TH-D72A/D72E
18
Ref. No.
Use/Function
Operation/Condition/Compatibility
D219
RF switch
VHF TX
D220
RF switch
UHF TX
D221
RF switch
VHF TX
D222
RF switch
UHF TX
D223
Switch
VHF TX
D225,226
Switch
TX protector
D227
RF switch
VHF TX
D228
Switch
VHF TX
D351
Current steering
AM
D352
Switch
AM
D432,433
Speed up
Band A PLL
D434,435
Frequency control
Band A VCO
D436
Speed up
Ripple fi lter
D437
RF switch
UHF band A 1st local
D511
Speed up
DC/DC converter
D513
Speed up
Ripple fi lter
D514,515
Speed up
Band B PLL
D516,517
RF switch
Band B PLL
D518
RF switch
VFO shift
D519~522
Frequency control
Band B VCO
D523,524
Modulator
Band B VCO
D525
RF switch
VCO shift
D643
Constant voltage
Voltage protector
Ref. No.
Use/Function
Operation/Condition/Compatibility
D644
Reverse current
protector
DC-IN
D645
Constant voltage
Voltage protector
D646
Reverse current
protector
D647
Constant voltage
Voltage protector
D648
Voltage shift
D649
Current steering
DC/DC converter
D650
Reverse current
protector
D701~705
Surge protection
D706
Speed up
SP mute
D707
Switch
SP mute
D709
LED
TX/Busy
D710~715
LED
Back light
D716
Current steering
VOX
D717
LED
TX/Busy
D718~723
LED
Back light
D725,726
Current steering
VOX
D727
Reverse current
protector
Back up battery
D729~739
Reverse current
protector
16 key
D740
Constant voltage
Lamp B
D741
Reverse current
protector
COMPONENTS DESCRIPTION
TX-RX unit (X57-784X-XX) (A/3): Control
Pin No.
Pin Name
I/O
Function
CN701 (to GPS module, encoder volume)
1
GP_ON
O
Not used
2
33GP
O
GPS power supply (3.3V)
3
RXD_IGPS
I
RXD for GPS
4
TXD_IGPS
O
TXD for GPS
5
GP_PS
O
GPS save control
6
AFVI
O
Audio input to volume
7
AFVO
I
Audio output from volume
8
GND
-
GND
9
NC
-
Not used
10
GP_BU
O
GPS backup power supply
11
GND
-
GND
Pin No.
Pin Name
I/O
Function
12
ENC1
I
Encoder input 1
13
GND
-
GND
14
ENC2
I
Encoder input21
CN703 (to LCD module)
1
/CS
O
Chip select for LCD
2
/RES
O
Reset for LCD
3
A[0]
O
D[0]~D[7] output select
4
/WR
O
WR for LCD
5
D[0]
O
Data output
6
D[1]
O
Data output
7
D[2]
O
Data output
8
D[3]
O
Data output
9
D[4]
O
Data output
TERMINAL FUNCTION