iv Table of Contents
September 26, 2003 6881096C77-O
3.1.5 On-/Off-Hook Control........................................................................................................3-3
3.1.6 Backlight Circuit ................................................................................................................3-3
3.1.7 Power Supply....................................................................................................................3-3
3.1.8 Status LEDs......................................................................................................................3-3
3.1.9 Jumper Selection ..............................................................................................................3-3
3.1.10 Power On/Off ....................................................................................................................3-4
3.1.11 Miscellaneous Functions...................................................................................................3-4
3.2 W4, W5, and W7 Control Heads....................................................................................................3-4
3.2.1 Power Switch/Ignition........................................................................................................3-4
3.2.2 Voltage Regulator .............................................................................................................3-5
3.2.3 Microcomputer ..................................................................................................................3-5
3.2.4 Interface Circuitry..............................................................................................................3-5
3.2.5 Reset.................................................................................................................................3-6
3.2.6 Bus Busy...........................................................................................................................3-6
3.2.7 Serial Bus Data.................................................................................................................3-6
3.2.8 Push-To-Talk (PTT) ..........................................................................................................3-7
3.2.9 Hang-Up Button (HUB) .....................................................................................................3-7
3.2.10 Ignition Sense Circuitry.....................................................................................................3-7
3.2.11 Keypad Scan.....................................................................................................................3-7
3.2.12 Vacuum Fluorescent (VF) Voltage Converter Circuitry.....................................................3-7
3.2.13 Vacuum Fluorescent Display Driver IC.............................................................................3-8
3.2.14 Vacuum Fluorescent Display ............................................................................................3-8
3.2.15 Backlight LEDs..................................................................................................................3-8
3.3 W9 Control Head ...........................................................................................................................3-8
3.3.1 Display ..............................................................................................................................3-8
3.3.2 W9 Controls and Indicators...............................................................................................3-9
3.3.3 Control Board....................................................................................................................3-9
3.3.3.1 Microprocessor ........................................................................................................3-9
3.3.3.2 Watchdog Timer.......................................................................................................3-9
3.3.3.3 Bus Transceiver.....................................................................................................3-10
3.3.3.4 Vacuum Fluorescent Voltage Converter................................................................3-10
3.3.3.5 Vehicle Interface Ports...........................................................................................3-10
3.3.3.6 Power Supply.........................................................................................................3-10
3.3.3.7 Ignition Sense Circuits ...........................................................................................3-10
3.3.3.8 EEPROM Write-Protect Circuit ..............................................................................3-11
3.3.4 Display Board..................................................................................................................3-11
3.3.4.1 VF Display..............................................................................................................3-11
3.3.4.2 VF Display Driver...................................................................................................3-11
3.3.4.3 Status LEDs...........................................................................................................3-11
3.3.4.4 Backlight LEDs.......................................................................................................3-11
3.3.5 Default Jumper Settings..................................................................................................3-11
3.4 Vehicle Interface Port (VIP) .........................................................................................................3-12
3.4.1 W4, W5, and W7 Control Heads.....................................................................................3-12
3.4.1.1 VIP Output Connections ........................................................................................3-12
3.4.1.1.1 Dash-Mount Installations ................................................................................3-12
3.4.1.1.2 Remote-Mount Installations ............................................................................3-13
3.4.1.2 VIP Input Connections (Remote-Mount Only)........................................................3-13
3.4.2 W9 Control Heads...........................................................................................................3-14
3.4.2.1 VIP Output Connections ........................................................................................3-14
3.4.2.2 VIP Input Connections ...........................................................................................3-14
Chapter 4 Test Equipment and Service Aids ..................................... 4-1
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