Kenwood-RV-251-Service-Manual电路原理图.pdf

AV SURROUND RECEIVERR-V251SERVICE MANUAL©1999-8/B51-5562-00 (K/K) 179270%Caution : No connection of ground line if disassemble the unit.Please connect the ground line on rear panel, PCBs, Chassis and someothers.* Refer to parts list on page 25ON/STANDBYPHONESINPUTTAPE 2(MONITOR)TA/NEWS/INFO.DISP.AUTOA.MEMOBANDPTYCLOCKMODE TIMERSETTUNINGMODEMULTI CONTROLLEVELVOLUME CONTROLDOWNUPAV SURROUND RECEIVER R-V251R D SEONSYSTEMCONTROLFRONTSURROUNDCENTERSUB WOOFERSUB WOOFERPRE OUTREARFRONTCENTERSPEAKERS( 6-16 )UNSWITCHED TOTAL150W MAX.AC 230V 50HzANTENNAAMFM 75 GNDTAPE 2(MONITOR)TAPE1 / MDCDAUXINRECVCRPLAYRECPLAYRECPLAYR LLAUDIOVIDEOVCRREC OUTMONITOROUTDVDVCRPLAY INLRRLC131015171912112IN495757DVD 6CH./2CH.INPUTR161820224331333937353432363840Panel dressing(A21-3777-03)Window(B10-2367-02)Panel *(A60-)Knob(k29-6727-04)Button(R) *(K29-)Button(L)(K29-6816-02)Phono jack(4P)(E63-0186-08)Phono jack(6P)x2(E63-0187-08)Lock terminal board(E70-0120-08)Phono jack(E63-1137-08)Phono jack(6P)(E63-1136-08)AC outlet *(E03-)Lock terminal board(E70-0119-08)Power cord bushing(J42-0346-08)Metallic cabinet(A01-3750-08)Lock terminal board(E21-0034-08)Phono jack(4P)(E63-1152-08)Phone jack(E11-0188-05)AC power cord *(E30-)R-V2512CONTENTS / ACCESSORIES / CAUTIONSContentsCONTENTS / ACCESSORIES / CAUTIONS.2BLOCK DIAGRAM.3CIRCUIT DESCRIPTION.4ADJUSTMENT.8PC BOARD.9SCHEMATIC DIAGRAM.13EXPLODED VIEW.24PARTS LIST.25SPECIFICATIONS.31FM indoor antenna (1)(T90-0830-08)AM loop antenna (1) (T90-0804-08)Remote control unit (1)(A70-1306-05): RC-S0506.TE(A70-1305-05): RC-S0505.XBattery cover (A09-0378-08)Loop antenna stand (1)Batteries(R6/AA) REMOTE CONTROL UNITRC-S0506A B+1054321098766788%CR¢CR¢CR44CR1CR3377¡CR221ALL INFO.TEXT DISP.TITLESEARCHMEMOTUNERBANDe STILL STEP EA.MONI.AUTOMEMORYRDSDISPLAYPTYSEARCHDISPLAYSLEEPNEXTPREV.POWERTIMECLEARP.MODE CHECKSTEREOMUTESOURCEDIRECTDSPLEVEL VOLUMEPRO LOGIC 3 STEREOMULTICONTROLTESTTONEMODEINPUT TAPE 2(MONITOR)FREEZE PAL/NTSCRETURNTAPEMD/LOSELECTP.B.C. REC/ARMO.T.E.LD AUTO DIGITALCD/VIDEO CD/LDREPEATFRAME/TIMEPTY TA/NEWS/INFO.DISC SKIPEDIT MODEALL TEXTSEARCHP.CALLCR %How to reset the microcomputerThe microcomputer may malfunction (impossibility of operation,erroneous display, etc.) when the power cord is unplugged andplugged in again while the unit is in ON mode with the keypressed or due to other external causes. In this case, execute theprocedure on the right to reset the microcomputer and return theunit to the normal condition.Unplug the power cord from the wall outlet.While holding the (ON/STANDBY) key depressed,plug the power cord into the wall outlet again.Resetting the microcomputer clears the memory you entered andreturns it to the initial condition when the unit left the factory.AccessoriesCautionsFL DISPLAYTUNER UNITK01POWER AMPK02K03K02BD1017815+VH(AMP)-30VAVRKEY MATRIXSTK411-210EIC103STK410-010EIC104Q119-124Q113-118NJM2068DIC113HEADPHONESLRLRSPEAKERCSLSRSW-PRE OUTM62446FPIC107ELECTRIC TONE/VOLUMEBD102IC1017915IC102Q101-VH(AMP)+VL(AMP)-VL(AMP)F1FILAMENT ACFL DISPLAY+5V(u-COM)+10V(PRO LOGIC)+5V(VIDEO SEL)+7V(E.VOL)+15V-15V-5V(VIDEO SEL)-7V(E.VOL)F2IC106(2/2)TC9163ANIC111NJM2068DIC112NJM2068DIC105CDX271AQIC110NJM2068DIC702(2/2)NJM2068DIC603-6ab ATTIC702(1/2)LC7821IC601LC7821IC106(1/2)DOLBYPROLOGICIC108NJM2279SELECTORVIDEOTUNERCDAUXMD PLAYPLAYTAPE/MONITORVIDEO PLAYTAPE/MONITORRECMD RECVIDEO RECVIDEO PLAYVIDEO RECDVD/GCH INPUTMONITOR OUTLRCSLSRSWDVDGCH INPUTIC701u-COMFLT701+MUTELRCSLSRSWCRLSWSRSL-10ab ATT-B LOW TAP-B HI TAP+B LOW TAP+B HI TAPLRCSLRRGRIDREMOCON IN ROTARYENCODERRELAYVIDEO1,VIDEO2,VMUTE E.VOL(DATA,CLK,STB)10ab ATTMUTE TUNER RESET P/L(DATA,CLK,STB)SYNCHRD RDS PROTECTIONSEGMENTKEY SCANKEY RETURNR-V251R-V2513BLOCK DIAGRAMR-V2514CIRCUIT DESCRIPTIONActivePin. No.Pin NameI/ODescriptionHL1,2G1,G2OFL grid control.3PULL UP-Connected to VCC(+5.0V).4POWER DOWNIAC selector.5VOL. UPIVolume encoder A(CW) signal.6RDS CLKIRDS IC(IC703) clock input control.7VOL. DOWNIVolume encoder B(CCW) signal.8RMCIRemote control signal input.9RDS DATAIRDS IC(IC703) data input control.10,11NC-Unused.12PROTECTIONIDetection input port of protection.ON13STEREOIDetection input port of stereo signal for TUNER.STEREO14PLL CEOPLL IC(IC402) CE signal output.15RCVR CLKOSEL. IC(IC601,602,106) clock signal output.16RCVR DATAOSEL. IC(IC601,602,106) data signal output.1719KEY31IKey return 31.20S. DATAI/OSerial communication data.21S. BUSYI/OSerial communication busy.22E.VOL CKOE.volume IC(IC107) clock control.ACTIVE23E.VOL DTOE.volume IC(IC107) data control.24E.VOL STOE.volume IC(IC107) strobe control.ACTIVE25PLL DOIPLL IC(IC402) DO signal.26RCV CEIReceiver chip enable signal.ENABLE27DSP CEODSP IC(IC105) XLAT.28AVREF-Analog power supply(+5.0V).29H/P DETECTIDetection input port of headphones jack.30SDIDetection input port of SD signal for TUNER.TUNED31S. LEVELIA/D input port of signal level.32DSP READYODSP IC(IC105) ready.33DSP DATAODSP IC(IC105) data.34DSP CLKODSP IC(IC105) clock.35OPTIDiscrimination port of model.E,TX36CH.SPACE-Unused.37AVSS-Analog ground.38RESETIu-COM reset.39EXTALIMain clock(10MHz).40XTAL-Main clock(10MHz).41VSS-u-COM ground.42TX-Sub clock(32.768kHz).43TEXISub clock(32.768kHz).44VDD-Power supply(+5.0V).45VFDP-FL power supply(-33V).46T. MUTEOMuting control of TUNER.ON47MAIN MUTEOMuting control of main output.ON48H/P MUTEOMuting control of headphones.ON49VCR MUTEOVIDEO IC(IC108) control.ON50DSP RESETODSP IC(IC105) reset.51RCV. CEIReceiver chip enable signal.52-Unused.53F. RLYOFront speaker relay control.ON54S. RLYOSurround speaker relay control.ON55C. RLYOCenter speaker relay control.ON1. Microprocessor : (FRONT PCB,IC701)1-1. Pin descriptionPin No.NameI/ODescription13T.POTest monitor. Normally outputs Low.(Unused.)4VSSO-Digital GND.58T.POTest monitor. Normally outputs Low.(Unused.)9TSTOIDigital GND.10VDDO-Digital power supply.11VSS1-Digital GND.1215TST14IDigital GND.16XRSTISystem reset input. Reset when Low.17BFOTOUnused.18CSL1IDigital power supply.19CSL2IDigital GND.20VSS2-Digital GND.21AVS3-L-ch DA converter GND.22AVD3-L-ch DA converter power supply.23LOUTOL-ch DA converter output.24AVD1-L-ch AD converter power supply.25AVS1-L-ch AD converter GND.26L01OL-ch AD converter LPF operational amplifier inverted output.27LINIL-ch AD converter analog input.28AVD5-C-ch DA converter power supply.29AVS5-C-ch DA converter GND.30XCOUTOC-ch DA converter output.31AVDX-Analog power supply for master clock.32XTLOOCrystal oscillator circuit output.33XTL1ICrystal oscillator circuit input.34AVSX-Analog GND for master clock.35XSOUTOS-ch DA converter output.36AVS6-S-ch DA converter GND.37AVD6-S-ch DA converter power supply.38RINIR-ch AD converter analog input.39LO2OR-ch AD converter LPF operational amplifier inverted output.40AVS2-R-ch AD converter GND.R-V2515CIRCUIT DESCRIPTIONActivePin. No.Pin NameI/ODescriptionHL56POWER RLYOPower relay control.ON5710dB. ATTOVolume 10dB attenuator control.ON58ST. LEDOSTANDBY LED control(RED).ON59ST. LEDOSTANDBY LED control(GREEN).ON6069-Unused.70779S16SOFL segment(916) and key scan(18) control.78851S8SOFL segment(18) control.8688-Unused.89VDD-u-COM power supply(+5.0V).90,91-Unused.92100G11G03OFL grid control.2. Keymatrix3. Pin description of dolby prologic IC(MAIN PCB IC105)KS1(77pin)KS2(76pin)KS3(75pin)KS4(74pin)KS5(73pin)KS6(72pin)KS7(71pin)KS8(70pin)K1(19pin)MODETUNING -PTYAUTOTIMERTIMER TIMERK2(18pin)MULTI TUNING CLOCK-MODESETTAMEMOK3(17pin)MULTI -INPUT ON/STBYINPUT TAPE2DISPBANDR-V2516CIRCUIT DESCRIPTIONPin No.NameI/ODescription41AVD2-R-ch AD converter power supply.42ROUTOR-ch DA converter output.43AVD4-R-ch DA converter power supply.44AVS4-R-ch DA converter GND.45VSS3-Digital GND.46SCKIShift clock input for microcomputer interface.47REDYOTransfer enabling signal output for microcomputer interface. Transfer prohibited when Low.48T.POUnused.49XLATILatch input for microcomputer interface.50RVDTIData input for microcomputer interface.51XS24ISerial data 24-/32bit slot selection.24-bit slot when Low.(valid for slave mode)52VDD1-Digital power supply.53VSS4-Digital GND.54T.POUnused.55SIIGND.56T.PIGND.57BCKI/OUnused.58LRCKI/OUnused.59VSS5-Digital GND.60XMSTIDigital GND.6163T.POUnused.64VSS6-Digital GND.6572T.POUnused.73VDD2-Digital power supply.74VSS7-Digital GND.7580T.POUnused.IC CHANNELLchRchLchRchLchRchLchRchLchRchLchRchLchRchLchRchIC PORT22732642562372282110191118SURROUND-prologicstereo6ch inputprologicprologic6ch inputprologicSPEAKERFLchFRchFLchFRchFLchFRchSLchSRchSLchSRchSLchSRchCchSWchCchSWchDOLBY PROLOGIC-XXXXDOLBY 3STEREO-XXXXXDSP LOGIC-XXXXXSTEREO-XXXXXXSOURCE DIRECT-XXXXXXX6ch INPUT(6ch)-XXXXX6ch INPUT(2ch)-XXXXXXXIC CHANNELRchchRchchRchchRchchRchchRchchRchchRchchIC PORT1302293284276257249221021INPUT SELECTOR-VCR RECTAPE1/MD REC-MONITORTAPE2 PLAY-ATTCD-X-AUX-X-VCR-X-X-TAPE1/MD-X-X-MONITOR ON-X-XTUNER-X-DVD/6ch INPUT-X-7CIRCUIT DESCRIPTIONR-V2514. Function table4-1. Mode selector: KIC9163AN(IC106)4-2. MODE/ATT selector IC: LC7821(IC602)5. Test modeSetting : While pressing the < INPUT key,plug the AC power cord into the AC wall outlet.All the fluorescent display indicates.(The all-illuminated state is cleared by pressing any main unit keys.)Cancelling: Plug the AC power cord out from the AC wall 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FM-SGAM-SGMPXAGAGAG(A)(D)(C)AC voltmeterOscilloscopeDistortion meterDummy antennaINPUT PCBIC601PIN 30 (Lch)PIN 1 (Rch)8ADJUSTMENTR-V251No.1ITEMDISCRIMINATORINPUT SETTING(A)CARRIER FREQ. : 98.0MHzMOD FREQ.: 1kHzDEVIATION: 75kHzSELECTOR: MONOANT INPUT LEVEL: 60dBuOUTPUTSETTINGConnect aDCvoltmeter toTP401TUNERSETTINGMONO98.0MHzALIGNMENTPOINTST402ALIGN FOR0V±50mVFIG.3TUNED LEVEL(A)CARRIER FREQ. : 98.0MHzMOD FREQ.: 1kHzDEVIATION: 75kHzSELECTOR: MONOANT INPUT LEVEL: 30dBu±5dB-MONO98.0MHzVR401AdjustVR401 andstop at thepoint where(TUNED)goes ON.2DISTORTION(STEREO)(A)CARRIER FREQ. : 98MHzMOD FREQ.: 1kHzDEVIATION: 67.5kHzPILOT: 7.5kHzSELECTOR: L or RANT INPUT LEVEL: 60dBu(B)AUTO98.0MHzT403Minimumdistortion.FM SECTIONBAND : FMTuner adjustmentAM SECTIONBAND : AM1TUNED LEVEL(D)CARRIER FREQ. : 999kHzMOD FREQ.: 1kHz30%DEVSELECTOR: MONOANT INPUT LEVEL: 30dBu±5dB-999kHzVR402AdjustVR402 andstop at thepoint where(TUNED)goes 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