Motorola Commercial CM Series, Service, Maintainability

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2-6 MAINTENANCE
MIC_PTT_CH Microphone PTT Input
MOD_IN Modulation Signal from ASFIC
MOD_OUT Modulation Signal to the Synthesizer
ONOFF_SENSE On off sense switch
OPT_DATA_R_OPRD DATA/Ready Request from Option Board
OPT_EN_OPBD Option Board Chip Select
PA_BIAS PA Control bias voltage
PA_CURRENT Not used
POST_LIMITER_TX
AUDIO_RETURN_OPT_BRD Flat TX Input from Option Board
PROG x IN ACC y General Purpose Input x accessory connector Pin y
PROG x INOUT ACC y General Purpose Input/Output x accessory connector Pin y
PROG x OUT ACC y General Purpose Input x accessory connector Pin y
PWR_SET PA Power Control Voltage
RESET Reset Line
RSSI Received Signal Strength Indicator
RX RX signal
RX AUD RTN Option Board Input/Output of Receiver Audio Path
RX_AUDIO_OUTPUT_ACCESS_CONN Flat or filtered audio to accessory connector
RX_EN Enable Receiving
RX_INJ RF signal from VCO into the Receiver
SCI_CH Bi-directional serial communication line
SHIFT_R_CS SPI Chip select for the Control Head
SPI_CLK Serial peripheral interface bus CLOCK
SPI_MISO Serial peripheral interface bus data IN
SPI_MOSI Serial peripheral interface bus data OUT
SPKR- Negative Audio PA Speaker Output
SPKR- Negative Audio PA Speaker Output
SPKR+ Positive Audio PA Speaker Output
SQ_DET Squelch Detect Signal
SYNTH_CS Synth Chip Select
SYNTH_LOCK µP Clock Lock Signal
TX AUDIO_RETURN_OPT_BRD Option Board Output to Transmit Audio Path
TX AUDIO_SEND_OPT_BRD Microphone Audio to Option Board
TX_INJ RF signal from the VCO to transmitter PA
TX_EN Enable transmitting
UNMUTED RX_AUDIO_SEND_OPT_BRD Unmuted filtered audio to option board
uP_CLK µP Clock signal
VoL_INDIRECT Volume Pot Input
VOX Voice operated transmit level