Welch Allyn Spot Vital Signs 4400, Service Manual

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Symptom Possible cause Suggested action
General
The device does not power up. A new battery was installed. Connect AC power to wake
up the battery.
The battery is discharged. Connect AC power to charge
the battery.
The power switch is defective. Replace the power switch.
The power supply is defective. Check the output voltage on
the power supply. The voltage
should be 15 V ± 0.45V DC. If it
is not, replace the power
supply.
The battery is dead or defective. Charge the battery for 5 hours.
If the battery icon on the
display still shows an empty
battery symbol, replace the
battery.
The main board is defective. Replace the main board.
The touchscreen is
unresponsive.
Touchscreen needs calibration. Calibrate the touchscreen.
Run the Host Calibration
Sequence from the Service
Tool.
Replace the LCD /
touchscreen.
Replace the main board.
The device is powered on but
the display is blank.
The device is in Sleep mode. Touch the screen.
A hardware component has failed. Run the Host Calibration
Sequence from the Service
Tool.
Replace the LCD /
touchscreen.
Replace the main board.
NIBP
Blood pressure readings are
inaccurate.
Incorrect cuff size, improperly placed cuff, or
incompatible cuff.
Determine correct cuff size by
measuring patient's arm
circumference midway
between the elbow and the
shoulder. Then use a properly
sized cuff.
Use reference markings on the
cuff to place it properly.
98 Appendix