Kenwood-TK-941-Service-Manual电路原理图.pdf

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1、1 800MHz/900MHz FM TRANSCEIVER O 1994-8 PRINTED IN JAPAN B51-8281-00( N ) 121 9 C Microphone SERVICE MANUAL BLOCK DIAGRAM . :;.:.:.$:, ,.- “!?$LUCO .ia., “ 66 . LEVEL DIAGRAM . . 2b . . :FX-R%?ONIT 1x57-4590-XXI (BIZ) . 67 . ., , G . . CIRCUIT DESCRIPTION 27 , . “. TX-RX;UNIX-O-XX) (A121 7 1 SEMICON

2、DUCTOR DATA . 34 SCHEM:b 39. SPECIFICA:IONS . :. . 83 . . . ,;-I PARTS LIST . 41 KT-19 (ACCESSORY CONNECTION CABLE1 BACK COVER . , EXPLODED VIEW . 55 . . . KDD-4 (DrMF DECODER) BACK COVER . PACKING . : 56 KPG-25D (PROGRAMMING DISK) . BACK COVER a GENERAL INTRODUCTION SCOPE OF THIS MANUAL ns are reco

3、mmended for This manual i? intended for use by experienced v technicians familiar with similar types of commercial one is within two feet (0.6 grade communications equipment. It contains all re- quired service information for the equipment and is ransmit until all RF connectors are verified current

4、as of the publication data. Changes which may ectors are properly termi- occur after publication are covered by either Service Bulletins or Manual Revisions. These are issued as re- DO NOT operate this equipment quired. lasting caps or in an explosive at- ORDERING REPLACEMENT PARTS properly grounded

5、 before When ordering replacement parts or equipment in- formation, the full part identification number should be erviced by a qualified technician only. included. This applies to all parts : components, kits, or chassis. If the part number is not known, include the chassis or kit number of which it

6、 is a part, and a suffi- cient description of the required component for proper identification. PRE-INSTALLATION 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 REQUIREMEN

7、TS Federal regulations require a station license for each radio installation (mobile or base) be obtained by the equipment owner. The licensee .is responsible for en- ring transmitter power, frequency, and deviation are hin the limits permitted by the station license. ansmitter adjustments may be pe

8、rformed only by nsed technician holding an FCC first, second or ss commercial radiotelephone operators li- re is no license required to install or operate FCC COMPLIANCE AND TYPE NUMBERS 3. PRE-INSTALLATION CHECKOUT 3-1. Introduction Each rado IS adjusted and tested before shipment. However, it is r

9、ecommended that recerver and trans- mitter operation be checked for proper operatron be- fore nstallaton. 3-2. Testing The radio should be tested complete with all cablng and accessories as they wrll be connected In the fnal installatron. Transmrtter frequency, devaton, and power ptput should be che

10、cked, as should recelver gnjtivity, squelch operation, and audio output, Qequiprnent operation should be verifed. Complrance Part 90 Part 90 Type acceptance number ALHTK-940-1 ALHTK-941-1 Frequency range 806-870MHz 896-941 MHz 9401941 E INSTALLATION 5. INSTALLATION PLANNING - CONTROL STATIONS 5-1. A

11、ntenna system e vehicle and determine how and where Control station. The antenna system seecton de- pends on many factors and IS beyond the scope of this cable runs for protection against pinching or manual. Your KENWOOD dealer can help you select g wiring, and radio installation to prevent,over- an

12、 antenna system that will best serve your particular needs. 4-2. Antenna 5-2. Radio location The favored location for an antenna Is In the center Select a convenlent location for your control staton of a large, flat conductve area, usually at the roof ten- rado which is as close as practical to the

13、antenna cable ter The trunk Ild IS preferred, bond the trunk and entry pornt Secondly, use your systems power supply vehicle chassis using ground straps to ensure the Ild 1s (whlch supplles the voltage and current requred for at chassis ground your system) Make sure suffcent air can flow around the

14、rado and power supply to allow adequate coolng 4-3. Radio The universal mount bracket allows the radio to be mounted in a variety of ways. Be sure the mounting surface is adequate to support the radios weight. Al- low sufficient space around the radio for air cooling. Position the radio close enough

15、 to the vehicle operator to permit easy access to the controls when driving. 4-4. DC Power and wiring 1 Ths rado may be nstalled In negatlve ground eec- trcal systems only Reverse polarty will cause the f cable fuse to blow Check the vehcle ground polar- I ty before nstallaton to prevent wasted time

16、 and 1 effort k 2 Connect the posltive power lead drectly to the ve- t i hcle battery postive termnal Connectng the Posi- t tive lead to any other posltlve voltage source In the I. vehcle IS not recommended F If DC power is to be controlled by the vehicle igntion 1 “ switch, a switching relay should

17、 be used to switch the / posltwe power lead The vehcle ignition switch then 1 controls DC to the relay col I 1 3 Connect the ground lead drectly to the battery negatlve termlnal 4 The cable provded wlth the radlo IS suffcent to handle the maximum radio current demand If the cable must be extended, b

18、e sure the additonal wire IS suffcent for the current to be carred and length of the added lead SERVICE This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and alignment procedures contained in this manual. Note When you modify your radio as descr

19、ibed in systern set-up, take the following precaution. The rating of pin 7 (SB) of the accessory connector cable (KCT-19) on the rear of the radio is 13.6V (IA). Insert a 1A fuse if you use the SB pin for external equipment. Accessory connector cable (KCT-19) Fuse (IA) If you do not intend to use th

20、e 3.5-mm jack for the external speaker, fit the supplied speaker-jack cap (B09-0235-XX) to stop dust and sand getting in. Speaker-jack cap (B09-0235-XX) SYSTEM SET-UP Merchandise received P t License and frequency allocated by FCC I Choose the type of transceiver Y- See page 16. Modify the control u

21、nit when used KDD-4. w (The frequency and signaling (option) data are programmed for the transceiver.) Frequency range (MHz) TX 806-825 851 -870 RX 851-870 TX 896-902 935-941 RX 935-941 I See page 21. See page 21. Are you using the external speaker? KES-3 External speaker (Option) 1 (Option) Transce

22、iver programming (Option) See page 18. See page 20. KCT-18 Ignition sense cable N 0 (Option) RF power 15W , 15W See page 13. A personal computer (IBM PC or compatible), programming interface (KPG-4), c Delivery ) Type TK-940 K TK-9,41 K and programming software (KPG-25D) are required for programming

23、. OPERATING FEATURES 1. Operation Featu tes 2. Transceiver Controls and Indicators (Fig. 1) The TK-9401941 s an 8001900MHz-band EFJ LTRIM- 2-1. Font Panel Controls compatble trunked ladlo deslgned to operate In both All the keys on the front panel ale momentary-type trunked and conventona modes The

24、programmable push buttons The functons of these keys are ex- features ale summarlzed plained below 1-1. General Transceiver Features POWER key Any combination of 32 (MAX) trunked and conven- Transceiver POWER key. When the power is tional systems programmable. switched off, all the parameters, such

25、as the system Up to 250 (MAX) groups are programmable in each and group, are stored in memory. When the power is system. switched on again, the system returns to the previous key IS pressed and the a mark appears, scan mode b IS entered Scannng starts from the system followng the currently dlsplayed

26、 system When scannlng, “-SCAN- IS ndcated on the alphanumerlc dlspay When a call IS received, scannlng stops, and the sys- tem and group are dlsplayed When the system or group or volume (AUX) key IS pressed durng scannlng, the scan stops and the revert system or group can be changed Scannlng resumes

27、 one second after the key IS released If the scan feature is not programmed, the “SCAN“ key on the front panel is ineffective. 3-2. System Lockout The system lockout feature IS used to lock systems out of the scan sequence, and can be selected by pro- gramming in the following two ways: Fixed lockou

28、t The system to be locked out is selected by program- ming. When a locked system is selected, the Delete ( ) ) Indicator appears on the left of the SYSTEM indi- cator. The revert system is scanned even if it is locked out. If there is a locked system, the Delete ( b ) indica- tor flashes during fixe

29、d scanning. (It does not light continuously or flash during list type scan.) User selectable lockout If the AUX (Auxiliary) key is programmed for the scan lockout feature, the user can lock systems out of the scan sequence with the AUX key. To lock a system out of the scan sequence, press the AUX ke

30、y when the system is dlsplayed. The Delete ( b ) indicator is displayed on the left of the SYSTEM indicator. To unlock a system, select the system and press the AUX key. The Delete ( ) ) indicator disappears to indicate that the system has returned to the scan se- quence. The revert system is scanne

31、d even if it is locked out. If there a locked system, the Delete ( b indicator flashes during fixed scanning. (It does not light continuously or flash during list type scan.) If all systems are locked out, the scan stops and only the revert system is received. If another function is assigned to the

32、AUX (Auxiliary) key, the USER SELECTABLE LOCKOUT feature does not function. 3-3. Drop-Out Delay Time (Scan Resume Time) If a call IS received during scan, the scan stops The scan resume time can be programmed as 0 to 254 sec- onds In one-second increments The default value IS 3 seconds. 3-4. Dwell T

33、ime The dwell time 1s the time after transmlsslon ends until the scan resumes In scan mode It can be set to 0 to 254 seconds by programmlng The default value 1s 1 5 seconds. OPERATING FEATURES 3-5. SystemIGroup Revert SystemIGroup revert can be programmed for one of the following: Last call revert T

34、he system or group changes to the revert system or group when a call IS received with the system or group being scanned. Last use revert If a systemlgroup call is received during scanning and the PTT button 1s pressed for transmission and re- sponse within the drop out delay time, the system or grou

35、p is assigned as the new revert system or group. 3-6. Scan Message Wait The time for staying wlth the home repeater that receives a signal during system scan and monitoring data messages can be programmed. If there is no sig- nal from the home repeater, the system is scanned for about 50ms. If there

36、 is a signal, three data messages are monitored. Normally, three data messages a re monitored for each system, and it can be increased in multiples of three data messages per line to up to eight lines. If the repeater data message indicates that there is no call, data monitoring is terminated and th

37、e home repeater of the next system is scanned. 3-7. Call Indicator The call lndlcator can be programmed for each group In trunked systems, t can be set to respond to a selectable decode ID or one of two flxed IDS, except block IDS When a call IS recelved wlth a selectable decode ID, the call Indicat

38、or flashes When a call 1s I recelved wlth a flxed ID, the call lndlcator lights con- I 1 tinuously. I In a conventonal system, the call indicator can be 1 programmed to lght for each QT or DQT code It ! keeps flashlng while a call IS belng recelved It IS turned off by presslng any front panel key 3-

39、8. Time-Out Timer 1 The tlme-out timer can be programmed In 15 sec- I onds increments from 15 seconds to ten mlnutes for patch and Interconnect operatons If the transmlt- for longer than the pro- ter IS dlsabled and a warn- PlT button IS held down. he PlT button IS released. ute for dlspatch and thr

40、ee 3-9. Priority ID Codes The priority of the programmable decode ID codes for each system is as follows: 1) Fixed ID code 1 2) Fxed ID code 2 3) Selected ID code 4) Other selectable ID codes (Group scan only) 5) Block decode codes When a call with a higher priority is received, that call is receive

41、d immediately (except when the trans- ceiver is trunked out). 3-10. Group Scan Operation Group scan can be programmed for each group. In addition to the ID codes of the selected group, the ID codes of the other groups that are permitted for group scan are decoded. (The two fixed ID and block decode

42、codes are always decoded.) If, during group scanning, a call is recelved with one of the selectable group ID codes for which group scan is enabled, the group display indicates the group num- ber that the call came in with. That group then be- comes the new selected group. Group scan resumes after th

43、e specified drop-out delay time or dwell time shared by the system scan elapses. 3-1 1. Transmit Inhibit The transceiver can be programmed wlth a transmit inhibit block of ID codes. If an ID code within this block is decoded the preset time before the PTT button is pressed, transmission is inhibited

44、. The BUSY indicator lights and a busy tone sounds until the PTT button is released to indicate that transmission is not possible (except clear-to-talk mode). Transmission with the group for which the encode ID is not set is inhibited, and the busy tone is output while the PTT button is held down, r

45、egardless of the clear-to-talk setting. 3-12. TEL ID Codes (TEL MODE) The ID code in the TEL ID block can be used to make a phone call by programming the block. To make a phone calls, an optional DTMF microphone is required. 1 OPERATING FEATURES 3-13. Free System Ringback ) Thls feature is avalabe o

46、nly when a telephone inter- connect ID code IS selected. If a busy tone sounds when the PTT button IS pressed, the transceiver enters this mode automatcally. When the PTT button is released, a beep sounds for 400ms to indicate that the mode has been entered. If the scan IS on, it is resumed (the a m

47、ark goes on.) When any repeater becomes available, a ringing tone sonds and this mode ends. The mode is terminated when the system, group, scan, Pn, or AUX key is changed. 3-14. System Search Ths feature can be programmed to automatcally access other programmed systems when the selected system canno

48、t be accessed If an Intercept tone 1 sounds when the PTT button IS pressed after setting the moae, the transcelver has entered the mode c If the group ID IS a telephone Interconnect ID, the transcelver then attempts to access, In succession, other systems that have a telephone tnterconnect ID in g the revert group locatlon If the group ID IS a d