Transcript
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VHF FM TR
TKSERVICE M
U L © 2000-05 PRINTED IN JAPAN B51-8536-00(S) 200
Antenna (T90-0733-05):M3
Knob (CHANNEL SELECTOR) (K29-5278-03)
Knob(VOLUME) (K29-5255-03)
CONTENTS GENERAL .................................................................. 2 REALIGNMENT ......................................................... 2 DISASSEMBLY FOR REPAIR ................................... 4 CIRCUIT DESCRIPTION ........................................... 5 SEMICONDUCTOR DATA ......................................... 9 DESCRIPTION OF COMPONENTS ........................ 10 PARTS LIST ............................................................. 11 EXPLODED VIEW ................................................... 17 PACKING ................................................................. 18
Cabinet assy (A02-2448-13)
ADJUSTMENT......................................................... 19 PC BOARD VIEWS TX-RX UNIT (X57-6020-21) ................................ 23 SCHEMATIC DIAGRAM .......................................... 27 BLOCK DIAGRAM .................................................. 31 LEVEL DIAGRAM ................................................... 33 KNB-15A (Ni-Cd BATTERY) ................................... 34
TK-2107 (16 channels)
SPECIFICATIONS ................................ BACK COVER
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TK-2107 CIRCUIT DESCRIPTION 1. Frequency configuration The PLL circuit in the transmitter generates the necessary frequencies. Fig. 1 shows the frequencies.
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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.
an ua l
ANT
MCF
RF AMP
IF SYSTEM 38 85MHz
ere pa i
rm
ANT SW
CF 450kHz
SP
38.4MHz X3 multiply
ic
AF AMP
TCXO
12 8MHz
se rv
RX PA AMP
TX AMP
PLL VCO
MIC AMP
MIC
TX
Fig. 1 Frequency configuration
2. Receiver The receiver is double conversion superheterodyne, designed to operate in the frequency range of 216 to 223MHz (M3 type). 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 band pass filter (L208, L209 and L210). After the signal is amplified (Q203),
the signal is filtered through a band pass filter (L203 and L214) to eliminate unwanted signals before it is passed to the first mixer. (See Fig. 2) CF200
ANT
D102, D103
BPF
RF AMP Q203
BPF
MIXER Q202
MCF XF200
IF AMP Q201
AF PA AMP IC302 IF, MIX, DET IC200
ANT SW
TCXO
AF AMP LPF, HPF IC300
SP
X3 multiply Q1
1st Local OSC (PLL)
Fig. 2 Receiver section configuration 2) First Mixer
4) AF amplifier
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 : XF200) to further remove spurious signals.
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 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).
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. 5
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TK-2107
PC BOARD VIEW
1
TX-RX UNIT (X57-6020-21) Component Side View 2
C416
AF I O
C410
G
IC404
C414 R540 8
C407
Q402 Q403 R412
L400
R506 L402
VR501
100
6
C412 L403 X400
26
TH500
R404
3
5 1
1 5
3
4 IC402
R411
IC400 4
R408
8
R407
C504
R400
C403
R509
C533
R513
R518
VR1
R501
C404
C500
R548
BAL C333
R331
C331
C400
R418
C411
9
MIC
Q306
Q304
C332
R500
R413
R505
VR500 R330
1
6
R332 C330
25
R339
R333
MIC500
10
G C336
R503 R504
IC302
R310
Q307
D
C327
Q305
R327 5
C334
R334 C335
R335
R336
C337
S Q108
C130
Q106
an R124
irm
R125
R144
Q109
pa R143
R145 R142
R409 C409
C415
om C127
R531
R137
R134
5
7
R146
se
rv
R135
R133
C132
C134
R141
R138 C141
IC100 4
ic ere
1
R140
R136
5
Q504 R508
C510
C508
R515
C413 IC403
Q501
C408
50
1
l.c Q107
5
8 C139
R132
ua
Q104
C112 R130
R131
R126 L118
R119 Q103
C115
1
4
Q502 R542
C505
DEV
R522
R514
C507
R512
R523
C509
C511
R521
R526
R527
B
5
C513
R511 R510
R517
C519
4
R520
8 C517
C515
IC500
1
R519
CN400
C420 D400
4
R405
51
76
C514
R532
R533
C526
L500
C525
C425
VHF
C520 R528
R516 C512
1
R401
R507
75
C516 R524
R415
R416
3
L401
C521 R525 C518
D401
C524
R529
10
R414
C522
R530 D501
5
R423
R421
6
Q503
R430
C418
R431
C422
R417
D500
R6
C502
F500
IC401
R502 C503
C523
R538
C501
R535
CV
C529
J72-0686-02
C527
C531
R537
R534 R539
L502
R536 C530
R541
R122
Address 8F 8L 7Q 4P 8Q 6O 4R 6I 7E 8E 8H 8H 8I 8G 9M 8M 9K 9K 5Q 6Q 6L 6K 5G 4O 5C 5C 4H 5H
SB
Ref. NO. IC100 IC302 IC400 IC401 IC402 IC403 IC404 IC500 Q103 Q104 Q106 Q107 Q108 Q109 Q304 Q305 Q306 Q307 Q402 Q403 Q501 Q502 Q503 Q504 D400 D401 D500 D501
C417
TX-RX UNIT (X57-6020-21) Component Side View
10
M38267M8L241GP Component side Pattern 1 Pattern 2 Pattern 3 Pattern 4 Foil side
UMC4
DTA114EE DTA114YE DTA123JE DTA143ZE DTA144EE DTC114EE DTC114TE DTC144EE 2SA1362 2SC4617 2SC5108
2SC4988
FP210 B1
DA221
MB15A02 11
C1
EC B2
C2
12
B E C
13
23
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