Nellcor Oximax NPB-40, Service Manual

Page: 45 / 114

Troubleshooting
NPB-40 37
Error Codes
An error code is shown when the NPB-40 detects a non - correctable failure.
Table 4 provides a list of error codes for the NPB-40. When one of the following
errors occurs:
• NPB-40 sounds a low priority alarm
• Measurements stop
• “Er” is shown in the %SpO
2
numeric display area
• Error code is shown in the right numeric display
• Cycling the power should clear the shown error code
Table 4 provides a list of error codes for the NPB-40.
• Flex circuit between the front panel and
the CPU PCB is disconnected.
Inspect the flex circuit and reconnect if the flex circuit is
loose. See Separating the Front and Back Cases on page 44.
• A CPU PCB Component has failed. Inspect the CPU PCB components and circuit board for
cracking, burning, or damage and replace the CPU PCB if
any are found. See CPU PCB or Display PCB Replacement
on page 46.
• CPU PC has failed. Replace the CPU PCB with a known good PCB. See CPU
PCB or Display PCB Replacement on page 46.
• The printer batteries are at or near a
voltage too low to operate the printer.
Install new batteries in the printer. See the printer
documentation.
• The Display PCB has failed. Replace the Display PCB with a known good PCB.See CPU
PCB or Display PCB Replacement on page 46.
• The CPU PCB has failed. Replace the CPU PCB with a known good PCB. See CPU
PCB or Display PCB Replacement on page 46.
• The printer is defective. Attempt to print using a known good NPB-40. If the printer
still does not print, troubleshoot the printer. See the printer
documentation.
Table 3:
Troubleshooting Guide
(Continued)
Condition Recommended Actione
Table 4: Error Codes
Error
Code
Scope of Action
Action Explanation
Clinician Re
pair
Re
tur
n
1 X Replace SpO
2
board. SpO
2
front end RAM error.
2 X Replace SpO
2
board. SpO
2
front end ROM/code integrity
error.
3 X Replace SpO
2
board. SpO
2
front end reported a bad CRC.
4 X Replace SpO
2
board. SpO
2
front end reported FSP message
not allowed.