Kenwood-TK-3107-Service-Manual电路原理图.pdf

© 2000-2 PRINTED IN JAPANB51-8572-00(S) 141TK-3107GENERAL. 2REALIGNMENT . 2DISASSEMBLY FOR REPAIR . 4CIRCUIT DESCRIPTION . 5SEMICONDUCTOR DATA . 8DESCRIPTION OF COMPONENTS . 9PARTS LIST. 10EXPLODED VIEW . 17PACKING . 18ADJUSTMENT. 19PC BOARD VIEWSTX-RX UNIT (X57-6030-11) . 23SCHEMATIC DIAGRAM . 29BLOCK DIAGRAM . 33LEVEL DIAGRAM . 35KNB-15A (Ni-Cd BATTERY) . 36SPECIFICATIONS . BACK COVERAntenna(T90-0694-15)Cabinet assy(A02-2448-13)Knob(VOLUME)(K29-5255-03)TK-3107 (16 channels)CONTENTSKnob(CHANNEL SELECTOR)(K29-5278-03)UHF FM TRANSCEIVERSERVICE MANUALM2 version2TK-3107MODE FUNCTIONUser Mode Use this mode for normal operation.PC Mode Use this mode, to make varioussettings by means of the FPU throughthe RS-232C port.Manufacture Mode Use this mode, to realign the varioussettings through the RS-232C portduring manufacture work.2 How to enter each modeMODE PROCEDUREUser Mode Power ONPC Mode Connect to the IBM PC compatiblemachine and controled by the FPU.1 ModesINTRODUCTIONSCOPE OF THIS MANUALThis manual is intended for use by experienced techniciansfamiliar with similar types of commercial gradecommunications equipment. It contains all required serviceinformation for the equipment and is current as of thepublication data. Changes which may occur after publicationare covered by either Service Bulletins or Manual Revisions.These are issued as required.ORDERING REPLACEMENT PARTSWhen ordering replacement parts or equipmentinformation, the full part identification number should beincluded. This applies to all parts : components, kits, orchassis. If the part number is not known, include the chassis orkit number of which it is a part, and a sufficient description ofthe required component for proper identification.PERSONAL SAFETYThe following precautions are recommended for personalsafety : DO NOT transmit until all RF connectors are verified secureand any open connectors are properly terminated. SHUT OFF and DO NOT operate this equipment nearelectrical blasting caps or in an explosive atmosphere. This equipment should be serviced by a qualifiedtechnician only.SERVICEThis radio is designed for easy servicing. Refer to theschematic diagrams, printed circuit board views, andalignment procedures contained within.GENERAL/REALIGNMENT3 Getting acquaintedPC ModeUser Mode Manufacture ModeDestnation Number of CH RF power outputM2 16 4WSpeakerAntennaSpeaker/microphonejacksMicrophone PTT (Push-To-Talk) switchPress this switch, then speak into the microphone tocall a station. Release the switch to receive. Monitor keyPress and hold to monitor how busy the currentchannel is and to monitor signals being received thatdo not contain the matched QT/DQT code.fi Channel selectorRotate to select channels 1 16. LED indicatorLights red while transmitting, green while receiving asignal. Flashes red when the battery voltage is lowwhile transmitting.Power switch/ Volume controlTurn clockwise to switch the transceiver ON. Turncounterclockwise until a click sounds, to switch thetransceiver OFF. Rotate to adjust the volume level.PC MODEPrefaceThe transceiver is programmed by using a personalcomputer, programming interface (KPG-22) and programmingsoftware (KPG-55D).The programming software can be used with an IBM PC orcompatible. Figure 1 shows the setup of an IBM PC forprogramming.Connenction procedure1. Connect the TK-3107 to the personal computer with theinterface cable.2. When data is transmitting from the transceiver the red LEDlights.When data is received by the transceiver the green LEDlights.Notes: The data stored in the personal computer must match theModel Name when it is written into the EEPROM. Do not press the PTT key during data transmission orreception.REALIGNMENT3TK-3107REALIGNMENTGray SPMICGray/Black 1.5D-XV Lead wireGray-XV Shield wire Tuning cable(E30-3216-05)KPG-22ANTRF Power meteror SSGKPG-55DIBM-PC-+-+Fig. 1 KPG-22 description(PC programming interface cable: Option)The KPG-22 is required to interface the TK-3107 with thecomputer. It has a circuit in its D-subconnector (25-pin) casethat converts the RS-232C Iogic level to the TTL Ievel. TheKPG-22 connects the side panel jacks of the TK-3107 to thecomputer's RS-232C serial port. Programming software descriptionThe KPG-55D Programming Disk is supplied in 3-1/2“ the diskformat. The Software on this disk allows a user to program theTK-3107 radios via a Programming interface cable (KPG-22). Programming with IBM PCIf data is transferred to the transceiver from an IBM PC withthe KPG-55D, the destination data (basic radio information)for each set can be modified. Normally, it is not necessary tomodify the destination data because their values aredetermined automatically when the frequency range(frequency type) is set.The values should be modified only if necessary.Data can be programmed into the EEPROM in RS-232Cformat via the SP MIC plug.In this mode the PTT Iine operates as TXD and RXD data linesrespectively.4TK-3107Separating the chassis from the unit1. Remove the eleven screws » .2. Remove the solder from the antenna terminal using asoldering iron then lift the unit off .3. Remove the two screws and remove the antennaconnector.Note : When reassembling the unit in the chassis, be sure tosolder the antenna terminal.DISASSEMBLY FOR REPAIRSeparating the case assembly from the chassis1. Remove the two knobs ¶ and three round nuts .2. Remove the two screws .3. Expand the right and left sides of the bottom of the caseassembly, Iift the chassis, and remove it from the caseassembly .4. Taking care not to cut the speaker lead , open the chassisand case assembly.Lever knobCace assemblyAntenna terminalRemoving the lever1. Raise the lever on the lower case , insert a small flatscrewdriver into the space between the case and lever,open the case carefully and lift the lever off.Note : Do not force to separate the case from the lever.5TK-31071. Frequency configurationThe receiver utilizes double conversion. The first IF is38.85MHz and the second IF is 450kHz. The first localoscillator signal is supplied from the PLL circuit.The PLL circuit in the transmitter generates the necessaryfrequencies. Fig. 1 shows the frequencies.CIRCUIT DESCRIPTIONANTANT SWRFAMPMCFCFIF SYSTEMAFAMPRXTXPAAMPTXAMPPLLVCOMICAMPTCXOX3multiply38.85MHz450kHz38.4MHz12.8MHzSPMICFig. 1 Frequency configuration2. ReceiverThe receiver is double conversion superheterodyne,designed to operate in the frequency range of 470 to 490MHz.The frequency configuration is shown in Fig. 1.1) Front - end RF amplifierAn incoming signal from the antenna is applied to an RFamplifier (Q203) after passing through a transmit/receiveswitch circuit (D102 and D103 are off) and a 3-pole LC filter.After the signal is amplified (Q203), the signal is filtered by aband pass filter (a 3-pole LC filter) to eliminate unwantedsignals before it is passed to the first mixer.The voltage of these diodes are controlled by to track the MPU(IC403) center frequency of the band pass filter. (See Fig. 2)Fig. 2 Receiver section configurationItem RatingNominal center frequency 38.850MHzPass band width ±5.0kHz or more at 3dB40dB stop band width ±20.0kHz or lessRipple 1.0dB or lessInsertion loss 4.0dB or lessGuaranteed attenuation 80dB or more at fo -910kHzTerminal impedance 610 / 3PFItem RatingNominal center frequency 450kHz6dB band width ±6.0kHz or more50dB band width ±12.5kHz or lessRipple 2.0dB or less at fo ±4kHzInsertion loss 6.0dB or lessGuaranteed attenuation 35.0dB or more at fo ±100kHzTerminal impedance 2.0 kXF201:L71-0522-05CF200:L72-0958-052) First MixerThe signal from the RF amplifier is heterodyned with thefirst local oscillator signal from the PLL frequency synthesizercircuit at the first mixer (Q202) to create a 38.85MHz firstintermediate frequency (1st IF) signal. The first IF signal isthen fed through two monolithic crystal filters (MCFs : XF201)to further remove spurious signals.3) IF amplifierThe first IF signal is amplified by Q201, and then entersIC200 (FM processing IC). The signal is heterodyned againwith a second local oscillator signal within IC200 to create a450kHz second IF signal. The second IF signal is then fedthrough a 450kHz ceramic filter (CF200) to further eliminateunwanted signals before it is amplified and FM detected inIC200.4) AF amplifierThe recovered AF signal obtained from IC200 is amplifiedby IC300 (1/4), filtered by the IC300 low-pass filter (2/4) andIC300 high-pass filter (3/4) and (4/4), and de-emphasized byR303 and C306. The AF signal is then passed through aWIDE/NARROW switch (Q303). The processed AF signalpasses through an AF volume control and is amplified to asufficient level to drive a loud speaker by an AF poweramplifier (IC302).ANTD102,D103BPFL208L211APCTUNERF AMPQ203BPFL214,L203,L204MIXERQ202MCFXF201IF AMPQ201CF200IF, MIX, DETIC200AF AMPLPF, HPFIC300AF PA AMPIC302SPWIDE/NARROW SWQ303X3multiplyQ1IC403MPUTCXO1st Local OSC(PLL)ANT SW6TK-31072) VCOThe operating frequency is generated by Q4 in transmitmode and Q3 in receive mode. The oscillator frequency iscontrolled by applying the VCO control voltage, obtained fromthe phase comparator, to the varactor diodes (D2 and D4 intransmit mode and D1 and D3 in receive mode). The T/R pin isset high in receive mode causing Q5 and Q7 to turn Q4 off,and turn Q3 on . The T/R pin is set low in transmit mode. Theoutputs from Q3 and Q4 are amplified by Q6 and sent to thebuffer amplifiers.5) SquelchPart of the AF signal from the IC enters the FM IC again,and the noise component is amplified and rectified by a filterand an amplifier to produce a DC voltage corresponding to thenoise level.The DC signal from the FM IC goes to the analog port of themicroprocessor (IC403). IC403 determines whether to outputsounds from the speaker by checking whether the inputvoltage is higher or lower than the preset value.To output sounds from the speaker, IC403 sends a high signalto the MUTE and AFCO Iines and turns IC302 on throughQ302, Q304, Q305, Q306 and Q307.(See Fig. 3)3. PLL frequency synthesizerThe PLL circuit generates the first local oscillator signal forreception and the RF signal for transmission.1) PLLThe frequency step of the PLL circuit is 5 or 6.25kHz.A 12.8MHz reference oscillator signal is divided at IC1 by a fixedcounter to produce the 5 or 6.25kHz reference frequency. Thevoltage controlled oscillator (VCO) output signal is bufferamplified by Q6, then divided in IC1 by a dual-moduleprogrammable counter . The divided signal is compared in phasewith the 5 or 6.25kHz reference signal in the phase comparator inIC1. The output signal from the phase comparator is filtreredthrough a low-pass filter and passed to the VCO to control theoscillator frequency. (See Fig.4)FM IF IC IC200IF AMP DETDETHPFAMPLPFIC301QT/DQTQ303W/N SWIC403MPUBUSYMUTE AFCOTI6 567 62AF AMPIC300LPF HPFQ302SWIC302AF PA AMPQ307SWSWSPQ304, 305, 306CIRCUIT DESCRIPTION6) Receive signalingQT/DQT300 Hz and higher audio frequencies of the output signalfrom IF IC are cut by a low-pass filter (IC301). The resultingsignal enters the microprocessor (IC403). IC403 determineswhether the QT or DQT matches the preset value, andcontrols the MUTE and AFCO and the speaker output soundsaccording to the squelch results.Fig. 4 PLL circuitPLL DATA12.8MHzREF OSCI/MI/NPLL IC IC1PHASECOMPARATORCHARGEPUMPLPF5kHz/6.25kHzD2, 4D1, 3Q4TX VCOQ3RX VCOQ6BUFF AMPQ2RF AMPQ5, 7T/R SW5kHz/6.25kHzFig. 3 AF Amplifier and squelch7TK-31074. Transmitter1) Transmit audioThe modulation signal from the microphone is amplified byIC500 (1/2), passes through a preemphasis circuit, andamplified by the other IC500 (1/2) to perform IDC operation.The signal then passes through a low-pass filter (splatter fiIter)(Q501 and Q502) and cuts 3kHz and higher frequencies. Theresulting signal goes to the VCO through the VCO modulationterminal for direct FM modulation. (See Fig. 6)2) QT/DQT encoderA necessary signal for QT/DQT encoding is generated byIC403 and FM-modulated to the PLL reference signal. Sincethe reference OSC does not modulate the loop characteristicfrequency or higher, modulation is performed at the VCO sideby adjusting the balance. (See Fig. 6)CIRCUIT DESCRIPTIONFig. 6 Transmit audio QT/DQTMUTEVR501MAXDEVBALANCEX1, IC1D5, Q4VCOREFERENCEOSC(TCXO)MICIC500 (1/2)MICAMPIC500 (1/2)IDCQ503SWPREEMPHASISQ501, 502LPF(SPLATTER FILTER)IC403TOQT/DQTVR5003) VCO and RF amplifierThe transmit signal obtained from the VCO buffer amplifierQ100, is amplified by Q101 and Q102. This amplified signal ispassed to the power amplifier, Q105 and Q107, whichconsists of a 2-stage FET amplifier and is capable ofproducing up to 4W of RF power. (See Fig.7)4) ANT switch and LPFThe RF amplifier output signal is passed through a low-pass filter network and a transmit/receive switching circuitbefore it is passed to the antenna terminal. The transmit/receive switching circuit is comprised of D101, D102 andD103. D102 and D103 are turned on (conductive) in transmitmode and off (isolated) in receive mode.Fig. 7 APC systemAMPQ101,Q102DRIVE AMPQ1055TBQ103, Q104B SWDETIC100APC5TQ109SWQ106SWAPC5TQ108SWRXD102,103ANT SWFINAL AMPQ107ANT SWD101LPFANT5TSWQ110TH1025) APCThe automatic power control (APC) circuit stabilizes thetransmitter output power at a predetermined level by sensingthe drain current of the final amplifier Field Effect Transistor(FET) . The voltage comparator, IC100 (2/2), compares thevoltage obtained from the above drain current with a referencevoltage which is set using the microprocessor. An APCvoltage proportional to the difference between the sensedvoltage and the reference voltage appears at the output ofIC100 (1/2). This output voltage controls the gate of the FETpower amplifier, which keeps the transmitter output powerconstant. The transmitter output power can be varied by themicroprocessor which in turn changes the reference voltageand hence, the output power.6) Terminal protection circuitWhen the thermistor (TH102) reaches about 80C, theprotection circuit turns on Q110 to protect transmitting finalamplifier (Q107) from the over heating.5. Power supplyA 5V reference power supply 5M for the control circuit isderived from an internal battery. This reference is used toprovide a 5V supply in transmit mode 5T, a 5V supply inreceive mode 5R, an