Kenwood TH-D74E Service Manual page 18

Ref. No. Use / Function Operation/Condition/Compatibility
D29,30 SW
D31 RF SW
D32,35 RF SW
D33,36 RF SW
D38 RF SW
D39 Reverse current
protector
D40,41 SW
D42,43 SW
D44 Surge protection
D45 RF SW
D171,172 BPF tuning
D173 RF SW
D175 SW
D177,178 BPF tuning
D179 RF SW
D180 RF SW
D181 RF SW
D182,184 BPF tuning
D185 RF SW
D186 SW
D188,189, BPF tuning
191
D192 RF SW
D193 RF SW
D194,195 Bar ANT tuning
D196 SW
D197 RF SW
D198 RF SW
D199 RF SW
D200 RF SW
D201 RF SW
D202 Bar ANT tuning
D204 RF SW
D361 RF SW
D362,363 RF SW
D364,365 RF SW
D366 Modulator
D367 Modulator
D369,372 Frequency
Control
D370,373 Frequency
Control
D374 RF SW
D375 RF SW
D376 Speed up
D378 RF SW
1-18 (No.RA044<Rev.001>)
TX AMP on/off
UHF TX
VHF TX
UHF TX
Local A-band
ATT switch
UHF TX
VHF TX
UHF RX A-band
UHF RX A-band
UHF RX
UHF RX B-band
UHF RX B-band
VHF RX
220M RX
VHF RX A-band
VHF RX A-band
VHF RX
VHF RX B-band
VHF RX B-band
UHF RX
AM radio
Bar ANT
HF RX B-band
Bar ANT
HF B-band
Bar ANT(MW)
HF B-band
AM radio
HF B-band
B-band RX Local
B-band Fin
B-band Local
B-band VCO2
B-band VCO1
B-band VCO2
B-band VCO1
B-band VCO2 Shift
B-band VCO1 Shift
Ripple filter
Local A-band
Ref. No. Use / Function Operation/Condition/Compatibility
D379 Speed up
D380 Modulator
D381 Modulator
D382 Frequency
Control
D383 RF SW
D576 Reverse Voltage
Protection
D577 Reverse Voltage
Protection
D578 OR Circuit
D579,580, Over Voltage
583 Protection
D587 Surge protection 8.4V DC/DC with Battery Charger
D588 Speed up
D673,674 BPF tuning
D675,700 Voltage protector Constant voltage
D710 Reverse current
protector
D720 SW
D721 LED
D801~812 LED
D882,883 VOX
2.3 TERMINAL FUNCTION
2.3.1 TX-RX UNIT (XC1-138)(1/7) CONTROL
Pin No. Name I/O
CN702( to LCD Module)
1 LEDK3 I LED cathode 3
2 LEDK2 I LED cathode 2
3 LEDK1 I LED cathode 1
4 LEDA O 40C power supply(LED anode)
5 VSSA - Analog GND
6 VSSA - Analog GND
7 VCC O 3V power supply
8 VCC O 3V power supply
9 DC O LCD driver data/command
10 /CS O LCD driver CS signal
11 /RESET O LCD driver RESET signal
12 /RD O LCD driver RD signal
13 /WR O LCD driver WR signal
14 IMO O Interface mode select
15 BD15 I/O LCD driver bus data output
16 BD14 I/O LCD driver bus data output
17 BD13 I/O LCD driver bus data output
18 BD12 I/O LCD driver bus data output
Ripple filter
A-band VCO Shift
A-band VCO
A-band VCO
Local B-band
Battery
DC-IN
3.1V Power Supply
Power ON Logic for DC IN or
Battery Insert
8.4V DC/DC with Battery Charger
FM radio
Bus switch power on/off
TX/busy
Back Light
Current steering
Function
switching signal