Kenwood-TK-2180-Service-Manual电路原理图.pdf

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1、 2004-6 PRINTED IN JAPANB51-8689-00 (N)961VHF FM TRANSCEIVERTK-2180SERVICE MANUALGENERAL .2SYSTEM SET-UP .2REALIGNMENT .3DISASSEMBLY FOR REPAIR .5CIRCUIT DESCRIPTION .7SEMICONDUCTOR DATA .13COMPONENTS DESCRIPTION .14PARTS LIST .16EXPLODED VIEW.25PACKING .26ADJUSTMENT .27TERMINAL FUNCTION .39PC BOARD

2、DISPLAY UNIT (X54-3470-XX) .42TX-RX UNIT (X57-6930-10) .46SCHEMATIC DIAGRAMDISPLAY UNIT (X54-3470-XX) .50TX-RX UNIT (X57-6930-10) .52BLOCK DIAGRAM .60LEVEL DIAGRAM .62OPTIONAL ACCESSORIESKNB-31A/32N/33L .63KSC-32 .63SPECIFICATIONS . BACK COVERCONTENTSCabinet assy(A02-3848-03)Cabinet assy(A02-3847-03

3、)Knob (PTT)(K29-9302-23)Packing(G53-1599-01)Packing(G53-1598-01)Button knob (Side)(K29-9303-03)Front glass(B10-2752-22)Helical antenna(KRA-22 : Option)Knob (Volume)(K29-9304-03)Knob (CH selector)(K29-9305-03)TK-2180 K TK-2180 K2Does not come with antenna.Antenna is available as an option.TK-21802INT

4、RODUCTIONSCOPE OF THIS MANUALThis manual is intended for use by experienced techni-cians familiar with similar types of commercial grade commu-nications equipment. It contains all required service informa-tion for the equipment and is current as of the publicationdate. Changes which may occur after

5、publication are coveredby either Service Bulletins or Manual Revisions. These areissued 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, or chassis. If

6、 thepart number is not known, include the chassis or kit numberof which it is a part, and a sufficient description of the re-quired component for proper identification.PERSONNEL SAFETYThe following precautions are recommended for person-nel safety: DO NOT transmit until all RF connectors are verifie

7、d se-cure and any open connectors are properly terminated.SHUT OFF and DO NOT operate this equipment near elec-trical blasting caps or in an explosive atmosphere. This equipment should be serviced by a qualified techni-cian only.SERVICEThis transceiver is designed for easy servicing. Refer tothe sch

8、ematic diagrams, printed circuit board views, andalignment procedures contained within.GENERAL / SYSTEM SET-UPSYSTEM SET-UPMerchandise receivedLicense and frequency allocated by FCCChoose the type of transceiverTransceiver programmingAre you using the optional antenna?Are you using the speaker micro

9、phone?A personal computer (IBM PC or compatible), programminginterface (KPG-36), and programming software (KPG-89D)are required for programming.(The frequency, and signalling data are programmed for thetransceiver.)Frequency range (MHz) RF power Type 12-keyTX/RX 136174 5W TK-2180 K NoTX/RX 136174 5W

10、 TK-2180 K2 YesYESKRA-22 or KRA-26Helical antennaNONO(Option)(Option)(Option)YESKMC-25Are you using the voice guide If you press a key while “CLONE LOCK” is displayed, thenumber that was pressed is displayed on the transceiver.Each press of the key shifts the display in order to the left.When you en

11、ter the password and press the or S key,“CLONE MODE” is displayed if the entered password iscorrect. If the password is incorrect, “CLONE LOCK” isredisplayed.How to enter the password with the encoder;If the encoder is rotated while “CLONE LOCK” is dis-played, numbers (0 to 9) are displayed flashing

12、. When youpress the C key, the currently selected number is deter-mined. If you press the S key after entering the pass-word in this procedure, “CLONE MODE” is displayed ifthe entered password is correct. If the password is incor-rect, “CLONE LOCK” is redisplayed.4. Power on the slave transceiver.5.

13、 Connect the cloning cable (part No. E30-3325-05) to theuniversal connectors on the master and slave.6. Press the S key on the master while the master displays“CLONE MODE”. The data of the master is sent to theslave. While the slave is receiving the data, “PROGRAM”is displayed. When cloning of data

14、is completed, the mas-ter displays “END”, and the slave automatically operatesin the User mode. The slave can then be operated by thesame program as the master.7. The other slave can be continuously cloned. When the Skey on the master is pressed while the master displays“END”, the master displays “C

15、LONE MODE”. Carry outthe operation in step 4 to 6.Notes:Can not be cloned if the password (over write password)is programmed to the slave.Only the same models can be cloned together.REALIGNMENT / DISASSEMBLY FOR REPAIRC + Power ONMINUTEHOURDAYMONTHYEARSSSSSChannel selectorChannel selectorChannel sel

16、ectorChannel selectorChannel selectorCompletionCloning cable(E30-3325-05)MICMICFig. 29. Clock Adjustment Mode9-1. Flow chart of operationRubber spacerRear panelTighten the circle nut, after applying “THREE BOND 1401” to the circle nut.DISASSEMBLY FOR REPAIR1. How to Attach the Rubber Spacer1) Press

17、the rubber spacer with fingers and insert it betweenthe rubber spacer and the rear panel without crevice.8. Firmware Information ModeTurn the transceiver ON with the Side1 switch helddown. Then, the version is displayed during holding theSide1 switch.TK-218064. How to Attach the VGS-11) Remove the 2

18、 screws.2) The tip of tweezers is put into the screw hole of the coverand is pried, the cover will remove.3) Use the 2 rubber cushions and attach them to the VGS-1.4) Plug the VGS-1 into the VGS-1 connector of the PC board,pressing down on the top of the VGS-1 until secure.5) The spacer turns the ad

19、hesive surface down. Next, pushbetween the chassis and VGS-1.6) Replace the cover and tighten the 2 screws.Rubber cushion(G13-1995-04)20 x 30 x 1.0 mmRubber cushion(G13-1974-04)21 x 21 x 2.5 mmVGS-1Spacer(J30-1292-04)4.5 x 24 x 3.0 mmVGS-1VGS-1 connectorDISASSEMBLY FOR REPAIR2. How to Stick the Shee

20、t (G11-4326-04)1) Remove the white separation paper of the sheet first (q)and stick the sheet on the front-glass (w).Next, remove the transparent separation paper of thesheet (e).3. How to Attach the TX-RX Unit1) In order to attach the TX-RX unit in chassis, dont put in theTX-RX unit aslant.Please l

21、evel the chassis and the TX-RX unit and attachthem.Sheet (G11-4326-04)Front-glassqweTK-218071. OverviewThis transceiver is VHF/FM portable transceiver designedto operate in the frequency range of 136 to 174MHz.2. Circuit Configuration by FrequencyThe receiver is a double-conversion superheterodyne w

22、itha first intermediate frequency (IF) of 59.85MHz and a secondIF of 455kHz. Incoming signals from the antenna are mixedwith the local signal from the PLL to produce the first IF of59.85MHz.This is then mixed with the 59.395MHz second local oscil-lator output to produce the 455kHz second IF. This is

23、 de-tected to give the demodulated signal.The transmit signal frequency is generated by the PLLVCO, and modulated by the signal from the microphone. It isthen amplified and sent to the antenna.3. Receiver System3-1. RF unitAn incoming RF signal from the antenna terminal ispassed through the antenna

24、switch (D106, D107, D211 andD213 are off) and then the bandpass filter (L215, L216). Thebandpass filter is adjusted by a variable capacitor. The inputvoltage to the variable capacitor is regulated by the voltageoutput from the D/A converter (IC605). The signal is ampli-fied by RF amplifier (Q207), a

25、nd passed through the band-pass filter (L211, L214).The resulting signal is applied to the first mixer (Q206),where it is mixed with the first local oscillator signal outputfrom the frequency synthesizer to produce the first IF(59.85MHz).3-2. IF unitThe first IF signal is passed through a four-pole

26、monolithiccrystal filter (XF200) to remove a adjacent channel signal. Thefiltered first IF signal is amplified by the first IF amplifier(Q205) and then applied to the lF system IC (IC200). The IFsystem IC provides a second mixer, second local oscillator,limiting amplifier, quadrature detector and RS

27、SI (ReceivedSignal Strength Indicator). The second mixer mixes the firstIF signal with the 59.395MHz of second local oscillator output(crystal unit X200) and produces the second IF signal of455kHz.The second IF signal is passed through the ceramic filter(CF201 : Wide, CF200 : Narrow) to more remove

28、the adjacentchannel signal. The filtered second IF signal is amplified bythe limiting amplifier and demodulated by the quadrature de-tector with ceramic discriminator (CD200). The demodulatedsignal is routed to the audio circuit.ANTTX/RX : 136174MHzANTSWRFAMPPAAMPTXAMP1st MIXMCF59.85MHzCF455kHzFM IF

29、SYSTEMAFAMPSP59.395MHz195.85233.85MHzPLLVCOMICAMPMIC136174MHz Fig. 1 Frequency configurationIC200 MIX, DET, IFSW SWQ203 IC606DMUTEIC600 (1/2)AF AMP2nd localOSCX200VOLIC605VC1VC2Q618SSWSWANTSWL111,112L113L215L216BPFD106,107D211,213Q207RFAMPQ2061st MIXQ205IF AMPANTL211L214BPFXF200MCF1st LocalOSC (PLL)

30、CF200CF201AQUA-LIC607HSDOSWQ605(1/2)AM2IC609AF PAINT. SPEXT. SPFig. 2 Receiver sectionCIRCUIT DESCRIPTIONTK-218083-3. Wide/Narrow switching circuitWide and Narrow settings can be made for each channelby switching the ceramic filters CF201 (Wide), CF200 (Nar-row). The Wide (low level) and Narrow (hig

31、h level) is outputfrom IC502.When a Wide (low level) is selected, Q200 (N-ch) turn offand Q200 (P-ch) turn on. When a Narrow (high level) is se-lected, Q200 (N-ch) turn on and Q200 (P-ch) turn off. D201and D203 are switched to ceramic filters when a high/lowlevel is selected.Q204 turns on/off with t

32、he Wide/Narrow and the IC200detector output level is changed to maintain a constant out-put level during wide or narrow signals.When SP-MIC is attached, SSW is connected to GND atinside of SP-MIC. For this reason, Q618 is turned off, and theAF signal is input only to amplifier for EXT SP of IC609.Ch

33、ange of INT/EXT SP refer to Fig. 4.AM1 AM2 SSW VC1 VC2 SPHLHHL INTHLLLHEXTLHHLLMUTELHLLLMUTEMXOAFOUTQUADIFOUTIFIW/N5RD314C201 C200C215C217R208 R211R215R212R209C209R205Q200D201 D203CF200CF201IC200R222R224Q204R2255CAFOUTW/NCD200“H”: Narrow“L” : WideFig. 3 Wide/Narrow switching circuitSWSWQ618VC12VC28B

34、AFAM1SSWAM2Q616(1/2)Q617Q605Q613Q6125VPIC609IC605IC607INT.SPEXT.SPAF3-4. Audio amplifier circuitThe demodulated signal from IC200 goes through themute switch (Q203), IC600 (1/2) and IC606, high-pass fil-tered, low-pass filtered, high-pass filtered and de-empha-sized by IC607.The signal then goes thr

35、ough mute switch (Q605 1/2), andan electronic volume control (IC605), and an AF switch (Q618is on), and is routed to audio power amplifier (IC609), where itis amplified and output to the internal speaker.The audio mute signal (AM1) from the IC502 becomesLow in the standby and Q612, Q613 which are po

36、wer supplycircuit for IC609 turn off. Also, the audio mute signal (AM2)becomes High to turn Q605 (1/2) off. When the audio isoutput, AM1 becomes High to turn Q612, Q613 on, and volt-age is supplied to power terminal VP of IC609. Also, AM2becomes Low to turn Q605 (1/2) on.The speaker is switched by t

37、he logic of speaker switchingterminal SSW on the universal connector. When SP-MIC isnot attached, the logic of SSW becomes High and SW (Q618)is turned on, and the AF signal is input to both amplifiers ofIC609.3-5. Squelch circuitThe output from IC200 enters FM IC again, then passedthrough a bandpass

38、 filter. The noise component output fromIC200 is amplified by Q201 and rectified by D202 to producea DC voltage corresponding to the noise level. The DC volt-age is sent to the analog port of the CPU (IC502). And IC200outputs a DC voltage (RSSI) corresponding to the input of theIF amplifier. The CPU

39、 reads the RSSI signal via pin 125.IC502 determines whether to output sounds from thespeaker by comparing the input voltage of pin 124 and pin125 with the preset value.DETBPFAMPDETNOISEAMPIF AMPRSSI127Q201 D202IC200 : FM IF ICIC502CPU125124SQ closePresetvalue PresetvalueANT input level ANT input lev

40、elSQ voltageRSSI voltageSQ openFig. 4 Audio amplifier circuitFig. 5 Squelch circuitFig. 6 Squelch and RSSI voltage vs ANT input levelCIRCUIT DESCRIPTIONTK-218094. Transmitter System4-1. Microphone amplifierThe signal from the internal microphone goes through themute switch (Q614).When the SP-MIC is

41、not attached, the microphone switch-ing terminal (MSW) on the universal connector becomesHigh, and mute switch (Q614) is turned on. When the SP-MIC is attached, MSW is connected to GND at inside of SP-MIC. For this reason, Q614 is turned off, the internal micro-phone is muted, and only the input of

42、the external micro-phone is supplied to the microphone amplifier.The signal from microphone goes through D/A converter(IC605), mute switch (Q610), and amplified by IC608 (1/2) andlimited by AGC circuit composed of D601, D602, Q606 andQ607. IC607 is composed of high-pass filter, low-pass filterand pr

43、e-emphasis/IDC circuit.The signal passes through the D/A converter (IC605) forthe maximum deviation adjustment, and enters the summingamplifier consisting of IC600 (2/2), and is mixed with the lowspeed data from the CPU (IC502).The output signal from the summing amplifier goes to theVCO modulation i

44、nput. The other output signal from thesumming amplifier passes through the D/A converter (IC605)again for the BAL adjustment, and the buffer amplifier(IC602), and goes to the TCXO modulation input.4-2. VOXThe IC608 (2/2) amplify the audio signal captured in themicrophone, and then the signal is conv

45、erted into the DCvoltage D603 rectifies.The DC voltage activates the CPU (IC502), and the VOXstarts.4-3. Drive and Final amplifierThe signal from the T/R switch (D100 is on) is amplified bydrive amplifier (Q101 and Q102) to +1517dBm.The output of the drive amplifier is amplified by the RFpower ampli

46、fier (Q105) to 5.0W (1W when the power is low).The RF power amplifier is MOS FET. The output of the RFpower amplifier is then passed through the harmonic filter(LPF) and antenna switch (D106, D107 are on) and applied tothe antenna terminal.4-4. APC circuitThe APC circuit always monitors the current

47、flowingthrough the RF power amplifier (Q105) and keeps a constantcurrent. The voltage drop at R125, R127 and R130 is causedby the current flowing through the RF power amplifier andthis voltage is applied to the differential amplifier (IC100 1/2).IC100 (2/2) compares the output voltage of IC100 (1/2)with the reference voltage from IC502, and the output ofIC100 (2/2) controls the VGG of Q101, Q102 and Q105 tomake the both voltages to same voltage.The change of power high/low is carr