Kenwood-TK-3131-Service-Manual电路原理图.pdf

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1、 2001-11UHF FM TRANSCEIVERTK-3130/3131SERVICE MANUAL30K : TK-3130 (K type)31K : TK-3131 (K type)A : TK-3131 (A type)GENERAL . 2REALIGNMENT . 3CIRCUIT DESCRIPTION . 5SEMICONDUCTOR DATA . 9DESCRIPTION OF COMPONENTS . 10PARTS LIST . 11EXPLODED VIEW. 17PACKING . 18ADJUSTMENT . 20PC BOARD VIEWSTX-RX UNIT

2、 (X57-6460-XX) (B/2) . 24TX-RX UNIT (X57-6460-XX) (A/2). 27SCHEMATIC DIAGRAM. 33BLOCK DIAGRAM . 37LEVEL DIAGRAM . 39TERMINAL FUNCTION . 40KNB-27N (Ni-MH BATTERY PACK) . 40SPECIFICATIONS . 41CONTENTSAntenna(T90-1004-05)Knob (VOL)(K29-9138-03)Cap (P-jack)(B09-0627-03)Cabinet assy (Front)(A02-3663-03)

3、: 30K(A02-3705-03) : 31K(A02-3706-03) : AButton knob (PTT)(K29-9137-13)Key top(K29-9136-12)Photo is TK-3130.2TK-3130/3131GENERALINTRODUCTIONSCOPE OF THIS MANUALThis manual is intended for use by experienced techni-cians familiar with similar types of commercial grade com-munications equipment. It co

4、ntains all required service in-formation for the equipment and is current as of this publica-tion date. Changes which may occur after publication arecovered by either Service Bulletins or Manual Revisions,which are issued as required.ORDERING REPLACEMENT PARTSWhen ordering replacement parts or equip

5、ment informa-tion, the full part identification number should be included.This applies to all parts : components, kits, and chassis. Ifthe part number is not known, include the chassis or kitnumber of which it is a part and a sufficient description ofthe required component, for proper identification

6、.PERSONNEL SAFETYThe following precautions are recommended for person-nel safety : 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. This equipment should b

7、e serviced by only qualified tech-nicians.SERVICEThis radio is designed for easy servicing. Refer to theschematic diagrams, printed circuit board views, and align-ment procedures contained within.TK-3130Destination Number of CH Frequency No. / Frequency / Color Factory default CH setting RF power ou

8、tputK 2 channel 1 464.5000MHz Brown CH1 : 464.5500MHz / QT OFF 1W / 500mW2 464.5500MHz Yellow Color : Yellow3 467.7625MHz J CH2 : 467.9250MHz / QT OFF4 467.8125MHz K Color : Blue Star5 467.8500MHz Silver Star6 467.8750MHz Gold Star7 467.9000MHz Red Star8 467.9250MHz Blue StarAll channels are Narrow

9、band width. User can select channel frequency from above.TK-3131Destination Number of CH Frequency No. / Frequency / Color RF power outputBank A Bank BRX/TX RX TXK 15 channel CH1 : 462.5625MHz CH1 : 462.5625MHz 462.5625MHz 1W / 500mWCH2 : 462.5875MHz CH2 : 462.5875MHz 462.5875MHzCH3 : 462.6125MHz CH

10、3 : 462.6125MHz 462.6125MHzCH4 : 462.6375MHz CH4 : 462.6375MHz 462.6375MHzCH5 : 462.6625MHz CH5 : 462.6625MHz 462.6625MHzCH6 : 462.6875MHz CH6 : 462.6875MHz 462.6875MHzCH7 : 462.7125MHz CH7 : 462.7125MHz 462.7125MHzCH8 : 462.5750MHz White CH8 : 462.5750MHz 467.5750MHz WhiteCH9 : 462.6250MHz Black CH

11、9 : 462.6250MHz 467.6250MHz BlackCH10 : 462.6750MHz Orange CH10 : 462.6750MHz 467.6750MHz OrangeCH11 : 462.5500MHz CH11 : 462.5500MHz 467.5500MHzCH12 : 462.6000MHz CH12 : 462.6000MHz 467.6000MHzCH13 : 462.6500MHz CH13 : 462.6500MHz 467.6500MHzCH14 : 462.7000MHz CH14 : 462.7000MHz 467.7000MHzCH15 : 4

12、62.7250MHz CH15 : 462.7250MHz 467.7250MHzAll channels are Wide band width. Factory default setting is Bank A.3TK-3130/3131TK-3131Destination Number of CH Frequency No. / Frequency / Color RF power outputA 14 channel CH1 : 467.5125MHz 1W / 500mWCH2 : 467.5250MHzCH3 : 467.5375MHzCH4 : 467.5500MHzCH5 :

13、 467.5625MHzCH6 : 467.5750MHzCH7 : 467.5875MHzCH8 : 467.6000MHzCH9 : 467.6125MHzCH10 : 467.6250MHzCH11 : 467.6375MHzCH12 : 467.6500MHzCH13 : 467.6625MHzCH14 : 467.6750MHzAll channels are Narrow band width.GENERALGETTING ACQUAINTEDq PTT (Push to Talk) switchPress and hold, then speak into the microph

14、one to trans-mit.w MENU keyPress to perform various functions. Press and hold whileswitching the power ON to enter Setting Mode.e CAL keyPress before making a call, to alert the other party mem-bers.r / keysPress to change the operating channel, to select a menuin Setting Mode, and to perform other

15、functions.t Power switch/Volume controlTurn clockwise to switch the power ON and counter-clockwise to switch the power OFF. Rotate to adjust thevolume.y MON keyPress to monitor the current channel for activity.u LED indicatorIndicates the transceiver status.i SP/MIC jacksLift the covers and insert t

16、he accessorys plugs here.1234568AntennaMicrophoneSpeaker74TK-3130/3131Frequency ConfigurationFig. 1 Frequency configurationANTSWBPFMIX, IFDETAFAMPTCXORFAMPRFAMPMICAMPPLL VCO1st MIXCF450kHz38.85MHzMCF38.4MHzSPMICANT460470MHz460470MHz421.15431.15MHzRFAMPTriplerX312.8MHzReception method Double super he

17、terodyne1st IF frequency 38.85MHz2nd IF frequency 450kHzTransmission method VCO direct oscillation amplificationModulation Variable reactance phase modulationTable 1 Basic configurationReceiver Systema73 Front EndThe high-frequency signal from the antenna passesthrough a low-pass filter and a high-f

18、requency switch (D12,L25 and D13) which switches between transmission and re-ception, and goes to the BPF (L42) to remove unwanted sig-nals. The resulting signal is amplified by high-frequency am-plifier (Q18) and goes to the first mixer (Q19).a73 First MixerThe signal that reaches Q19 is mixed with

19、 the first localsignal from the VCO to produce a first IF signal (38.85MHz).(Receive frequency First local frequency= First IF frequency = 38.85MHz)The first IF signal passes through MCF: XF1 (monolithiccrystal filter) to remove unwanted signals.The first IF signal is amplified by IF amplifier (Q20)

20、 andgoes to IF IC (IC2).CIRCUIT DESCRIPTIONItem RatingNominal center frequency (fo) 38.85MHzPass bandwidth 5.0kHz or more at 3dBAttenuation bandwidth 18.5kHz or less at 35dBRipple 1.0dB or lessInsertion loss 4.0dB or lessGuaranteed attenuation 70dB or more at fo900kHzTerminating impedance 61010% / 3

21、.0pF0.5pFTable 2 MCF (L71-0586-05) : TX-RX unit (B/2) XF1Item RatingNominal center frequency (fo) 450kHz6dB bandwidth 6.0kHz or more50dB bandwidth 12.5kHz or lessRipple (at 450kHz4kHz) 2dB or lessGuaranteed attenuation 35dB or more(at 450kHz100kHz)Insertion loss 6dB or lessI/O matching impedance 2.0

22、kTable 3 Ceramic filter (L72-0958-05) : TX-RX unit (B/2) CF1Fig. 2 Receiver section configurationFig. 3 Receiver circuitANTLPF3T 3RD12L25D13L42BPFQ183RIF ICQ20XF13R1st IF : 38.85MHzQ19VCO1st localOSCBPFL42RF AMPQ181st MIXERQ19MCFXF1IF AMPQ20IF AMP, DETIC2AF AMPIC208 SP1st local OSC (PLL) 2nd local O

23、SCANT38.85MHz465.0MHzD12D13L25LPFANTSW5TK-3130/3131CIRCUIT DESCRIPTIONa73 IF AmplifierThe IF circuit is integrated in the FM IC (IC2). The IF ICcontains local input, mixer, limiter amplifier, FM DET, andlow-frequency amplifier.The IF signal coming from the IF amplifier (Q20) goes tothe IF IC mixer a

24、nd is mixed with the second local signal(38.4MHz) to produce a second IF signal.(38.85MHz 38.4MHz = 450kHz)The tripled PLL reference oscillation (12.8MHz x 3) isused for the second local signal.The second IF signal passes through ceramic filter (CF1)to remove unwanted signals.The second IF signal pa

25、ssing through the ceramic filterpasses through the limiter amplifier consisting six differen-tial amplifiers and is detected.The FM detection is quadrature detection method. Thephase of the output signal from the limiter amplifier isshifted by 90 degrees by a quad coil (L36) and comparedwith the ori

26、ginal waveform to produce detection output.a73 Squelch CircuitA squelch circuit is provided to prevent no-signal noise orweak signals from outputting to a speaker during transmis-sion.a73 AF CircuitThe FM IC output passes through the base band IC(IC205), mute (Q213), and amplifier (IC207). After go

27、to AFpower amplifier IC (IC208). This IC have BTL amplifier func-tion and electrical Volume. At internal speaker, BTL ampli-fied. At external speaker, IC switch off the 1 channel ampli-fier by connectors information.MIXAmpAmpAmpAmpDETIC2IC205IC208CF1450kHz16MIXIN38.85MHz1st IF9AFOUT38.4MHzX3TCXOQ221

28、2.8MHzPLLX1HPF LPF23RXINMUTEQ213IC207AmpSWVR202AF VRINT. SPJ200EXT. SPAFQ21Noise ampD16DETBUSY192452RSSIIC204CPU6AF MUTEQ212Q214SWSP AMPQ20IF ampFig. 4 IF amplifier, squelch andAF amplifier circuitsTransmitter Systema73 Microphone Amplifier CircuitThe audio signal from the microphone passes throught

29、he MIC amplifier (IC207). Then, the signal goes through thebase band IC (IC205) that has the 6dB/oct pre-emphasis cir-cuit, band-pass filter (300 to 3kHz), amplifier, and limiter.The distortion components outside the audio band are re-moved by the splatter filter.a73 Modulation CircuitThe MIC amplif

30、ier (IC207) output passes through VR201for modulation adjustment and goes to the modulation inputof the VCO circuit for variable reactance phase modulation.a73 Transmission Output CircuitThe VCO output is amplified by a high-frequency ampli-fier (Q7Q10), passes through a high-frequency antennaswitch

31、, passes through a low-pass filter and goes to the an-tenna.The transmission output is about 1W with 3.8V DC sup-ply at battery terminal.a73 Low-Pass Filter CircuitA three-stage Chebyshev type low-pass filter is locatedbetween the antenna and transmit/receive switching circuit.It removes harmonic co

32、mponents contained in the transmis-sion output.Fig. 5 Transmitter section configurationFig. 6 Microphone amplifier circuitANTLPFANT SWD12,13DRIVEAMPQ9PRE-DRIVEAMPQ8RF AMPQ7VCOQ4, Q5VR201MIC AMPIC207MICFINALAMPQ10AmpIC205LPFIDCDETD205SWD204MICMUTEQ210IC207MIC ampMIC6TK-3130/3131CIRCUIT DESCRIPTIONPLL

33、 Systema73 VCO CircuitThe VCO is housed in a shield case.The VCO circuit consists of a transistor (Q4), a variablecapacity diode (D4) for frequency control, a variable capacitydiode (D8) for modulation, transmit/receive frequency shiftdiode (D17), control transistor (Q2), variable capacitor (TC1)for

34、 PLL lock voltage control, and oscillator buffer amplifier(Q5).a73 PLL CircuitFrequency data is sent to the PLL IC (IC1) from the CPU(IC204) as serial data when the power turns on, when thechannel is changed, or when transmission begins. It setsthe variable divider in the PLL IC.The TCXO (X1) produc

35、e a 12.8MHz reference frequency.It is divided to produce a 12.5kHz PLL comparison fre-quency in the PLL IC.The VCO input is divided by the divide ratio set by thedivider in the PLL IC to generate 12.5kHz. It is comparedwith the reference comparison frequency by the phasecomparator to detect a phase

36、difference.The charge pump circuit in the PLL IC converts it to acontrol voltage that can drive the VCO directly.The control voltage passes through a loop filter whichpasses low frequency and is applied to the VCO control pinto control the oscillator frequency. The loop filter removesunwanted harmon

37、ics and noise contained in the output fromthe phase comparator and determines PLL response andsynchronizing characteristics by the amplitude and phasecharacteristics (Fig. 8).Fig. 7 VCO circuitIn receive mode, the shift signal T/R goes low, Q2 turnsoff, and the shift diode (D17) not contact. Q4 prod

38、uces thefirst local frequency for reception.(Receive channel frequency 38.85MHz)In transmit mode, the shift signal T/R goes high, Q2 turnson and D17 does conducts. Q4 produces about 460470MHz and the VCO frequency equals the transmit channelfrequency.The 3.0V circuit voltage is produced by ripple re

39、movingfilter circuit Q3.a73 Unlock Detection CircuitIf the PLL cannot be synchronized for some reason orother when switching the channel or changing betweentransmission and reception, the PLL IC outputs a low unlockdetection signal. This signal goes to the CPU to inhibit trans-mission when the PLL i

40、s unlocked.Fig. 8 PLL circuit+CP1 XIN3C3CPLL data(CPU)STBDATACKCPU (IC204)ULVCOLVLoop filterVCO OUTF OUTFIN13C,T/R,MODPLL ICIC1LDTCXOTOX1 12.8MHzVcontR22R23R126R21R24R26C42C186C27C38C36C198C194TC1D8D4D17C44C46C30C31C29C33C32D3R15R17R36L10L9L43Q4Q2Q3Q5C45C41R25C185R35R18R10L11R11 L8L44L12R14R146LVMOD

41、T/R3C+VCOOUT7TK-3130/3131Control Systema73 Reset CircuitWhen a battery voltage is dropped, IC201 is detected lowvoltage, and this detected signal input to IC204 for stop theCPU function. IC200 is detected the reset voltage.a73 Battery Voltage Detection CircuitThe unit detects a low battery voltage a

42、nd display theBATT indicator on the LCD. The battery voltage is dividedand applied to the analog value input pin (BATT) of the CPU,and converted to a digital signal.a73 Power Supply CircuitThe power supply voltage is maintained to 3.0V by theseries regulator (IC213). It is used as CPU power 3M. The3

43、C, 3R and 3T voltages are regulated by the IC209.The B (battery voltage) is supplied to the RF final transis-tor Q10.The transmission power 3T is supplied to the transmis-sion output circuit when the CPU turns Q219 on only intransmit mode. 3T is junction to VR2 to generate PA gate(Q10) for power ali

44、gnment.The reception power 3R is provided to the receive and IFcircuits when the CPU turns Q220 on only in receive mode.The transmission/reception power 3C is supplied to theVCO and PLL circuits when the CPU turns Q218 on in trans-mit and receive modes.If no signal is received for 10 seconds, the CP

45、U entersthe power save mode, and turns common power 3C andreception power 3R on for one cycle and off for three cyclesaccording to the signals from the CPU to save the batterypower.CIRCUIT DESCRIPTIONFig. 9 Reset, battery voltage detection andpower supply circuitsFig. 10 QT/DQT circuitIC213AVRIC209

46、Q218Q220Q219AVR SWSWSW3C3MSB3R3TPowerSWBIC204CPUBATTIC204CPUTOIC206 IC2TI4020LPFTCXOIF ICVCOTX AFVR200LPFRX AFFig. 11 AK2368 (IC205) block diagramHPF+VR1Com-pressorPre-emphasisScramblerLimiterSplatterfilter+VR2HPFBPFOSCLPF+VR3+Control registerand data bufferMSKMODEMExpander+VR4De-emphasisDe-scramble

47、r+23221415ReceptionsignalinputTransmissionsignal output63.6864MHz17181934112021MicrophoneinputFramedetectionReceiverReception outputTX data/RX dataControl dataa73 QT/DQT Encode (Transmit)QT/DQT signal is generated by CPU (IC204). Output sig-nal (IC204 pin 40 (TO) goes to TCXO modulation and VCOmodulation (Through the VR200). Decode (Receive)Detected AF signal go to IC206. Function of IC206 is LPFfor sub-audible frequency. This signal goes to IC204 pin 20(TI). IC204 is detected the QT or DQT.8TK-3130/3131SEMICONDUCTOR DATAa73 Terminal functionPin No. Port Name I/O Function1