Nellcor Oximax NPB-40, Руководство по обслуживанию

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Troubleshooting
NPB-40 35
• 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.
One or more keys on the front panel keypad does not work.
• The front panel keypad is defective. Caution: Unlock J3 before attempting to
remove flex circuit conductor.
Open the NPB-40, disconnect the front case from J3 on the
CPU PCB and connect an ohmmeter lead to the flex circuit
conductor for J3, pin 3 and individually connect the other
ohmmeter lead to each conductor for the buttons. Refer to
the front panel schematic diagram (**). Observe a short
when the button is pressed and an open when the button is
not pressed.
If incorrect, replace the front case. See Front Case Assembly
Replacement on page 49.
If correct, replace the CPU PCB. See CPU PCB or Display
PCB Replacement on page 46.
• 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.
One or more display segments does not work.
• A display PCB component has failed. Inspect the Display PCB for cracking, burning, or damage
and replace the Display PCB if any damage is found. See
CPU PCB or Display PCB Replacement on page 46.
• The Display PCB is defective. Replace the Display PCB if any damage is found. See CPU
PCB or Display PCB Replacement on page 46.
The speaker does not sound for pulse rate or alarms.
• The speaker is turned off. Turn the NPB-40 off then on.
• The holes for the speaker on the back of
the NPB-40 are blocked.
Clear the holes for the speaker on the back of the NPB-40.
• The external output port on 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 speaker on the Display PCB has
failed.
Replace the Display PCB with a known good PCB. See
CPU PCB or Display PCB Replacement on page 46.
Pulse rate and %SpO
2
value is not shown and the NPB-40 is turned on.
• The SpO
2
sensor is not connected
properly.
Connect the SpO
2
sensor to the NPB-40.
Connect the SpO
2
sensor to the patient. See the sensor
Directions for Use.
• The SpO
2
sensor has failed. Replace the SpO
2
sensor with a known good sensor.
• The Display PCB is defective. Replace the Display PCB with a known good PCB. See
CPU PCB or Display PCB Replacement on page 46.
Table 3:
Troubleshooting Guide
(Continued)
Condition Recommended Actione