or timing differences between the
CPU clock and the real-time clock. Likely action is replacement of the main or
auxiliary PCB.
601 Failure of real-time clock
602, 603 Errors in real-time clock
Error in the watchdog-timer circuit of the CPU (main PCB). Likely action is
replacement of the CPU.
701, 702 Errors in watchdog-timer
Error in the printer. If a printer error condition occurs, the display reads Pr Err.
See the Troubleshooting section for further information on this error.