Panasonic VL-SV75 Series Service Manual page 16

4.2.2.2 Main Board
Call Button (SW301)
Outline of Operation : When a visitor presses the Call Button, a chime tone will ring at the monitor station.
FM Signal Modulator (IC200)
Operating Power Supply : +5V (+5V : 2, 9pin)
Package : 24pin SOP
Outline of Operation : The frequency modulation of the video signal taken in from Camera Unit is carried out.
+5V Regulator (IC202)
Input Voltage : +20V
Output Voltage : +5V
Package : SOT-23-6W
Outline of Operation : It generate from +20V to +5V.
Voice Amplifier (IC100)
Operating Power Supply : +5V
Package : 8pin SSOP8
Outline of Operation :
• The voice signal from the Microphone is amplified and sent to the Monitor Station.
• The voice signal from the Monitor Station is amplified and sent to the SP amp (IC102).
Speaker Amplifier (IC102)
Operating Power Supply : +5V
Package : VSP-8pin
Outline of Operation : The voice signal from the Voice amp (IC100) is amplified and sent to the Speaker.
MCU (IC203)
Operating Power Supply : +5V
Package : 32pin QFP
Outline of Operation :
• It communicates with the Monitor Station by AM signal through IC200.
• It controls of the camera, the electric lock, and the lighting, by the operation from the Monitor Station.
• Control (zoom processing, backlighting compensation) of a camera is carried out by I2C communication.
• At night, MCU turns on LED200 and LED201 automatically based on the information from IC204.
Illumination sensor (IC204)
Operating Power Supply: +5V
Package: 4pin COB
Outline of Operation: The surrounding brightness is detected and the level is outputted to MCU.
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