2-6 Passport 8/12 Service Manual
2.4 Front Housing Assembly
2.4.1 Main Board
The main board is the control center of the system. It provides communication, display, and data storage functions,
including:
Display drive and backlight control
Wired and wireless network
Data Storage
Printing
Serial port communication
Connection with touchscreen control board
Audio drive
EEPROM drive
USB drive
2.4.2 Keypad
The keypad scans and detects the input of keys and knobs, integrates the power on/off key, and connects AC and
battery indicators.
Touchscreen
control board
Main board
Alarm lamp board
Keypad
Lock hatch
Wi-Fi module
Screws fastening the front and rear housing