Kenwood TKR-851 Operating manual

Document Copyrights
Copyright 2006 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.

© 2004-10 PRINTED IN JAPAN
B51-8701-00 (N)935
UHF FM REPEATER
TKR-851
SERVICE MANUAL
UHF FM REPEATER TKR-851
Front panel
(A62-0934-03)
Knob (DC source)
(K29-9106-04)
Key top
(K29-5460-02)
Knob (Volume)
(K29-5389-03)
Modular jack
(E08-0877-05)
Antenna cable (N)
(E30-7528-05)
Antenna cable (BNC)
(E30-3418-05)
TEST/SPKR connector assy
(E37-0913-05)
D-sub cable assy
(E37-0904-05)
DC backup terminal
(E70-0402-05)
DC cord (Ext DC in)
(E30-3414-05)
Fuse (Blade, 10A/32V)
(F06-1032-05) x 2
SUPPLEMENT
This supplement to the service manual is available for products with serial number 60700001 or later.
This service manual contains a parts list, schematic diagrams and PC board of a new final unit for the TKR-851.
Since the adjustment procedure is the same as before, refer to the service manual (B51-8684-00) the TKR-851 for items not
provided in this service manual.
MODIFICATION........................................................................................ 2
PARTS LIST .............................................................................................. 3
EXPLODED VIEW...................................................................................... 5
PC BOARD
FINAL UNIT (X45-3742-71) .................................................................. 6
SCHEMATIC DIAGRAM......................................................................... 10
CONTENTS

TKR-851
2
MODIFICATION
3-2. Connection
1. Solder the prepared coaxial cable to the final unit.
2. Connect the pin connector of the coaxial cable to CN18 of
the TX-RX unit.
3-3. Setting the FPU
Set the channel to be used as “Simplex” using the FPU.
Fig. 5
3. Single Antenna
The TKR-851 can be used as a base station by sharing an
external antenna connector for both transmitting and receiv-
ing data.
3-1. Modification
1. Change the installation position of C81 and C160 of the
final unit using a soldering iron.
Fig. 3
2. Short-circuit the printed pattern of ANT SW near the CN3
connector by soldering.
3. Disconnect the pin connector from CN18 of the TX-RX
unit.
Remove the two screws used for securing the BNC con-
nector on the back panel of the unit. Detach the antenna
cable assy. (E30-3418-05)
4. Cut off the coaxial cable of the removed antenna cable
assy on the BNC connector side.
Strip off the insulation of the cut-off coaxial cable to pre-
pare it to be soldered.
Strip off the insulation so that
the cable can be soldered.
Cut off the coaxial cable
at this point.
About 20mm
About
8~10mm
Fig. 4
CN16
CN18
TX-RX unit (A/2)
Component side
Route the coaxial
cable under the lead
wire extending from
CN3 and CN16.
Style the coaxial cable as
illustrated in the figure.
Solder the coaxial
cable.
CN3 ERX
Final unit (A/2)
Component side
C81
CN3
ANT SW
FWD
C160
C160
C81
E
RX
CN53
Final unit (A/2)
Component side

TKR-851
3
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation
New
parts
Ref. No. Address Parts No. Description Desti-
nation
New
parts
TKR-851 (Y54-323X-XX)
FINAL UNIT (X45-3742-71)
✽New Parts. indicates safety critical components.
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
L: Scandinavia K:USA P:Canada
Y: PX (Far East, Hawaii) T:England E:Europe
Y:AAFES (Europe) X:Australia M:Other Areas
51 1B G02-0894-04 EARTH SPRING
64 1B J21-8467-04 MOUNTING HARDWARE
C1 CK73GB1H471K CHIP C 470PF K
C3 C90-2146-05 ELECTRO 100UF 25WV
C6,7 CK73GB1H471K CHIP C 470PF K
C8 CC73GCH1H080D CHIP C 8.0PF D
C10 CK73GB1H471K CHIP C 470PF K
C12-15 CK73GB1H471K CHIP C 470PF K
C17 CC73GCH1H050C CHIP C 5.0PF C
C18,19 CK73GB1H471K CHIP C 470PF K
C20 CK73FB1H471K CHIP C 470PF K
C21 CC73FCH1H120J CHIP C 12PF J
C22 CC73FCH1H060D CHIP C 6.0PF D
C23 CK73FB1H471K CHIP C 470PF K
C24 ✽C90-5640-05 ELECTRO 100UF 16WV
C26 CC73GCH1H471J CHIP C 470PF J
C27 CK73GB1H471K CHIP C 470PF K
C28 CK73FB1E104K CHIP C 0.10UF K
C29 CK73GB1H471K CHIP C 470PF K
C30 CK73FB1E224K CHIP C 0.22UF K
C31 C93-0599-05 CHIP C 470PF K
C32 C93-0558-05 CHIP C 8.0PF D
C33,34 C93-0565-05 CHIP C 27PF J
C35 C93-0599-05 CHIP C 470PF K
C36 CK73FB1E104K CHIP C 0.10UF K
C38 CK73GB1H471K CHIP C 470PF K
C39 C93-0561-05 CHIP C 12PF J
C40 C93-0564-05 CHIP C 22PF J
C41 C93-0599-05 CHIP C 470PF K
C42 CC73FCH1H220J CHIP C 22PF J
C43 CM73F2H220J CHIP C 22PF J
C44 C93-0556-05 CHIP C 6.0PF D
C46 C93-0599-05 CHIP C 470PF K
C48 CK73GB1H471K CHIP C 470PF K
C49 CC73GCH1H101J CHIP C 100PF J
C50 CK73FB1E104K CHIP C 0.10UF K
C51 C90-2143-05 ELECTRO 47UF 25WV
C52 CC73GCH1H101J CHIP C 100PF J
C53 CK73FB1E104K CHIP C 0.10UF K
C54 C90-2146-05 ELECTRO 100UF 25WV
C55 C93-0599-05 CHIP C 470PF K
C56 CC73FCH1H220J CHIP C 22PF J
C59 CM73F2H150J CHIP C 15PF J
C61 CM73F2H820J CHIP C 82PF J
C68 CK73GB1H471K CHIP C 470PF K
C69 CC73GCH1H101J CHIP C 100PF J
C70 CK73FB1E104K CHIP C 0.10UF K
C71,72 CK73GB1H471K CHIP C 470PF K
C75 CK73GB1H471K CHIP C 470PF K
C77 CC73GCH1H101J CHIP C 100PF J
TKR-851 C78 CK73GB1H471K CHIP C 470PF K
C79 CK73FB1E104K CHIP C 0.10UF K
C80 C92-0777-05 ELECTRO 1000UF 25WV
C81 CM73F2H820J CHIP C 82PF J
C83 C93-0556-05 CHIP C 6.0PF D
C86 C93-0560-05 CHIP C 10PF D
C89 C93-0555-05 CHIP C 5.0PF C
C91-98 CK73GB1H471K CHIP C 470PF K
C99 CK73FB1E104K CHIP C 0.10UF K
C100-102 CK73GB1H471K CHIP C 470PF K
C103 C92-0628-05 CHIP-TAN 10UF 10WV
C104 CC73GCH1H101J CHIP C 100PF J
C105 CK73GB1H471K CHIP C 470PF K
C106 CK73FB1E104K CHIP C 0.10UF K
C107 CC73GCH1H101J CHIP C 100PF J
C108 CK73FB1E104K CHIP C 0.10UF K
C109 CC73GCH1H101J CHIP C 100PF J
C112 CK73GB1H471K CHIP C 470PF K
C113 CK73FB1E104K CHIP C 0.10UF K
C114 CK73GB1H471K CHIP C 470PF K
C115 CK73FB1E104K CHIP C 0.10UF K
C116 CK73GB1H471K CHIP C 470PF K
C117 CK73FB1E104K CHIP C 0.10UF K
C118 C93-0558-05 CHIP C 8.0PF D
C119 CK73GB1H471K CHIP C 470PF K
C120 CK73FB1H223K CHIP C 0.022UF K
C121,122 CM73F2H150J CHIP C 15PF J
C123,124 CM73F2H220J CHIP C 22PF J
C155 C93-0599-05 CHIP C 470PF K
C157 CK73GB1H471K CHIP C 470PF K
C160 CM73F2H820J CHIP C 82PF J
C161 CC73GCH1H220J CHIP C 22PF J
C165,166 CK73FB1H471K CHIP C 470PF K
C167,168 CC73GCH1H220J CHIP C 22PF J
C169 CC73FCH1H560J CHIP C 56PF J
C170-172 CC73GCH1H220J CHIP C 22PF J
C173,174 CC73FCH1H220J CHIP C 22PF J
C177 CC73FCH1H150J CHIP C 15PF J
C178 C93-0553-05 CHIP C 3.0PF C
C179 CC73FCH1H030C CHIP C 3.0PF C
CN1 E04-0154-05 PIN SOCKET
CN3 E40-5632-05 PIN ASSY
CN4 E40-3246-05 PIN ASSY
CN5 E40-5703-05 PIN ASSY
CN6-8 E23-0462-05 TERMINAL
F1 F53-0217-05 FUSE
CN51,52 J13-0071-05 FUSE HOLDER
L1 L40-1075-92 SMALL FIXED INDUCTOR (10NH/1608)
L2 L40-1075-34 SMALL FIXED INDUCTOR (10NH/8)
L3 L40-1875-92 SMALL FIXED INDUCTOR (18NH/1608)
L5 L41-6865-20 SMALL FIXED INDUCTOR
L6,7 L34-4517-05 AIR-CORE COIL
L9 L34-4517-05 AIR-CORE COIL
L11 L34-4517-05 AIR-CORE COIL
FINAL UNIT (X45-3742-71)

TKR-851
4
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation
New
parts
Ref. No. Address Parts No. Description Desti-
nation
New
parts
L12 L34-4523-05 AIR-CORE COIL
L14 L40-1575-34 SMALL FIXED INDUCTOR (15NH/8)
L15 L40-1075-34 SMALL FIXED INDUCTOR (10NH/8)
L16 L40-1075-92 SMALL FIXED INDUCTOR (10NH/1608)
L17 L40-1875-92 SMALL FIXED INDUCTOR (18NH/1608)
L19 L34-4667-05 AIR-CORE COIL
L20 L34-4758-05 AIR-CORE COIL
R1 RK73GB1J103J CHIP R 10K J 1/16W
R2 RK73GB1J222J CHIP R 2.2K J 1/16W
R3 RK73GB1J470J CHIP R 47 J 1/16W
R4 RK73GB1J220J CHIP R 22 J 1/16W
R6 RK73GB1J470J CHIP R 47 J 1/16W
R7 RK73GB1J682J CHIP R 6.8K J 1/16W
R8 RK73FB2A100J CHIP R 10 J 1/10W
R9 RK73FB2A220J CHIP R 22 J 1/10W
R11 RK73GB1J104J CHIP R 100K J 1/16W
R12 RK73GB1J183J CHIP R 18K J 1/16W
R13 RK73FB2A470J CHIP R 47 J 1/10W
R14 R92-2571-05 CHIP R 270 J 1/2W
R15 R92-1259-05 CHIP R 18 J 1/2W
R16 R92-2571-05 CHIP R 270 J 1/2W
R17 RK73FB2A124J CHIP R 120K J 1/10W
R18 RK73EB2B101J CHIP R 100 J 1/8W
R19 RK73FB2A104J CHIP R 100K J 1/10W
R20,21 R92-1252-05 CHIP R 0 OHM J 1/16W
R22 R92-1213-05 CHIP R 100 J 1/2W
R23 RK73FB2A124J CHIP R 120K J 1/10W
R24 RK73FB2A104J CHIP R 100K J 1/10W
R26 RK73GB1J101J CHIP R 100 J 1/16W
R31 RK73GB1J224J CHIP R 220K J 1/16W
R34 R92-1252-05 CHIP R 0 OHM J 1/16W
R35 RK73GB1J104J CHIP R 100K J 1/16W
R36 R92-1252-05 CHIP R 0 OHM J 1/16W
R37 R92-0670-05 CHIP R 0 OHM
R38 RK73GB1J473J CHIP R 47K J 1/16W
R40 R92-1204-05 CHIP R 100 J 1/4W
R41,42 R92-1252-05 CHIP R 0 OHM J 1/16W
R44 R92-0670-05 CHIP R 0 OHM
R45 RK73GB1J223J CHIP R 22K J 1/16W
R46 RK73GB1J471J CHIP R 470 J 1/16W
R47 RK73GB1J222J CHIP R 2.2K J 1/16W
R48 RK73GB1J471J CHIP R 470 J 1/16W
R49 R92-1217-05 CHIP R 0 OHM
R50 R92-1317-05 CHIP R 18 J 1W
R54 RK73GB1J102J CHIP R 1.0K J 1/16W
R55 RK73GB1J474J CHIP R 470K J 1/16W
R56 RK73GB1J473J CHIP R 47K J 1/16W
R57 RK73GB1J471J CHIP R 470 J 1/16W
R58 RK73GB1J474J CHIP R 470K J 1/16W
R59 R92-1252-05 CHIP R 0 OHM J 1/16W
R60 RK73GB1J103J CHIP R 10K J 1/16W
R61 R92-2687-05 RESISTOR 5.6 J 5W
R62 RK73GB1J103J CHIP R 10K J 1/16W
R70 R92-1252-05 CHIP R 0 OHM J 1/16W
R71 R92-1214-05 CHIP R 120 J 1/2W
R72 RK73GB1J184J CHIP R 180K J 1/16W
R73 R92-1204-05 CHIP R 100 J 1/4W
R77 RK73GB1J154J CHIP R 150K J 1/16W
VR1 R12-6429-05 TRIMMING POT. (100K/12)
FINAL UNIT (X45-3742-71)
K1 S76-0426-05 RELAY
D2 02DZ6.2(Y) ZENER DIODE
D4,5 HSM88AS DIODE
D7 ZSA5A27 ZENER DIODE
D8 RB051L-40 DIODE
D9 MINISMDC050-02 VARISTOR
D10 1SS355 DIODE
D51,52 DSA3A1 DIODE
D53 MA4PH633 DIODE
D55,56 MA4PH633 DIODE
IC1 MAX6502UKP035 ANALOGUE IC
IC2 NJM78L05UA BI-POLAR IC
IC3 TA75W01FU MOS-IC
Q1 2SC5110(O) TRANSISTOR
Q2 2SC3356(R24) TRANSISTOR
Q3 2SK2596 FET
Q4 PD55008S DRIVE FET
Q5 RD60HUF1-01 FINAL FET
Q8 2SC4116(Y) TRANSISTOR
Q9 DTD123EK DIGITAL TRANSISTOR
TH1 PTH9M04BE471TS THERMISTOR

TKR-851
5
Parts with the exploded numbers larger than 700 are not supplied.
EXPLODED VIEW
3
2
1
BA
43
44
50
29
64
51
20 19
27
25
26
1
Dx3
Nx2
Px11
L
Lx2
Dx3
Final
(B/2)
Final
(A/2)
D M4 x 14 : N30-4014-46
L M3 x 8 : N67-3008-46
N M2.6 x 6 (Br-Tap) : N87-2606-46
P M3 x 6 (Br-Tap) : N87-3006-46

6
JIHGFEDCBA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
C20
C21
C22
C23
C24
C26
C31 C32
C33
C34
C35
C36
C38
C40
C39 C41
C4
3
C51
C69
C70
C80
C1
C3
C6 C7
C8
D2
D7
D8
D9
F1
K1
L1
L2
L3
L5
L6
L14
L15
CN51
CN52
D51
D52
IC3
C119
C120
R11
R12
R13 8T 8T
R14
R15
R16
R17
R18
R19
R20 R21
Q1
Q2
R26
Q3
D
S
G
R1
R2 R3 R4
R8
R9
R46
R47
R48
R49
R55 R5
9
R61
R62
C12 C13 C14 C17
GND
+B2
GND
+B1
Main DC Back up battery
J72-0971-19 (B/2)
+B1
GND
+B2
CN6 MAIN DC
(RED)
CN7 BACKUP
(ORANGE)
CN8 GND
(BLACK)
CHARGE
+
CN4
FAB 1
2
FAG
1 3B
B
E
CN5
Vg
++
Q4
GD
+
8T
CN1
TX IN
1
45
8
C169
C173
C25
C42
TKR-851 PC BOARD
FINAL UNIT (X45-3742-71) Component side view (J72-0971-19)
Ref. No. Address
IC3 8J
Q1 9H
Q2 9G
Q3 8F
Ref. No. Address
Q4 6I
Q5 5L
Q8 8K
D2 8I
Ref. No. Address
D4 7P
D5 9Q
D7 3J
D8 6E
Ref. No. Address
D9 6E
D51 7B
D52 8B
D53 8R

7
JKLMNOPQRS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
C27
C28
C29
C30
C40
C43
C44
C46
C48
C54
C55
C59
C61
C69
C70
C71
C72
R42
C75
C81
C83
C86
C89
D4
D5
D7
F1
L7
C166
L9 L11
L12
IC3
C118
C120
C121
C122
8T
C123
C124
R22
R23
R24
26
Q8
R31
C165
R34
R35
R36
L17
R37
R38
L16
R40
R73
R41
R44
R45
VR1
R55
R56
R57
R58
R59
R60
R62
R72
CN3
1
45
8
PDT
TMP
Vg
PC
DET
TH1
Q5
GD
+
1 8GND
NC
8T
PC
FAS
PDT
BUP
TMP
REV
ANT SW
FWD
ANT
J72-0971-19 (A/2)
C42
C56
C160
L19
E
RX
C178
L20
D53
CN53
PC BOARD TKR-851
FINAL UNIT (X45-3742-71) Component side view (J72-0971-19)
Component side
Foil side
Layer 1
Layer 2
Layer 3
Layer 4

JKLMNOPQRSIHGFEDCBA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
C20
C21
C22
C23
C24
C26
C27
C28
C29
C30
C31 C32
C33
C34
C35
C36
C38
C40
C39 C41
C43
C44
C46
C48
C51
C54
C55
C59
C61
C69
C70
C71
C72
R42
C75
C80
C81
C83
C86
C89
C1
C3
C6 C7
C8
D2
D4
D5
D7
D8
D9
F1
K1
L1
L2
L3
L5
L6
L7
C166
L9 L11
L12
L14
L15
CN51
CN52
D51
D52
IC3
C118
C119
C120
C121
R11
R12
C122
R13 8T 8T
C123
R14
C124
R15
R16
R17
R18
R19
R20 R21
R22
R23
R24
Q1
Q2
R26
Q3
D
S
G
Q8
R31
C165
R34
R1
R35
R2
R36
L17
R3
R37
R4
R38
L16
R8
R9
R40
R73
R41
R44
R45
VR1
R46
R47
R48
R49
R55
R56
R57
R58
R59
R60
R61
R62
R72
CN3
C12 C13 C14 C17
GND
+B2
GND
+B1
Main DC Back up battery
J72-0971-19 (B/2)
+B1
GND
+B2
CN6 MAIN DC
(RED)
CN7 BACKUP
(ORANGE)
CN8 GND
(BLACK)
CHARGE
+
CN4
FAB 1
2
FAG
1 3B
B
E
CN5
Vg
++
Q4
GD
+
8T
CN1
TX IN
1
45
8
PDT
TMP
Vg
PC
DET
TH1
Q5
GD
+
1 8GND
NC
8T
PC
FAS
PDT
BUP
TMP
REV
ANT SW
FWD
ANT
J72-0971-19 (A/2)
C169
C173
C25
C42
C56
C160
L19
E
RX
C178
L20
D53
CN53
TKR-851 PC BOARD
FINAL UNIT (X45-3742-71) Component side view (J72-0971-19)
PC BOARD TKR-851
FINAL UNIT (X45-3742-71) Component side view (J72-0971-19)
Ref. No. Address
IC3 8J
Q1 9H
Q2 9G
Q3 8F
Ref. No. Address
Q4 6I
Q5 5L
Q8 8K
D2 8I
Ref. No. Address
D4 7P
D5 9Q
D7 3J
D8 6E
Ref. No. Address
D9 6E
D51 7B
D52 8B
D53 8R
Component side
Foil side
Layer 1
Layer 2
Layer 3
Layer 4

8
JIHGFEDCBA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
C49
C50
C52
C53
C91 C92 C93 C94 C95 C96 C97
IC1
J72-0971-19 (A/2)
1
34
5
C68
D55
D56
C179
R70
C155
C157
R71
C167
C106
C107
C108
C109
R77
TKR-851 PC BOARD
FINAL UNIT (X45-3742-71) Foil side view (J72-0971-19)
Ref. No. Address
IC1 7J
IC2 9O
Q9 8O
D10 8O
Ref. No. Address
D55 6A
D56 7A