© 2001-3 PRINTED IN JAPAN
B51-8423-10 (N) 1023
VHF FM TRANSCEIVER
TK-290
SERVICE MANUAL
Photo is TK-290 K type.
Does not come with antenna.
Antenna is available as an option.
CONTENTS
GENERAL ................................................................. 2
SYSTEM SET-UP ..................................................... 2
OPERATING FEATURES ......................................... 3
REALIGNMENT...................................................... 11
CIRCUIT DESCRIPTION ......................................... 17
SEMICONDUCTOR DATA..................................... 25
DESCRIPTION OF COMPONENTS ....................... 26
PARTS LIST ............................................................ 28
EXPLODED VIEW .................................................. 36
PACKING ................................................................ 37
DISASSEMBLY FOR REPAIR ................................ 38
ADJUSTMENT ....................................................... 39
PC BOARD VIEWS
FINAL UNIT (X45-3592-71) ............................... 50
CONTROL UNIT (X53-3930-XX)....................... 51
TX-RX UNIT (X57-5390-10) .............................. 55
SCHEMATIC DIAGRAM ........................................ 61
BLOCK DIAGRAM.................................................. 67
LEVEL DIAGRAM ................................................... 69
TERMINAL FUNCTION .......................................... 70
KNB-17A (Ni-Cd BATTERY) ................................... 71
KMC-25/26 (SPEAKER MICROPHONE) ................ 72
KSC-19 (CHARGER) ................................................ 73
KSC-20 (RAPID CHARGER) .................................... 73
KPG-36 (PROGRAMMING INTERFACE CABLE)
...... 73
KRA-14 (HELICAL ANTENNA) ............................... 73
SPECIFICATIONS............................... BACK COVER
CAUTION
When using an external power connector,
please use with maximum final module protec-
tion of 10V
REVISED
Antenna
(KRA-14 : Option)
Cabinet assy
(A02-2139-63)
Knob assy (SEL)
(K29-5282-04)
Knob assy (VOL)
(K29-5283-04)
Panel assy
(A62-0537-53)
Knob assy
(Side key)
(K29-5441-04)
KENWOOD CORPORATION
14-6, Dogenzaka 1-chome, Shibuya-ku, Tokyo 150-8501, Japan
KENWOOD SERVICE CORPORATION
P.O. BOX 22745, 2201 East Dominguez Street, Long Beach, CA 90801-5745, U.S.A.
KENWOOD ELECTRONICS CANADA INC.
6070 Kestrel Road, Mississauga, Ontario, Canada L5T 1S8
KENWOOD ELECTRONICS DEUTSCHLAND GMBH
Rembrücker Str. 15, 63150 Heusenstamm, Germany
KENWOOD ELECTRONICS BELGIUM N.V.
Mechelsesteenweg 418 B-1930 Zaventem, Belgium
KENWOOD ELECTRONICS FRANCE S.A.
13, Boulevard Ney, 75018 Paris, France
KENWOOD ELECTRONICS U.K. LIMITED
KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB United Kingdom
KENWOOD ELECTRONICS EUROPE B.V.
Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands
KENWOOD ELECTRONICS ITALIA S.p.A.
Via G. Sirtori, 7/9 20129 Milano, Italy
KENWOOD IBERICA S.A.
Bolivia, 239-08020 Barcelona, Spain
KENWOOD ELECTRONICS AUSTRALIA PTY. LTD.
(A.C.N. 001 499 074)
16 Giffnock Avenue, Centrecourt Estate, North Ryde, N.S.W. 2113 Australia
KENWOOD ELECTRONICS (HONG KONG) LTD.
Unit 3712-3724, Level 37, Tower one Metroplaza, 223 Hing Fong Road, Kwai Fong, N.T., Hong Kong
KENWOOD ELECTRONICS TECHNOLOGIES(S) PTE LTD.
Sales Marketing Division
1 Ang Mo Kio Street 63, Singapore 569110
SPECIFICATIONS
GENERAL
Frequency Range ................................................. 136 to 174MHz
Number of Channels ............................................ 160 channels
Channel Spacing .................................................. Wide : 25kHz, 30kHz, Narrow : 12.5kHz, 25kHz
(PLL channel step 5kHz, 6.25kHz, 7.5kHz)
Battery Voltage .................................................... 7.5V DC ±20%
Battery Life .......................................................... 10 hours at 5W (5-5-90 duty cycle)
Temperature Range ............................................. –30°C to +60°C (–22°F to +140°F)
Dimensions and Weight ...................................... 6-3/32" (155mm) H x 2-5/16" (58mm) W x 1-1/2" (38mm) D, 1.25 lbs (565g)
With Keypad Model ........................................ 6-3/32" (155mm) H x 2-5/16" (58mm) W x 1-9/16" (39.5mm) D
RECEIVER (Measurements made per EIA standard EIA-603)
Sensitivity
EIA 12dB SINAD ............................................. 0.25µV
20dB Quieting ................................................. 0.35µV
Selectivity ............................................................ Wide : –75dB, Narrow : –70dB
Intermodulation.................................................... Wide : –75dB, Narrow : –68dB
Spurious and Image Rejection............................. –75dB
Audio Power Output ............................................ 500mW at less than 3% distortion
Frequency Stability .............................................. ±0.00025% from –30°C to +60°C
Channel Frequency Spread ................................. 38MHz
TRANSMITTER ( Measurements made per EIA standard EIA-603)
RF Power Output ................................................. Hi : 5W, Low : 1W
Spurious and Harmonics...................................... –70dB
Type of Emission ................................................. F3E, ±5kHz for 100% at 1000Hz
FM Noise ............................................................. Wide : –45dB, Narrow : –40dB
Audio Distortion ................................................... Less than 3.0% at 1000Hz
Frequency Stability .............................................. ±0.00025% from –30°C to +60°C
Channel Frequency Spread ................................. 38MHz
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