Philips 221P3LPYEB/00, Service Manual

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112 Meridian 3
3.18.8 Monitor Audio Amplifier Input Impedance
The monitor audio amplifier shall have minimum 10K ohm AC input impedance.
3.19 USB HUB 2.0 Support
Connect the HUB port of the monitor to host PC’s USB port via USB cable, then attach external device to the
downstream port of the monitor. Check if the device can work properly.
3.20 Power Sensor
Functional Requirement for the front detection
For the presence sensor functionality, the following requirements are defined.
y
Two IRs be used for user present detections, one IR is for transmission signals, the other one is for receiving
reflection IR signals.
y
User must be detected in the following range: 0 up to 100cm (+20 cm)
y
Detection angle: +/- 30 degree
y
Sensor key control: adjust detection distance (0~4 scales), default is 3
0: off, 1: 55 cm, 2: 70 cm, 3: 85 cm, 4: 100cm
y
Anti-interference between two monitors, monitors must have anti-interference methods (coding…etc) to
prevent monitors to talk to each other.
Power Sensor Functional Behavior
Time Period 60sec 60sec ~ 180sec 180sec ~
Power Sensor No ACTION
Lower down backlight
brightness Backlight & LCD panel
shutdown
Power Saving 0 50% 80%
The following setup will be supported:
Monitors standing back to back