Mallinckrodt NELLCOR NPB-4000, Service Manual

Page: 45 / 219

Section 5: Troubleshooting
5-5
Table 5-3: Serviceable Hardware Error Codes
Hex
Code
Explanation Recommended Action
A Measured value of
isolated reference
supply on front end was
low
1. Check power supply.
2. Replace main PCB.
B On a NPB-4000 rev 4
PCB or earlier. The
measured value of
isolated reference
supply on front end was
high.
1. Check power supply.
2. Replace main PCB.
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.
1. Check power supply.
2. Replace main PCB.
64 MP-205 SpO
2
module is
not sending messages
to host CPU.
1. Ensure MP-205 module is
properly connected.
2. Replace MP-205 module.
3. If problem persists, replace
main PCB.
65,
66
MP-205 SpO
2
module
has detected an error
during initialization.
1. Replace MP-205 module.
2. If problem persists, replace
main PCB.
6E-
71
MP-205 SpO
2
module
has detected an error
on its serial port.
1. Replace MP-205 module.
2. If problem persists, replace
main PCB.
5.6.2.2 Other Error Codes
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.