Nellcor NPB-40 Service Manual page 19

Table 4-1: Troubleshooting Guide (Continued)
Symptom
Printer will not The printer is turned
print. off.
The Store Data key
on the front panel
keypad is defective.
The printer batteries
are at or near a
voltage too low for it
to operate.
The NPB-40 and
printer are not
properly aligned.
A component on the
LCD PCB has failed.
A component on the
CPU PCB has failed.
The printer is
defective.
Error Code
100EEE Failure in the
microprocessor
analog-to-digital
converter on the CPU
PCB.
150EEE Failure of the
microprocessor on
the CPU PCB.
151EEE Failure of the RAM
on the CPU PCB.
152EEE Failure of the ROM
on the CPU PCB.
153EEE Failure in the
microprocessor I/O
ports on the CPU
PCB.
154EEE Failure of the
watchdog circuit on
the CPU PCB.
155EEE Failure of the
memory on the CPU
PCB when storing an
event or when
printing.
Probable Cause
Turn on the printer.
See One or more keys on the
front panel keypad does not
work, above.
Install new batteries in the
printer.
Refer to the operator's manual
for instructions for aligning the
NPB-40 with the printer.
Replace the LCD PCB with a
known good PCB.
Replace the CPU PCB with a
known good PCB.
Attempt to print using another
known good NPB-40. If the
printer still does not print,
troubleshoot the printer
Table 4-2: NPB-40 Error Codes
Failure Indicated
1. Replace the sensor.
2. Replace the CPU PCB with a
Replace the CPU PCB with a
known good PCB.
Replace the CPU PCB with a
known good PCB.
Replace the CPU PCB with a
known good PCB.
Replace the CPU PCB with a
known good PCB.
Replace the CPU PCB with a
known good PCB.
Replace the CPU PCB with a
known good PCB.
Section 4: Troubleshooting
Corrective Action
Corrective Action
known good PCB.
4-5