Kenwood TK 481 Service Manual
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2 TK-480/481 GENERAL / SYSTEM SET-UP INTRODUCTION SCOPE OF THIS MANUAL This manual is intended for use by experienced techni- cians familiar with similar types of commercial grade com- munications equipment. It contains all required service in- formation for the equipment and is current as of this publica- tion date. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions, which are issued as required. ORDERING REPLACEMENT PARTS When ordering replacement parts or equipment informa- tion, the full part identification number should be included. This applies to all parts : components, kits, and chassis. If the part number is not known, include the chassis or kit number of which it is a part and a sufficient description of the required component, for proper identification. PERSONNEL SAFETY The following precautions are recommended for person- nel safety : - DO NOT transmit until all RF connectors are secure and any open connectors are properly terminated.- SHUT OFF this equipment when near electrical blasting caps or while in an explosive atmosphere. - This equipment should be serviced by only qualified tech- nicians. SERVICE This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and align- ment procedures contained within. NOTE WE CANNOT guarantee oscillator stability when using channel elements manufactured by companies other than KENWOOD or its authorized agents. You must use the KPG-49D to program TK-480/481 trans- ceivers with a serial number of 30100001 or greater. You cannot use the KPG-35D for those radios. TK-480/481 transceivers with a serial number of 30100001 or greater have a red triangle in the KENWOOD logo label (B43-1139-04) on the front panel. You will also find the model name plate marked as Ver 2.0 on the rear of the transceiver. Unit TX-RX unit Display unit Model &X57-5630-XX X54-3210-XX Frequency range Remarks QT/DQT DTMF Charger Battery 16 key destination 0-10 0-11 0-10 0-11 TK-480K 806~870MHzIF1 : 44.85MHz Option– K2LOC : 44.395MHz TK-481K 896~941MHzIF1 : 44.85MHz Option– K2LOC : 44.395MHz Note X57-5630-XX/X54-3210-XX : Produced in Singapore Merchandise received License and frequency allocated by FCC Choose the type of transceiver Transceiver programming Are you using the speaker microphone? Delivery TX 806~825 2.5W TK-480 K,K2 851~870 RX 851~870 TX 896~902 TK-481 K,K2 935~941 RX 935~941 Frequency range (MHz) RF power Type A personal computer (IBM PC or compatible), programming interface (KPG-36), and programming software (KPG-49D) are required for programming. (The frequency, trunked system features, conventional system features, TX power HI/LOW, and signaling data are programmed for the transceiver.) YES NO KMC-25 Speaker microphone (Option) SYSTEM SET-UP
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3 TK-480/481 OPERATING FEATURES 1. Operation Features The TK-480/481 is an 800/900MHz band EFJ LTR™-com- patible trunked radio designed to operate in both trunked and conventional modes. The programmable features are summarized. Model Trunking mode Conventional mode This model can handle up to 32 systems with up to 250 groups in each system. The transceiver can be used in both trunked mode and conventional mode. Systems, groups, and their functions are programmed. 2. Transceiver Controls and Indicators 2-1. Physical Layout 5 4 1 2 3Microphone Speaker 6 10 11 12 9 7 8 Note :The transceiver is also available without the DTMF keypad ( ). 2-2. Panel controls The key on the top and front panel is momentary-type push buttons. The functions of these keys and knob are ex- plained below. Antenna connector Connect the supplied antenna here. System or Group selector knob (Programmable) Turning the system (or group) selector knob clockwise increases the system (or group) number by one. Turning the knob in the counterclockwise direction decreases the system (or group) number by one. After the system number (or group number) reaches the highest system number (or group number), it goes back to lowest system number (or group number). System numbers (or group numbers) not set are skipped. Caution : The FPU (KPG-49D) allows selecting between system selector and group selector. Volume/Power switch Transceiver Power and Volume switch. Turn clockwise to switch On the transceiver. Turn counterclockwise fully to switch OFF the transceiver. Also adjusts the volume level. When the power is switched off, all the param- eters, such as the system and group, are stored in memory. When the power is switched on again, the sys- tem returns to the previous conditions. Auxiliary (orange) key (Programmable) Battery pack release catch Push down to release the battery pack. See Installing the Ni-Cd Battery Pack. MONITOR key* (Programmable) PTT (Push-To-Talk) key Press this key, then speak into the microphone to call a station. LAMP key* (Programmable) TX/BATT indicator This red LED lights during transmission (it does not light during busy or when transmit is prohibited). If the battery voltage falls below the programmed voltage during trans- mission, the brightness of this indicator decreases at in- tervals of about one second, so it can be used as the bat- tery voltage alert function. S, A, B, and C key (Programmable) DTMF keypad (keypad model only) Press the keys on the telephone keypad to send DTMF tones. Universal connector Connect the external KMC-25 speaker/ microphone (op- tional) here. Otherwise, keep the supplied cover in place. * : MONITOR and LAMP are arbitrary names chosen for these buttons. They can be used for any of the auxiliary functions. 2-3. Programmable keys The FPU (KPG-49D) enables programmable keys to se- lect the following functions. Auto Tel, AUX(only when Voice Scrambler is not se- lected), DTMF ID (BOT), DTMF ID (EOT), Display Character, Emergency (only AUX key), Function, Group Down, Group Up, Home Group, Key Lock, Lamp, Memory (RCL/STO), Memory (RCL), Memory (STO), Monitor A, Monitor B, Moni- tor C, Monitor D, Redial, RF Power Lo, Scan, Scan Del/Add, Scan Temporary Delete, Scrambler (Only when Voice Scrambler is selected), SP Attenuation (Only MIC switch), System Down, System Up, TEL Disconnect and none. These functions the FPU programs to the function keys are described in the following sections.
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31 TK-480/481 PACKING C D 1 2 3 50 Battery assy (W09-0900-35) Insulation sheet 28 Packing fixture (H12-3014-02) 47 Whip antenna (T90-0636-25) : TK-480 (T90-0640-25) : TK-481 29 Item carton case (H52-1096-12) : TK-480 (H52-1097-12) : TK-481 7 Warranty card (B46-0470-00) 9 Instruction manual (B62-1483-00) 4 Cap (SP/MIC) (B09-0363-03) 42 Screw set (N99-2004-05) 32 Hook (J29-0658-05)
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TK-480/481 KENWOOD CORPORATION14-6, Dogenzaka 1-chome, Shibuya-ku, Tokyo 150-8501, Japan KENWOOD SERVICE CORPORATIONP.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 GMBHRembrücker 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. LIMITEDKENWOOD 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