Kenwood-LS47WM-cs-sm 维修电路原理图.pdf

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1、COMPACT Hi-Fi COMPONENT SYSTEMRXD-M47WM-H/M47WM-SLS-M47WM-H/M47WM-SSERVICE MANUAL(HM-437WM) 2005-9 PRINTED IN KOREAB51-5961-00 (K/K) 592In compliance with Federal Regulations, following are repro-duction of labels on, or inside the product relating to laserproduct safety.KENWOOD Corp. certifies this

2、 equipment conforms to DHHSRegulations No.21 CFR 1040. 10, Chapter 1, subchapter J.DANGER : Laser radiation when open and interlock defeated. AVOID DIRECT EXPOSURE TO BEAM.Caution : No connection of ground line if disassemble the unit. Please connect the ground line on rear panel, PCBs, Chassis and

3、some others.CD cover assy *(F07-)Phone jack(E63-1365-08)Power knob(K29-8499-08)Display/Rec. knob(K29-8501-08)Search knob(K29-8503-08)Cass lid assy *(A53-)Front cabinet *(A60-)Volume knob(K29-8502-08)CD/Tuner/Tape knob(K29-8504-08)EQ/Bass knob(K29-8500-08).* Refer to parts list on page 26.RadioFans.C

4、N 收音机爱 好者资料库Remote control unit (1)(A70-1709-08): E type(A70-1710-08): X typeAM loop antenna (1)(T90-0908-08)ANT TERMI CVR(F07-2029-08)Batteries (R6/AA) (2)()The marking of products using lasersThe marking this product has been classified as Class 1 . Itmeans that there is no danger of hazardous rad

5、iation out-side the product.Location: BottomCLASS 1 LASER PRODUCTLASER KLASSE 1APPAREIL A LASER DE CLASSE 1LUOKAN 1 LASERLAITEKLASS 1 LASERAPPARATResetting the MicrocomputerThe microcomputer may malfunction (unit can-not be operated, or shows an erroneous dis-play) if the power cord is unplugged whi

6、le thepower is ON, or due to some other externalfactor. If this happens, execute the followingprocedure to reset the microcomputer and re-turn the unit to its normal operating condition.When the power is on and TUNER input isselected, press and hold down the buttonfor more than 2 seconds.Please note

7、 that resetting the microcomputerwill clear the contents of the memory andreturn the unit to the state it was in when itleft the factory.RXD-M47WM/LS-M47WM2ACCESSORIES / CAUTIONSAccessoriesCautionsSystem configurationSYSTEMRECEIVERSPEAKERHM-437WM-H RXD-M47WM-H LS-M47WM-HHM437WM-SRXD-M47WM-S LS-M47WM

8、-SRadioFans.CN 收音机爱 好者资料库RXD-M47WM/LS-M47WM3EXTERNAL VIEWRLSPEAKERSIMPEDANCE:4 ACFM ANTAM ANTRubber foot(J02-1563-08)x4Rear cabinet(A80-4535-08)AM Antenna(E40-8089-08)Speaker terminal(E70-0196-08)AC power cord *(E30-)* Refer to parts list on page 26.RXD-M47WM/LS-M47WM4DISASSEMBLY FOR REPAIR / BLOCK

9、DIAGRAMDISASSEMBLY INSTRUCTIONS LEFT SURFACE RIGHT SURFACE 1234BOTTOM SURFACE BACK SURFACE LUOKAN 1 LASERLAITEKLASS 1 LASERAPPARATCLASS 1LASER PRODUCTLASER KLASSE 1APPAREIL A LASER DE CLASSE 1MAN UFACTURED:RISK OF ELECTRIC SHOCKDONACAUTIONDO NOT OPEN65RLSPEAKE RSIMPED ANCE :4 ACFM ANTAM ANT10987DETA

10、CH REAR CABINET FROM FRONT CABINET MUST BE REMOVED FROM 1 TO 10 SCREWS.BLOCK DIAGRAM MCUU101U103M24C16EEPROMQ8038.1V CD SUPPLYTO: CD-PCBTO: U601 SC7313STO: U301 AN7312ETO: U201 TA2104AFN GCPUTO: U260 TC9257FU802 781212VLCDKEYMAPREMOTESENSEMUTE CUTQ801 Q802U601SC7313SAUDIO SIGNAL SOURCE SELECTOREQ MO

11、DE SEIECTORVOLUME CONTROLRDSU250 SC6579APLL CONTROLFUNCTION CONTROLU260 TC9257F GTAPE PRE. AMP.U301 AN7312EELECTRONICESWITCHTRANSISTORSLOGICCASS DECKW991S-107GRADIO SECTIONU201 SA2104SIC601CD DSPTC94A14FAIC602CD RFTA2157FNCD MACHINETCP11TK2PXIC604MP3/WMA DECODETC94A34FGIC603CD MOTOR DRIVERMM1669XHIC

12、607LPFSC1308LSIC605DACPT8211FM ANT (PIG TAIL)AM ANTSOCKETAUDIO AMP.U801BA5415AD905-D908F901 3.15A14.5V MAIN SUPPLYMAIN TRANSFORMERT902STANDBYTRANSFORMERD901-D904DC 5VCN80132 ohmHEADPHONEJACKREMOTE CONTROLLEDPOWER SECTIONRY901SDT-S-105LMRPOWER RELAY4 ohm IMPEDANCEAUDIO OUTCD SECTIONPLAY OUT OF TAPEAC

13、 PLUGREC INRXD-M47WM/LS-M47WM5SAFETYImportant Note! Do the following safety checks after servicing this unit. 1. Remove all the externally connected test equipment and wires before testing the unit. 2. Use the safety test circuit as shown below. 3. Plug the power cord or unit to be tested into the t

14、est receptacle. 4. Switch the unit being tested to ON or PLAY. 5. Connect external jack/terminal contact VTVM across a 1k resistor in the test circuit. Set the meter to a high (150V AC) scale to avoid meter damage and then touch the points with the test probe. If the meter reading indicates less tha

15、n 3 volts on all test points, set the meter to a low (3V AC) scale and repeat the test. 6. Any reading greater than 0.2 volt indicates a potential shock hazard. If this occurs, determine the cause of the leakage, correct the problem, and repeat the safety test. RXD-M47WM/LS-M47WM6ADJUSTMENTSERVICE A

16、DJUSTMENTLubricationThe mechanical parts are factory coated with a thin coat of light grease and should not require furtherlubrication. If a light grease is applied, be careful not to get any grease on the play/record head or erasehead, hubs, pulleys, tapes reels, drive belts, or switches. Use a goo

17、d lubricant such as Silicon Lube G322Lor Lubricate.Service CheckBefore aligning the mechanism, wipe off any accumulated dirt with denatured alcohol. Wipe around partswhere the tape contacts and around all rotating parts. Drive belts are specially processed. Do not cleanthem with alcohol.Mechanical T

18、orqueUse a cassette type torque gauge and check the tape mechanism.Take-up torque 35 to 70 g-cmRewind torque 50 g-cm min.Fast forward torque 50 g-cm min.Pinch Wheel PressureNo adjustment to the pinch roller spring is necessary. It should be sufficient to give at least 40 g-cm pullforce.Tape Head Ser

19、vicingEach time the unit is serviced, the face of all heads should be thoroughly cleaned with denatured alcohol orcommercial head cleaning solution. The playback head should be demagnetized with a commercialdemagnetizer. Accumulation of tape oxide during normal operations can cause problems, includi

20、ng loss ofhigh frequencies and wow and flutter.Erase HeadThe erase head is properly aligned when the tape rides directly between the tape guide on the head withoutcrinkling the tape.RXD-M47WM/LS-M47WM7ADJUSTMENTPlay/Record and Playback Head Azimuth AdjustmentTo adjust the play/record and playback he

21、ad azimuth screw:1. Connect two (2) VTVMs and a dual trace scope to the stereo headphone jack (as shown) with a 32 ohm dummy load. (See Figure 1.)VTVMVTVMDUMMY LOAD JK801SCOPECH1CH2 Figure 1. Azimuth Adjustment2. Insert a 10 kHz test tape (Teac MTT-1141V or Equivalent) into the tape mechanism and pl

22、ay it back.3. While playing back the test tape, slowly turn the azimuth adjusting screw until the amplitude of both channel output waveforms is maximum and in phase. (See Figure 2.)4. Secure the azimuth screw in place with glue or paint after making the adjustment. Figure 2. Head Output SignalRXD-M4

23、7WM/LS-M47WM8ADJUSTMENTTape Speed Adjustment1. Set the function switch to TAPE.2. Connect a frequency counter with a 32 ohm dummy load to the stereo headphone jack. (See Figure 3.) FREQUENCY COUNTERDUMMY LOADJK801Figure 3. Tape Speed Adjustment 3. Insert and play back a 3 kHz test tape (Teac MTT-111

24、 or Equivalent) into the tape mechanism.4. Insert an insulated alignment tool and adjust the tape speed potentiometer (MOTOR) until the frequency counter indicates 2940 Hz to 3090 Hz.Bias Oscillator Frequency and Level Adjustment1. Set the function switch to TAPE and the record and play tape mechani

25、sm to RECORD.2. Connect a VTVM and frequency counter to test point R/P HEAD.3. Adjust bias oscillator coil T360 until the frequency counter indicates 100 kHz 0.5 kHz.4. Confirm the record head voltage equal to: 4-8V.RXD-M47WM/LS-M47WM9ADJUSTMENTTUNER ALIGNMENT PROCEDUREEquipment needed:1. AM Signal

26、generator2. FM Signal generator3. DC Voltage meter4. Oscilloscope5. Output meter (VTVM)AM AlignmentStep S/G Frequency Dial SettingIndicator Adjust Remarks 1 450 kHz (1 kHz 30% mod.) 612 kHz Connect oscilloscope or VTVM to speaker jack T201 Adjust until maximum output 2 531 kHz (1 kHz 30% mod.) Low e

27、nd Connect DC voltage meter to test point Vt and ground T202 Adjust until Vt equal to 1.5 0.05V 3 1602 kHz (1 kHz 30% mod.) High end Same as step 2 Confirm Vt: 6.58.5V 4 612 kHz (1 kHz 30% mod.) 612 kHz Same as step 1 T203 Maximum output 5 1404 kHz (1 kHz 30% mod.) 1404 kHz Same as step 1 VC201 Maxi

28、mum output 6 Repeat steps 4 and 5 to minimize tracking error 7 999 kHz (1 kHz 30%mod.) 999 kHz Same as step 1 Offset is less than 6 dB. 60 cmAM SIGNAL GENERATORAM LOOP ANTAM LOOPANTENNADUMMY LOADTEST UNITVTVMR-OUTL-OUTGND Figure 4. AM IF/RF Tracking TEST UNIT GROUND METERFigure 5. AM Band Frequency

29、Coverage Alignment Vt DC RXD-M47WM/LS-M47WM10ADJUSTMENTFM Alignment: Figure 6. FM Band Frequency Coverage Alignment Connect FM S/G to ANT inputs (mod 1 kHz 22.5kHz dev.) Step S/G Frequency Dial Setting Indicator Adjust Remarks 1 87.5 MHz Low end Connect DC voltage meter to test point Vt and ground L

30、203 Adjust until Vt equal to: 2.5 0.05V 2 108 MHz High end Same as step 1 Confirm Vt: 7-9V 3 90.1 MHz 90.1 MHz Connect oscilloscope or VT/VM to speaker jack L204 Adjust until Maximum output 4 106.1 MHz 106.1 MHz Same as step 3 VC202 Adjust until maximum output 5 Repeat steps 3 and 4 to minimize trac

31、king error. FM GENERATORDUMMYANTENNATP1TEST UNITOSCILLOSCOPEDUMMY LOADVTVMR-OUTL-OUTGND Figure 7. FM Band/Tracking GROUND METERVt DC TEST UNIT RXD-M47WM/LS-M47WM11TROUBLE SHOOTINGCD Cannot read the table of contents. no display, no sound. Disc is inserted upside down: Insert disc correctly. Disc is

32、dirty: Wipe clean with a soft cloth. Disc is scratched: Use a new disc. Disc is seriously warped: Use a new disc. A non-standard disc has been inserted: Use only a brand name disc. Moisture has formed inside the CD deck: Wait about 20 to 30 minutes. Defect in the servo control board: Replace or repa

33、ir as required. Defect in the CD pickup mechanism: Replace as required. Circuit Symptom Cause and Remedy General No sound Speakers are not connected: Check the speaker connection. Wrong function is selected: Set switch to the proper position. Defective volume control: Set the volume control to a pro

34、per sound level. Defective earphone jack: Replace the earphone jack. Mute function is active: Release it by remote control. AM No sound, weak sound (Low sensitivity) Improper location of unit: Rotate or reposition the unit. Defect in T203: Check resistance, voltage, and current. Replace as needed. D

35、efect AM antenna loop or oscilloscope coil: Replace if necessary. Intermediate Frequency tuning faulty: Readjust (see “Alignment and Adjustment”). RF tracking faulty: Readjust (see “Alignment and Adjustment”). Defective U201 (SA2104S): Check voltages. Replace if necessary. Poor contact in antenna ci

36、rcuit: Check resistance and resolder. FM No sound, weak sound (Low sensitivity) FM antenna not connected: Connect the built-in or external antenna. Defective band selector switch: Replace or repair the switch. Defective U201 (SA2104S): Check voltages. Replace if necessary. Intermediate Frequency tun

37、ing faulty:. Readjust (see “Alignment and Adjustment”). Poor contact in FM antenna circuit: Resolder or repair as required. Tape No sound/recording, unsteady tape sound, weak sound Dirty capstan or head: Clean the capstan or head with alcohol. Irregular cassette tape winding: Replace tape. Defective

38、 U301 (AN7312) Check voltages. Replace if necessary. Cassette erasure prevention tabs broken out: Replace tape or cover tab openings with adhesive tape. 12ABDCE2135746CN605ZD601Q604Q602CN604CN603IC601IC602Q605IC603IC606IC604IC605IC607CN606CN601Q607ZD603CN602CDR630R690C600ECCECER601C609C603C6112C608R

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43、57R671C662R628C626J629J611J647C681R688R664R693R697R681C683C671C6100C6116Refer to the schematic diagram for the value of resistors and capacitors.PC BOARD (Component side view)FGIKMOHJLN2135746Refer to the schematic diagram for the value of resistors and capacitors.PC BOARD (Component side view)1413M

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