Agilent Technologies M1205A V24, Service Manual

Page: 134 / 358

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Description of the Boot Process
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The boot process takes place in the following four stages:
Hardware self test.
File transfer.
Software initialization - phase 1.
Software initialization - phase 2.
When all tests are successful and no hardware failures are detected, the boot process lasts
between 12-15 seconds before ECG monitoring can begin. These tests are described in detail
in the following subsections.
All start modes of the system (hot, warm, and cold starts) follow these four stages. Only the
status of the system at the last power down, and the time elapsed before the system is
powered on again, determine the start mode. In all start modes the ECG parameter screen is
displayed between 12-15 seconds after the start-up is requested.
The actions performed in each start mode also differ in the extent to which the system
components are tested. For example, a cold start runs more extensive memory tests than
warm or hot starts.
An extended test can be activated in the Service Mode to run an extensive test of the Monitor.
When selected, the extended test takes over the system after the hardware configuration has
been determined in Stage 2 of the boot process.
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During the first stage of the boot process all subsections in the System Board run their self-
tests. The success of the tests is indicated by the red LEDs on the System Board.
At the start of the self test, the red LEDs are lit for 1 second, and then the SDN LED is turned
off and the other two LEDs blink during normal operation.
Immediately following this stage, the system checks whether an external tool is connected,
for example a cloning tool. If an external tool is detected, then it is given full control of the
self-tested system hardware; none of the system software is activated.
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After 4 to 6 s from the boot request, information about the System Board configuration is
read from the central EEPROM. This information indicates what software must be present.