Kenwood-TK-780-H-Service-Manual电路原理图.pdf
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1、 2001-5 PRINTED IN JAPANB51-8581-00 (N)1370VHF FM TRANSCEIVERTK-780/HSERVICE MANUALGENERAL . 2OPERATING FEATURES . 3REALIGNMENT. 15INSTALLATION. 20CIRCUIT DESCRIPTION. 28SEMICONDUCTOR DATA . 33DESCRIPTION OF COMPONENTS . 35PARTS LIST. 37EXPLODED VIEW . 47PACKING . 48ADJUSTMENT . 49PC BOARD VIEWSPLL/
2、VCO (X58-4540-11) : K2,HK2 . 57PLL/VCO (X58-4712-70) : K,HK . 58TX-RX UNIT (X57-6480-XX) (A/2) . 59TX-RX UNIT (X57-6480-XX) (B/2). 65SCHEMATIC DIAGRAM . 69BLOCK DIAGRAM. 77LEVEL DIAGRAM. 80TERMINAL FUNCTION . 82SPECIFICATIONS. 83CONTENTSMicrophone(T91-0621-05)Cabinet (Top)(A01-2165-13)Panel assy(A62
3、-0991-03)Key top(K29-5284-02)SUPPLEMENTThis service manual applied to products with 30200001 or subsequent serial numbers.In terms of the products with the serial numbers earier than 30200001, refer to the TK-780/Hservice manual as per part No. B51-8461-10.2TK-780/HGENERALINTRODUCTIONSCOPE OF THIS M
4、ANUALThis manual is intended for use by experienced techni-cians familiar with similar types of commercial grade com-munications equipment. It contains all required service infor-mation for the equipment and is current as of this publica-tion date. Changes which may occur after publication arecovere
5、d by either Service Bulletins or Manual Revisions,which are issued as required.ORDERING REPLACEMENT PARTSWhen ordering replacement parts or equipment informa-tion, the full part identification number should be included.This applies to all parts : components, kits, and chassis. Ifthe part number is n
6、ot known, include the chassis or kitnumber of which it is a part and a sufficient description ofthe required component, for proper identification.PERSONNEL SAFETYThe following precautions are recommended for person-nel safety : DO NOT transmit if someone is within two feet (0.6meter) of the antenna.
7、 DO NOT transmit until all RF connectors are secure andany open connectors are properly terminated. SHUT OFF this equipment when near electrical blastingcaps or while in an explosive atmosphere. All equipment should be properly grounded beforepower-up for safe operation. This equipment should be ser
8、viced by only qualified tech-nicians.PRE-INSTALLATION CONSIDERNATIONS1. UNPACKINGUnpack the radio from its shipping container and checkfor accessory items. If any item is missing, please contactKENWOOD immediately.2. LICENSING REQUIREMENTSFederal regulations require a station license for each ra-dio
9、 installation (mobile or base) be obtained by the equip-ment owner. The licensee is responsible for ensuring trans-mitter power, frequency, and deviation are within the limitspermitted by the station license.Transmitter adjustments may be performed only by a li-censed technician holding an FCC first
10、, second or generalclass commercial radiotelephone operators license. Thereis no license required to install or operate the radio.3. PRE-INSTALLATION CHECKOUT3-1. IntroductionEach radio is adjusted and tested before shipment. How-ever, it is recommended that receiver and transmitter opera-tion be ch
11、ecked for proper operation before installation.3-2. TestingThe radio should be tested complete with all cabling andaccessories as they will be connected in the final installa-tion. Transmitter frequency, deviation, and power outputshould be checked, as should receiver sensitivity, squelchoperation,
12、and audio output. QT equipment operationshould be verified.4. PLANNING THE INSTALLATION4-1. GeneralInspect the vehicle and determine how and where theradio antenna and accessories will be mounted.Plan cable runs for protection against pinching or crush-ing wiring, and radio installation to prevent o
13、verheating.4-2. AntennaThe favored location for an antenna is in the center of alarge, flat conductive area, usually at the roof center. Thetrunk lid is preferred, bond the trunk lid and vehicle chassisusing ground straps to ensure the lid is at chassis ground.4-3. RadioThe universal mount bracket a
14、llows the radio to bemounted in a variety of ways. Be sure the mounting surfaceis adequate to support the radios weight. Allow sufficientspace around the radio for air cooling. Position the radioclose enough to the vehicle operator to permit easy accessto the controls when driving.4-4. DC Power and
15、wiring1. This radio may be installed in negative ground electricalsystems only. Reverse polarity will cause the cable fuseto blow. Check the vehicle ground polarity before installa-tion to prevent wasted time and effort.2. You must connect the positive power lead directly tothe positive terminal of
16、the vehicle battery. Neverconnect the lead to any other positive power source,such as a cigarette lighter jack or fuse terminals.CAUTIONIf DC power is to be controlled by the vehicle ignitionswitch, a switching relay should be used to switch the posi-tive power lead. The vehicle ignition switch then
17、 controlsDC to the relay coil.3. You must also connect the ground lead directly tothe negative terminal of the vehicle battery.4. The cable provided with the radio is sufficient to handlethe maximum radio current demand. If the cable must beextended, be sure the additional wire is sufficient for the
18、current to be carried and length of the added lead.3TK-780/H5. INSTALLATION PLANNING CONTROL STATIONS5-1. Antenna systemControl station. The antenna system selection dependson many factors and is beyond the scope of this manual.Your KENWOOD dealer can help you select an antenna sys-tem that will bes
19、t serve your particular needs.5-2. Radio locationSelect a convenient location for your control station radiowhich is as close as practical to the antenna cable entrypoint. Secondly, use your systems power supply (whichsupplies the voltage and current required for your system).Make sure sufficient ai
20、r can flow around the radio and powersupply to allow adequate cooling.SERVICEThis radio is designed for easy servicing. Refer to theschematic diagrams, printed circuit board views, and align-ment procedures contained in this manual.NoteWhen you modify your radio as described in system set-up, take t
21、he following precaution.The rating of pin 7 (SB) of the accessory connector cable(KCT-19) on the rear of the radio is 13.6V (1A). Insert a 1Afuse if you use the SB pin for external equipment.Accessory connectorcable (KCT-19)If you do not intend to use the 3.5-mm jack for the exter-nal speaker, fit t
22、he supplied speaker-jack cap (B09-0235-05)to stop dust and sand getting in.GENERAL / OPERATING FEATURESSpeaker-jack cap(B09-0235-05)1. Operation FeaturesThe TK-780/780H is a VHF FM radio designed to operatein both trunking format (LTR model) and conventional for-mat (Conventional model). The program
23、mable features aresummarized.Model Trunking format Trunking modeConventional format Conventional mode1-1. Trunking FormatThis format can handle up to 32 systems with up to 250groups in each system. The transceiver can be used in bothtrunked mode and conventional mode. Systems, groups,and their funct
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