Philips FM-2, Service Manual

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Checking the Battery
20 Chapter 3 - Tests and Error Codes
Checking the Battery
Before testing the monitor after repair or service, ensure that the battery itself is
not at fault. See “Battery Charging and Maintenance” on page 82.
Visual Test
Visually inspect the monitor and its accessories after a repair, and also on a
regular basis as part of routine maintenance. Ensure that the monitor, cables,
line cords, transducers and instruments have no visible evidence of damage that
may affect patient safety or monitoring performance. Do not use if there is any
sign of damage.
FM-2 Power-On Self-Test
When the monitor is turned on, it automatically performs a diagnostic self-test.
The self test continues during normal operation also. If the monitor fails its self
test, it will display an error screen, and will discontinue all monitoring
functions. In this case, it should be turned off and removed from service.
What Happens During the Power-On Self Test
• The executable program is loaded from flash memory into Random Access
Memory (RAM).
• A checksum algorithm is run to test the program just loaded into RAM.
• If the checksum test passes, the watchdog timer is started. The purpose of the
watchdog is to check that all tasks running concurrently on the monitor are
operating correctly.