Notes For All Schematics and Circuit Boards Section 1: 2-7
6881091C63-F
GP x OUT ACC y General Purpose Input x from Accessory
Connector Pin y
GPIO General Purpose Input Output Lines
HANDSET AUDIO Handset Audio Output
HOOK Hang-up Switch Input
HSIO High Speed Clock In / Data Out
IF First Intermediate Frequency Signal
IGNITION CONTROL Ignition Line to switch on the Radio's Voltage
Regulators
IN 5V RF REG Supply Voltage for 5V Regulator in RF Section
INT KP COL Internal Keypad Matrix Column Signal
INT KP ROW Internal Keypad Matrix Row Signal
INT MIC Internal (from Control Head) Microphone Input
INT SWB Internal Switched 13.2V Supply Voltage
INT SWB+ Internal Switched 13.2V Supply Voltage
IRQ Interrupt Request from Control Head
K9V1 9.1V in Transmit Mode
KEYPAD ID Keypad Identification Line
LCD A0 LCD Control / Display Data Select
LCD CS LCD Chip Select
LCD DATA LCD Data Lines
LCD E RD LCD Enable Read
LCD RW WR LCD Read Write Control
LED CNTRL LED Control Lines
LED GREEN Green LED Control
LED RED Red LED Control
LED YELLOW Yellow LED Control
LOCK Lock Detect Signal from Synthesizer
LSIO Low Speed Clock In / Data Out
LVZIF CS LVZIF Chip Select (not used)
MIC Microphone Input
MISO Serial Peripheral Interface Receive Line
MODIN Modulation Signal into the Synthesizer
MOSBIAS 2 PA Bias Voltage for Second Stage
MOSBIAS 3 PA Bias Voltage for Third Stage
NOISE BLNKR Noise Blanker Enable (Low Band only)
ON OFF CONTROL Service Request Line from Control Head / Manual
Switching On of the Radio's Voltage Regulators
ON OFF SENSE (Control Head) On/Off Sense Line to Control Head µP
ON OFF SENSE (Controller) Service Request Line from Control Head
OPT CS Option Board Chip Select
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