Power; Table 5: Power Problems - Nellcor OXIMAX N-595 Service Manual

Troubleshooting

Power

44
Table 4: Problem Categories
Problem Area
3. Display/Alarms
• Display does not respond properly
• Alarms and other tones do not sound
properly or are generated without apparent
cause
4. Operational Performance
• Displays appear to be operational, but
monitor shows no readings
• Suspect readings
5. Data Port
• N-595 data port not functioning properly
All of the problem areas in Table 4 on page 43 are discussed in the following
paragraphs.
Power problems are related to AC and/or DC. Table 5 on page 44 lists
recommended actions to power problems.
Condition
Battery Low indicator
lights steadily while
N-595 is connected to
AC and battery is not
discharged.

Table 5: Power Problems

Recommended Action
• Ensure that the N-595 is plugged into an operational
AC outlet and the AC indicator is on.
• Check the fuses. The fuses are located in the Power
Entry Module as indicated in Fuse Replacement on
page 52. Replace if necessary.
• Open the monitor as described in monitor
Disassembly on page 53. Verify the power supply's
output to the battery while on AC. Disconnect the
battery leads from the battery and connect a DVM to
them. The voltage measured should be 6.65 to 6.95
VDC and the current should be 320 to 480 mA.
Replace power supply if above values are not met.
• Check the harness connection from the bottom
enclosure to the User Interface PCB, as instructed in
User Interface PCB Removal/Replacement on
page 64. If the connection is good, replace the User
Interface PCB.
Refer To
Display/Alarms on page 46
Operating Performance on
page 47
Data Port on page 48