KENWOOD TK-5210 Service Manual pages

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VHF APCO P2
TKSERVICE MANUAL
© 2004-11 PRINTED IN JAPAN
B51-8703-00 (S) 658
Helical Antenna
(KRA-22: Option)
Helical Antenna
(KRA-22: Option)
Knob (16CH)
(K29-9323-03)
Knob (Volume)
(K29-9322-03)
Helical Antenna
(KRA-22: Option)
Knob (16CH)
(K29-9323-03)
Knob (Volume)
(K29-9322-03)
Knob (Volume)
(K29-9322-03)
Key top
(EMG)
(K29-9319-03)
Key top
(EMG)
(K29-9319-03)
Knob (PTT)
(K29-9328-02)
Knob (16CH)
(K29-9323-03)
Knob (PTT)
(K29-9328-02)
Key top
(EMG)
(K29-9319-03)
Knob (PTT)
(K29-9328-02)
Key top
(4key)
(K29-9320-03)
Main cabinet
(A02-3875-01)
Main cabinet
(4key)
(A02-3877-01)
TK-5210 K
Main cabinet
(DTMF)
(A02-3879-01)
TK-5210 K2
Key top
(DTMF)
(K29-9321-13)
TK-5210 K3
Does not come with antenna. Antenna is available as an option.
CONTENTS
GENERAL ............................................................... 2
SYSTEM SET-UP ................................................... 2
REALIGNMENT ...................................................... 3
DISASSEMBLY FOR REPAIR ................................ 8
CIRCUIT DESCRIPTION ....................................... 13
TERMINAL FUNCTION ........................................ 19
SEMICONDUCTOR DATA ................................... 23
COMPONENTS DESCRIPTION ........................... 25
PARTS LIST .......................................................... 27
EXPLODED VIEW ................................................. 37
PACKING .............................................................. 39
ADJUSTMENT ..................................................... 40
PC BOARD
TX-RX UNIT (X57-6820-XX) ........................... 54
SCHEMATIC DIAGRAM ....................................... 62
INTERCONNECTION DIAGRAM ......................... 74
BLOCK DIAGRAM ................................................ 75
LEVEL DIAGRAM ................................................. 78
OPTIONAL ACCESSORIES
KNB-31A/32N/33L .......................................... 79
KSC-32 ............................................................. 79
SPECIFICATIONS .............................. BACK COVER
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TK-5210
CIRCUIT DESCRIPTION
1. Overview
This transceiver is a VHF/FM/APCO portable transceiver
designed to operate in the frequency range of 136 to
174MHz.
The unit consists of receiver, transmitter, phase-locked
loop (PLL) frequency synthesizer, base band parts, power
supply, and control circuits.
2nd IF of 450KHz. The 450KHz signal is then passed through
a ceramic filter (CF201) and fed back into IC204 for additional
amplification.
L201
BPF
Q202
LNA
L202
BPF
L204
BPF
L205
IC202
BPF 1st MIXER
1st Local OSC
TUNE
2. Frequency Configuration
XF201
MCF
The receiver is a double-conversion superheterodyne
using first intermediate frequency (IF) of 49.95MHz and
second IF of 450kHz. Incoming signals from the antenna are
mixed with the local signal from the PLL circuit to produce
the first IF of 49.95MHz.
This is then mixed with the 50.4MHz second local
oscillator output to produce the 450kHz second IF. This
signal is detected to give the demodulated signal in the DSP.
The transmit signal frequency is generated by the PLL
VCO, and modulated by the signal from the DSP. It is then
amplified and fed to the antenna.
ANT
CF
450kHz
TX/RX : 136~174MHz
SP
MCF
om
1st MIX
MX
IF AMP
RF
AMP
ANT
SW
ua
l.c
49.95MHz
16.8MHz x3
an
VCXO
PA
AMP
pa
TX
AMP
50.4MHz
irm
185 95~
223.95MHz
-re
136~174MHz
FPGA
A/D
D/A
DSP
PLL
VCO
MIC
MIC
AMP
Frequency configuration
se
rv
i
ce
Fig. 1
AF
AMP
3. Receiver System
3-1. Front-end RF Amplifier
The signal is passed through an antenna matching coil,
where the high-frequency components are amplified by a
GaAs FET(Q202). The signals are then fed into band-pass
filter that uses varactor diode tuning to reject unwanted
signal components, and is fed to the 1st mixer.
3-3. IF Amplifier
The 1st IF signal is amplified by the IF amplifier (Q204) and
fed into the FM IC (IC204). The IF signal is then mixed with
the 2nd local oscillator frequency of 50.4MHz to generate the
IC204
FM IC
2nd Local OSC
49.95MHz
CF201
Tripler Q205
X3
X201
VCXO 16.8MHz
Fig. 2
Receiver section
3-4. Wide/ Narrow/ APCO Switching Circuit
Narrow and Wide and APCO settings can be made for
each channel by switching the ceramic filters CF203 (Wide),
CF204 (Narrow), CF202 (APCO).
The Wide and Narrow and APCO data is output from pin54
(WN) and pin55 (VN) of CPU (IC5).
When a Wide data (VN : low level, WN : high level) is
received, the 450KHz signal is passed through a ceramic filter
(CF203). When a Narrow data (VN : low level, WN : low level)
is received, the 450KHz signal is passed through a ceramic
filter (CF204). When a APCO data (VN : high level, WN : high
level) is received, the 450KHz signal is passed through a
ceramic filter (CF202).
If the 450kHz signal is a FM signal(Wide, Narrow), the
signal is detected by a ceramic discriminator (CD201). AF
signal is fed to CODEC(IC406), the AF level is adjusted and it
is output from 15pin of IC406. Q209 turns on/off with the
Wide/Narrow data and the IC204 detector output level is
changed to maintain a constant output level during Wide or
Narrow signals.
If the 450kHz signal is an APCO signal, the signal is
prepared by the buffer amplifier (IC208) and fed to FPGA
(IC13). The APCO signal is A/D-converted by the FPGA and
DSP (IC8), and is performed APCO demodulation.
The AF signal is output from 15pin of CODEC (IC406).
VN WN
H
L
L
H
H
L
Filter
CF202
APCO
Wide
Narrow
APCO
IC203
IC205
CF204
Narrow
IC207
IC206
CF201
3-2. 1st Mixer
The 1st mixer uses the GaAs IC (IC202). The 1st mixer
mixes the signal with the 1st local oscillator frequency from
the VCO, and converts it to the 1st IF (49.95MHz).
The signal then passes through monolithic crystal filter
(XF201) to remove unnecessary nearby frequency
components. The signal from the MCF is used as the 1st IF
signal.
Q204
IF AMP
AF
CF203
VN
VN
WN
450kHz
Wide
CD201 APCO
CD
WN
DET
49.95MHz
50.4MHz
Fig. 3
IC204
FM IC
Q205
X201
VCXO
x3
16.8MHz
Wide/Narrow/APCO switching circuit
13
A
1
B
C
TK-5210
D
E
F
G
H
I
J
PC BOARD
TX-RX UNIT (X57-6820-XX) (B/5) : Control section
-10 : K -11 : K2 -12 : K3 Component side view (J72-0926-19 B/5)
2
S4
D
S5
3
D706
R756
D713
R723
3
4
S3
C
D723
5
S6
2
S2
B
R719
D705
S7
1
S1
A
R721
irm
an
INT
INT
INT
INT
1 INT
7
ua
6 INT MIC–
MIC+
SP+
SP+
SP–
SP–
l.c
CN603
D709
om
6
re
pa
8
rv
ic
e-
J72-0926-19 B/5
TX-RX UNIT (X57-6820-XX) (C/5) : Top section
-10 : K -11 : K2 -12 : K3 Component side view (J72-0926-19 C/5)
se
9
10
Ref. No. Address
D901
11
S901
12
D901
S902
13
J72-0926-19 C/5
58
14
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13B
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