Welch Allyn Spot Vital Signs 4400 Service Manual page 102

98 Appendix
Symptom
General
The device does not power up. A new battery was installed.
The touchscreen is
unresponsive.
The device is powered on but
the display is blank.
NIBP
Blood pressure readings are
inaccurate.
Possible cause
The battery is discharged.
The power switch is defective.
The power supply is defective.
The battery is dead or defective.
The main board is defective.
Touchscreen needs calibration.
The device is in Sleep mode.
A hardware component has failed.
Incorrect cuff size, improperly placed cuff, or
incompatible cuff.
Suggested action
Connect AC power to wake
up the battery.
Connect AC power to charge
the battery.
Replace the power switch.
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.
Charge the battery for 5 hours.
If the battery icon on the
display still shows an empty
battery symbol, replace the
battery.
Replace the main board.
Calibrate the touchscreen.
Run the Host Calibration
Sequence from the Service
Tool.
Replace the LCD /
touchscreen.
Replace the main board.
Touch the screen.
Run the Host Calibration
Sequence from the Service
Tool.
Replace the LCD /
touchscreen.
Replace the main board.
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.