Buttons; Table 6: Button Problems - Nellcor OXIMAX N-595 Service Manual

Buttons

N-595
Condition
The N-595 does not
operate when
disconnected from AC
power.
Battery Low indicator
on during DC operation
and an alarm is
sounding.
Battery does not
charge.
Table 6 on page 45 lists symptoms of problems relating to non-responsive
buttons and recommended actions. If the action requires replacement of a
PCB, refer to Disassembly Guide on page 51.
Symptom
The N-595 turns on but
does not respond to
some or all of the
buttons.
Table 5: Power Problems
Recommended Action
The battery may be discharged. To recharge the battery,
refer to Battery Charge on page 10. The monitor may
be used with a less than fully charged battery but with a
corresponding decrease in operating time from that
charge. The battery may be defective.
There are 15 minutes or less of usable charge left on the
N-595 battery before the instrument shuts off. At this
point, if possible, cease use of the N-595 on battery
power, connect it to an AC source and allow it to
recharge (approximately 14 hours). The N-595 may
continue to be used while it is recharging. (A full
recharge of the battery while the monitor is being used
takes 18 hours.)
• Replace battery if it is more than 2 years old.
• If the battery fails to hold a charge, replace the
battery as indicated in Battery Replacement on
page 55.
• 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 power supply and connect a
DVM to them. The voltage measured should be 6.8
VDC ± 0.15 VDC and the current should be 400 mA
± 80 mA. Replace power supply if above values are
not met.

Table 6: Button Problems

Recommended Action
• Replace Display PCB assembly. See Display PCB
Removal/Replacement page 62.
• If the buttons still do not work, replace User
Interface PCB. See User Interface PCB Removal/
Replacement on page 64.
Troubleshooting
45