Welch Allyn Spot Vital Signs 4400, Service Manual

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Power-up sequence
Overview
The system performs a power-on self test (POST) of the software and internal hardware each time
the device is powered on. Specific tests performed include the following:
•
CVC-PIC tests
• LED power tests
• eMMC (memory) tests
• EEPROM tests
If all tests are successful, the system completes power up, the Home tab appears, and the system is
ready for operation.
If the self-check fails, an error message and an error code appear in the system status area at the
top of the screen to aid service personnel and engineers in diagnosing the problem. If a fault that
could adversely affect the product is detected, the system enters a safe mode and stops all vitals
functions. The system remains in safe mode until it is turned off by pressing or until the device
shuts down automatically after a period of inactivity.
To perform the POST:
1. Disconnect any patient cables connected to the system.
2. Insert a fully charged battery into the system.
3. Power up the device and confirm the following:
a. The buzzer generates a sound.
b. A startup screen appears briefly and then disappears.
c. The power button flashes until the UI is ready.
d. The Home tab appears.
Power
The Power button, located on the lower-left corner of the device, performs multiple functions.
• Powers up the device
• Wakes the device from Sleep mode
• Opens a pop-up dialog with controls to power down, enter Sleep mode, or cancel
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