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3. TROUBLESHOOTING
3.1 Troubleshooting guide
Situation
Dashes are displayed
for measurement.
Flashes ON/OFF.
Start-up tones did not
sound.
Power supply cable
disconnects easily
from the power jack.
This chapter contains:
• A guide for troubleshooting problem situations.
• Board drawings, test points, and connector pin assignments.
The following chart lists situations that may occur while using the monitor. Follow the
recommended action in the order listed until the cause is isolated and corrected.
NOTE: Procedures for replacing monitor parts are in the Service Procedures chapter.
Cause
Poor signal quality caused by a
disconnected or improperly
applied sensor, low perfusion, or
interfering substances (such as
excessive ambient light, nail polish,
or an electrosurgical device).
Overlapping cables or a device
connected to the RS-232 port can
also cause interference.
Signal interference due to an
incorrect line power frequency
setting.
Signal interference due to poor
grounding at AC power source.
Signal interference due to
adjacent sensors (two or more
SpO
sensors on the same hand
2
or foot, for example).
Low battery. Monitor can be
powered by battery only 10 to 60
minutes longer.
NOTE: Press the Alarm Silence
button once to cancel the alarm.
Speaker is disconnected or faulty.
Alarm system failure.
If the pin inside the power jack is
slotted, the sides of the pin may
be pressed together.
Damaged or worn power jack.
Action
Check the sensor connection and placement.
Change the site or use a different style of sensor in
the presence of continuous, severe motion.
Remove sources of interference.
Make sure cables do not overlap. Disconnect the
cable from RS-232 port.
Disconnect the power cable from the monitor and
use battery power.
Set the line power frequency to match your local
AC power source (50 Hz or 60 Hz). See Functional
check in the Service Procedures chapter.
Use a grounded AC power source or use battery
power.
Apply only one sensor to the hand, foot, or any
other site.
Connect the monitor to external power as soon as
possible to recharge the battery.
NOTE: When the battery is completely depleted, all
display and measurement functions are switched
OFF and a continuous tone sounds.
Connect the speaker cable to the System board.
Power ON. If the tones do not sound, replace the
speaker.
Replace the System board.
To expand the slot, slowly insert a very small flat-
blade screwdriver into the slot and gently move it
from side to side.
Replace the power jack assembly.
3–1
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