Kenwood TH-D74E Service Manual page 20

Pin No. Name I/O
4 ENC2 I Encoder data 2
5 GND - GND
6 ENC1 I Encoder data 1
2.3.2 TX-RX UNIT (XC1-138)(2/7) TX-RX
Pin No. Name I/O
CN182(to MW/SW)
1 BFMS O Band B switch signal for
2 FMOUT I FM Radio RF signal
3 SWANT_S O SW bar antenna on/off switch signal
4 GND - GND
5 GND - GND
6 HFIN O Band B HF RF signal
7 MWANT_S O MW bar antenna on/off switch signal
8 GND - GND
9 GND - GND
10 BHFS O Band B switch signal for power
11 OBPFB O Band B BPF adjustment signal
12 GND - GND
13 GND - GND
14 HFOUT I Band B HF RF signal
15 OAGCB O Band B AGC signal
16 GND - GND
17 GND - GND
18 GND - GND
19 47C O 47C power supply
20 47C O 47C power supply
CN401(to VCO B)
1 VCO2 O Band B switch signal for power
2 CV_B O Band B lock voltage
3 33BF O Band B VCO Power supply
4 GND - GND
5 UCW_VCO - NC
6 GND - GND
7 VCO1 O Band B switch signal for power
8 GND - GND
9 SHIFT_B O Band B VCO shift signal
10 VCO_MOD O Modulation signal for VCO
11 GND - GND
12 GND - GND
13 GND - GND
14 NC - NC
15 GND - GND
16 VCO_B I Band B VCO signal
1-20 (No.RA044<Rev.001>)
Function
Function
power supply(76-108MHz)
supply(0.1-76MHz)
supply(VCO2)
supply(VCO1)
Pin No. Name I/O
CN501(to VCO A)
1 VCO_A I Band A VCO signal
2 Fin_A O Band A PLL RF input signal
3 GND - GND
4 GND - GND
5 GND - GND
6 GND - GND
7 GND - GND
8 NC - NC
9 33CA O 33CA power supply
10 GND - GND
11 GND - GND
12 GND - GND
13 GND - GND
14 GND - GND
15 SHIFT_A O Band A VCO shift signal
16 CV_A O Band A lock voltage
CN661(to CONTROL)
1 +B O +B power supply
2 DET1 O power detect signal
3 +B O +B power supply
4 DET2 - NC
5 TCXO VCOM I Modulation signal for TCXO
6 CURR O Final current detection voltage
7 40C O 40C power supply
8 SQA O Band A squelch voltage signal
9 40C O 40C power supply
10 GND - GND
11 RAINT I Interrupt signal for radio
12 BPFA I Band A BPF adjustment signal
13 47C O 47C power supply
14 AFA O Band A audio signal
15 AGCB I Band B AGC signal
16 SMA O Band A RSSI voltage signal
17 IFB O Band B SSB/CW/AM/IF signal
18 LDA O Band A lock detect signal
19 AFB_FM O Band B D-star/FM audio signal
20 PRHOTB O Processor hot signal
21 SQB O Band B squelch voltage signal
22 PMO O Voltage output signal for charge
23 SMB O Band B RSSI voltage signal
24 LDB O Band B lock detect signal
25 I2CCK I I2C CLK signal for charge IC
26 /RST_R O RESET signal for radio IC
27 I2CDT I/O I2C DATA signal for charge IC
28 GND - GND
Function