Mallinckrodt NELLCOR NPB-4000 Service Manual page 45

5.6.2.2 Other Error Codes
Table 5-3: Serviceable Hardware Error Codes
Hex
Explanation
Code
A Measured value of
isolated reference
supply on front end was
low
B On a NPB-4000 rev 4
PCB or earlier. The
measured value of
isolated reference
supply on front end was
high.
C On a NPB-4000 rev 5 or
later, or on NPB-4000C.
The measured value of
isolated reference
supply on front end was
high.
64 MP-205 SpO
2
not sending messages
to host CPU.
65, MP-205 SpO
2
66 has detected an error
during initialization.
6E- MP-205 SpO
2
71 has detected an error
on its serial port.
If an error code occurs that is not listed in paragraph 5.6.2.1, take the following
actions:
1. Turn monitor off, then on again.
2. If error code still appears, take monitor out of service and contact
Mallinckrodt Technical Services or your local Mallinckrodt representative
for advice on remedial action.
3. If monitor powers up and error code does not recur, enter Diagnostic Mode
and invoke Error Code screen. Examine record of last 10 error codes and
determine if same error code had occurred previously.
Recommended Action
1. Check power supply.
2. Replace main PCB.
1. Check power supply.
2. Replace main PCB.
1. Check power supply.
2. Replace main PCB.
module is
1. Ensure MP-205 module is
properly connected.
2. Replace MP-205 module.
3. If problem persists, replace
main PCB.
module
1. Replace MP-205 module.
2. If problem persists, replace
main PCB.
module
1. Replace MP-205 module.
2. If problem persists, replace
main PCB.
Section 5: Troubleshooting
5-5