4535 611 98931 iE33 Service Manual Page 84
CSIP Level 1 Theory of Operation: Physical Structure
• Voltage is bled off immediately when power is removed. There are no components to store
power even if the backlight is defective or not connected.
• Sleep command from the system holds off backlight until a predetermined point in the
bootup cycle.
WARNING Voltages of 600 Vac or higher are present on the lower end of the Backlight Inverter when sys-
tem power is applied. Do not touch the inverter to avoid shock hazard.
Touch Screens (2)
• Connected to the Control Panel Connector Board.
• Thin, pressure-resistive, transparent film overlays the 800 x 600 LCD display mounted to the
Control Panel Module. That film is scanned by a USB chip set that sends screen coordinates
to the Host operating system when the user touches the overlay. The coordinates represent
the X, Y location of the pressure point that is registered to a displayed button.
• User selection of imaging parameters and control settings. Provides a virtual button press
using a graphical interface.
• The touch screen lights are powered by the Backlight Inverter.
NOTE The touch screens contain mercury and must be returned to Philips for disposal.
Disk Drives
• The DVD drive is used to upgrade system software and transducer files (transducer-specific
AP&I data) and may also be used to store images.
• Two hard drives for the SIP Motherboard: Each drive has one high-speed partition (on the
outer edge of the platter) and one or more operating system partitions. One of the two
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