Kenwood_TK-790_B_H_HB_serv_2001.pdf

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1、 2001-6 PRINTED IN JAPAN B51-8438-10 (N) 1234 VHF FM TRANSCEIVER TK-790/(B) TK-790H(B) SERVICE MANUAL Cabinet (Upper) (A01-2161-02) Cabinet (Upper) (A01-2163-01) Panel assy (A62-0606-13) Panel assy (A62-0607-13) Cabinet (Lower) (A01-2164-01) Knob (K29-4664-04) x 2 Cabinet (Lower) (A01-2162-02) Knob

2、(K29-4664-04) x 2 TK-790 or TK-790(B) with KCH-10 KCH-11 TK-790H(B) This service manual applies to products with 30300001 or subsequent serial numbers. (KCH-10 and KCH-11 are applicable to the productions June 2001 and after.) In terms of the products with the serial numbers earier than 30300001, re

3、fer to the TK-790/(B)/H(B) service manual as per part No. B51-8438-00 and the TK-790(B) service manual as per part No. B51-8456-00. REVISED 2 TK-790/(B)/H(B) CONTENTS / GENERAL GENERAL . 2 SYSTEM SET-UP . 4 OPERATING FEATURES . 5 INSTALLATION. 16 DISASSEMBLY FOR REPAIR . 22 CIRCUIT DESCRIPTION. 26 S

4、EMICONDUCTOR DATA. 32 DESCRIPTION OF COMPONENTS . 36 PARTS LIST. 39 EXPLODED VIEW . 57 PACKING . 61 ADJUSTMENT . 65 TERMINAL FUNCTION . 74 WIRING . 77 PC BOARD VIEWS / CIRCUIT DIAGRAMS DISPLAY UNIT (X54-3190-20) : KCH-10 . 79 DISPLAY UNIT (X54-3200-20) : KCH-11 . 81 CONTROL UNIT (X57-5610-XX) (B/3)

5、. 87 FINAL UNIT (X57-5610-XX) (C/3) : TK-790/(B). 97 TX-RX UNIT (X57-5610-XX) (A/3) . 101 FINAL UNIT (X45-3560-10) : TK-790H(B) . 113 BLOCK DIAGRAM. 117 SPECIFICATIONS. 119 GENERAL INTRODUCTION SCOPE OF THIS MANUAL This manual is intended for use by experienced techni- cians familiar with similar ty

6、pes 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. ORDE

7、RING 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 suffici

8、ent description of the required component, for proper identification. PERSONNEL SAFETY The following precautions are recommended for person- nel safety : DO NOT transmit if someone is within two feet (0.6 meter) of the antenna. DO NOT transmit until all RF connectors are secure and any open connecto

9、rs are properly terminated. SHUT OFF this equipment when near electrical blasting caps or while in an explosive atmosphere. All equipment should be properly grounded before power-up for safe operation. This equipment should be serviced by only qualified tech- nicians. 3 TK-790/(B)/H(B) PRE-INSTALLAT

10、ION CONSIDERATIONS 1. UNPACKING Unpack the radio from its shipping container and check for accessory items. If any item is missing, please contact KENWOOD immediately. 2. LICENSING REQUIREMENTS Federal regulations require a station license for each ra- dio installation (mobile or base) be obtained b

11、y the equip- ment owner. The licensee is responsible for ensuring trans- mitter power, frequency, and deviation are within the limits permitted by the station license. Transmitter adjustments may be performed only by a li- censed technician holding an FCC first, second or general class commercial ra

12、diotelephone operators license. There is no license required to install or operate the radio. 3. PRE-INSTALLATION CHECKOUT 3-1. Introduction Each radio is adjusted and tested before shipment. How- ever, it is recommended that receiver and transmitter opera- tion be checked for proper operation befor

13、e installation. 3-2. Testing The radio should be tested complete with all cabling and accessories as they will be connected in the final installa- tion. Transmitter frequency, deviation, and power output should be checked, as should receiver sensitivity, squelch operation, and audio output. QT equip

14、ment operation should be verified. 4. PLANNING THE INSTALLATION 4-1. General Inspect the vehicle and determine how and where the radio antenna and accessories will be mounted. Plan cable runs for protection against pinching or crush- ing wiring, and radio installation to prevent overheating. 4-2. An

15、tenna The favored location for an antenna is in the center of a large, flat conductive area, usually at the roof center. The trunk lid is preferred, bond the trunk lid and vehicle chassis using ground straps to ensure the lid is at chassis ground. 4-3. Radio The universal mount bracket allows the ra

16、dio to be mounted in a variety of ways. Be sure the mounting surface is adequate to support the radios weight. Allow sufficient space around the radio for air cooling. Position the radio close enough to the vehicle operator to permit easy access to the controls when driving. 4-4. DC Power and wiring

17、 1. This radio may be installed in negative ground electrical systems only. Reverse polarity will cause the cable fuse to blow. Check the vehicle ground polarity before installa- tion to prevent wasted time and effort. 2. Connect the positive power lead directly to the vehicle battery positive termi

18、nal. Connecting the Positive lead to any other positive voltage source in the vehicle is not rec- ommended. 3. The cable provided with the radio is sufficient to handle the maximum radio current demand. If the cable must be extended, be sure the additional wire is sufficient for the current to be ca

19、rried and length of the added lead. 5. INSTALLATION PLANNING CONTROL STATIONS 5-1. Antenna system Control station. The antenna system selection depends on many factors and is beyond the scope of this manual. Your KENWOOD dealer can help you select an antenna sys- tem that will best serve your partic

20、ular needs. 5-2. Radio location Select a convenient location for your control station radio which is as close as practical to the antenna cable entry point. Secondly, use your systems power supply (which supplies the voltage and current required for your system). Make sure sufficient air can flow ar

21、ound the radio and power supply to allow adequate cooling. SERVICE This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and align- ment procedures contained in this manual. GENERAL 4 TK-790/(B)/H(B) Before Reading About System Set-up The TK-790(B)/

22、H(B) is a transceiver main unit (without a panel or speaker) that you complete by adding options. The options are classified into three types according to operation and function. 1. Install the front panel kit (controller) directly on a radio to operate it. (Form : Radio + KCH-10/11) 2. Remotely con

23、trol one radio with one controller. (Form : Radio + KRK-5 + KCH-10/11 + KCT-22M/M2/M3) SYSTEM SET-UP *Service manual parts No. list ModelParts No. KRK-5/6DHB51-8445-00 KRK-7DB/8DBHB51-8452-00 Merchandise received License and frequency allocated by FCC Choose the type of transceiver TK-790/(B), TK-79

24、0H(B) (Radio 1) TK-790(B) or TK-790H(B) is complete by combining options with only the transceiver body (without panel) Are you using the remote kit? KCH-10 (Basic model) Front panel kit KCH-11 (Full featured model) Front panel kit Supplied accessory knob Are you using one radio with two controllers

25、? Are you using one radio with one controller? Are you using two radios with one controller? Are you using two radios with two controllers? TK-790 : Contain (KCH-10) Are you using the printed keytops? KRK-5 Single control head kit KRK-7DB Dual band remote kit KRK-6DH Dual control head kit KCH-10KCH-

26、11KCH-10KCH-11KCH-10 + KCH-10 KCH-10 + KCH-11 KCH-11 + KCH-11 orororor KCT-22M/M2/M3 Control cable YES YES *See Remote kit service manual NO NO See page 16See page 16 See page 16 YES KRK-8DBH Dual band dual control head kit KCH-10 + KCH-10 KCH-10 + KCH-11 KCH-11 + KCH-11 oror YES YES Frequency range

27、 148174MHz 148174MHz YES *See Remote kit service manual Are you using the voice scrambler? Transceiver programming (option) Are you using the external speaker? KCT-23 (DC cable) Are you using the ignition sense cable? Delivery Modified of control unit YES NO NO NO KES-4 (EXT. SP) YES KCT-18 YES See

28、page 18 See page 18 See page 17 See page 13 A personal computer (IBM PC or compatible), programming interface (KPG-43), and programming software (KPG-44D) are required for programming. (The frequency and signalling data are programmed for the transceiver.) See Installation manual KCT-23 M,M3 : TK-79

29、0/(B), KCT-23 M2,M4 : TK-790H(B) RF power 45W 110W TK-790/(B) F1 136156MHz45WTK-790(B) F2 TK-790H(B) F1 Type 3. Remotely control one radio with two controllers. (Form : Radio + KRK-6DH + KCH-10/11 (two) + KCT-22M/M2/ M3 (two) 4. Remotely control two radios with one controller. (Form : Radios (two) +

30、 KRK-7DB + KCH-10/11 + KCT-22M/M2/ M3) 5. Remotely control two radios with two controllers. (Form : Radio (two) + KRK-8DBH + KCH-10/11 (two) + KCT- 22M/M2/M3 (two) 5 TK-790/(B)/H(B) 1.Controls and Functions 1-1. Basic Function Panel (1) POWER Switch Press to turn the power ON and OFF. (2) TX/BUSY In

31、dicator The TX Indicator (Red LED) shows that you are transmit- ting. The BUSY Indicator (Green LED) shows that the channel is in use. (3) Microphone Connector (4) Volume Knob To increase the volume level, turn clockwise (CW). To decrease the volume level, turn counterclockwise (CCW). (5) UP/DOWN Kn

32、ob The function of this Knob can be programmed by the FPU. FunctionDescriptionNote ChannelChannel selector.Default UP/DOWNTo increase the channel, turn CW.setting. To decrease the channel, turn CCW. GroupGroup selector. UP/DOWNTo increase the group, turn CW. To decrease the group, turn CCW. (6) GR U

33、P Key, (7) GR DW Key, (8) MON Key, (9) SCN Key, (10)(18) PF1-9 Key The function of these Keys can be programmed by the FPU. FunctionDescriptionNote : Key top name NoNo function.Default setting Functionof PF19. MonitorIf MON is pressed once whileDefault setting MONthe RADIO is waiting for reception,o

34、f MON. (Full all signalling* squelch is canceled.function panel) If MON is held down for 2 seconds,all singalling; noise squelch is canceled and theQT/DQT however, no RADIO transmission takes place. If PA is pressed again, a confirmation tone will sound, the display will return to the normal channel

35、 or SCAN display, and the PA function will turn off. 11. Speaker Internal/External (SP) SP amplifies the received audio from the RADIO and out- puts it through a PA speaker. SP is activated by pressing the SP Key. A confirmation tone sounds and the SP icon is dis- played. SP can be activated at anyt

36、ime (scanning or non- scanning). The RADIO transmits and operates normally while SP is activated, but all received calls will be output through the PA speaker. If SP is pressed again, a confirmation tone sounds, the SP icon goes off and the SP function will turn off. 12. Channel Name (AN) This funct

37、ion switches the 13-segment display (BASIC Panel) or DOT MATRIX (L) display (FULL Panel) between al- phanumeric and Group-Channel number. If you want to change from alphanumeric display to chan- nel display, press AN Key. A confirmation tone sounds, and the alphanumeric display changes to the channe

38、l display. If AN is pressed again, a confirmation tone sounds, and the channel display changes back to the alphanumeric dis- play. 13. Intercom (IC) ; Dual Head Configuration only Intercom (IC) allows one control head operator to talk to the another control head operator. IC mode is activated by pre

39、ssing the IC Key. A confirmation tone sounds and the display shows INTERCOM. IC can be activated at any- time (scanning or non-scanning). The RADIO continues to scan however, no RADIO transmission takes place. If IC is pressed again, a confirmation tone sounds, the display returns to the normal chan

40、nel or SCAN display, and the IC function will turn off. 14. Home Channel (HC) This feature allows the radio operator to immediately se- lect a pre-determined “Home Channel” by pressing the HC Key. HC can be activated as follows. CASE1 : HC has been set as “HC (Fixed)” Non-ScanScanningScan Modetempor

41、ary stopping press HC onceChange to Home Channel press HC againNo effect CASE2 : HC has been set as “HC (Toggle)” Non-ScanScanningScan Modetemporary stopping press HC onceChange to Home Channel press HC againReturn toChange toReturn to current channelRevert Channelcurrent channel 15. Squelch Level (

42、SQL) This function allows the radio operator to manually adjust the squelch threshold in 16 steps (Level 015) via the front panel controls. To adjust the squelch level: (1) Press the SQL Key. A confirmation tone sounds, and the RADIO enters Squelch Level Adjust Mode. In this mode, all signallings ar

43、e canceled and audio is unmuted. The display shows SQUELCH XX (or SQL XX). (XX= squelch level) (2) Change the squelch level by pressing and Keys, or rotating the UP/DOWN Knob. (3) Press SQL again. A confirmation tone sounds, the dis- play returns to the normal channel, the level setting is memorized, and Squelch Level Adjust Mode will turn