Kenwood TH-D72A User manual

SERVICE MANUAL
This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
© 2010-11 PRINTED IN JAPAN
B51-8944-00 (N)277
TH-D72A/D72E
144/440 (430) MHz FM DUAL BANDER
Whip antenna
(T90-1087-05)
Knob (PTT)
(K29-9457-03)
Button knob
(MONI/LAMP)
(K29-9460-03)
Button knob (Cross)
(K29-9464-03)
Packing (Chassis)
(G53-1843-11)
Knob (Volume)
(K29-9458-03)
Knob (Encoder)
(K29-9459-13)
Cap (SP/MIC)
(B09-0736-03)
Plastic cabinet assy
(A02-4092-13)
Front glass
(B10-2797-12)
CONTENTS
DISASSEMBLY FOR REPAIR ......................2
CIRCUIT DESCRIPTION ..............................4
SEMICONDUCTOR DATA.........................12
COMPONENTS DESCRIPTION.................16
TERMINAL FUNCTION .............................18
PARTS LIST ...............................................20
EXPLODED VIEW ......................................35
PACKING....................................................36
TROUBLE SHOOTING ..............................37
ADJUSTMENT ..........................................39
PC BOARD
TX-RX UNIT (X57-784X-XX) (A,B/3) ....56
TX-RX UNIT (X57-784X-XX) (C/3)........60
INTERCONNECTION DIAGRAM ..............64
SCHEMATIC DIAGRAM ............................66
BLOCK DIAGRAM .....................................82
LEVEL DIAGRAM ......................................84
OPTIONAL ACCESSORIES
BT-15 (Battery Case) .............................86
PB-45L (Li-ion Battery Pack).................86
SPECIFICATIONS ......................................87

TH-D72A/D72E
2
Document Copyrights
Copyright 2010 by Kenwood Corporation. All rights re-
served.
No part of this manual may be reproduced, translated,
distributed, or transmitted in any form or by any means,
electronic, mechanical, photocopying, recording, or other-
wise, for any purpose without the prior written permission
of Kenwood.
Disclaimer
While every precaution has been taken in the preparation
of this manual, Kenwood assumes no responsibility for er-
rors or omissions. Neither is any liability assumed for dam-
ages resulting from the use of the information contained
herein. Kenwood reserves the right to make changes to any
products herein at any time for improvement purposes.
1. How to Remove the Case Assembly
from the Chassis
1. Remove 2 screws q.
2. Remove 2 knobs w.
3. Remove the SP/MIC jack cover e.
4. Remove the front panel from the chassis.
2. How to Remove the PCB
2-1. Control PCB (TX-RX A/3)
1. Remove the packing (CHASSIS) r.
2. Remove 1 screw tthen lift the SP holder and remove
the FPC y, u.
3. Remove 5 screws i, oand remove the packing (SP/
MIC) !0.
4. Lift the control PCB and remove the FPC !1, !2 from TX-
RX PCB.
2-2. RF PCB (TX-RX C/3)
5. Remove the top panel !3 from the chassis.
6. Remove the solder of the earth spring !4 and lift.
Note: After TX-RX PCB is fixed to the chassis with the
screws, the earth spring is installed.
7. Remove 10 screws !5, !6, and 3 round screw !7.
8. Lift the TX-RX PCB.
DISASSEMBLY FOR REPAIR
(X57-784)
(A/3)
CN715
CN719
(X57-784)
(A/3)
(X57-784)
(C/3)
@
@
.
;
=
=
8
2
8
B
B
>
>

8





 




:
:

TH-D72A/D72E
3
3. How to Remove the GPS Module
1. The GPS module is connected with FPC and fixed to the
chassis with the double-faced tape.
Then lift and pull out the GPS module with the small
screwdriver.
GPS module
DISASSEMBLY FOR REPAIR
4. Precautions for Reassembly
1. Push the FPC shown in figure when assemble PCB and
the chassis.
(X57-784)(C/3)
CN701
Lock type
connector (X57-784)
(A/3)
2. Do not touch tab of LCD holder FPC. FPC is damaged.
Please assemble FPC after it as shown in figure.
Tab
(X57-784)
(A/3)

TH-D72A/D72E
4
1. Outline
The TH-D72A/D72E is an FM Dual Band (A: 144/440MHz/
E: 144/430MHz) handheld transceiver designed to be used
as an Amateur Radio.
2. Frequency Configuration
This equipment has an individual VCO/PLL and IF circuit
for both Band A and B. Using these circuits, it can receive
2 separate bands and can transmit and receive at the same
time.
The VCO of Band A is used for the first-local oscillator for
VHF/UHF reception of Band A. The VCO of Band B is used
for VHF/UHF transmission with modulator by 2-VCOs and
for the first-local oscillator for VHF/UHF reception of Band B.
The reference oscillator of 16.8MHz connected with
each PLL IC for Band A and B are used as the comparison
frequency at each PLL IC. The reference oscillator of Band
A is generated three times to 50.400MHz and is used for
the second-local oscillator for the reception of Band A. The
second-local oscillator for the reception of Band B uses the
crystal oscillator of 45.505MHz.
Figure 1 Frequency configuration
TH-D72A (K-type) TH-D72E (E-type)
A 144.000 ~ 147.995MHz 144.000 ~ 145.995MHz
B 438.000 ~ 449.995MHz 430.000 ~ 439.995MHz
C 189.050 ~ 193.045MHz 189.050 ~ 191.045MHz
D 392.950 ~ 404.945MHz 384.950 ~ 394.945MHz
E 193.950 ~ 197.945MHz 193.950 ~ 195.945MHz
F 388.050 ~ 400.045MHz 380.050 ~ 390.045MHz
Table 1 Frequency configuration
x3
x2
50.400MHz
49.950MHz F
E
A
B
A
B
A
B
Band A
UHF RX
Band B
UHF RX
Band A
VHF RX
Band B
VHF RX
C
D
VHF TX
UHF TX
Band B
PLL
MIC
AMP
AF
AMP
16.800MHz
16.800MHz
45.505MHz
45.050MHz
Band B
Demodulator
Band A
Demodulator
455kHz
450kHz
Band A
PLL
CIRCUIT DESCRIPTION

TH-D72A/D72E
5
3. Receiver System
3-1. VHF receiver circuit
■A band VHF receiver circuit
The reception signal from the antenna passes through a
filter circuit and goes to the RF amplifier (Q11). The ampli-
fied signal then enters the band-pass filter. After the signal
passes through the band-pass filter, it is amplified by a sec-
ond RF amplifier (Q7) and passed through the band-pass fil-
ter before entering the mixer (Q2). The signal converted by
the first-local oscillator (Upper heterodyne) to generate the
first IF signal (49.950MHz) passes through the MCF (XF351),
is amplified by the IF amplifier (Q358) and then enters the
FM IC (IC353). The signal is converted to the second IF
signal (455kHz) by the second-local oscillator (Upper hetero-
dyne) which generated three times to 50.400MHz and is
detected to generate an audio signal.
■B band VHF receiver circuit
The reception signal from the antenna passes through a
filter circuit and goes to the RF amplifier (Q13). The ampli-
fied signal then enters the band-pass filter. After the signal
passes through the band-pass filter, it is amplified by a sec-
ond RF amplifier (Q8) and passed through the band-pass fil-
ter before entering the mixer (Q4). The signal converted by
the first-local oscillator (Upper heterodyne) to generate the
first IF signal (45.050MHz) passes through the MCF (XF352),
is amplified by the IF amplifier (Q359) and then enters the
FM IC (IC354). The signal is converted to the second IF
signal (455kHz) by the second-local oscillator (Upper hetero-
dyne) and is detected to generate an audio signal.
■VHF accompanying circuit
Each band-pass filter is tuned to a target frequency
through the variable-capacitance Diode by the tuning volt-
age output from E-Volume (IC721) controlled with the Main
MCU (IC737).
Figure 2-1 VHF receiver circuit
A band
AF
B band
AF
AGC
IC352
D352
SW
SW
SW
D351
AM
DET
IC351 Q352 Q354 Q356
455kHz
CF351
Q353
Q355
Q359 XF352
45.050MHz
Q4
1st Local
B band
D26,D27
D14,D15
Q8 D44,D45
D35,D36
Q13
Q16 AIP
SW
AIP
SW
Q15
IC611
Sub
MCU
IC721
E-
Volume
IC737
Main
MCU
VHF
BPF
Q11
D42,D43
D32,D33
Q7
D24,D25
D12,D13
Q2
XF351
49.950MHz
Q358
1st Local
A band
2nd Local
50.400MHz
2nd Local
45.505MHz
CF352
450kHz
IC353
A band demodulator
IC354
B band demodulator
DET
DET
CIRCUIT DESCRIPTION

TH-D72A/D72E
6
Figure 2-2 UHF receiver circuit
A band
AF
B band
AF
AGC
IC352
D352
SW
SW
SW
D351
AM
DET
IC351 Q352 Q354 Q356
455kHz
CF351
Q353
Q355
Q359 XF352
45.050MHz
Q1
1st Local
B band
D20,D21
D16,D17
D8,D9
Q5 D38,D40
D28,D29
Q9
Q12 AIP
SW
AIP
SW
Q14
IC611
Sub
MCU
IC721
E-
Volume
IC737
Main
MCU
UHF
BPF
Q10
D39,D41
D30,D31
Q6
D22,D23
D18,D19
D10,D11
Q3
XF351
49.950MHz
Q358
1st Local
A band
2nd Local
50.400MHz
2nd Local
45.505MHz
CF352
450kHz
IC353
A band demodulator
IC354
B band demodulator
DET
DET
3-2. UHF receiver circuit
■A band UHF receiver circuit
The reception signal from the antenna passes through a
filter circuit and goes to the RF amplifier (Q10). The ampli-
fied signal then enters the band-pass filter. After the signal
passes through the band-pass filter, it is amplified by a sec-
ond RF amplifier (Q6) and passed through the band-pass fil-
ter before entering the mixer (Q3). The signal converted by
the first-local oscillator (Lower heterodyne) to generate the
first IF signal (49.950MHz) passes through the MCF (XF351),
is amplified by the IF amplifier (Q358) and then enters the
FM IC (IC353). The signal is converted to the second IF
signal (455kHz) by the second-local oscillator (Upper hetero-
dyne) which generated three times to 50.400MHz and is
detected to generate an audio signal.
■B band UHF receiver circuit
The reception signal from the antenna passes through a
filter circuit and goes to the RF amplifier (Q9). The amplified
signal then enters the band-pass filter. After the signal pass-
es through the band-pass filter, it is amplified by a second
RF amplifier (Q5) and passed through the band-pass filter
before entering the mixer (Q1). The signal converted by the
first-local oscillator (Lower heterodyne) to generate the first
IF signal (45.050MHz) passes through the MCF (XF352), is
amplified by the IF amplifier (Q359) and then enters the FM
IC (IC354). The signal is converted to the second IF signal
(455kHz) by the second-local oscillator (Upper heterodyne)
and is detected to generate an audio signal.
■UHF accompanying circuit
Each band-pass filter is tuned to a target frequency
through the variable-capacitance Diode by the tuning volt-
age output from E-Volume (IC721) controlled with the Main
MCU (IC737).
CIRCUIT DESCRIPTION

TH-D72A/D72E
7
Figure 3 Transmitter circuit
RF
SW RF SW
RF
SW RF SW
D201 D204
RF
SW
Q212
D202
Q201
D205
IC202 Q214
VHF
LPF
430T
144T
RF
SW
RF
SW
RF
SW RF SW
D217
D220,D222
D215,D216
D219,D221
430T
144T
144T
RF
SW
RF
SW
D212
D211
UHF
HPF
UHF
HPF
UHF
LPF
VHF
LPF
VHF
LPF
UHF
HPF
UHF
LPF
VHF
LPF
430T
144T
Q215
IC201 Q207
From
VCO B
To
Q214
Q215 R216
R217 Sub
MCU TH
TH201IC611
–
+IC203
–
+
IC721
E-
Volume
D225,D226
Voltage
shift
IC737
Main
MCU
+B
D214
D223
D227
D228
4. Transmitter System
4-1. Transmitter circuit
The VHF TX signal of the VCO B output through the RF
amplifier (Q201) passes through the band switches (D202,
D205), is amplified with the Pre-drive amplifier (IC202) and
Drive amplifier (Q214), passes through the band switch
(D211) and is amplified to the final output level with the
Final amplifier (Q215). The signal then passes through the
antenna switch (D215, D216), Duplexer and LPF, and is fed
to the antenna.
The UHF TX signal of the VCO B output through the RF
amplifier (Q201) passes through the band switches (D201,
D204), is amplified with the Pre-drive amplifier (IC202) and
Drive amplifier (Q214), passes through the band switch
(D212) and is amplified to the final output level with the
Final amplifier (Q215). The signal then passes through the
antenna switch (D217), Duplexer and LPF, and is fed to the
antenna.
4-2. APC circuit
The Automatic transmission Power Control (APC) is a cir-
cuit to obtain a steady TX Power, and controls the TX Power
detecting the drain current of the Drive amplifier (Q214) and
Final amplifier (Q215). The voltage difference generated by
the drain current in the resisters (R216, R217) is amplified
with the OP-Amplifier (IC201) and DC Amplifier (Q207), and
the detecting voltage is obtained. The control voltage output
from E-volume (IC721) controlled with the Main MCU (IC737)
according to each band and TX Power is prepared. These
two obtained voltages are compared with the OP-Amplifier
(IC203) and obtains the APC voltage. The Gate voltage
of the Drive amplifier (Q214) and Final amplifier (Q215) is
changed depending on this APC voltage and the TX Power
is controlled.
4-3. Thermal protection circuit
The Sub MCU (IC611) observes the detecting voltage
by the Thermistor (TH201) arranged to prevent the thermal
fracture of the Final amplifier (Q215). The APC voltage is
changed when the preset temperature is exceeded, and
excessive generation of heat is prevented by controlling the
TX Power.
5. VCO-PLL Circuit
5-1. Oscillator circuit
The reference frequency (16.800MHz) generated with
the TCXO (X431) of the Band A oscillation circuit is divided
frequency in the PLL IC (IC431) and obtains the comparison
frequencies of 5kHz or 6.25kHz. Similarly, the reference
frequency (16.800MHz) generated with the TCXO (X511) of
the Band B oscillation circuit is divided frequency in the PLL
IC (IC513) and obtains the comparison frequencies of 5kHz
or 6.25kHz. The reference oscillator of Band A generated to
three times with the RF amplifier (Q357) is used also for the
second-local oscillator for the reception of Band A.
The Band A VCO oscillates and is amplified with oscilla-
tion amplifier (Q435), and output to the F-in amplifier (Q434)
and F-out amplifier (Q437) through the Buffer amplifier
(Q436). The Band B VCO oscillates and is amplified with
two oscillation amplifiers (Q522, Q523), and output to the
F-in amplifier (Q521) and F-out amplifier (Q201) through the
Buffer amplifier (Q524). To improve the modulation charac-
teristics of the DCS and 9600bps packet signal, the modula-
tion is put on the TCXO (X431) of Band B.
5-2. Phase comparator
The PLL ICs (IC431, IC513) of the pulse-swallow method
divides the input oscillator frequency and reference fre-
quency according to the PLL Data from the Sub MCU (IC611),
and achieves the PLL synthesizer corresponding to the step
frequency by comparing phases.
CIRCUIT DESCRIPTION

TH-D72A/D72E
8
Mod
RF
SW
RF
SW
RF
SW
RF
SW
1/R PD 1/N
A band PLL IC
1/R PD 1/N
B band PLL IC
LDA
LDB
Sub
MCU
Main
MCU IC611
IC737
IC721
E-
Volume
REF_A
D514,D515
D432,D433 Q435
Q522
Q523
D523,D524
Q524
Q436 Q437
Q201
Q521
RF
SW
Q434
VHF
A band
1st Local
UHF
A band
1st Local
VHF
B band
1st Local
UHF
B band
1st Local
D6
Q438
D437
x2
A band
2nd Local x3
X431
X511
REF_B
&TC
IC431
IC513
TX
D5
D7
Q204
D203
Q357
Figure 4 VCO-PLL circuit
5-3. Lock voltage
The pulse signal obtained by the phase comparison in
each PLL IC (IC431, IC513) is sweep-output with the built-in
charge-pump. After removing the ripple with the loop-filter,
it controls the oscillator frequency as a control voltage of
each VCO.
5-4. Unlock detection circuit
The terminal LD (pin 14) of each PLL IC (IC431, IC513)
outputs the “L” level at the Unlock statement. The main
MCU (IC737) observes this, and controls the change timing
of transmission, reception, etc.
6. Power Supply Circuit
6-1. DC-IN circuit
The DC-DC IC (IC644) operates according to the control
signal from the Reset IC (IC639) when the power supply is
supplied to the DC-IN JACK, and +B voltage is obtained. +B
voltage changes with the DC switch (Q663) controlled with
the Sub MCU (IC611), and obtains 10.8V (reception) and 8.0V
(transmission).
6-2. Lithium-ion battery charging control circuit
When the power supply is supplied to the DC-IN JACK
with the Lithium-ion battery installed, the charge processing
is done to the Lithium-ion battery.
The main MCU (IC737) recognizes that the DC switch
(Q642) becomes “L” level when the power supply is sup-
plied to the DC-IN JACK, and assumes the gate of the DC
switch (Q648) to be “H” level, and it is turned on. If the
comparator IC (IC641) is “L” level (approximately 8.4V or
less) at this time, the DC switch (Q646) is turned on. As a
result, a constant voltage of about 1.5V is impressed from
the regulator IC (IC643) to the base of the DC switch (Q643),
the current between the collector-emitter becomes con-
stant, and the current that flows to the Lithium-ion battery is
constantly controlled.
Moreover, the current is switched by turning the DC
switch (Q653) on and off according to the voltage of the
Lithium-ion battery, and the charge is switched preliminary
and usually charge (preliminary charged in 6V or less). The
voltage detection of the Lithium-ion battery has gone by
the differential amplification by OP-Amplifier (IC642). The
sub MCU (IC611) is protected from the detecting voltage at
Power-off with the DC switch (Q662).
Normally, when pin 5 of the comparator IC (IC641) be-
comes “H” level (approximately 8.4V or more), the DC
switch (Q646) is turned off, and it changes into the charging
status in the constant voltage because the base voltage of
the DC switch (Q643) is not stable. The emitter voltage of
the DC switch (Q643) is observed by the sub MCU (IC611)
so that the current may decrease gradually in the constant
voltage charge. When the threshold is exceeded, the DC
switch (Q648) is turned off and the charge is stopped.
6-3. Protection circuit
The environmental temperature detected with the
Thermistor (TH703) is observed with the Main MCU (IC737),
and the DC switch (Q648) is assumed turned off, and the
charge is stopped when it is out of the temperature range
(0°C≤Temp.≤45°C).
When the excess voltage is impressed from the DC-IN
JACK, the circuit is protected by intercepting the power sup-
ply with the DC switches (Q649, Q645).
Moreover, power consumption is reduced by intercept-
ing the DC switches (Q651, Q652) according to the SAVE1
signal from the Sub MCU (IC611) while in save mode.
CIRCUIT DESCRIPTION

TH-D72A/D72E
9
DC
SW
DC
SW
DC
SW
DC
SW
DC
SW DC SW
DC
SW
DC
SW
DC
SW
DC
SW
DC
SW
DC
SW
DC
SW
DC
SW
DC
SW
Regulator
3.3V 33M
IC715
V
detector
AFB
Main
MCU
TH IC713
Regulator
4.5V
DC-DC
controller
DC-DC
converter
IC645
Regulator
3.3V 33C
IC718
Regulator
4.7V
Sub
MCU
Regulator
5.3V
Regulator
3.3V
Comp.
8.4V
47C 45RVAM
33CA
IC719
Q652
IC611
IC642
+
–
BT_V
IC646
Regulator
1.5V
IC643 Q646
IC641
Q651
SAVE1
SAVE1
DC
SW
A_S
DC
SW
DC
SW
33CB
33RB
PLL_B
VP
PLL_A
VP
B_S
45RVAM_S
Q615
45RUB
DC
SW
45RUB_S
Q611
45RVB
DC
SW
45RVB_S
Q614
45RUA
DC
SW
45RUA_S
Q613
45RVA
DC
SW
45RVA_S
45C
Q612Q656
DC
SW
Q650
DC
SW
DC
SW
DC
SW
Q649
Q645
Q642 DC_S
+B
Q658
DC-DC
reset
IC644
IC639
Q663
LAMP
B
C_S
INT
AFB
AFB_S
IC705
Q721
Q722
LAMP
IC737
DC_DET
TH703
D650
Q662
D646
Q643
CHG
Q648
PRE_CHG
Q653
Q657
Q654
33RB_S
Q616
IC512 IC514
Q655
Q659
+
–
Battery
Terminal
DC-IN
JACK
Figure 5 Power supply circuit
7. AF Signal System
7-1. Reception AF circuit
■Demodulation signal circuit
The reception AF signal demodulated by each IF IC
(IC353, IC354) for Band A/B is independently input to E-vol-
ume (IC721). The volume balance in each Band is pre-set.
To assume the AF level from the SP to be about the same in
each mode of Wide/Narrow, the output level of E-volume is
adjusted to half at the Wide mode in Narrow mode.
The reception AF signal passes the de-emphasis circuit
(Q718, Q717, Q715) and AF MUTE switch (Q711), and en-
ters the AF VOL for the loudness control. In addition, it is
amplified by the Final AF Amplifier (IC734), and SP is driven
through the SP MUTE switch (Q703).
Moreover, power consumption is reduced by intercept-
ing the DC switch (Q709) according to the SAVE2 signal
from the Main MCU (IC703) in save mode.
■Tone decode circuit
The reception AF signal when the CTCSS, DCS and
Weather-alert-function (K-type only) are used, amplifies the
selected signal to the necessary level with the active filter
amplifier (IC722) individually prepared for Band A/B, and pro-
cesses the decode with the Main MCU (IC737).
■BEEP, DTMF circuit
The BEEP and DTMF signals generated from the Main
MCU (IC737) are input to the Final AF Amplifier (IC734), and
drive the SP through the SP MUTE switches (Q702, Q703).
When the BEEP and DTMF signals are output, it is as-
sumed that MUTE-ON by the AF MUTE switch (Q711) con-
trolled with the Main MCU (IC737), and it is separated and
output with the reception AF signal.
■Squelch circuit
The Main MCU (IC737) takes the noise element (SQA,
SQB) and signal strength (SMA, SMB) obtained from each IF
IC (IC353, IC354), and controls the AF MUTE switch (Q703).
CIRCUIT DESCRIPTION

TH-D72A/D72E
10
Figure 6-1 Reception AF circuit
DC
SW
DC
SW
De-
emphasis
AF
SW
Q711
Q709
IC720
SQA
SQB
SMA
SMB
AF
SW
Q703
J701 (2/2)
Q702
Q728 IC733IC732
IC728
TNC
ASIC
TNC
MCU
IC727
EXT.
SP
INT.
SP
Q729
1200 R-data
SAVE2
BEEP
SPM AFM
DTMF
IC737
Main
MCU
WXCTIN_A
IC722
(B/4,C/4,D/4)
WXCTIN_B
Q718
Q717,Q715
E-
Volume
PKD_BND
SW IC
IC721
DET_A
DET_B
IC734 AF VOL
9600 R-data
7-2. Transmission AF circuit
■Modulation signal circuit
The transmission AF signal from the microphone is am-
plified by the MIC amplifier (IC712) that accompanies the
AGC amplifier (IC714), and passes the MIC MUTE switch
(Q714) controlled with the Main MCU (IC737), and is input
to E-volume (IC721) through the Pre-emphasis circuit (IC716)
composed of the IDC and splatter-filter. The transmission
AF signal that the level is adjusted here is input to VCO B as
high-speed modulation signal (MOD).
The Tone and DTMF signals made from the Main MCU
(IC737) are mixed with the transmission AF signal and input
to E-volume (IC721) through the the pre-emphasis circuit
(IC716). Similarly, the 1200bps Packet-T Data made from
the TNC ASIC (IC728) is mixed with the transmission AF
signal and is input to E-volume (IC721) through the pre-
emphasis circuit (IC716). On the other hand, the 9600bps
Packet-T Data made from the TNC ASIC (IC728) does not
pass through the pre-emphasis circuit but is input directly to
E-volume (IC721). The transmission AF signal that the level
is adjusted here is input to the TCXO (X511) as a low-speed
modulation signal (TC).
■VOX circuit
The transmission AF signal is amplified by the VOX am-
plifier (IC714), and detected with the DC-detector (D716). As
a result, the obtained DC voltage is input to the Main MCU
(IC737), and observes the level of the audio signal.
Figure 6-2 Transmission AF circuit
Pre-emphasis
IDC/SPL
AF
SW
AF
SW
Q714
Q716
MIC
AGC
J701 (1/2)
IC728
TNC
ASIC
TNC
MCU
IC727
EXT.
MIC
INT.
MIC
1200 T-D data
DTMF
TONE
MICM
VOX_IN
IC716
IC737
Main
MCU
E-
Volume
IC721
MOD
TCXO
REF_A
REF_B
MOD
REF_A
TC & REF_B
IC712
IC714
B/2
IC714
A/2
Q712,Q713
D725,D726
DET
D716
SW
IC735
9600 T-D data
CIRCUIT DESCRIPTION

TH-D72A/D72E
11
8. Control System
8-1. RESET, BACKUP circuit
When the supplied +B voltage falls, and the 33M voltage
is detected to be lower than the threshold voltage of the
RESET IC (IC726), the connected Main MCU (IC737) detects
this with the interrupt terminal (/RST), backs up the data to
the EEPROM ICs (IC730,IC731), and turns off the power.
8-2. LCD, LED, KEY circuit
The LCD Display is controlled by the driver built into the
Main MCU (IC737). The contrast is adjusted by the regulator
IC (IC701), similarly controlled by the LCDCNT signal from
the Main MCU (IC737).
On the other hand, the LEDs (D710~715, D718~724) for
the LCD and 16 KEY backlight are lit by the LAMP B power
supply through the DC switches (Q721, Q722). The port of
the Main MCU (IC737) corresponding to the 16 KEY is com-
posed of a 5x5 matrix and detects a pressed KEY by scan-
ning in the software.
8-3. INT-GPS control
The GPS unit installed in the equipment communicates
directly with the Main MCU (IC737) and is controlled. The in-
ternal GPS power supply changes with the DC switch (Q701)
controlled by the Main MCU (IC737).
8-4. RTC function
The RTC IC (IC717) that operates with the lithium battery
has a clock function.
8-5. PC port
It corresponds to the connection to the external instru-
ment (PC) through the USB connector.
8-6. COM port
To correspond to the connection with the external GPS
equipment, it communicates by switching ICs (IC708,
IC709) by the Main MCU (IC737) / TNC MCU (IC727) and
the RS232C driver IC (IC702).
Figure 7 Control circuit
IC702
RS232C
driver
J702 TXD
RXD
COM
port
SW IC
IC709
USB
driver
IC710
V cont
IC701IC703
RESET
IC
IC726
RTC IC
IC717 X701
EEPROM
IC730,IC731
Regulator
IC
Vbus
SW
SW IC
IC708
232B_S
SKY_SW
RXD_COM
TXD_COM
TXD_EGPS
RXD_EGPS
DC
SW DC
SW
Q704
33C
J703
PC
port
IC736
Vbus_USB
LAMP
LCD
LCD
DC
SW
DC
SW
Q722
Q721
LAMP B
Backlight
LED
/RST
RXD_IGPS
TXD_IGPS
GP_ON
GP_PS
VGPS Q701
33C
INT_GPS
33M
IC737
Main
MCU
TNC
MCU
IC727
CIRCUIT DESCRIPTION

TH-D72A/D72E
12
Main MCU: 5F3651TDFC
(TX-RX (Control) unit (A/3) IC737)
Pin No. Port Name I/O Function
1 VREF - Reference voltage
2 AVCC - VCC (3.3V Analog)
3 PKD96M O PKD (9600bps) data mute L: ON
4 BSFT2 O Beat shift for TNC MCU clock
H: ON
5 TNC_CAR O RX carrier signal input (for TNC)
L: ON
6 TONE O Tone output
7 DTMF O DTMF tone output
8 SKY_SW O COM port signal select
L: TNC, H: Main MCU
9 BSFT1 O Beat shift for main MCU clock
H: ON
10 CNT_CLK O Clock for electrical volume IC
11 CNT_DT O Data for electrical volume IC
12 DAC_EN O Enable for electrical volume IC
L: ON
13 BYTE - Not used (GND)
14 CNVSS I Not used
15 PKTBND O TNC input band select
L: Band A, H: Band B
16 VTX O TX power supply control
17 /RST I Reset
18 XOUT O System clock output (11.0592MHz)
19 VSS - GND
20 XIN I System clock input (11.0592MHz)
21 VCC - VCC (3.3V)
22 DAC_RST O Reset for electrical volume IC
23 PKS_IN I PKS for TNC MCU H: TX
24 DC_DET I DC input detection L: ON
25 INT I INT
26 RTS_TNC O RTS for TNC MCU
27 RXD_TNC I RXD for TNC MCU
28 CTS_TNC I CTS for TNC MCU
29 TXD_TNC O TXD for TNC MCU
30 TAB_S O Power supply control for RX
signaling AMP L: ON
31 LCDCNT O LCD contrast adjustment output
L: ON
32 LDA I Lock detection input from PLL (IC431)
H: ON
33 BEEP O Beep output
34 RXD_COM I RXD for COM port
35 TXD_COM O TXD for COM port
36 TXD1 O Not used
Pin No. Port Name I/O Function
37 VCC I VCC (3.3V)
38 RXD1 I Not used
39 VSS - GND
40 33TNC_S O Power supply control for TNC
L: ON
41 SAVE2 O RX audio filter switch H: ON
42 TXD_S O TXD for SUB MCU
43 RXD_S I RXD for SUB MCU
44 RST_S O Reset for SUB MCU L: ON
45 LDB I Lock detection input from PLL (IC513)
H: ON
46 KEY_O1 O Key matrix
47 KEY_O0 O Key matrix
48 KEY_IT I Key matrix
49 KEY_I4 I Key matrix
50 MICB_S O Power supply control for VOX AMP
51 RTC_SDA I/O Data for RTC
52 RTC_SCL O Clock for RTC
53 INTRTC I INT for RTC L: ON
54 KEY_I3 I Key matrix
55 KEY_I2 I Key matrix
56 KEY_I1 I Key matrix
57 KEY_I0 I Key matrix
58 32K_SW O Clock output control for RTC H: ON
59 KEY_O4 O Key matrix
60 KEY_O3 O Key matrix
61 KEY_O2 O Key matrix
62 LAMP O Back light control H: ON
63 C_S O Power supply control for 33C and
47C H: ON
64 GP_ON O Always Low
65 TXD_IGPS O TXD for GPS module
66 RXD_IGPS I RXD for GPS module
67 GP_PS O Power save control for GPS module
68 VGPS O Power supply control for GPS
module L: ON
69 /LCD_RST O Reset for LCD
70 /LCD_CS O Not used
71 /LCD_WR O W/R for LCD
72 A[0] O Data for LCD
73 D[7] O Data for LCD
74 D[6] O Data for LCD
75 D[5] O Data for LCD
76 D[4] O Data for LCD
77 D[3] O Data for LCD
SEMICONDUCTOR DATA

TH-D72A/D72E
13
Pin No. Port Name I/O Function
78 D[2] O Data for LCD
79 D[1] O Data for LCD
80 E2PCS2 O Chip select for EEPROM (IC731)
81 E2PCL O Clock for EEPROM
82 E2PSI O Data input for EEPROM
83 E2PSO I Data output for EEPROM
84 E2PCS O Chip select for EEPROM (IC730)
85 VCC - VCC 3.3V
86 D[0] O Data for LCD
87 VSS - GND
88 RLEDA O BUSY LED control for band A
89 TLEDA O TX LED control for band A
90 RLEDB O BUSY LED control for band B
91 TLEDB O TX LED control for band B
92 232B_S O Power supply control for RS-232C
driver L: ON
93 AFM O AF mute control L: ON
94 SPM O SP mute control H: ON
95 MICM O MIC mute control L: ON
96 ENC1 I Encoder input 1
97 ENC2 I Encoder input 2
98 PSW I Power switch input
99 Vbus_USB O Power supply control for USB driver
H: ON
100 TXD_USB O TXD for USB driver IC
101 RXD_USB I RXD for USB driver IC
102 CTS_USB I CTS for USB driver IC
103 RTS_USB O RTS for USB driver IC
104 /SUSPEND I USB suspend
105 RST_USB I/O Reset for USB driver IC
106 MAIN_WR I Programming mode select
107 CHG_TH I Thermal detect from charge
108 BV I Voltage detection
109 SET I Set detection
110 PTT I PTT key input
111 AFB_S O Power supply control for AF AMP
112 SQ O Busy detect output
113 Vbus_DET I USB connect detection
114 TNC_WR O Programming mode select
115 GPSLED I GPS position aquisition status
116 CON I TNC connect flag input
117 TNC_RST O Reset for TNC MCU
118 STA I STA for TNC MCU
119 S9600 I 9600/1200 bps select
SEMICONDUCTOR DATA
Pin No. Port Name I/O Function
120 REM I Remote voltage input
121 VOX_IN I VOX level detection
122 SQA I SQ level A/D input band A
123 SMA I Signal level A/D input band A
124 SMB I Signal level A/D input band B
125 SQB I SQ level A/D input band B
126 WXCTIN_B I CTCSS/DCS/WX decode band B
127 AVSS - GND
128 WXCTIN_A I CTCSS/DCS/WX decode band A
Sub MCU: 78F0515AGKDXA
(TX-RX (TX-RX) unit (C/3) IC611)
Pin No. Port Name I/O Function
1 DC_S O Output voltage select for DC/DC
converter L: TX ON
2 UAIP O AIP control for UHF L: ON
3 VAIP O AIP control for VHF L: ON
4 45RVAM_S O RX AM power supply control L: ON
5 SGL_B O VCO power supply control for band
B L: ON
6 45RUA_S O RX UHF power supply control for
band A H: ON
7 33RB_S O RX IF power supply control for band
B L: ON
8 PRE_CHG O Charging current control
H: Normal, L: Precharge
9 45RVB_S O RX VHF power supply control for
band B H: ON
10 45RVA_S O RX VHF power supply control for
band A H: ON
11 45RUB_S O RX UHF power supply control for
band B H: ON
12 OCD1B I Not used
13 OCD1A I Not used
14 LE_B I LE output for PLL IC (IC513)
H: Lock
15 CHG O Charging control H: ON
16 SAVE1 O Save switch L: Save ON
17 BTV_ON O Battery voltage detection switch
H: ON
18 RXD6 I Not used
19 TXD6 I Not used
20 APCSW O APC discharge switch H: ON
21 TXD_S O Main MCU TXD
22 RXD_S I Main MCU RXD
23 AVREF - Reference voltage (3.3V)

TH-D72A/D72E
14
SEMICONDUCTOR DATA
Pin No. Port Name I/O Function
24 AVSS - GND
25 NC - Not used
26 BT_V I Battery voltage detection
27 CHGEND I Battery charging current detection
28 FTH I Thermal detect from charge
29 430TX_S O UHF TX power supply control
H: ON
30 VHF_B O VCO power supply control for band
B L: VHF, H; UHF
31 144TX_S O VHF TX power supply control
H: ON
32 SHIFT_B O VCO shift switch for band B
33 PS_B O PLL power supply control for IC513
H: ON
34 PS_A O PLL power supply control for IC431
H: ON
35 TR_DATA O Data output for PLL
36 INTS I INT
37 B_S O Power supply control for 33CB
L: ON
38 A_S O Power supply control for 33CA
L: ON
39 TR_CLOCK O Clock output for PLL
40 RST I Reset
41 LE_A O LE output for PLL IC (IC431)
42 XT1 O Beat shift control H: ON
43 FLMDO - Not used
44 SCLK - System clock (11.0592MHz)
45 XOUT - System clock output (11.0592MHz)
46 REGC - Bypass condenser
47 VSS - GND
48 VDD - VDD 3.3V
TNC MCU: 5F364AMDFB
(TX-RX (Control) unit (A/3) IC727)
Pin No. Port Name I/O Function
1~3 NC - Not used
4 SIN I Data input
5 SCLKR I Clock input
6 BYTE I Data bus select
7 CNVSS I Not used
8 NC - Not used
9 STA O Data status
10 RESET I TNC reset
11 Xout - System clock output (15.9744MHz)
Pin No. Port Name I/O Function
12 Vss - GND
13 Xin - System clock input (15.9744MHz)
14 VCC1 - VCC1(3.3V)
15,16 NC - Not used
17 SCLKT I TX data clock input (for TNC ASIC)
18 SCLKR I RX data clock input (for TNC ASIC)
19 CON O TNC connect signal output
20 P80 I Pull down
21,22 NC - Not used
23 GPSLED O EXT GPS LED output H: Active
24 NC - Not used
25 CTS_TNC I CTS (for main MCU)
26 RTS_TNC O RTS (for main MCU)
27 TXD_TNC I TXD (for main MCU)
28 RXD_TNC O RXD (for main MCU)
29~32 P67~P64 I Not used
33 TXD_EGPS O EXT GPS TXD (COM port)
34 RXD_EGPS I EXT GPS RXD (COM port)
35,36 NC - Not used
37 CLKOUT O Clock output (15.9744MHz)
38 NC - Not used
39 P55 I Not used
40~43 NC - Not used
44 P50 I Not used
45 SQ I Squelch signal input L: Signal ON
46 TNC_CAR I RX carrier signal input (for TNC ASIC)
L: Carrier ON
47 PLLLOCK I PLL lock signal input (for TNC ASIC)
48 FLAG I Flag signal input (for TNC ASIC)
49 TTX O TX/RX select (for TNC ASIC)
H: TX, L: RX
50 S9600 O 9600/1200 bps select (for TNC ASIC)
H: 9600bps, L:1200bps
51 LOOP O Loop back test output (for TNC ASIC)
52 PLLCNT O PLL lock speed control output
(for TNC ASIC)
53~59 NC - Not used
60 VCC2 - VCC2 (3.3V)
61 NC - Not used
62 VSS2 - GND
63,64 NC - Not used
65 TNC_WR I Not used
66 P24 I Pull up
67 P23 I Pull down
68 P22 I Pull up

TH-D72A/D72E
15
SEMICONDUCTOR DATA
Pin No. Port Name I/O Function
69 P21 I Pull down
70 P20 I Pull down
71~91 NC - Not used
92 P102 O Pull down
93 NC - Not used
94 AVSS - GND
95 PKS_IN O TNC TX/RX output H: TX, L: RX
96 VREF - VREF (GND)
97 AVCC - VCC (analog 3.3V)
98 NC - Not used
99 SRX O RXD (for TNC ASIC)
100 SCLK I Clock (for TNC ASIC)
Electrical Volume IC: AK2330
(TX-RX (Control) unit (A/3) IC721)
Pin No. Pin Name Function
1 Vin7 Band B TCXO control input
2 Vin0 TX deviation adjustment input
3 Vout0 TX deviation adjustment output for VCO
4 Vout1 TX deviation adjustment output for TCXO
Pin No. Pin Name Function
5 Vin1 TX deviation adjustment input
6 RSTN Reset
7 CSN Chip select
8 SCLK Clock
9 SDATA Data
10 DVdd Vdd (3.3V Digital)
11 Vss GND
12 Avdd Vdd (3.3V Analog)
13 Vref Reference voltage input
14 Vin2 Band A RX signal input
15 Vout2 Band A RX signal output
16 Vout3 Band B RX signal output
17 Vin3 Band B RX signal input
18 Vin4 BPF and APC adjustment voltage input for
band B
19 Vout4 BPF and APC adjustment voltage output
for band B
20 Vout5 BPF adjustment voltage output for band A
21 Vin5 BPF adjustment voltage input for band A
22 Vin6 Band A TCXO control input
23 Vout6 Band A TCXO control output
24 Vout7 Band B TCXO control output

TH-D72A/D72E
16
TX-RX unit (X57-784X-XX)
Ref. No. Use/Function Operation/Condition/Compatibility
IC201 OP AMP APC
IC202 RF AMP TX AMP
IC203 OP AMP APC
IC351 OP AMP AM AGC
IC352 Analog switch AM/FM select
IC353 FM system Band A
IC354 FM system Band B
IC431 PLL system Band A
IC512 DC/DC converter Charge pump for PLL
IC513 PLL system Band B
IC514 5.3V AVR Charge pump
IC611 SUB MCU MCU
IC639 Voltage detector 10V for DC/DC converter
IC641 Charge Li-ion battery
IC642 OP AMP Charge voltage/current detect
IC643 1.5V AVR Charge
IC644 DC/DC converter +B
IC645 4.5V AVR 45C
IC646 3.3V AVR 33CS
IC701 OP AMP LCD
IC702 RS-232C driver RS-232C COM port
IC703 DC/DC converter LCD
IC705 AVR AFB
IC708,709 Analog switch MCU/TNC
IC710 USB driver USB
IC712 OP AMP MIC AMP
IC713 Voltage detector INT
IC714 OP AMP VOX AMP
IC715 3.3V AVR 33M
IC716 OP AMP MIC limiter AMP
IC717 RTC Real-time clock
IC718 3.3V AVR 33C
IC719 4.7V AVR 47C
IC720 Analog switch RX band A/B
IC721 D/A converter Signal level adjust
IC722 OP AMP RX signaling
IC724 Flip-Flops DIVIDER
IC725 Comparator A/D converter for TNC signal
IC726 Voltage detector Reset
IC727 MCU TNC
IC728 ASIC TNC MODEM
IC730 EEPROM Main memory
Ref. No. Use/Function Operation/Condition/Compatibility
IC731 EEPROM GPS log memory
IC732 Comparator A/D converter for TNC signal
IC733 OP AMP TNC signal
IC734 AF power AMP SP output
IC735 Analog switch 9600bps mute
IC736 3.3V AVR USB IC
IC737 MCU Main
Q1 1st mixer UHF band B
Q2 1st mixer VHF band A
Q3 1st mixer UHF band A
Q4 1st mixer VHF band B
Q5 RF AMP UHF band B
Q6 RF AMP UHF band A
Q7 RF AMP VHF band A
Q8 RF AMP VHF band B
Q9 RF AMP UHF band B
Q10 RF AMP UHF band A
Q11 RF AMP VHF band A
Q12 Switch UHF AIP
Q13 RF AMP VHF band B
Q14 Switch UHF AIP
Q15,16 Switch VHF AIP
Q201,204 RF AMP Buffer
Q205 Switch APC
Q207 AMP APC
Q208 DC switch 144T
Q209 DC switch 430T
Q210,211 DC switch 45TX
Q212 DC switch APC
Q214 RF AMP TX drive AMP
Q215 RF AMP TX final AMP
Q352 AMP AM
Q353 Switch AM AGC
Q354 AMP AM
Q355 Switch AM AGC
Q356 AMP AM
Q357 RF AMP 2nd local AMP
Q358 IF AMP Band A
Q359 IF AMP Band B
Q433 AMP Ripple filter
Q434 RF AMP Band A PLL
Q435 Oscillator Band A VCO
Q436~438 RF AMP Buffer
COMPONENTS DESCRIPTION

TH-D72A/D72E
17
Ref. No. Use/Function Operation/Condition/Compatibility
Q512 AMP Ripple filter
Q518 Switch VCO shift
Q521 RF AMP Band B PLL
Q522,523 Oscillator Band B VCO
Q524 RF AMP Buffer
Q611 DC switch 45RUB
Q612,613 DC switch 45RVA
Q614 DC switch 45RVB
Q615 DC switch 45RVAM
Q616 DC switch 33RB
Q642 Switch DC DET
Q643 AMP Li-ion battery charge
Q644 DC switch Band B VCO
Q645 Switch Over voltage protector
Q646,648 Switch Li-ion battery charge
Q649 Switch Over voltage protector
Q650 Switch DC/DC converter
Q651 DC switch 33CS
Q652 DC switch 45C
Q653 Switch Li-ion battery charge
Q654 DC switch 33CB
Q655 AVR 33C
Q656 AVR 45C
Q657 DC switch 33CA
Q658 AVR 45C
Q659 AVR 33C
Q660 DC switch Band B PLL
Q661 DC switch Band B VCO
Q662 Switch Charge voltage detect
Q663 Switch DC/DC converter
Q664 Switch Beat shift
Q701 DC switch 33GP
Q702,703 Switch SP mute
Q704 DC switch RS-232C
Q707 DC switch MIC AMP
Q708 DC switch T/R LED band B
Q709 Switch RX signal
Q710 DC switch T/R LED band A
Q711 Switch AF mute
Q712,713 AMP MIC AGC
Q714 Switch MIC mute
Q715 AMP RX signal
Q716 Switch MIC mute
Ref. No. Use/Function Operation/Condition/Compatibility
Q717,718 AMP RX signal
Q719 Switch IDC
Q720 Switch TAB
Q721,722 AVR Lamp
Q723,724 Switch Beat shift
Q725 Switch 33TNC
Q726~729 AMP TNC
Q730 Switch GPS
D5 RF switch VHF band B 1st local
D6 RF switch VHF band A 1st local
D7 RF switch UHF band B 1st local
D8,9 BPF tuning UHF band B
D10,11 BPF tuning UHF band A
D12,13 BPF tuning VHF band A
D14,15 BPF tuning VHF band B
D16,17 BPF tuning UHF band B
D18,19 BPF tuning UHF band A
D20,21 BPF tuning UHF band B
D22,23 BPF tuning UHF band A
D24,25 BPF tuning VHF band A
D26,27 BPF tuning VHF band B
D28,29 BPF tuning UHF band B
D30,31 BPF tuning UHF band A
D32,33 BPF tuning VHF band A
D35,36 BPF tuning VHF band B
D38 BPF tuning UHF band B
D39 BPF tuning UHF band A
D40 BPF tuning UHF band B
D41 BPF tuning UHF band A
D42,43 BPF tuning VHF band A
D44,45 BPF tuning VHF band B
D201 RF switch UHF TX
D202 RF switch VHF TX
D203 RF switch RX band B
D204 RF switch UHF TX
D205 RF switch VHF TX
D209 Reverse current
protector APC
D210 Constant voltage APC
D211 RF switch VHF TX
D212,214 RF switch UHF TX
D215,216 RF switch VHF TX
D217 RF switch UHF TX
COMPONENTS DESCRIPTION

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 filter
D437 RF switch UHF band A 1st local
D511 Speed up DC/DC converter
D513 Speed up Ripple filter
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

TH-D72A/D72E
19
TX-RX unit (X57-784X-XX) (C/3, A/3)
: TX-RX, Control
CN611
Pin No.
CN731
Pin No. Name Function
CN611 – CN731 (TX-RX to Control)
1 26 C_S Unit power supply control
2 25 GND GND
3 24 RXD_S RXD for Sub MCU control
4 23 TXD_S TXD for Sub MCU control
5 22 DC_DET DC input detection
6 21 VTX 4.5V TX power supply control
7 20 MOD Modulation signal
8 19 REF_A VC control for TCXO (X431)
9 18 LDB Unlock detection input from PLL
(IC513)
10 17 DET_B Band B RX detect signal
11 16 SQB Band B squelch voltage
12 15 SMB Band B RSSI voltage
13 14 BPFA Band A BPF tuning voltage
14 13 APC&BPFB Band B BPF tuning/APC voltage
15 12 SMA Band A RSSI voltage
16 11 SQA Band A squelch voltage
17 10 DET_A Band A RX detect signal
18 9 LDA Unlock detection input from PLL
(IC431)
19 8 TC&REF_B VC control for TCXO (X511)
20 7 RST_S Reset for sub MCU
21 6 B +B power supply
22 5 B +B power supply
23 4 B +B power supply
24 3 NC Not used
25 2 GND GND
26 1 NC Not used
Pin No. Pin Name I/O Function
10 D[5] O Data output
11 D[6] O Data output
12 D[7] O Data output
13 VDD O Power supply (3.3V)
14 VSS O GND
15 VDD O Power supply (3.3V)
16 V1 I Power supply V1
17 V2 I Power supply V2
18 V3 I Power supply V3
19 V4 I Power supply V4
20 V5 O Power supply V5
CN715 (to FPC ASSY)
1 KEY_O3 O Key matrix
2 KEY_O2 O Key matrix
3 KEY_O0 O Key matrix
4 KEY_I4 I Key matrix
5 KEY_O1 O Key matrix
6 SPI O SP AF output
7 SPG O SP GND
8 MICG I MIC GND
9 MICI I MIC audio input
10 PSW I Power key
11 GND - GND
12 LAMP B O Back light power supply
13 KEY_I2 I Key matrix
14 KEY_I3 I Key matrix
15 KEY_O4 I Key matrix
CN719 (to PTT section)
1 PTT I PTT KEY
2 GND - GND
3 KEY_I0 I Key matrix
4 KEY_O4 O Key matrix
5 KEY_I1 I Key matrix
6 CHG_TH I Thermal detect for charge
J702 (EXT. COM Port)
1 TXD O TXD for RS-232C
2 RXD I RXD for RS-232C
3 GND - GND
J703 (EXT. USB Port)
1 V BUS I Power supply from PC
2 D– I/O 12Mbps data (full speed)
3 D+ I/O 12Mbps data (full speed)
4 NC - Not used
5 GND - GND
TERMINAL FUNCTION

TH-D72A/D72E
20
PARTS LIST
Chip capacitor
Code L W T
Empty 5.6±0.5 5.0±0.5 Less than 2.0
A 4.5±0.5 3.2±0.4 Less than 2.0
B 4.5±0.5 2.0±0.3 Less than 2.0
C 4.5±0.5 1.25±0.2 Less than 1.25
D 3.2±0.4 2.5±0.3 Less than 1.5
E 3.2±0.2 1.6±0.2 Less than 1.25
F 2.0±0.3 1.25±0.2 Less than 1.25
G 1.6±0.2 0.8±0.2 Less than 1.0
H 1.0±0.05 0.5±0.05 0.5±0.05
Chip resistor
Code L W T
E 3.2±0.2 1.6±0.2 1.0
F 2.0±0.3 1.25±0.2 1.0
G 1.6±0.2 0.8±0.2 0.5±0.1
H 1.0±0.05 0.5±0.05 0.35±0.05
s2ATINGWATTAGE
Code Wattage Code Wattage Code Wattage
1J 1/16W 2C 1/6W 3A 1W
2A 1/10W 2E 1/4W 3D 2W
2B 1/8W 2H 1/2W
,ESSTHANP&
Code B C D F G
(pF) ±0.1 ±0.25 ±0.5 ±1 ±2
#!0!#)4/23
C C 4 5 T H 1 H 2 2 0 J
1 2 3 4 5 6
1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating
2 = Shape ... round, square, etc. 5 = Value
3 = Temp. coefficient 6 = Tolerance
s4EMPERATURECOEFFICIENT
1st Word C L P R S T U
Color* Black Red Orange Yellow Green Blue Violet
ppm/°C 0 –80 –150 –220 –330 –470 –750
s4OLERANCE-ORETHANP&
Code C D G J K M X Z P No code
(%) ±0.25 ±0.5 ±2 ±5 ±10 ±20 +40 +80 +100 More than 10μF : –10~+50
–20 –20 –0 Less than 4.7μF : –10~+75
s6OLTAGERATING
2nd word A B C D E F G H J K V
1st word
0 1.0 1.25 1.6 2.0 2.5 3.15 4.0 5.0 6.3 8.0 –
1 10 12.5 16 20 25 31.5 40 50 63 80 35
2 100 125 160 200 250 315 400 500 630 800 –
3 1000 1250 1600 2000 2500 2150 4000 5000 6300 8000 –
s#HIPCAPACITORS
(EX) C C 7 3 F S L 1 H 0 0 0 J Refer to the table above.
1 2 3 4 5 6 7 1 = Type
(Chip) (CH, RH, UJ, SL) 2 = Shape
3 = Dimension
(EX) C K 7 3 F F 1 H 0 0 0 Z 4 = Temp. coefficient
1 2 3 4 5 6 7 5 = Voltage rating
(Chip) (B, F) 6 = Value
7 = Tolerance
2%3)34/23
s#HIPRESISTOR#ARBON
(EX) R D 7 3 E B 2 B 0 0 0 J
1 2 3 4 5 6 7
(Chip) (B, F)
s#ARBONRESISTOR.ORMALTYPE
(EX) R D 1 4 B B 2 C 0 0 0 J
1 2 3 4 5 6 7
1 = Type 5 = Rating wattage
2 = Shape 6 = Value
3 = Dimension 7 = Tolerance
4 = Temp. coefficient
CC45 Color*
2nd Word G H J K L
ppm/°C ±30 ±60 ±120 ±250 ±500
Example : CC45TH = –470±60ppm/°C
s#APACITORVALUE
010 = 1pF 2 2 0 = 22pF
100 = 10pF
101 = 100pF Multiplier
102 = 1000pF = 0.001μF 2nd number
103 = 0.01μF 1st number
L
W
T
s$IMENSION