Nellcor OxiMax N-550, Service Manual

Page: 59 / 138

Troubleshooting
N-550 49
Data Port
Table 10 lists a symptom for data port problems and recommended actions. If
the action requires replacement of the User Interface PCB, refer to
Disassembly Guide on page 55.
Error Codes
When the N - 550 detects a defective sensor connected to the N-550, the N-550
displays an error code of “SEN Err.” The sensor should be replaced and the
N-550 power should be cycled.
An error code is displayed when the N-550 detects a non-correctable failure.
Cycling the power clears these errors. Table 11 lists the N-550 error codes and
their meanings. When one of these errors occur, the N-550:
• sounds a low priority alarm that cannot be silenced except by
power-down
• stops measurements
Table 10: Data Port Problems
Symptom Recommended Action
No printout is being
received. The N-550 is running on battery power. Connect the
N-550 to AC power.
The N-550's baud rate does not match the printer.
Change the baud rate of the N-550 following
instructions in the Operator’s manual.
Check the connection between the data port and the
printer. Refer to
Connecting To The Data Port on
page 91.
Replace the Front Panel PCB. Refer to Front Case
Disassembly on page 58.