Yamaha-KXE300-tape-sm 维修电路原理图.pdf

SERVICE MANUALI CONTENTSTO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . 2REAR PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . 23SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 3DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4DISASSEMBLY PROCEDURES分解手順 . . . . . 57ADJUSTMENTS調整 . . . . . . . . . . . . . . . . . . . . 812DISPLAY DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1415BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . 16PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . 1720SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . 21PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2333PARTS LIST FOR CARBON RESISTORS . . . . . . . 34This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users,and have therefore not been restated.WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury, destruction of expensivecomponents, and failure of the product to perform as specified. For these reasons, we advise all YAMAHA product owners that any servicerequired should be performed by an authorized YAMAHA Retailer or the appointed service representative.IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or recognition of any applicabletechnical capabilities, or establish a principle-agent relationship of any form.The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service departments of YAMAHAare continually striving to improve YAMAHA products. Modifications are, therefore, inevitable and specifications are subject to change without notice or obligationto retrofit. Should any discrepancy appear to exist, please contact the distributors Service Division.WARNING:Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself tothe ground buss in the unit (heavy gauge black wires connect to this buss).IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.IMPORTANT NOTICE100807SERVICE MANUALKX-E300STEREO CASSETTE DECKKX-E300For the system operation of KX-E300, please refer to Service Manual #100805 for the CRX-E300/NX-E300.本機 動作 、CRX-E300/NX-E300 100805 覧。RadioFans.CN 收音机爱 好者资料库KX-E300KX-E3002I TO SERVICE PERSONNEL1. Critical Components InformationComponents having special characteristics are marked Zand must be replaced with parts having specifications equalto those originally installed.2. Leakage Current Measurement (For 120V Models Only)When service has been completed, it is imperative to verifythat all exposed conductive surfaces are properly insulatedfrom supply circuits.GMeter impedance should be equivalent to 1500 ohm shuntedby 0.15F.GLeakage current must not exceed 0.5mA.GBe sure to test for leakage with the AC plug in bothpolarities.AC LEAKAGETESTER OREQUIVALENTEQUIPMENTUNDER TESTINSULATINGTABLEWALLOUTLETWARNING: CHEMICAL CONTENT NOTICE!The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/orplastic (where applicable) components may also contain traces of chemicals found by the California Health andWelfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FORANY REASON WHATSOEVER!Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumesor expose eyes to solder/flux vapor!If you come in contact with solder or components located inside the enclosure of this product, wash your handsbefore handling food.I REAR PANELSM U, C modelsM B, G modelsRadioFans.CN 收音机爱 好者资料库KX-E300KX-E3003M J modelType型式Auto Reverse4-Track 2-Channel Playback/RecordingStereo Cassette DeckHeadsREC/PBHard permalloyEraseDouble Gap FerriteMotorsMainDC servo motorTray LoadingDC motorWow & FlutterW.PEAK (EIAJ)0.19 %W.RMS0.09 %Fast Winding Time早巻時間about 100 seconds (C-60 tape)Frequency Response総合周波数特性Type I (Normal)30 15,000 Hz 3 dBType II (CrO2)30 16,000 Hz 3 dBType IV (Metal)30 18,000 Hz 3 dBS/N Ratio SN比U, C, B, G models (S : 3rd harmonic distortion 3 %, N : Weighted)NR off58 dBDolby B NR on66 dBDolby C NR on74 dBJ model (S : 0 dB, N : Weighted)NR off54 dBDolby B NR on62 dBDolby C NR on70 dBHarmonic Distortion歪率1.0 %Channel Separation40 dB or moreCrosstalk (125 Hz)55 dB or moreInput Sensitivity/Impedance入力端子Line100 mV/30 kOutput Level出力端子Line570 mV/3.0 kPower Requirements電源電圧U, C modelsAC120 V, 60 HzB, G modelsAC230 V, 50 HzJ modelAC100 V, 50/60 HzPower Consumption消費電力U, C, B, G models12 W (Standby 3W)J model9 W (Standby 3W)Dimensions (W x H x D)寸法（幅X 高 X 奥行）217 x 88 x 291 mm(8-9/16 x 3-7/16 x 11-7/16)Weight重量3.0 kg (6 lbs 10 oz.)Finish仕上Silver colorU, C, B, G, J modelsGold colorU, C, G modelsAccessories付属品Audio Pin Cable x 2, System Control Cable x 1* Specifications are subject to change without notice.U . U.S.A. modelC . Canadian modelB . British modelG. European modelJ. Japanese modelI SPECIFICATIONSDolby noise reduction manufactured under license from DolbyLaboratories Licensing Corporation.“DOLBY” and the double-D symbol V are trademarks of DolbyLaboratories Licensing Corporation.V DOLBY B-C NR実施権基製造。、DOLBY 及 D 記号 V 登録商標。KX-E300KX-E3004I DIMENSIONSI INTERNAL VIEWq MAIN P.C.B. (4)w Cassette Mechanism Unite MAIN P.C.B. (1)r MAIN P.C.B. (2)t MAIN P.C.B. (3)Unit : mm (inch)217 (8-9/16)8 (5/16)80 (3-1/8)88 (3-7/16)6 (3/16)10 (3/8)275 (10-13/16)291 (11-7/16)qertwKX-E300KX-E3005I DISASSEMBLY PROCEDURES分解手順Remove parts in disassembly order as numbered.1. Removal of Top Covera. Remove 4 screws (q) and 4 screws (w) in Fig. 1.b. Lift the Top Cover at the rear and move it rearwardslantingly.2. Removal of Front Panela. Disconnect 2 connectors (CB201 and CB209) in Fig. 2.b. Remove 2 screws (e) and 2 screws (r) in Fig. 1.c. Detach the 2 hooks in Fig. 1 and then pull the FrontPanel forward.3. Removal of Cassette Mechanism Unita. Remove 4 screws (t) in Fig. 1.b. Disconnect 3 connectors (CB1, CB2 and CB3) in Fig. 3.c. Remove the Cassette Mechanism Unit in Fig. 1.1. 外方a. q4 本w4 本外。（Fi g. 1）b. 後方取外。2. 外方a. 2 所 （CB201 、 CB209） 外。（Fi g. 2）b. e2 本r2 本外。（Fi g. 1）c. 2 所外、 前方外。（Fi g. 1）3. 外方a. t4 本外。（Fi g. 1）b. 3 所 （CB1 、 CB2 、 CB3） 外。（Fi g. 3）c. 外。（Fi g. 1）(番号順取外行。）eerttqCassette Mechanism Unit HookFront PanelHookTop CoverwqFig. 1Fig. 2CB201CB209KX-E300KX-E30064. Removal of Cassette Mechanisma. Remove 4 screws (y) in Fig. 3.b. Detach the hook in Fig. 3 and then pull out theCassette Mechanism.5. Removal of Main MotorRemove 2 screws (u) in Fig. 3.6. Removal of Pinch RollerDetach the hook and then remove the Pinch Roller inFig. 4.7. Removal of Head Assya. Remove 1 screw (i) and then remove the RelayP.C.B. in Fig. 4.b. Remove 2 screws (o) and then remove the HeadAssy in Fig. 4.*Perform the azimuth adjustment after installing theHead Assy.CB3CB2CB1F/R BeltMain BeltMain MotorHookyyyyuuHookRelay P.C.BHookPinch Roller (R)Pinch Roller (L)Head AssyoioFig. 3Fig. 44. 外方a. y4 本外。b. 1 所外、 外。（Fi g. 3）5. 外方u2 本外、 外。（Fi g. 3）6. 外方外、 外。（Fi g. 4）7. 外方a. i1 本外、 Relay P. C. B. 外。（Fi g. 4）b. o2 本外、 外。（Fi g. 4） 交換場合、 調整行。KX-E300KX-E3007G a. !0 3 本外。 （Fi g. 5）b. !1 1 本外。 （Fi g. 6）c. !2 2 本!3 1 本外。 （Fi g. 7）d. Mai n P. C. B.外。e. Mai n P. C. B.Fi g. 8置、動作行。G Service Positiona. Remove 3 screws (!0) in Fig. 5.b. Remove 1 screw (!1) in Fig. 6.c. Remove 2 screws (!2) and 1 screw (!3) in Fig. 7.d. Remove the Main P.C.B.e. Place the Main P.C.B. as shown in Fig. 8 and checkthem for operation.Fig. 5Fig. 7Fig. 6Fig. 8MAIN (2)MAIN (1)!0!0!1!2!2!3ClothKX-E300KX-E30081.Before adjustmentGSince head magnetization, dust accumulations, etc.are likely to introduce error in the various characteris-tics, it is very important that the heads are properlydemagnetized and cleaned.GMake adjustments of mechanical system, playbacksystem and recording system in that order.GExcept for azimuth adjustment, adjust in the forwarddirection.2.Instruments requiredGAudio frequency oscillatorGACVM or dual channel (ACVM)GDCVMGWow/flutter meterGOscilloscopeGFrequency counterGTorque meterTW-2111A (TX911580).Take up/back tension (FWD)TW-2121A (TX911570).Take up/back tension (RVS)CT-160L (TX911120) . FF/REW3.Test tape requiredGMTT-111N (TX911650) . Normal speedGMTT-114N (TX911680) . AzimuthGMTT-212N (TX911660) . Playback levelGMTT-256 (TX911300). Playback frequency re-sponse (Normal)GMTT-356 (TX911310). Playback frequency re-sponse (CrO2)GReference tapeType I/Normal (LH) . TDK AC225 (VU167200)Type II/High (CrO2). TDK AC514 (VU167300)Type IV/METAL . TDK AC713 (VU167400)I ADJUSTMENTS調整1. 調整前a. 帯磁汚各測定誤差、 行。b. 調整、調整再生系調整録音系調整順行。c. 調整以外、方向調整。2. 使用測定器G低周波発振器G交流電圧計：ACVMG直流電圧計：DCVMG計GG周波数G各種TW2111A (TX911580) . . . . . . . .（FWD ）TW2121A (TX911570) . . . . . . . .（RVS ）CT 160L (TX911120) . . . . . . . . . . .FF/ REW3. GMTT 111N (TX911650). . . .（3kHz ）GMTT114N (TX911680) . . . .（10kHz ）GMTT212N (TX911660) . . . .再生GMTT256 (TX911300). . . . . . .再生周波数特性（用）GMTT356 (TX911310). . . . . . .再生周波数特性（CrO2 用）GLH () . . . . . . . . . . . . . . . . . . . . .TDK AC225 (VU167200)HIGH (CrO2) . . . . . . . . . . . . . . . . . . . . . . .TDK AC514 (VU167300)METAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TDK AC713 (VU167400)KX-E300KX-E3009TEST MODE (Operation and Display Check)Enter the TEST MODE by pressing the STANDBY/ONbutton while pressing the STOP button and r buttonwhen the power is OFF.（動作）、電源OFF 状態 STOPr 押 STANDBY/ ON 押。DISPLAY (Light all segment)全灯DISPLAY CHECK (Light a segment of each grid)表示（各 1 所点灯）1PLAYPLAYPlayback mode without the cassette tape. (Head cleaning mode)未装着状態再生動作。 （）2STOPSTOPTo stop the playback mode.再生停止。3DIRECTIONDIRECTIONTo change the playback direction in the playback mode.状態時再生方向反転。4rDIMMERTo change concentration of the display in the photograph mode at each pressing of the r button (6 steps).押写真撮影用表示濃度変。 （6 段階）5ePHOTO MODEPhotograph mode. Same display as No.4 but without concentration change.写真撮影NO. 4 同表示。濃度変化。6DOLBY NRAll display segments lit.全灯。7REC/PAUSEVersionTo display the program version and date when pressing the REC/PAUSE button.日付表示。ex. “6121” “0804”8MODEDisplay grid and segments short/open check. (Fig. A is OK)表示。 （Fi g. A 状態正常）9COUNTER RESETEXITTo exit the TEST MODE and return to the normal mode.抜、通常戻。10STANDBY/ONEXITTo exit the TEST MODE and power off.抜、電源 OFF 。NO.BUTTONFUNCTIONACTIONG TEST POINTMAIN (1)VR203VR204RRLLVR201VR202VR101VR103LRVR104MAIN (2)TAPE SPEED ADJ. RECORDING BIAS ADJ. PLAYBACK LEVEL ADJ.RECORDING LEVEL ADJ. Azimuth adjustmentscrew. (REVERSE) Azimuth adjustmentscrew. (FORWARD) Rec out L: ch 1Rec out R: ch 2DC input, X-Y (Resurge) mode NGOK0.2V0.2VFig. AFig. BKX-E300KX-E30010“MECHANICAL ADJUSTMENT”Item to beAdjustedCheck eachtorqueCheck FF, REWtake up timeAzimuthTape SpeedWow/FlutterTapeCT-160L (FF, REW)TW-2111A (FWD)TW-2121A (RVS)AC-514 (C-60)MTT-114N10kHz, 10dBMTT-111N3kHz, 10dBMTT-111N3kHz, 10dBStep12345ModeFF REWPLAYFF REWPLAYPLAYPLAYRatingFF, REW torque : within 70150g/cm.Take up torque : 3070g/cm.Back tension : 1.56g/cm.80 to 120 seconds.Playback output of L and R is maxi-mum and phase difference shouldbe minimum both directions. (Fig. B)*3000 HzLess than 0.19% (WRMS)RemarksAfter the adjustmentmake sure to applyscrew lock paint.Take measurement atabout the center of thetest tape. Perform ad-justment in the forwarddirection and check thetape speed in the re-verse direction.Take measurement atabout the center of thetest tape.InstrumentrequiredTorquemeterACVMOscilloscopeFrequencycounterWow/fluttermeterAdjustmentpartAzimuthadjustmentscrew. (Fig. B)VR101調整調整項目各確認FF 、REW 時間確認確認CT-160L (FF, REW)TW-2111A (FWD)TW-2121A (RVS)AC-514 (C-60)MTT-114N10kHz, 10dBMTT-111N3kHz, 10dBMTT-111N3kHz, 10dBStep12345FF REWPLAYFF REWPLAYPLAYPLAY調整方法規格FF 、REW ：70 150g/cm：30 70g/cm：1.5 6g/cm80 120 秒再生最大左右位相差最小調整。 （Fig.B ）*3000 Hz0.19%（WRMS ）以下備考調整後、必施。中央付近測定。方向調整、方向確認。中央付近測定。測定器ACVM周波数調整箇所調整（Fig.B ）VR101+ 30 - 15+ 30 - 15*交換後、初期特性補 2980 Hz設定。+ 30 - 15* After replacing the motor or cassette mechanism, perform adjustment in the rating of 2980 Hz to compensate the motors initialcharacteristic.+ 30 - 15KX-E300KX-E30011“ELECTRICAL ADJUSTMENT”GUse 560 mV (250 nwb/m) for 0 dB as the standard level of the unit.0dB = 250 nwb/m (315 Hz) = 7 dBV (Rec out level)Item to beAdjustedPlaybacklevel (315Hz)Confirmation ofplayback frequencyresponseStep12Rating 5 dBV 0.3 dBVCheck that the 10kHz playbacklevel is within 0 3 dB of the1kHz playback level. (Fig. C)AdjustmentpartsVR201 (L ch)VR202 (R ch)TapeMTT-212N315Hz,250nwb/mTest tape for frequency check.3180s + 120s (LH) (MTT-256)3180s + 70s (CrO2) (MTT-356)Points ofmeasurementLINE OUTLINE OUTModePLAYPLAYInstrumentrequiredACVMACVMOscilloscopeFig. C 4dB 3.5dB1k 3dB 3dB3k10kHz3152505012.5kHzG PLAYBACK FREQUENCY RESPONSERatingAdjust for equal record andplayback levels.( 25 dBV 0.3 dBV)Adjust for equal record andplayback levels.( 25 dBV 0.5 dBV)Perform recording/playbackand confirm that the fre-quency response shown inFig. D is obtained.If not, perform adjustmentagain at High (CrO2) so thatthe frequency response inFig. D is obtained.Perform recording/playbackand confirm that there is nooutput level difference.( 25 dBV 0.5 dBV)If the value is not as speci-fied, perform adjustmentagain according to Steps 1and 2.Item to beAdjustedRecordinglevelRecordingbias(Total frequency response)Confirmationof recordedlevelStep123Points ofmeasurementLINE OUTLINE OUTLINE OUTModeRECPLAYRECPLAYRECPLAYInstrumentrequiredACVMAudiofrequencyoscillatorACVMAudiofrequencyoscillatorACVMAudiofrequencyoscillatorMeasurementconditionsInput 315 Hz Signalto LINE IN from AudioFrequency Oscillator.Adjust output level ofAudio Frequency Os-cillator so that thevoltage of LINE OUTbecomes 25 dBV.Input 12.5 kHz Signalto LINE IN from AudioFrequency Oscillator.Adjust output level ofAudio Frequency Os-cillator so that thevoltage of LINE OUTbecomes 25 dBV.TapeAC-514High(CrO2)AC-514High(CrO2)AC-225Normal(LH)AC-514High(CrO2)AdjustmentpartsVR203 (L ch)VR204 (R ch)VR103 (L ch)VR104 (R ch)GTOTAL FREQUENCY RESPONSE ( 20 dBV)Dolby NR OFF / B on / C onType I (Normal) / Type II (High) / Type IV (METAL)Fig. D 4dB 4dB1k 3dB 3dB3k10kHz3152505012.5kHzKX-E300KX-E30012録音系調整調整方法 & 規 格録音再生行、出力差。（ 25 dBV 0.3 dBV ）録音再生行、出力差。（ 25 dBV 0.5 dBV ）録音再生行、 Fig D 規格満足確認。満足場合、再度High （CrO2 ）調整行、 Fig D 規格満足。録音再生行、出力差確認。 （ 25 dBV 0.3 dBV ）規格値外場合、 1 、2 再調整。調整項目録音録音録再周波数特性録音確認Step123測定箇所LINE OUTLINE OUTLINE