Icom IC-2820H Service Manual page 16

PIN
PORT NAME
No.
AF mute signal to the SP mute switch
83 L_AF_MUTE
(Q102).
Input port for [PTT] key on the connected
85 MIC_PTT
microphone.
100 RESET Reset enable signal input.
Noise signal from the IF IC (Left band;
101 L_SQL
IC15).
102 CL_SFT2 Clock frequency shifting signal.
Noise signal from the IF IC (Right band;
105 R_SQL
IC18).
122 R_DATA Data lines for the control unit.
123 TX_DATA Data lines for the control unit.
127 TX232 Data bus for RS-232C communication.
128 RX232 Data bus for RS-232C communication.
129 DA_CK Serial clock signal to the D/A converter.
130 DA_DATA Serial data to the D/A converter.
134 DA_STB Strobe signal to the D/A converter.
135 R_R5C RX circuits (Right band) control signal.
Power line control signal to the 375−550 MHz
136 R400_S
band RF circuit (Right band).
Power line control signal to the 810−1000
137 R_RX800
MHz band RF circuit (Right band).
AM-demodulator circuit (Right band)
138 R_AMC
control signal.
143 DTMSD Data to the DTMF decoder (IC56).
144 DTMCK Clock signal to the DTMF decoder (IC56).
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