Kenwood TK-3107 User manual

© 2000-2 PRINTED IN JAPAN
B51-8572-00(S) 141
TK-3107
GENERAL.................................................................. 2
REALIGNMENT......................................................... 2
DISASSEMBLY FOR REPAIR................................... 4
CIRCUIT DESCRIPTION ........................................... 5
SEMICONDUCTOR DATA ......................................... 8
DESCRIPTION OF COMPONENTS.......................... 9
PARTS LIST............................................................. 10
EXPLODEDVIEW ................................................... 17
PACKING ................................................................. 18
ADJUSTMENT......................................................... 19
PC BOARD VIEWS
TX-RX UNIT (X57-6030-11) ................................ 23
SCHEMATIC DIAGRAM .......................................... 29
BLOCK DIAGRAM .................................................. 33
LEVEL DIAGRAM ................................................... 35
KNB-15A (Ni-Cd BATTERY) ................................... 36
SPECIFICATIONS ................................BACK COVER
Antenna
(T90-0694-15)
Cabinet assy
(A02-2448-13)
Knob(VOLUME)
(K29-5255-03)
TK-3107 (16 channels)
CONTENTS
Knob
(CHANNEL SELECTOR)
(K29-5278-03)
UHF FM TRANSCEIVER
SERVICE MANUAL
M2 version

2
TK-3107
MODE FUNCTION
User Mode Use this mode for normal operation.
PC Mode Use this mode, to make various
settings by means of the FPU through
the RS-232C port.
Manufacture Mode Use this mode, to realign the various
settings through the RS-232C port
during manufacture work.
2 How to enter each mode
MODE PROCEDURE
User Mode Power ON
PC Mode Connect to the IBM PC compatible
machine and controled by the FPU.
1 Modes
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced technicians
familiar with similar types of commercial grade
communications equipment. It contains all required service
information for the equipment and is current as of the
publication data. Changes which may occur after publication
are covered by either Service Bulletins or Manual Revisions.
These are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment
information, the full part identification number should be
included. This applies to all parts : components, kits, or
chassis. If the part number is not known, include the chassis or
kit number of which it is a part, and a sufficient description of
the required component for proper identification.
PERSONAL SAFETY
The following precautions are recommended for personal
safety :
• DO NOT transmit until all RF connectors are verified secure
and any open connectors are properly terminated.
• SHUT OFF and DO NOT operate this equipment near
electrical blasting caps or in an explosive atmosphere.
• This equipment should be serviced by a qualified
technician only.
SERVICE
This radio is designed for easy servicing. Refer to the
schematic diagrams, printed circuit board views, and
alignment procedures contained within.
GENERAL/REALIGNMENT
3 Getting acquainted
PC ModeUser Mode Manufacture Mode
Destnation Number of CH RF power output
M2 16 4W
SpeakerAntenna
Speaker/
microphone
jacks
Microphone
①PTT (Push-To-Talk) switch
Press this switch, then speak into the microphone to
call a station. Release the switch to receive.
②Monitor key
Press and hold to monitor how busy the current
channel is and to monitor signals being received that
do not contain the matched QT/DQT code.
③Channel selector
Rotate to select channels 1 ~ 16.
➃LED indicator
Lights red while transmitting, green while receiving a
signal. Flashes red when the battery voltage is low
while transmitting.
⑤Power switch/Volume control
Turn clockwise to switch the transceiver ON.Turn
counterclockwise until a click sounds, to switch the
transceiver OFF. Rotate to adjust the volume level.
PC MODE
Preface
The transceiver is programmed by using a personal
computer, programming interface (KPG-22) and programming
software (KPG-55D).
The programming software can be used with an IBM PC or
compatible. Figure 1 shows the setup of an IBM PC for
programming.
Connenction procedure
1. Connect the TK-3107 to the personal computer with the
interface cable.
2. When data is transmitting from the transceiver the red LED
lights.
When data is received by the transceiver the green LED
lights.
Notes:
• The data stored in the personal computer must match the
Model Name when it is written into the EEPROM.
• Do not press the [PTT] key during data transmission or
reception.
REALIGNMENT

3
TK-3107
REALIGNMENT
Gray SP
MIC
Gray/Black
1.5D-XV Lead wire
Gray-XV Shield wire
Tuning cable
(E30-3216-05)
KPG-22
ANT
RF Power meter
or SSG
KPG-55D
IBM-PC
-
+
-
+
}
}
Fig. 1
• KPG-22 description
(PC programming interface cable: Option)
The KPG-22 is required to interface the TK-3107 with the
computer. It has a circuit in its D-subconnector (25-pin) case
that converts the RS-232C Iogic level to the TTL Ievel. The
KPG-22 connects the side panel jacks of the TK-3107 to the
computer's RS-232C serial port.
• Programming software description
The KPG-55D Programming Disk is supplied in 3-1/2" the disk
format. The Software on this disk allows a user to program the
TK-3107 radios via a Programming interface cable (KPG-22).
• Programming with IBM PC
If data is transferred to the transceiver from an IBM PC with
the KPG-55D, the destination data (basic radio information)
for each set can be modified. Normally, it is not necessary to
modify the destination data because their values are
determined automatically when the frequency range
(frequency type) is set.
The values should be modified only if necessary.
Data can be programmed into the EEPROM in RS-232C
format via the SP MIC plug.
In this mode the PTT Iine operates as TXD and RXD data lines
respectively.

4
TK-3107
Separating the chassis from the unit
1. Remove the eleven screws ❻.
2. Remove the solder from the antenna terminal using a
soldering iron then lift the unit off ❼.
3. Remove the two screws ❽and remove the antenna
connector.
Note : When reassembling the unit in the chassis, be sure to
solder the antenna terminal.
DISASSEMBLY FOR REPAIR
Separating the case assembly from the chassis
1. Remove the two knobs ❶and three round nuts ❷.
2. Remove the two screws ❸.
3. Expand the right and left sides of the bottom of the case
assembly, Iift the chassis, and remove it from the case
assembly ❹.
4. Taking care not to cut the speaker lead ➎, open the chassis
and case assembly.
Lever knob
Cace assembly
Antenna terminal
Removing the lever
1. Raise the lever on the lower case ➒, insert a small flat
screwdriver into the space between the case and lever,
open the case carefully ➓ and lift the lever off.
Note : Do not force to separate the case from the lever.

5
TK-3107
1.Frequency configuration
The receiver utilizes double conversion. The first IF is
38.85MHz and the second IF is 450kHz. The first local
oscillator signal is supplied from the PLL circuit.
The PLL circuit in the transmitter generates the necessary
frequencies. Fig. 1 shows the frequencies.
CIRCUIT DESCRIPTION
ANT
ANT SW RF
AMP
MCF
CF
IF SYSTEM AF
AMP
RX
TX
PA
AMP TX
AMP
PLL
VCO MIC AMP
TCXO
X3
multiply
38.85MHz
450kHz
38.4MHz
12.8MHz
SP
MIC
Fig. 1 Frequency configuration
2.Receiver
The receiver is double conversion superheterodyne,
designed to operate in the frequency range of 470 to 490MHz.
The frequency configuration is shown in Fig. 1.
1) Front - end RF amplifier
An incoming signal from the antenna is applied to an RF
amplifier (Q203) after passing through a transmit/receive
switch circuit (D102 and D103 are off) and a 3-pole LC filter.
After the signal is amplified (Q203), the signal is filtered by a
band pass filter (a 3-pole LC filter) to eliminate unwanted
signals before it is passed to the first mixer.
The voltage of these diodes are controlled by to track the MPU
(IC403) center frequency of the band pass filter. (See Fig. 2)
Fig. 2 Receiver section configuration
Item Rating
Nominal center frequency 38.850MHz
Pass band width ±5.0kHz or more at 3dB
40dB stop band width ±20.0kHz or less
Ripple 1.0dB or less
Insertion loss 4.0dB or less
Guaranteed attenuation 80dB or more at fo -910kHz
Terminal impedance 610 / 3PF
Item Rating
Nominal center frequency 450kHz
6dB band width ±6.0kHz or more
50dB band width ±12.5kHz or less
Ripple 2.0dB or less at fo ±4kHz
Insertion loss 6.0dB or less
Guaranteed attenuation 35.0dB or more at fo ±100kHz
Terminal impedance 2.0 k
XF201:L71-0522-05
CF200:L72-0958-05
2) First Mixer
The signal from the RF amplifier is heterodyned with the
first local oscillator signal from the PLL frequency synthesizer
circuit at the first mixer (Q202) to create a 38.85MHz first
intermediate frequency (1st IF) signal. The first IF signal is
then fed through two monolithic crystal filters (MCFs : XF201)
to further remove spurious signals.
3) IF amplifier
The first IF signal is amplified by Q201, and then enters
IC200 (FM processing IC). The signal is heterodyned again
with a second local oscillator signal within IC200 to create a
450kHz second IF signal. The second IF signal is then fed
through a 450kHz ceramic filter (CF200) to further eliminate
unwanted signals before it is amplified and FM detected in
IC200.
4) AF amplifier
The recovered AF signal obtained from IC200 is amplified
by IC300 (1/4), filtered by the IC300 low-pass filter (2/4) and
IC300 high-pass filter (3/4) and (4/4), and de-emphasized by
R303 and C306. The AF signal is then passed through a
WIDE/NARROW switch (Q303). The processed AF signal
passes through an AF volume control and is amplified to a
sufficient level to drive a loud speaker by an AF power
amplifier (IC302).
ANT
D102,D103
BPF
L208~L211
APC
TUNE
RF AMP
Q203
BPF
L214,L203,L204 MIXER
Q202
MCF
XF201 IF AMP Q201
CF200
IF, MIX, DET
IC200 AF AMP
LPF, HPF
IC300
AF PA AMP
IC302
SP
WIDE/NARROW SW
Q303
X3
multiply
Q1
IC403
MPU
TCXO
1st Local OSC
(PLL)
ANT SW

6
TK-3107
2) VCO
The operating frequency is generated by Q4 in transmit
mode and Q3 in receive mode. The oscillator frequency is
controlled by applying the VCO control voltage, obtained from
the phase comparator, to the varactor diodes (D2 and D4 in
transmit mode and D1 and D3 in receive mode). The T/R pin is
set high in receive mode causing Q5 and Q7 to turn Q4 off,
and turn Q3 on . The T/R pin is set low in transmit mode. The
outputs from Q3 and Q4 are amplified by Q6 and sent to the
buffer amplifiers.
5) Squelch
Part of the AF signal from the IC enters the FM IC again,
and the noise component is amplified and rectified by a filter
and an amplifier to produce a DC voltage corresponding to the
noise level.
The DC signal from the FM IC goes to the analog port of the
microprocessor (IC403). IC403 determines whether to output
sounds from the speaker by checking whether the input
voltage is higher or lower than the preset value.
To output sounds from the speaker, IC403 sends a high signal
to the MUTE and AFCO Iines and turns IC302 on through
Q302, Q304, Q305, Q306 and Q307.(See Fig. 3)
3.PLL frequency synthesizer
The PLL circuit generates the first local oscillator signal for
reception and the RF signal for transmission.
1) PLL
The frequency step of the PLL circuit is 5 or 6.25kHz.
A 12.8MHz reference oscillator signal is divided at IC1 by a fixed
counter to produce the 5 or 6.25kHz reference frequency. The
voltage controlled oscillator (VCO) output signal is buffer
amplified by Q6, then divided in IC1 by a dual-module
programmable counter . The divided signal is compared in phase
with the 5 or 6.25kHz reference signal in the phase comparator in
IC1. The output signal from the phase comparator is filtrered
through a low-pass filter and passed to the VCO to control the
oscillator frequency. (See Fig.4)
FM IF IC IC200
IF AMP DET
DET HPF
AMP
LPF
IC301
QT/DQT Q303
W/N SW
IC403
MPU
BUSY
MUTE AFCO
TI
6 5 67 62
AF AMP
IC300
LPF HPF Q302
SW IC302
AF PAAMP Q307
SW
SW
SP
Q304, 305, 306
CIRCUIT DESCRIPTION
6) Receive signaling
QT/DQT
300 Hz and higher audio frequencies of the output signal
from IF IC are cut by a low-pass filter (IC301). The resulting
signal enters the microprocessor (IC403). IC403 determines
whether the QT or DQT matches the preset value, and
controls the MUTE and AFCO and the speaker output sounds
according to the squelch results.
Fig. 4 PLL circuit
PLL DATA
12.8MHz
REF OSC
I/M
I/N
PLL IC IC1
PHASE
COMPARATOR CHARGE
PUMP
LPF
5kHz/6.25kHz D2, 4
D1, 3
Q4
TX VCO
Q3
RX VCO
Q6
BUFF AMP
Q2
RF AMP
Q5, 7
T/R SW
5kHz/6.25kHz
Fig. 3 AF Amplifier and squelch

7
TK-3107
4. Transmitter
1) Transmit audio
The modulation signal from the microphone is amplified by
IC500 (1/2), passes through a preemphasis circuit, and
amplified by the other IC500 (1/2) to perform IDC operation.
The signal then passes through a low-pass filter (splatter fiIter)
(Q501 and Q502) and cuts 3kHz and higher frequencies. The
resulting signal goes to the VCO through the VCO modulation
terminal for direct FM modulation. (See Fig. 6)
2) QT/DQT encoder
A necessary signal for QT/DQT encoding is generated by
IC403 and FM-modulated to the PLL reference signal. Since
the reference OSC does not modulate the loop characteristic
frequency or higher, modulation is performed at the VCO side
by adjusting the balance. (See Fig. 6)
CIRCUIT DESCRIPTION
Fig. 6 Transmit audio QT/DQT
MUTE
VR501
MAX
DEV
BALANCE
X1, IC1
D5, Q4
VCO
REFERENCE
OSC
(TCXO)
MIC
IC500 (1/2)
MIC
AMP IC500 (1/2)
IDC
Q503
SW
PREEMPHASIS
Q501, 502
LPF
(SPLATTER FILTER)
IC403
TO QT/DQT
VR500
3) VCO and RF amplifier
The transmit signal obtained from the VCO buffer amplifier
Q100, is amplified by Q101 and Q102. This amplified signal is
passed to the power amplifier, Q105 and Q107, which
consists of a 2-stage FET amplifier and is capable of
producing up to 4W of RF power. (See Fig.7)
4) ANTswitchandLPF
The RF amplifier output signal is passed through a low-
pass filter network and a transmit/receive switching circuit
before it is passed to the antenna terminal. The transmit/
receive switching circuit is comprised of D101, D102 and
D103. D102 and D103 are turned on (conductive) in transmit
mode and off (isolated) in receive mode.
Fig. 7 APC system
AMP
Q101,Q102 DRIVE AMP
Q105
5T
B
Q103, Q104
B SW
DET
IC100
APC
5T
Q109 SW
Q106
SW
APC
5T
Q108
SW RX
D102,103
ANT SW
FINAL AMP
Q107 ANT SW
D101 LPF
ANT
5T
SW
Q110
TH102
5) APC
The automatic power control (APC) circuit stabilizes the
transmitter output power at a predetermined level by sensing
the drain current of the final amplifier Field Effect Transistor
(FET) . The voltage comparator, IC100 (2/2), compares the
voltage obtained from the above drain current with a reference
voltage which is set using the microprocessor. An APC
voltage proportional to the difference between the sensed
voltage and the reference voltage appears at the output of
IC100 (1/2). This output voltage controls the gate of the FET
power amplifier, which keeps the transmitter output power
constant. The transmitter output power can be varied by the
microprocessor which in turn changes the reference voltage
and hence, the output power.
6) Terminal protection circuit
When the thermistor (TH102) reaches about 80˚C, the
protection circuit turns on Q110 to protect transmitting final
amplifier (Q107) from the over heating.
5. Power supply
A 5V reference power supply [5M] for the control circuit is
derived from an internal battery. This reference is used to
provide a 5V supply in transmit mode [5T], a 5V supply in
receive mode [5R], and a 5V supply common in both modes
[5C] based on the control signal sent from the microprocessor.
6. Control system
The IC403 CPU operates at 7.37MHz . This oscillator has a
circuit that shifts the frequency according to the EEPROM
data.
3) UNLOCK DETECTOR
If a pulse signal appears at the LD pin of IC1, an unlock
condition occurs, and the DC voltage obtained from D7, R6,
and C1 causes the voltage applied to the UL pin of the
microprocessor to go low. When the microprocessor detects
this condition, the transmitter is disabled, ignoring the push-to-
talk switch input signal. ( See Fig.5)
Fig. 5 Unlock detector circuit
IC1
LD
PLL IC
D7
C1
R6
5C
IC403
UL
MPU

8
TK-3107 SEMICONDUCTOR DATA
Microprocessor: M38267M8L241GP (IC403)
Pin No. I/O Port Name Function
59 O NC NC
60 O NC NC
61 O 5MC
Control of power supply (5M) for
everything except the
microcomputer and EEPROM L
: Power supply ON
62 O AFCO AF amp power suppIy H : ON
63 O RX TX/RX VCO select H : RX
64 O GLED Green LED control H : Lit
65 O RLED RED LED control H : Lit
66 O SAVE Save control H : Save off
67 O MUTE Mute control H : Mic mute
L : AF mute
68 O 5RC Reception power suppIy control
L : on
69 O 5TC Transmission power suppIy control
H : on
70 O NC NC
71 O NC NC
72 O NC NC
73 O NC NC
74 O NC NC
75 O NC NC
76 O NC NC
77 O NC NC
78 O NC NC
79 O NC NC
80 O NC NC
81 O NC NC
82 O NC NC
83 O NC NC
84 O NC NC
85 O NC NC
86 O NC NC
87 O NC NC
88 O NC NC
89 l VCC Microcomputer power supply, 5V input
90 l VREF A/D conversion reference voltage ;
connected to Vcc
91 l AVSS A/D converter power supply ;
connected to Vss
92 O NC NC
93 O NC NC
94 O NC NC
95 O NC NC
96 I NC NC
97 l NC NC
98 I NC NC
99 I NC NC
100 I NC NC
FET : 2SK2596(Q105)
Absolute Maximum Ratings (Ta=25°C)
Item VDSS VGSS IDPch* Tch Tstg
Rating 17V ±10V 0.4A 3W 150°C -45~+150°C
*Tc=25°C
FET : 2SK2595(Q107)
Absolute Maximum Ratings (Ta=25°C)
Item VDS VGSS IDPch* Tch Tstg
Rating 17V ±10V 1.1A 20W 150°C -45~+150°C
*Tc=25°C
Pin No. I/O Port Name Function
1 O VC1 NC
2 O VC2 NC
3 I NC NC
4 I TIBI QT/DQT external circuit center
point input
5 I TI QT/DQT signal input
6 I BUSY Busy input
7 l BATT Battery voltage detection
8 l NC NC
9 O VCCN Frequency regulation output
10 O APC/TUNE TX : Auto power control D/A output
RX : BPF tuning D/A output
11 I NC NC
12 I NC NC
13 l NC NC
14 l NC NC
15 O BEEP Beep output
16 O TO QT/DQT output
17 l NC NC
18 I PTT [PTT] key input Connected to RXD
19 O TXD RS-232C output Connected to SP/
MIC test(REM)
20 I RXD RS-232C input Connected to [PTT]
line
21 l NC NC
22 I SELF Self program L:disable
23 I MONl [MONl] key input
24 I NC NC
25 I NC NC
26 I NC NC
27 l NC NC
28 l ENC3 Encode input (channel select)
29 l ENC2 Encode input (channel select)
30 l ENC1 Encode input (channel select)
31 l ENC0 Encode input (channel select)
32 l INTO Power detection control
33 I RST Reset input
34 I NC NC
35 O NC NC
36 l XIN 7.3728MHz oscillator
37 O XOUT 7.3728MHz oscillator
38 I VSS GND
39 O SHIFT Beat shift H:shift on
40 O PABC Final supply H : on
41 O WNRC Audio reference sensitivity
L : narrow
42 O WNTC MAX Dev. Control Narrow: H
43 l NC NC
44 l NC NC
45 I NC NC
46 l NC NC
47 l/O SDA EEPROM data line
48 O SCL EEPROM clock line
49 I UL PLL unlock detection pin L : unlock
50 l NC NC
51 I NC NC
52 I NC NC
53 l NC NC
54 I NC NC
55 O DT Common data output
56 O CK Common clock output
57 O NC NC
58 O LE PLL IC enable H : Iatches

9
TK-3107
DESCRIPTION OF COMPONENTS
Ref No. Semiconductor Description
IC1 IC PHASE LOCKED LOOP
SYSTEM
IC100 IC AUTOMATICPOWERCONTROL
IC200 IC IF SYSTEM
IC300 IC AUDIO AMP ACTIVE FILTER
IC301 IC ACTIVE FILTER
IC302 IC AUDIO POWER AMP
IC400 IC RESET SWITCH
IC401 IC EEPROM
IC402 IC VOLTAGE DETECT
IC403 IC MICRO PROCESSOR
IC404 IC VOLTAG E REGULATER
IC500 IC MIC AMP/LIMITER
Q1 TRANSISTOR TRIPLER
Q2 TRANSISTOR RF AMP
Q3 FET VCO RX
Q4 TRANSISTOR VCO TX
Q5 FET DC SWITCH
Q6 TRANSISTOR RF BUFFER AMP
Q7 TRANSISTOR DC SWITCH
Q8 TRANSISTOR RIPPLE FILTER
Q100 TRANSISTOR RF AMP
Q101 TRANSISTOR TX PRE-DRIVE
Q102 FET TX DRIVE
Q103 FET DC SWITCH
Q104 TRANSISTOR DC SWITCH
Q105 FET TX DRIVE
Q106 FET DC SWITCH
Q107 FET TX FAINAL
Q108,109 TRANSISTOR DC SWITCH
Q110 TRANSISTOR TEMPERATURE
PROTECTION SWITCH
Q200 TRANSISTOR DC SWITCH
Q201 TRANSISTOR IF AMP
Q202 FET MIXER
Q203 FET MIXER RF AMP
Q300 TRANSISTOR ACTIVE FILTER
Q302 FET AUDIO MUTE SWITCH
Q303-306 TRANSISTOR DC SWITCH
Q307 FET AUDIO MUTE SWITCH
Q400-402 TRANSISTOR DC SWITCH
Q403 TRANSISTOR BEAT SHIFT SWITCH
Q404 TRANSISTOR DC SWITCH
Q405 FET DC SWITCH
Q406-408 TRANSISTOR DC SWITCH
Q500 FET DC SWITCH
Q501,502 TRANSISTOR ACTIVE FILTER
Q503 TRANSISTOR MIC MUTE/ AGC
Q504 TRANSISTOR DC SWITCH
D1-4 VARIABLE CAPACITANCE
DIODE FREQ.CONTROL
D5 VARIABLE CAPACITANCE
DIODE TX MODULATION
D6 DIODE CURRENT STEERING
D7 DIODE UNLOCKDETECT
D100 DIODE RF SWITCH
D101-103 DIODE ANTENNA SWITCH
D200 DIODE RF SWITCH
D201-205
VARIABLE CAPACITANCE
DIODE BPF TUNING
D300 DIODE LIMITER
D400 LED TX
D401 LED BUSY
D500 DIODE AGC DETECT
D501 DIODE MIC MUTE/AGC SWITCH
D502 DIODE REVERSE PROTECTION

10
TK-3107
TK-260 :K, K2
PARTS LIST