Kenwood TM-V71A User manual

SERVICE MANUAL
144/430 (440) MHz FM DUAL BANDER
TM-V71A/V71E
© 2007-5 PRINTED IN JAPAN
B51-8791-00 (N)289
This product uses Lead Free solder.This product complies with the RoHS directive for the European market.
Photo is TM-V71A.
CONTENTS
DISASSEMBLY FOR REPAIR ......................2
CIRCUIT DESCRIPTION ..............................3
SEMICONDUCTOR DATA.........................11
COMPONENTS DESCRIPTION.................14
TERMINAL FUNCTION .............................19
PARTS LIST ...............................................22
EXPLODED VIEW ......................................38
PACKING....................................................39
ADJUSTMENT ..........................................40
PC BOARD
DISPLAY UNIT (X54-3590-00)...............60
TX-RX UNIT (X57-731X-XX) .................64
INTERCONNECTION DIAGRAM ..............72
SCHEMATIC DIAGRAM ............................74
BLOCK DIAGRAM .....................................86
LEVEL DIAGRAM ......................................88
OPTIONAL ACCESSORIES .......................90
SPECIFICATIONS ......................................91
Microhone
(T91-0657-15)
Metallic cabinet
(A01-2206-02)
Front glass (Display)
(B10-2775-12)
Panel (Display)
(A62-1135-03)
Knob (ENC)
(K29-9376-03)
Knob (VOL)
(K29-9377-03) x 2
Knob (SQL)
(K29-9380-03) x 2
Button knob (VFO,MR)
(K29-9378-03)
Button knob (POWER,PM)
(K29-9379-03)
Button knob (7KEYS)
(K29-9381-02)

TM-V71A/V71E
2
Document Copyrights
Copyright 2007 by Kenwood Corporation. All rights
reserved.
No part of this manual may be reproduced, translated,
distributed, or transmitted in any form or by any means,
electronic, mechanical, photocopying, recording, or
otherwise, 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
errors or omissions. Neither is any liability assumed for
damages 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.
DISASSEMBLY FOR REPAIR
Precautions for Disassembly
When removing the rear case from the panel, open the
bottom side slowly so as not to stress the FPC, as the FPC
on the rear case is connected with the connector of the
display PCB.
Display PCB
FPC
Panel
Rear case

TM-V71A/V71E
3
1. Frequency Configuration
The TM-V71A/V71E has an individual VCO and PLL unit
for both band A and band B. Using these separate VCO and
PLL circuits, it can receive 2 separate bands at the same
time. You can also perform full-duplex operation.
The band A VCO is used for the following functions:
(i) VHF/UHF transmission
(ii) The first local oscillator for the band A (VHF)
reception.
(iii) The first local oscillator for the band A (UHF)
reception.
The band B VCO is used for the following functions:
(i) VHF/UHF transmission
(ii) The first local oscillator for the band B (VHF)
reception.
(iii) The first local oscillator for the band B (UHF)
reception.
The PLL reference frequency is generated by a 12.8MHz
(band A) and a 16.8MHz (band B) crystal oscillator connected
to the band A and band B PLL ICs. This reference frequency
is used for both PLL circuits. The 45.505MHz second local
oscillator for band A is generated by the FM IC crystal
oscillator circuit. The second local oscillator for the band B
uses the tripled 16.8MHz reference oscillator frequency.
Note:
The PCB layout and the mounting parts are the same for the
band A VCO (X57-731 B/6) and band B VCO (X57-731 C/6),
although the PCB silk print is different.
AF
AMP
TCXO
16.8MHz
PLL B
MIC
AMP
VCO B
MCF
49.95MHz
2dn IF
450kHz
DET
x3
FM IC
50.4MHz
TCXO
12.8MHz Band A
VHF RX
VHF TX
PLL A VCO A
MCF
45.05MHz
2dn IF
455kHz
DET
FM IC
45.505MHz
1st IF
45.05MHz
1st IF
49.95MHz
CA
A
Band A
UHF RX
DB
B
Band B
VHF RX
UHF TX
EA
Band B
UHF RX
FB
MIC
SP
ANT
Fig. 1 Frequency configuration
K type E type M4 type
A 144.000 ~147.995MHz 144.000~145.995MHz 144.000~145.995MHz
B 438.000~449.995MHz 430.000~439.995MHz 430.000~439.995MHz
C 189.050~193.045MHz 189.050~191.045MHz 189.050~191.045MHz
D 392.950~404.945MHz 384.950~394.945MHz 384.950~394.945MHz
E 193.950~197.945MHz 193.950~195.945MHz 193.950~195.945MHz
F 388.050~400.045MHz 380.050~390.045MHz 380.050~390.045MHz
CIRCUIT DESCRIPTION

TM-V71A/V71E
4
2. Receiver System
2-1. Band A VHF Receiver Circuit
The incoming signal from the antenna passes through
a filter circuit and goes to the RF amplifier (Q228). The
amplified signal enters the band-pass filter. After the signal
passes through the band-pass filter, it is amplified by another
RF amplifier (Q227) and then passes through the band-
pass filter before entering the mixer (Q226). The frequency
of the signal is converted by the first local oscillator (Upper
heterodyne) to generate a 45.05MHz first IF signal. The
signal passes through the MCF (XF486), is amplified by the
IF amplifier (Q495) and then enters the FM IC (IC486).
The signal is converted to the 455kHz second IF signal
by the second local oscillator (Upper heterodyne). It is then
detected to generate an audio signal.
2-2. Band B VHF Receiver Circuit
The incoming signal from the antenna passes through
a filter circuit and goes to the RF amplifier (Q293). The
amplified signal passes through the band-pass filter and is
amplified by another RF amplifier (Q292). It then passes
through the band-pass filter and goes to the mixer (Q291).
The frequency of the signal is converted by the first local
oscillator (Upper heterodyne) to generate a 49.95MHz first
IF signal. The signal passes through the MCF (XF546), is
amplified by the IF amplifier (Q551) and then enters the
FM IC (IC546). The signal is then converted to the 450kHz
second IF signal by the second local oscillator, which is
tripled 16.8MHz (Upper heterodyne). It is then detected to
generate an audio signal.
Fig. 2 Band A and Band B VHF receiver circuit
ANT
SW
D/A
AIP
SW
D134,135
D186,188
LPF
RF AMP
Q228
RF AMP
Q227
IF AMP
Q495
X486
45.505MHz
MIXER
Q226
MCF
XF486
CF
Wide
IC576
Q229
BPF
D241~243
L248,249,258
BPF
D238~240
L245,257
BPF
D232~234
L232,236,250
BPF
D229~231
L232,233,260
CF
Narrow
IC667
SW
IC576
MPU
IC918
FM IC
IC486
1st Local OSC
Band A
Band B
2nd Local OSC
Band A
AF
D/A
AIP
SW
RF AMP
Q293
RF AMP
Q292
IF AMP
Q551
MIXER
Q291
MCF
XF546
CF
Wide
IC576
Q294
BPF
D306~308
L312~314
BPF
D303~305
L309,310,322
BPF
D297~299
L301,302,323
BPF
D294~296
L297,298,324
CF
Narrow
IC667
SW
IC577
MPU
IC918
FM IC
IC546
1st Local OSC
2nd Local OSC
Band B
AF
45.05MHz
49.95MHz
TCXO
X66
Tripler
x3
16.8MHz Q547
2-3. Band A UHF Receiver Circuit
The incoming signal from the antenna passes through
a filter circuit and goes to the RF amplifier (Q363). The
amplified signal enters the band-pass filter. After the
signal passes through the band-pass filter, it is amplified
by another RF amplifier (Q362) and then passes through
the band-pass filter before entering the mixer (Q361).
The frequency of the signal is converted by the first local
oscillator (Lower heterodyne) to generate a 45.05MHz first
IF signal. The signal passes through the MCF (XF486), is
amplified by the IF amplifier (Q495) and then enters the FM
IC (IC486). The signal is converted to the 455kHz second IF
signal by the second local oscillator (Upper heterodyne). It is
then detected to generate an audio signal.
2-4. Band B UHF Receiver Circuit
The incoming signal from the antenna passes through
a filter circuit and goes to the RF amplifier (Q408). The
amplified signal passes through the band-pass filter and is
amplified by another RF amplifier (Q407). It then passes
through the band-pass filter and goes to the mixer (Q406).
The frequency of the signal is converted by the first local
oscillator (Lower heterodyne) to generate a 49.95MHz first
IF signal. The signal passes through the MCF (XF546), is
amplified by the IF amplifier (Q551) and then enters the
FM IC (IC546). The signal is then converted to the 450kHz
second IF signal by the second local oscillator, which is
tripled 16.8MHz (Upper heterodyne). It is then detected to
generate an audio signal.
The VHF/ UHF band-pass filter is tuned to the desired
frequency according to the BPF voltage output from the D/A
IC (IC667), and is controlled by the MPU (IC918) and the
varicap.
CIRCUIT DESCRIPTION

TM-V71A/V71E
5
2-5. Audio Circuit
The detected band A audio signal is amplified by Q810
and de-emphasized by Q806. The band B audio signal is
amplified by Q811 and de-emphasized by Q807. One of
these audio signals is selected with a cross point switch
(IC806). The signal passes through the electronic volume
ANT
SW
D/A
AIP
SW
D164,165
D187,189
LPF
RF AMP
Q363
RF AMP
Q362
IF AMP
Q495
X486
45.505MHz
MIXER
Q361
MCF
XF486
CF
Wide
IC576
Q400
BPF
D378,379
L377
BPF
D375,376
L375
BPF
D370,371
L370
BPF
D364,365
L366
BPF
D367,368
L368
CF
Narrow
IC667
MPU
IC918
FM IC
IC486
1st Local OSC
Band A
Band B
2nd Local OSC
Band A
AF
2nd Local OSC
45.05MHz
D/A
AIP
SW
RF AMP
Q408
RF AMP
Q407
IF AMP
Q551
MIXER
Q406
MCF
XF546
CF
Wide
IC576
Q450
BPF
D423,424
L422
BPF
D420,421
L420
BPF
D415,416
L415
BPF
D409,410
L411
BPF
D412,413
L413
CF
Narrow
IC667
MPU
IC918
FM IC
IC546
1st Local OSC
Band B
AF
49.95MHz
TCXO
X66
Tripler
x3
16.8MHz Q547
Fig. 3 Band A and Band B UHF receiver circuit
Q807 Q811
IC805
1/2
IC805
1/2
DE-EMPHASIS B
Q806
Q804 Q803
Q810
DE-EMPHASIS A
IC918
MPU
CTCSS Filter AMP
BEEP
DTMF
IC806
Cross
Point
SW
IC804
E VR
MUTE1
MUTE2
ATT
IC801
AF AMP
J801
(SP1)
J802
(SP2)
IC666
Multi
SW
IC486
FM IC (A)
IC546
FM IC (B)
Q816
Fig. 4 Audio circuit
(IC804), is amplified by the AF amplifier (IC801), and is then
fed to the speaker or the external speaker jack.
CTCSS and DCS signals that pass through the filter
circuit (IC805) go to the MPU (IC918) for CTCSS and DCS
decoding.
3. Transmitter System
3-1. Modulation Circuit
The audio modulation input from the microphone is
amplified by IC802. After the DTMF signal and 1750Hz tone
signal generated by the MPU are switched with IC806, they
are mixed by IC803. After the signal amplified by IC802
is switched by IC806, it is amplifier by IC803. The signal
is then pre-emphasized by Q805 and Q808, and its level
is adjusted by IC804. The resulting signal goes to each of
the band A and band B VCOs as a modulation signal. The
TONE/ DCS signal generated by the MPU is fed to IC803.
The signal amplified by IC803 is distributed and the level is
adjusted by IC804. The modulating signal goes to each of
the band A and band B VCOs and the reference oscillation
circuit.
CIRCUIT DESCRIPTION

TM-V71A/V71E
6
3-2. Transmitter Circuit
The VHF VCO output is amplified by RF amplifier (Q644)
and driver amplifier (Q131). It is further amplified to the final
output by power module (IC131). The output signal passes
through antenna switch (D134, D135) and a low-pass filter,
and is then fed to the antenna.
The UHF VCO output is amplified by RF amplifier (Q161)
and driver amplifier (Q162). It is further amplified to the final
output by power module (IC161). The signal passes through
antenna switch (D164, D165), and a low-pass and high-pass
filter, and is then fed to the antenna.
IC802
1/2 Q805
Q801
Q808
PRE-EMPHASIS
IC806
Cross
Point
SW
MIC AMP
IC802
1/2
IC803
1/2
ALC AMP
IC803
2/2
MOD AMP
X1
TCXO (A)
X66
TCXO (B)
VCO (A)
VCO (B)
IC804
E VR IC807
MIC
ALC
MUTE TONE/DCSDTMF
1750Hz
Fig. 5 Modulation circuit
Q644
RF AMP
Q7
LOCAL
AMP
Q131
DRIVE
AMP IC131
VHF
Power
AMP
VCO
A
LPF
Q161
RF AMP
Q72
LOCAL
AMP
Q162
DRIVE
AMP IC161
UHF
Power
AMP
VCO
B
LPF HPF
ANT
Fig. 6 Transmitter circuit
3-3. APC Circuit
The Automatic transmission Power Control (APC) circuit
has a differential amplifier (IC187) that compares the DC
voltage generated by detecting part of the transmission
output using diodes (D191, D192) with the reference
voltage output from the D/A IC (IC667). The output signal is
switched by IC186 and is fed to the power module of each
VHF/UHF to keep transmission output constant.
Fig. 7 APC circuit
IC131
VHF
Power
AMP
LPF
IC161
UHF
Power
AMP
LPF HPF
ANT
Reverse
Forward D192
D191
OP AMP
IC187
Analog SW
IC186
APC V
APC U
D/A
IC667
REV REFFWR REF
VSF
to MPU
CIRCUIT DESCRIPTION

TM-V71A/V71E
7
3-4. Overheating Protection Circuit
To protect thermal destruction of the power modules
(IC131, IC161), the voltage of the thermistors (TH131,
TH161) near the power modules (IC131, IC161) is monitored
by the MPU (IC918). If their temperature becomes high,
this circuit reduces the APC voltage to cool down the
temperature.
4. PLL Circuit
4-1. Reference Oscillator Circuit
Band A divides 12.8MHz inside the PLL IC (IC1) or band
B divides 16.8MHz inside the PLL IC (IC66) to generate a
5kHz or 6.25kHz reference frequency. The 16.8MHz signal
on IC66 side is tripled by Q547 to obtain the second local
oscillator for band B. The reference oscillation circuit is also
modulated to improve the modulation characteristics of the
DCS and 9600bps packet signal when it is transmitted.
4-2. Phase Comparator
Part of the band A VCO output is amplified by Q5 and
goes to PLL IC (IC1). Also, a part of the band B VCO output
is amplified by Q70 and goes to the PLL IC (IC66). The
pulse-swallow type PLL IC divides the input VCO oscillator
frequency using the data from the MPU (IC918). It compares
its phase with that of the reference frequency to make the
PLL synthesizer to generate the desired step.
4-3. Lock Voltage (VCO Control Voltage)
The phase differential comparator, output from the PLL
IC, results in a phase difference pulse. As for the result of
phase comparison with the PLL IC, a phase difference is
output as a pulse. This pulse is amplified by a charge pump
(Q2, Q3 or Q67, Q68) and the ripples are removed by a
low-pass filter, then the signal is supplied as the oscillator
frequency control voltage for each VCO.
4-4. Unlock Detection Circuit
When the PLL is unlocked, a low state voltage is output
from the LD terminal (pin 8) of the PLL IC. This signal is
monitored by the MPU (IC918) to control transmission/
reception switching timing.
Fig. 8 PLL circuit
12.8MHz
TCXO
LPF LPF
PLL IC
IC1
VCO
A
Q2
Q3
Q7
Q5
TCXO A
Mod Signal
X1
LOCAL
VCO A
Mod Signal
Charge Pump
Band A
16.8MHz
TCXO
LPF LPF
PLL IC
IC66
Tripler
x3
VCO
B
Q67
Q68
Q72
Q70
TCXO B
Mod Signal
X66
LOCAL
VCO B
Mod Signal
Charge Pump
Band B
Q547
5. Power Supply Circuit
5-1. Microcomputers and Peripheral Circuits
■Reset and Backup Circuits
The MPU reset signal detects a rising edge of the M5
line voltage with the reset IC (IC920). When the voltage
supplied to the transceiver decreases and the B line voltage
falls below the detection voltage of the voltage detection
IC (IC919), the MPU (IC918) detects it through the interrupt
terminal, stores the data in the EEPROM (IC916), and shuts
the power off.
5-2. Voltage Detection Processing
The MPU (IC918) monitors and process various voltage
statuses at A/D ports of IC918.
The squelch voltage is input from the FM IC and a
change in the noise voltage is detected to control squelch.
The S-meter voltage is input from the FM IC to control
the S-meter display.
The thermistor voltage (temperature) is also detected
through the A/D port.
CIRCUIT DESCRIPTION

TM-V71A/V71E
8
5-3. Serial Control
The MPU (IC918) controls the panel section (Display unit
X54-359) through synchronous serial communications.
PANEL
X54-359
MPU
IC918
Fig. 9 Structure of non-synchronized serial
communication
5-4. Narrow/ Wide Switching Circuit
On band A, the receiver bandwidth can be switched
between narrow and wide by selecting IF ceramic filters
CF487 (Narrow) and CF486 (Wide) with a switching circuit
(Q486, Q487, D486, D487).
On band B, the receiver bandwidth can also be switched
between narrow and wide by selecting IF ceramic filter
CF547 (Narrow) and CF546 (Wide) with a switching circuit
(Q546, Q548, D546, D547).
The transmitter deviation can be switched between
narrow and wide by setting the electronic variable resistor
(IC804) on the deviation adjustment point. It is controlled
from the MPU (IC918).
CF486
IC486
FM IC
D486 D487
CF WIDE
CF487
CF NARROW
CF546
IC546
FM IC
D546 D547
CF WIDE
CF547
CF NARROW
Fig. 10 Narrow/ Wide switching circuit
6. AF Signal System
6-1. Beep Circuit and Mute Circuit
A beep sound is generated by the MPU (IC918) and goes
to cross point switch (IC806). This signal is switched by
the cross point switch and is input to the electronic volume
(IC804). While the beep signal is output from the MPU,
audio signals for each band are muted by the cross point
switch with the serial data from the MPU (IC918). The beep
signal that has had its level adjusted by an electronic volume
is input to AF amplifier (IC801).
6-2. Speaker Switching Circuit
There are two speaker jacks, J801 (SP1) and J802 (SP2).
The AF signals can be output in various combinations
matching the internal speakers. When an external speaker is
not connected to J802 (SP2), the J802 signal is added to the
AF amplifier input of SP1 via the ATT circuit, and is output
through J801 (SP1). When an external speaker is connected
to J802 (SP2), it is output separately from a speaker for A /
B band. Crossing point switch connection can be switched
by switching the menu between MODE 1 and 2, and the
connection of SP1 and SP2.
The AF signal output combinations are shown in the
table below.
Mode Speaker
Setup
Band Output
Internal
Speaker
External
SP1
External
SP2
MODE 1
None A, B – –
SP1 only x A, B –
SP2 only A – B
SP1, SP2 x A B
MODE 2
None A, B – –
SP1 only x A, B –
SP2 only B – A
SP1, SP2 x B A
Table 1 AF signal output combinations
Q807 Q811
IC805
1/2
IC805
1/2
DE-EMPHASIS B
Q806
Q804 Q803
Q810
DE-EMPHASIS A
IC918
MPU
CTCSS Filter AMP
BEEP
DTMF
IC806
Cross
Point
SW
IC804
E VR
MUTE1
MUTE2
ATT
IC801
AF AMP
J801
(SP1)
J802
(SP2)
IC666
Multi
SW
IC486
FM IC (A)
IC546
FM IC (B)
Q816
Fig. 11 Beep circuit and mute circuit
CIRCUIT DESCRIPTION

TM-V71A/V71E
9
6-3. Microphone Key Input
■When the MC-59 (Supplied microphone) is used
The pulse is output from the CM terminal of the MPU to
the microphone. The MPU judges which key was pressed
from the number of pulses returned from the microphone.
■When the MC-45 (Optional microphone) is used
The microphone UP/DOWN and function keys are
connected to the microprocessor analog input. The voltage
when a key is ON operates the corresponding function.
100K
22K 22K
100K
PTT
UP
DOWN
CALL
VFO
MR
PF
R985
R984
R983
CP952
5M
MIC PTT
MIC UP
MIC DW
MPU
IC918
MIC
Fig. 12 Microphone (MC-45) key input
7. Data Terminal and Peripheral Circuits
J607 (Data terminal) is the data communications terminal
on the rear of the transceiver. It handles transmission
control, data input/ output, and squelch signals.
There are two data communications modes: 9600bps
mode and 1200bps mode. 9600bps mode communications
are GMSK and G3RUH packet communications. Unlike with
1200bps AFSK, with this type of high-speed modulation,
frequency modulation is carried out after the digital base
band signals (rectangular wave) are passed through a band
limiting filter. For 9600bps GMSK for example, compared
to 4800Hz signals (nearly sine wave signals passed
through a filter), the signals have a hissing sound like digital
modulation when listened to by ear. Different types of
modulation, such as GMSK and G3RUH, are distinguished
by the type of band limiting filter used.
Pin No. Pin name Specification
1 PKD
bps switching 1200bps 9600bps
Modulation input 40mVp-p 2Vp-p
Frequency shift 3±0.5kHz 2.2±0.5kHz
4 PR9 Output level 500mVp-p/10kΩ
Always output during reception
5 PR1 Output level 500mVp-p/10kΩ
Not output when squelch off
Table 2 DATA terminal input/ output level
7-1. Transmission Signals
Transmission modulation signals enter from PKD of the
data terminals (J607). The path to the modulation depends
on whether communications are set for 1200bps or 9600bps
mode.
For 1200bps mode, the transmission modulation signals
pass through the analog switch (IC803), and are input to
IC801 (Pin 6). The signals pass through the pre-emphasis
(Q801, Q802), are adjusted by the electronic volume, and
are input to the VCO.
For 9600bps mode, the transmission modulation signals
pass through IC803 and are amplified by the tone amp
(IC802). Signals are then adjusted by the electronic volume,
and are input to the VCO.
The frequency shift depends on the input signal level, so
there is an amplitude limiting circuit (D702, D703) to hold
the signal below 4 Vp-p to avoid extreme shifts. This circuit
ensures that the PKD signal does not go above 4 Vp-p and
there is no extreme frequency shift fluctuation.
Fig. 13 Transmission signals
Q807
Q606Q816 Q804 Q803
Q805 Q808
Q811
IC805
1/2
IC805
1/2
DE-EMPHASIS B
Q607
Q806 Q810
DE-EMPHASIS A
IC918
MPU
CTCSS Filter AMP
BEEP
DTMF
MUTE1
MUTE2
IC806
Cross
Point
SW
IC804
E VR
IC804
E VR
IC804
E VR
ATT
IC801
AF AMP
J801
(SP1)
J802
(SP2)
IC666
Multi
SW
IC486
FM IC (A)
IC546
FM IC (B)
IC806
Cross
Point SW
IC805
1/2
IC803
1/2
IC803
2/2
D607
D609
Limiter
1200bps
9600bps
PRE-EMPHASIS MOD AMP
VCO
TCXO
IC807
PR9
SQC
PKS
PKD
PR1
CIRCUIT DESCRIPTION

TM-V71A/V71E
10
7-2. Reception Signals
PR9 is the 9600bps data communications reception
output. It sends the FM detection circuit output (RD signals)
through a buffer amplifier (Q607). These signals are always
output whether the squelch is open or closed.
PR1 is the 1200bps data communications reception
output. It sends the FM detection circuit output (RA signals)
through a buffer amplifier (Q606). Output is controlled with
the cross point switch (IC806) according to whether squelch
is open or closed.
PR1: The audio signal that was de-emphasised is switched
by the cross point switch and passed through the
electronic volume. The signal is then buffered by Q606
and is sent to the data output terminal. The PR1 signal
is output when squelch is open.
PR9: The signal switched through IC666 is buffered by
Q607 and is sent to the data output terminal.
7-3. Squelch Signal Output Circuit
The squelch circuits is input to the TNC to prevent
conflicts from occurring between simultaneous
receive mode and transmit mode traffic during packet
communications (only during 1200bps). The SQC signal is
output by the MPU (IC918).
The SQC output can be set to the following using the
menu mode.
An initial value is Busy.TX. The logic of the output is Hi
active. The logic of the output can change by MCP-2A.
Menu No. Display SQC output type
520 SQC.SRC OFF/BUSY/SQL/TX/BUSY.TX/SQL.TX
Table 3 SQC output setting
8. Panel Section
The panel section controls serial communications with
the main unit control section, the key input circuit, the
display circuit, and the brightness circuit through the MPU
(IC903).
8-1. Serial Communications Circuit
A buffer IC (IC901, IC902) is used in order to protect the
MPU ports.
8-2. Key, Encoder, Volume Input Circuit
Circuits to operate the panel section keys are connected
to each microprocessor port. The POWER key is pulled up
and the other keys are pulled up within the MPU. Encoder
operating circuits are connected to the MPU and the port is
pulled up. The volume (VOL/SQ) divides the power supply
voltage, reads the A/D port of the MPU, and transfers that
data to the main unit.
8-3. Display Circuit
The MPU controls two LCD drivers (IC906, IC907). It
displays it by connecting IC906 (4 common dots and 39
segment dots) and IC907 (4 common dots and 38 segment
dots) with the LCD.
8-4. Brightness Circuit
The illumination color can be set to either amber or
green. The PWM signal output from the MPU passes
through LPF, is converted into the DC voltage, and controls
the current that flows to the LED with the transistor. The
duty of the PWM changes the LED brightness to one of
eight levels or OFF.
Q904
Q902
LPF
SW
Current
control
10V
PWM
AMBER
Q905
Q903
LPF
SW
Current
control
10V
PWM
GREEN
IC903
MPU
Fig. 14 Brightness circuit
CIRCUIT DESCRIPTION

TM-V71A/V71E
11
Main MPU: 3062LFGPUKBVB: K
3062LFGPUKBWB: E,M4
(TX-RX (Control) unit (D/6) IC918)
Pin No. Port Name I/O Function
1 DTMF/1750 O DTMF/Side tone output (D/A)
2 TONE O CTCSS, DCS output (D/A)
3 AMP_STB O AF power amplifier standby switch
L: Standby
4 BSHIFT O Beat shift circuit control L: Normal
5 NC - Not used (GND)
6 BYTE I Not used (GND)
7 NC - Not used (5V)
8,9 NC - Not used (GND)
10 RESET I System reset
11 XOUT O System clock output (11.0592MHz)
12 VSS I GND
13 XIN I System clock input (11.0592MHz)
14 VCC1 I 5V power supply input
15 NMI I Not used (5V)
16 NC - Not used (Connect to RXD (PC))
17 SIS I Start-up interruption from panel MPU
(Connect to RXD (PNL))
18 INT I
Power supply voltage fall detection
interrupt
( It is detected by approximately 8.8V.)
19 XSW_LD O Cross point switch LOAD
20
PKD96_MUTE O PKD 9600bps mute switch H: Mute
21 EEPCS O EEPROM chip select signal
22 EEPSO I EEPROM serial data input
23 MIC_MUTE2 O MIC mute (After passing the splatter
filter.) H: Mute
24 EEPCK O EEPROM serial clock output
25 EEPSI O EEPROM serial data output
26 BEEP O Beep sound output
27 RXD (PNL) I UART data input from Panel
28 TXD (PNL) O UART data output to Panel
29 TR_DT O Data terminal (Serial-parallel, DAC,
PLL, and VGS) for TX-RX unit
30 TR_CLK O CLK terminal (Serial-parallel, DAC,
PLL, and VGS) for TX-RX unit
31,32 NC - Not used (GND)
33 TXD (PC) O UART data output to PC terminal
34 RXD (PC) I UART data input from PC terminal
35 PTT I [PTT] key input
36 PKS (PNL) I Internal TNC PKS input
Pin No. Port Name I/O Function
37 SQC (PNL) O Internal TNC SQC output
38 CNT_DT O Serial data for DAC (M62364) and
cross point switch
39 NC - Not used (GND)
40 CNT_CLK O Clock for DAC (M62364) and cross
point switch
41
TCXO_B_MUTE O B band TCXO mute switch L: Mute
42
TCXO_A_MUTE O A band TCXO mute switch L: Mute
43 DA1_EN O Enable output for DAC (M62364)
44 NC - Not used (5V)
45 MIC_MUTE1 O MIC mute (Front of MIC amplifier)
H: Mute
46~52 SIM6~SIM0 I Type 6~Type 0
53 B_PLLUL I Unlock detection for B band
H: Lock
54 A_PLLEN O PLL enable output for A band
H: Enable
55 A_PLLUL I Unlock detection for A band
H: Lock
56 B_PLLEN O PLL enable output for B band
H: Enable
57 2099_EN O Enable output for serial-parallel
conversion IC (BU2099FV)
58 DA2_EN O Enable output for external DAC
(BH2228FV)
59 NC - Not used (GND)
60 VCC2 I 5V power supply input
61 NC - Not used (GND)
62 VSS2 I GND
63 VRST O VGS-1 RESET signal output
64 VEN O VGS-1 ENABLE signal output
65 VPLY I VGS-1 PLAY signal input
66 VBSY I VGS-1 BUSY signal input
67 VSF I Transmission protection A/D input
(FWD side)
68 TEMP I Temperature protection A/D input
69 PKS (EXT) I PTT control terminal from mini DIN
terminal (PKS)
70 SQC (EXT) O BUSY control terminal to mini DIN
terminal (SQC)
71 CTS (PC) I PTT control terminal from PC terminal
72 RTS (PC) O BUSY control terminal to PC terminal
73,74 NC - Not used (5V)
75 SB_C O Main power switch of transceiver
(SBSW)
SEMICONDUCTOR DATA

TM-V71A/V71E
12
Pin No. Port Name I/O Function
76 PKD_SEL O PKD input switching (PKD (PNL) or
PKD (EXT))
77 VU_TX O L:VHF TX, H:UHF TX (V/U switching)
H: Mute
78 CM I MIC key serial input terminal
(for MC-59)
79 MIC_DW I MIC key (DOWN, MR, PF) input
(for MC-45)
80 MIC_UP I MIC key (UP, CALL, VFO) input
(for MC-45)
81 SQ_B I Noise level A/D input for B band
82 SQ_A I Noise level A/D input for A band
83 SM_B I S-meter level A/D input for B Band
84 SM_A I S-meter level A/D input for A Band
85 TOIN_B I B band (CTCSS, DCS, and WX)
decoder A/D input
86 TOIN_A I A band (CTCSS, DCS, and WX)
decoder A/D input
87 SCB_C O +B power switch for control unit
(power supply for AF power amplifier)
88 S5M_C O Power switch for RS-232C driver
89 BATT - Not used
90 DTMFPD O
Power down mode control terminal
of the DTMF IC (Reset processing
when the turning the transceiver
power ON.)
91 DTMFDT I DTMF serial data input
92 DTMFCLK O DTMF clock
93 DTMFDET I DTMF data detection terminal
94 AVSS I GND
95 AF_CAL I Not used
96 VREF I Reference voltage
97 AVCC I Analog power supply
98 AF_MUTE2 O AF mute 2 (Front of AF power amp-
lifier) L: Mute
99 AF MUTE1 O AF mute 1 (Front of AF power amp-
lifier) L: Mute
100 AMP_MUTE O AF power amplifier mute switch
H: Mute
Shift Register: BU2099FV (TX-RX unit (A/6) IC576)
Pin
No.
Port
name
Pin name I/O Function Active
level
6 Q0 WN_A O Wide/Narrow switching
SW for A band
H (Narrow)
/ L (Wide)
7Q1 VU_SEL_A O VCO VHF/UHF select H: VHF
L: UHF
8 Q2 8TVA_C O 8V power supply control
switch for A Band VHF TX H
9 Q3 5RUA_C O 5V power supply switch
for A Band UHF BPF H
10 Q4 VHF_AIP O AIP switch (A band/B band) H
11 Q5 FAN_C O FAN control switch H
12 Q6 SFT_A O VCO switching (A band)
H: Shift ON
L: Shift OFF
13 Q7 UHF_AIP O AIP switch (A band/B band) H
14 Q8 8TUA_C O 8V power supply control
switch for A band UHF TX H
15 Q9 5RVA_C O 5V power supply switch
for A band VHF BPF H
16 Q10
BP_SFT_A O BPF shift switch for A band H
17 Q11 5RAM_C O
5V power supply switch
(DET A switching SW) for
A band AM
H (DET A)
/ L (AM)
Shift Register: BU2099FV (TX-RX unit (A/6) IC577)
Pin
No.
Port
name
Pin name I/O Function Active
level
6 Q0 WN_B O Wide/Narrow switching
SW for B band
H (Narrow)
/ L (Wide )
7Q1 VU_SEL_B O VCO VHF/UHF select H: VHF
L: UHF
8 Q2 8TUB_C O 8V power supply control
switch for B band UHF TX H
9 Q3 5RUB_C O 5V power supply switch
for B band UHF BPF H
10 Q4 PR9_SEL O PR9 output switching SW
H (DET_A)
/ L (DET_B)
11 Q5 PR (PNL)_SEL ODET output switching SW
to internal TNC
H (DET_A)
/ L (DET_B
12 Q6 SFT_B O VCO switching (B band)
H: Shift ON
L: Shift OFF
13 Q7 8TVB_C O 8V power supply control
switch for B band VHF TX H
14 Q8 NC - Not used (5V) H
15 Q9 5RVB_C O 5V power supply switch
for B band VHF BPF H
16 Q10 5R8B_C O 5V power supply switch
for B band 800MHz BPF H
17 Q11
BP_SFT_B O BPF shift switch for B band H
SEMICONDUCTOR DATA

TM-V71A/V71E
13
Electorical Volume IC: M62364FP-F
(TX-RX (Control) unit (D/6) IC804)
Pin No. Pin name Function
1 VIN1 B band balance adjustment input
2 VOUT1 B band balance adjustment output
3 VOUT2 A band blance adjustment output
4 VIN2 A band blance adjustment input
9 VIN3 TX deviation adjustment input
10 VOUT3 TX deviation adjustment output
11 VOUT4 MIC sensitivity adjustment output
12 VIN4 MIC sensitivity adjustment input
13 VIN5 SP2 output VOL adjustment input
14 VOUT5 SP2 output VOL adjustment output
15 VOUT6 SP1 output VOL adjustment output
16 VIN6 SP1 output VOL adjustment input
21 VIN7
DATA terminal PR1 output level adjustment input
22 VOUT7 DATA terminal PR1 output level adjustment output
23 VOUT8 DATA terminal PKD input level adjustment output
24 VIN8 DATA terminal PKD input level adjustment input
Cross Point Switch: BU8241FS
(TX-RX (Control) unit (D/6) IC806)
Pin No. Pin name Function
5 IN1
A band RX audio input (De-emphasis circuit output)
6 IN2 B band RX audio input (De-emphasis circuit output)
7 IN3 DTMF (1750Hz tone) encode signal input from MPU
8 IN4 Beep signal input from MPU
9 IN5 MIC audio input (MIC amplifier and AGC output)
10 IN6
PKD 1200bps data input and Audio input from PC
11 IN7 RX audio input to internal TNC
12 IN8 VGS-1 playing audio input
13 OUT8 SP2 audio output VOL
14 OUT7 SP1 audio output VOL
15 OUT6 DATA terminal PR1 output
(Input to DAC for level adjustment)
16 OUT5 VGS-1 recording audio output
17 OUT4 Audio level detection output to MPU
18 OUT3 RX audio output to DTMF IC
19 OUT2 MIC audio output
(Limiter and Pre-emphasis circuit input)
20 OUT1 RX audio output to internal TNC
Panel MPU: 3062LFGPUKBZA
(Display unit IC903)
Pin No. Port Name I/O Function
1 KEY4 I [CALL] key input
2 KEY3 I [MHz] key input
3 NC - Not used (5V)
4 KEY2 I [MR] key input
5 KEY1 I [VFO] key input
6 BYTE I Not used (GND)
7 NC - Not used (GND)
8 ENC_B I Encoder 1
9 NC - Not used (GND)
10 RESET I System reset
11 XOUT O System clock output (11.0592MHz)
12 VSS I GND
13 XIN I System clock input (11.0592MHz)
14 VCC I 5V power supply input
15 NMI I Not used (5V)
16 ENC_A I Encoder 2 (INT)
17 RXD_INT I RXD detection
18 POWER I Power switch detection interrupt
19,20 NC - Not used (GND)
21 LCD_CE_1 O LCD driver 1 CE
22 LCD_CLK_1 O LCD driver 1 CLK
23 LCD_DT_1 O LCD driver_1 data
24 AMBER O Dimmer output PWM (Amber)
25 NC - Not used (GND)
26 GREEN O Dimmer output PWM (Green)
27 PSW O 5V switch L: ON
28 NC - Not used (GND)
29 TXD O UART output to main MPU
30 RXD I UART input from main MPU
31 CLK - Not used (GND)
32 BUSY - Not used (5V)
33~38 NC - Not used (GND)
39 EMP - Not used (GND)
40~43 NC - Not used (GND)
44 CE - Not used (5V)
45~59 NC - Not used (GND)
60 VCC I 5V power supply input
61 NC - Not used (GND)
62 VSS I GND
SEMICONDUCTOR DATA

TM-V71A/V71E
14
Pin No. Port Name I/O Function
63~67 NC - Not used (GND)
68 LCD_DT_2 O LCD driver 2 data
69 LCD_CLK_2 O LCD driver 2 CLK
70 LCD_CE_2 O LCD driver 2 CE
71 NC - Not used (5V)
72 KEY13 I [PM] key input
73 KEY12 I [Band SEL B] key input
74 KEY11 I [Band SEL A] key input
75 KEY10 I [PF2] key input
76 KEY9 I [PF1] key input
77 KEY8 I [LOW] key input
78 KEY7 I [REV] key input
Pin No. Port Name I/O Function
79~90 NC - Not used (GND)
91 VOL_B I AF VOL (Band B) A/D input
92 VOL_A I AF VOL (Band A) A/D input
93 SQL_B I SQL (Band B) A/D input
94 AVSS I GND
95 SQL_A I SQL (Band A) A/D input
96 VREF I Reference voltage input
97 AVCC I Analog power supply input
98 NC - Not used (5V)
99 KEY6 I [TONE] key input
100 KEY5 I [F] key input
SEMICONDUCTOR DATA
COMPONENTS DESCRIPTION
DISPLAY UNIT (X54-3590-00)
Ref. No. Use / Function Operation / Condition / Compatibility
IC901 Buffer RXD
IC902 Buffer TXD
IC903 MPU
IC904 5V AVR 5V
IC905 Reset IC for MPU
IC906,907 LCD driver
Q901 Switching SW5V for LCD driver IC
Q902 Switching GR10V control
Q903 Switching AM10V control
Q904 Switching 10V for Green LED
Q905 Switching 10V for Amber LED
D901~921 Switching Protection from surge input
D922~951 LED Amber
D952~983 LED Green
D984~986 LED Amber
D987 LED Green
D988,989 Varistor Protection from surge input
TX-RX UNIT (X57-731X-XX)
Ref. No. Use / Function Operation / Condition / Compatibility
IC1 PLL IC A band
IC66 PLL IC B band
IC131 Power module VHF
IC161 Power module UHF
IC186 2CH analog
switch APC voltage VHF/UHF select
IC187 OP amplifier for APC
IC486 FM IC A band
IC487 OP amplifier AGC amplifier
IC546 FM IC B band
IC576 Shift register
Q0: Wide/Narrow select for A band
Q1: VU_Select for A band
Q2: 8TVA control
Q3: 5RUA control
Q4: VHF AIP control
Q5: FAN control
Q6: VCO shift for A band
Q7: UHF AIP control
Q8: 8TUA control
Q9: 5RVA control
Q10: VHF BPF control for A band
Q11: 5RAM control

TM-V71A/V71E
15
Ref. No. Use / Function Operation / Condition / Compatibility
IC577 Shift register
Q0: Wide/Narrow select for B band
Q1: VU_Select for B band
Q2: 8TUB control
Q3: 5RUB control
Q4: PR9 select
Q5: PR for panel select
Q6: VCO shift for B band
Q7: 8TVB control
Q8: Not used
Q9: 5RVB control
Q10: 5R8B cintrol
Q11: VHF BPF control for B band
IC578 8V AVR 8C
IC579 5V AVR 5C
IC606
RS-232C driver IC RS-232C driver
IC666
4CH multiplexer Detect signal line select
IC667 D/A
Ao1: Forward Ref
Ao2: Reverse Ref
Ao3: BPF control for B band
Ao4: BPF control for B band
Ao5:
TCXO reference voltage for B band
Ao6: TCXO reference voltage for A band
IC668 Amplifier LNA for 1.2G RX
IC801 Audio amplifier
IC802 OP amplifier MIC amplifier/ALC
IC803 OP amplifier Pre-emphasis/Modulation
IC804 Electorical
volume IC Modulation line select
IC805
4CH OP amplifier
AV reference voltage/PKD amplifier/
LSD amplifier A/LSD amplifier B
IC806 Cross point
switch IC Audio line select
IC807 2CH analog
switch Modulation line for TCXO select
IC916 EEPROM
IC917 Multiplexer PKD line select
IC918 MPU
IC919 Reset IC Backup signal
IC920 Reset IC Reset signal for MPU
IC921 DTMF decoder
IC951 Buffer Panel output line
IC952 10V AVR PB
IC953 5V AVR 5C
Q1 Ripple filter for A band charge pump
Q2,3 Switching A band charge pump
Q4 Ripple filter for A band VCO
Q5 Amplifier to f-in on PLL IC
Q6 Switching VHF/UHF selection for A band VCO
(On when A band VHF is selected)
Ref. No. Use / Function
Operation / Condition / Compatibility
Q7 Amplifier Local amplifier for A band
Q8 Switching A band PLL f-in filter select
(On when B band VHF is selected)
Q9 Switching B band f-in VHF filter frequency shift
Q66 Ripple filter for B band charge pump
Q67,68 Switching B band charge pump
Q69 Ripple filter for A band VCO
Q70 Amplifier to f-in on PLL IC
Q71 Switching VHF/UHF selection for B band VCO
(On when A band VHF is selected)
Q72 Amplifier Local amplifier for B band
Q73 Switching B band PLL f-in filter select
(On when B band VHF is selected)
Q74 Switching A band f-in VHF filter frequency shift
Q131 Amplifier VHF TX drive amplifier
Q132 Switching Mute Vgg line for VHF power module
Q161 Amplifier UHF TX Pre-drive amplifier
Q162 Amplifier UHF TX drive amplifier
Q163 Switching
Mute Vgg line for UHF power module
Q186 Switching VHF/UHF selection (On when VHF TX)
Q226 Mixer A band VHF RX
Q227 Amplifier A band VHF RX 2nd LNA
Q228 Amplifier A band VHF RX LNA
Q229 Switching Q228 gain drop (VHF AIP function)
(On when VHF AIP ON)
Q291 Mixer B band VHF RX
Q292 Amplifier B band VHF RX 2nd LNA
Q293 Amplifier B band VHF RX LNA
Q294 Switching Q293 gain drop (VHF AIP function)
(On when VHF AIP ON)
Q361 Mixer A band UHF RX
Q362 Amplifier A band UHF RX 2nd LNA
Q363 Amplifier A band UHF RX LNA
Q400 Switching Q363 gain drop (UHF AIP function)
(On when UHF AIP ON)
Q406 Mixer B band UHF RX
Q407 Amplifier B band UHF RX 2nd LNA
Q408 Amplifier B band UHF RX LNA
Q450 Switching Q408 gain drop (UHF AIP function)
(On when UHF AIP ON)
Q456 Amplifier Local amplifier for 1.2G RX
Q457 Mixer B band 1.2G RX
Q459 Amplifier B band 1.2G RX LNA
COMPONENTS DESCRIPTION

TM-V71A/V71E
16
Ref. No. Use / Function Operation / Condition / Compatibility
Q486 Switching Ceramic filter select (On when FM-
Narrow is selected on A band)
Q487 Switching Ceramic filter select (On when FM-
Wide is selected on A band)
Q488 Switching Squelch select (On when FM-
Narrow is selected on A band)
Q489 Amplifier AM IF AGC amplifier
Q490 Switching AGC switch
Q491 Amplifier AM IF AGC amplifier
Q492 Switching AGC switch
Q493 Amplifier
A band discriminator dump switch (On
when FM-Wide is selected on A band)
Q494 Amplifier AM IF AGC amplifier
Q495 Amplifier A band 1st IF amplifier
Q496 Switching AGC voltage select (AM/FM) (On
when FM is selected on A band)
Q546 Switching Ceramic filter select (On when FM-
Narrow is selected on B band)
Q547 Tripler 16.8MHz×3
Q548 Switching Ceramic filter select (On when FM-
Wide is selected on B band)
Q549 Switching Squelch select (On when FM-
Narrow is selected on B band)
Q550 Switching
B band discriminator dump switch (On
when FM-Wide is selected on B band)
Q551 Amplifier B band 1st IF amplifier
Q572 Switching Make BP_SFT_B signal
Q573 Switching Make BP_SFT_B_I signal
Q574 Switching Make BP_SFT_A signal
Q575 Switching Make BP_SFT_A_I signal
Q576 Switching Fan control (On when Fan turn)
Q578 Switching 5RVA switch
(On when A band VHF is selected)
Q579 Switching 5RUA switch
(On when A band UHF is selected)
Q580 Switching 5RAM switch
(On when A band AM is selected)
Q582 Switching 5RVB switch
(On when B band VHF is selected)
Q583 Switching 5RUB switch
(On when B band UHF is selected)
Q584 Switching 5R8B switch (On when B band 1.2G
is selected)
Q585 Switching 8TV switch (On when VHF TX)
Q586 Switching 8TU switch (On when UHF TX)
Q587 Switching
8TVA switch (On when A band VHF TX)
Ref. No. Use / Function Operation / Condition / Compatibility
Q588 Switching 8TUA switch (On when A band UHF TX)
Q589 Switching 8TVB switch (On when B band VHF TX)
Q590 Switching 8TUB switch (On when B band UHF TX)
Q591,592 Switching SB switch
(On during transceiver power ON)
Q606 Amplifier PR1 amplifier in DATA terminal (J607)
Q607 Amplifier PR9 amplifier in DATA terminal (J607)
Q641 Switching FAN control switch
Q642 Switching IGN control switch
Q644 Amplifier VHF TX Pre-drive
Q701,702 Switching Shift VCO frequency range
Q703,704 Switching VCO select (VHF/UHF)
Q705 Oscilator VHF VCO
Q706 Oscilator UHF VCO
Q707 Amplifier RF amplifier
Q751,752 Switching Shift VCO frequency range
Q753,754 Switching VCO select (VHF/UHF)
Q755 Oscilator VHF VCO
Q756 Oscilator UHF VCO
Q757 Amplifier RF amplifier
Q801 Amplifier AGC control
Q802 Switching Audio amplifier (IC801) mute switch
Q803,804 Switching Audio line mute switch
Q805 Active filter for splatter filter
Q806 Active filter A band de-emphasis filter amplifier
Q807 Active filter B band de-emphasis filter amplifier
Q808 Active filter for splatter filter
Q809 Switching MIC mute
Q810 Active filter A band de-emphasis filter amplifier
Q811 Active filter B band de-emphasis filter amplifier
Q812 Switching PKD 9600bps mute switch
Q816 Switching Audio line mute switch
Q817 Switching TCXO modulation level change
(On when UHF TX)
Q916,917 Switching Crystal oscillator frequency shift switch
Q918 Switching Over voltage protection switch
Q951 Switching SCB switch
Q952 Switching S5M switch
Q953 Switching SCB switch
Q954 Switching S5M switch
Q955 Switching PR1 amplifier for Panel
COMPONENTS DESCRIPTION

TM-V71A/V71E
17
Ref. No. Use / Function Operation / Condition / Compatibility
D1 Reverse current
prevention A band PLL unlock signal
D2 Voltage shift A band charge pump
D3,4 Switching Speed up switch for ripple filter
D5,6 Switching Speed up switch for Loop filter
D10~13 Switching VHF/UHF BPF select
D14,18 Switching
RF switch (On when A band VHF TX)
D15 Switching RF switch (On when A band UHF)
D16 Switching
RF switch (On when A band VHF RX)
D17 Switching RF switch (On when A band UHF RX)
D19 Switching RF switch (On when A band UHF TX)
D20,21 Switching VHF BPF shift
D22 Switching
RF switch (On when B band VHF TX)
D23 Switching RF switch (On when B band UHF)
D24 Switching
RF switch (On when B band VHF RX)
D25 Switching RF switch (On when B band UHF RX)
D26 Switching RF switch (On when B band VHF TX)
D27 Switching RF switch (On when B band UHF TX)
D28 Switching Line mute (On when B band UHF TX)
D29 Switching Line mute (On when A band UHF TX)
D30~33 Switching VHF/UHF BPF select
D34,35 Switching VHF BPF shift
D66 Switching B band PLL unlock signal
D67 Voltage shift B band charge pump
D68,69 Switching Speed up switch for ripple filter
D70,71 Switching Speed up switch for Loop filter
D130 Switching
RF switch (On when A band VHF TX)
D131 Switching RF switch (On when B band VHF TX)
D132 Temperature
compensation for VHF drive circuit
D133 5.1V Zener diode Over voltage prevention
D134,135 Switching VHF TX RF switch
D136 Temperature
compensation for thermal protection circuit
D160 Switching
RF switch (On when A band UHF TX)
D161 Switching RF switch (On when B band UHF TX)
D162 Temperature
compensation for UHF drive circuit
D163 5.1V Zener diode Over voltage prevention
D164,165 Switching UHF TX RF switch
D166 Temperature
compensation for thermal protection circuit
Ref. No. Use / Function
Operation / Condition / Compatibility
D186 Switching RF switch
D187 Switching RF switch
D188 Switching RF switch
D189 Switching RF switch
D190 Reverse current
prevention APC circuit
D191 Rectification Forward voltage for APC circuit
D192 Rectification Reverse voltage for APC circuit
D193
5.1V Zener diode Over voltage prevention
D226 Switching
IF switch (On when A band VHF RX)
D227 Switching Local signal switch
(On when A band VHF RX)
D229 Switching BPF frequency shift
D230,231 Varicap Tune the A band VHF BPF
D232 Switching BPF frequency shift
D233,234 Varicap Tune the A band VHF BPF
D238 Switching BPF frequency shift
D239,240 Varicap Tune the A band VHF BPF
D241 Switching BPF frequency shift
D242,243 Varicap Tune the A band VHF BPF
D291 Switching
IF switch (On when B band VHF RX)
D292 Switching Local signal switch
(On when B band VHF RX)
D294 Switching BPF frequency shift
D295,296 Varicap Tune the B band VHF BPF
D297 Switching BPF frequency shift
D298,299 Varicap Tune the B band VHF BPF
D303 Switching BPF frequency shift
D304,305 Varicap Tune the B band VHF BPF
D306 Switching BPF frequency shift
D307,308 Varicap Tune the B band VHF BPF
D356 Switching RF mute
D357,358 Limiter VHF RF limiter
D361 Switching
IF switch (On when A band UHF RX)
D362,363 Switching Local signal switch
(On when A band UHF RX)
D364,365 Varicap Tune the A band UHF BPF
D367,368 Varicap Tune the A band UHF BPF
D370,371 Varicap Tune the A band UHF BPF
D375,376 Varicap Tune the A band UHF BPF
D377~379 Varicap Tune the A band UHF BPF
D406 Switching IF switch (on when B band UHF RX)
COMPONENTS DESCRIPTION

TM-V71A/V71E
18
Ref. No. Use / Function Operation / Condition / Compatibility
D407,408 Switching Local signal switch
(on when B band UHF RX)
D409,410 Varicap Tune the B band UHF BPF
D412,413 Varicap Tune the B band UHF BPF
D415,416 Varicap Tune the B band UHF BPF
D419~421 Varicap Tune the B band UHF BPF
D423,424 Varicap Tune the B band UHF BPF
D451 Switching RF mute
D456 Switching IF switch (on when 1.2G RX)
D457 Switching
Local signal switch (on when 1.2G RX)
D486,487 Switching A band RX ceramic filter select
D488 Detection AM AGC voltage detection
D489 Detection AM detection
D546,547 Switching B band RX ceramic filter select
D576 Reverse current
prevention 5RA output
D578 Reverse current
prevention 5RB output
D580 Reverse current
prevention 5RB output
D582 Reverse current
prevention 8TV control for A band
D583 Reverse current
prevention 8TV control for B band
D584 Reverse current
prevention 8TU control
D606 Reverse current
prevention for alignment
D607 Limiter Prevention from over level input
D608 Reverse current
prevention for alignment
Ref. No. Use / Function
Operation / Condition / Compatibility
D609 Limiter Prevention from over level input
D610,611 Switching Protection from surge input
D612 Surge absorber Protection from surge input
D701 Switching UHF VCO shift
D703 Varicap UHF VCO tune
D704 Varicap VHF VCO tune
D705 Varicap UHF VCO tune
D707 Varicap VHF VCO tune
D708 Switching VHF VCO shift
D709 Varicap for VHF VCO modulation
D710 Varicap for UHF VCO modulation
D751 Switching UHF VCO shift
D753 Varicap UHF VCO tune
D754 Varicap VHF VCO tune
D755 Varicap UHF VCO tune
D757 Varicap VHF VCO tune
D758 Switching VHF VCO shift
D759 Varicap for VHF VCO modulation
D760 Varicap for UHF VCO modulation
D801,802 Switching MIC mute
D916 18V Zener diode Over voltage prevention
D951~953 Limiter Protection from surge input
D954 Reverse current
prevention 8C
D955 5.1V Zener diode Over voltage prevention
D956 Poly-switch Current limit
D957 Reverse current
prevention 5M
COMPONENTS DESCRIPTION

TM-V71A/V71E
19
DISPLAY UNIT (X54-3590-00)
Pin No. Name I/O Function
CN902
1 GND - GND
2 SW5V I Switched 5V
3 KEY11 O Volume key signal (A band)
4 VOL_A O AF volume voltage (A band)
5 SQL_A O SQL volume voltage (A band)
CN903
1 GND - GND
2 SW5V O Switched 5V
3 KEY11 I Volume key signal (A band)
4 VOL_A I AF volume voltage (A band)
5 SQL_A I SQL volume voltage (A band)
CN904
1 GND - GND
2 SW5V I Switched 5V
3 KEY12 O Volume key signal (B band)
4 VOL_B O AF volume voltage (B band)
5 SQL_B O SQL volume voltage (B band)
CN905
1 GND - GND
2 SW5V O Switched 5V
3 KEY12 I Volume key signal (B band)
4 VOL_B I AF volume voltage (B band)
5 SQL_B I SQL volume voltage (B band)
CN912 (to TX-RX (CONTROL) unit D/6)
1 PB I 10V for Display unit
2 PB I 10V for Display unit
3 GND - GND
4 GND - GND
5 RXD I Serial signal input (from main MPU)
6 TXD O Serial signal output (to main MPU)
TX-RX UNIT (X57-731X-XX) (A/6): TX-RX Section
Pin No. Name I/O Function
CN641 (for FAN)
1SB OFAN1+
2 FAN_C I FAN 1-
CN642 (for VGS-1)
1 VBSY I VGS-1 busy signal
2 VPLY I VGS-1 play signal
Pin No. Name I/O Function
3 SO - No connection
4 DATA O Data signal output for VGS-1
5 CLK O CLK for VGS-1
6 VEN O Enable signal for VGS-1
7 USEL - No connection
8 VRST O VGS-1 reset signal
9 DGND - DGND
10 AGND - GND
11 VAI I VGS-1 audio input
12 VAO O VGS-1 audio output
13 AGND - GND
14 5C O Switched 5V for VGS-1
15~26 NC - No connection
CN676 (to TX-RX (CONTROL) unit D/6)
1 GND - GND
2CB OB
CN677 (to TX-RX (CONTROL) unit D/6)
1 S5M I Switched 5V for RS-232C driver (IC606)
2 NC - No connection
3 8C O Switched 8V
4 NC - No connection
5 5C O Switched 5V
6 NC - No connection
7 SB_C I SB control signal
8 ILLM O Illumination signal
9 IGN O Ignition signal
10 TXD (PC) I TXD input for PC
11 RXD (PC) O RXD output from PC
12 RTS (PC) I RTS input for PC
13 CTS (PC) O CTS output from PC
14 SQC (EXT) O SQC signal output
15 PKS (EXT) O PKS signal output
16 PKD (EXT) I PKD signal input
17 PR1 (EXT) I PR1 signal input
18 GND - GND
19 SM_A O A band S-meter voltage output
20 SQ_A O A band SQL voltage output
21 VSF O VSF voltage output
22 TEMP O Thermistor voltage output
23 SM_B O B band S-meter voltage output
24 SQ_B O B band SQL voltage output
TERMINAL FUNCTION

TM-V71A/V71E
20
Pin No. Name I/O Function
25 GND - GND
26 DET_A O A band detect signal output
27 PR (PNL) O PR detect signal output for panel
28 DET_B O B band detect signal output
29 GND - GND
30 VBSY I VGS-1 busy signal
31 VPLY I VGS-1 play signal
32 VEN I Enable signal for VGS-1
33 VRST I VGS-1 reset signal
34 DA2_EN I Enable signal for D/A IC (IC667)
35 2099_EN I Enable signal for shift register (IC576)
36 TR_CLK I Clock
37 TR_DT I Data
38 B_PLLEN I Enable signal for B band PLL (IC66)
39 A_PLLUL O Unlock signal from A band PLL (IC1)
40 A_PLLEN I Enable signal for A band PLL (IC1)
41 B_PLLUL O Unlock signal from B band PLL (IC66)
42 VGSPLAY O Audio output from VGS-1
43 TCXO_A I Modulation signal for A band TCXO
44 VCO_B I Modulation signal for B band VCO
45 VCO_A I Modulation signal for A band VCO
46 TCXO_B I Modulation signal for B band TCXO
47 VGSREC I Audio input (VGS-1)
48 SIM0 O Type
49 SIM1 O Type
50 SIM2 O Type
J606 (8-pin mini DIN: PC terminal)
1 RTS O Request to send
2 CTS I Clear to send
3 TXD O Transmit data
4 GND - GND
5 RXD I Receive data
6 NC - No connection
7 NC - No connection
8 NC - No connection
J607 (6-pin Mini DIN: DATA terminal)
1 PKD I Packet data input
2 GND - GND
3 PKS I Packet standby
4 PR9 O Output of detected 9600bps data
5 PR1 O Output of detected 1200bps data
Pin No. Name I/O Function
6 SQC O Squelch control output
TX-RX UNIT (X57-731X-XX) (B,E/6): VCO A Section
Pin No. Name I/O Function
CN701
1 SHIFT I VCO shift signal
2 V/U I VHF VCO/UHF VCO select signal
3 CV I VCO control voltage
4 MOD I Modulation signal input
CN702
1 OUT O Oscillation signal output
2 E - GND
3 8C I 8V for VCO
TX-RX UNIT (X57-731X-XX) (C,F/6): VCO B Section
Pin No. Name I/O Function
CN751
1 SHIFT I VCO shift signal
2 V/U I VHF VCO/UHF VCO select signal
3 CV I VCO control voltage
4 MOD I Modulation signal input
CN752
1 OUT O Oscillation signal output
2 E - GND
3 8C I 8V for VCO
TX-RX UNIT (X57-731X-XX) (D/6): CONTROL Section
Pin No. Name I/O Function
CN960 (to TX-RX unit A/6)
1 SIM2 I Type
2 SIM1 I Type
3 SIM0 I Type
4 VGSREC O Audio output (VGS-1)
5 TCXO_B O Modulation signal for B band TCXO
6 VCO_A O Modulation signal for A band VCO
7 VCO_B O Modulation signal for B band VCO
8 TCXO_A O Modulation signal for A band TCXO
9 VGSPLAY I Audio input from VGS-1
10 B_PLLUL I Unlock signal from B band PLL (IC66)
11 A_PLLEN O Enable signal for A band PLL (IC1)
12 A_PLLUL I Unlock signal from A band PLL (IC1)
TERMINAL FUNCTION