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Kenwood TK-7108 Service Manual

Kenwood TK-7108
74 pages
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SERVICE MANUAL /
 !
© 2003-11 PRINTED IN JAPAN
B51-8592-10
(
N
)
621
VHF FM TRANSCEIVER / VHF

TK-7108
Panel assy
(A62-0942-03)
Front glass
(B10-2753-03)
Cabinet
(A01-2178-02)
Key top
(K29-9065-01)
Modular jack
(E08-0877-05)
GENERAL .................................................. 2
SYSTEM SET-UP ...................................... 5
OPERATING FEATURES .......................... 6
REALIGNMENT ....................................... 13
INSTALLATION ....................................... 19
DISASSEMBLY FOR REPAIR ................. 23
CIRCUIT DESCRIPTION .......................... 24
SEMICONDUCTOR DATA ...................... 32
COMPONENTS DESCRIPTION .............. 34
PARTS LIST ............................................. 36
EXPLODED VIEW.................................... 42
CONTENTS
REVISED /

This service manual applies to products with 50800001 or
subsequent serial numbers.
In terms of the products with the serial numbers earlier
than 50800001, refer to the TK-7108 service manual as per
part No. B51-8592-00 or B51-8636-00.
PACKING ................................................. 43
ADJUSTMENT ........................................ 45
TERMINAL FUNCTION ........................... 52
PC BOARD
DISPLAY UNIT (X54-3460-20) ............ 54
TX-RX UNIT (X57-6913-01) ................ 56
SCHEMATIC DIAGRAM.......................... 60
BLOCK DIAGRAM ................................... 64
LEVEL DIAGRAM .................................... 66
SPECIFICATION ...................................... 68
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Kenwood TK-7108 Specifications

General IconGeneral
frequency range146 to 174MHz
number of channels8 channels
channel spacing25kHz
operating voltage13.6V DC ±15%
current drain on standbyLess than 0.4A
current drain on receiveLess than 1.0A
current drain on transmitLess than 8.0A
operating temperature range–30°C to +60°C
dimensions160 (W) x 43 (H) x 107 (D) mm
weightApprox 1.0kg
Receiver IconReceiver
sensitivity (12dB SINAD) wide0.28µV
sensitivity (12dB SINAD) narrow0.35µV
selectivity wide75dB
selectivity narrow65dB
intermodulation wide70dB
intermodulation narrow60dB
spurious response75dB
audio power output4.0W
frequency stability±2.5ppm
Transmitter IconTransmitter
RF power output25W
spurious and harmonics70dB
modulation wide16K0F3E
modulation narrow11K0F3E
FM noise wide45dB
FM noise narrow40dB
audio distortionLess than 3%
frequency stability±2.5ppm

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