Kenwood-LS47WM-cs-sm 电路图 维修手册.pdf

《Kenwood-LS47WM-cs-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Kenwood-LS47WM-cs-sm 电路图 维修手册.pdf（29页珍藏版）》请在收音机爱好者资料库上搜索。

1、COMPACT Hi-Fi COMPONENT SYSTEM RXD-M47WM-H/M47WM-S LS-M47WM-H/M47WM-S SERVICE MANUAL (HM-437WM) 2005-9 PRINTED IN KOREA B51-5961-00 (K/K) 592 In compliance with Federal Regulations, following are repro- duction of labels on, or inside the product relating to laser product safety. KENWOOD Corp. certi

2、fies this equipment conforms to DHHS Regulations 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,

3、Chassis and 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

4、 parts list on page 26. RadioFans.CN 收音机爱 好者资料库 Remote control unit (1) (A70-1709-08): E type (A70-1710-08): X type AM loop antenna (1) (T90-0908-08) ANT TERMI CVR (F07-2029-08) Batteries (R6/AA) (2) () The marking of products using lasers The marking this product has been classified as Class 1 . It

5、 means that there is no danger of hazardous radiation out- side the product. Location: Bottom CLASS 1 LASER PRODUCT LASER KLASSE 1 APPAREIL A LASER DE CLASSE 1 LUOKAN 1 LASERLAITE KLASS 1 LASERAPPARAT Resetting the Microcomputer The microcomputer may malfunction (unit can- not be operated, or shows

6、an erroneous dis- play) if the power cord is unplugged while the power is ON, or due to some other external factor. If this happens, execute the following procedure to reset the microcomputer and re- turn the unit to its normal operating condition. When the power is on and TUNER input is selected, p

7、ress and hold down the button for more than 2 seconds. Please note that resetting the microcomputer will clear the contents of the memory and return the unit to the state it was in when it left the factory. RXD-M47WM/LS-M47WM 2 ACCESSORIES / CAUTIONS Accessories Cautions System configuration SYSTEMR

8、ECEIVERSPEAKER HM-437WM-H RXD-M47WM-H LS-M47WM-H HM437WM-SRXD-M47WM-S LS-M47WM-S RadioFans.CN 收音机爱 好者资料库 RXD-M47WM/LS-M47WM 3 EXTERNAL VIEW R L SPEAKERS IMPEDANCE: 4 AC FM ANT AM ANT Rubber foot (J02-1563-08)x4 Rear cabinet (A80-4535-08)AM Antenna (E40-8089-08) Speaker terminal (E70-0196-08) AC powe

9、r cord * (E30-) * Refer to parts list on page 26. RadioFans.CN 收音机爱 好者资料库 RXD-M47WM/LS-M47WM 4 DISASSEMBLY FOR REPAIR / BLOCK DIAGRAM DISASSEMBLY INSTRUCTIONS LEFT SURFACE RIGHT SURFACE 1 2 3 4 BOTTOM SURFACE BACK SURFACE LUOKAN 1 LASERLAITE KLASS 1 LASERAPPARAT CLASS 1LASER PRODUCT LASER KLASSE 1 A

10、PPAREIL A LASER DE CLASSE 1 MAN UFACTURED: RISK OF ELECTRIC SHOCK DO N A CAUTION DO NOT OPEN 65 R L SPEAKE RS IMPED ANCE : 4 AC FM ANT AM ANT 10 9 8 7 DETACH REAR CABINET FROM FRONT CABINET MUST BE REMOVED FROM 1 TO 10 SCREWS. BLOCK DIAGRAM MCU U101 U103 M24C16 EEPROM Q803 8.1V CD SUPPLY TO: CD-PCB

11、TO: U601 SC7313S TO: U301 AN7312E TO: U201 TA2104AFN G CPU TO: U260 TC9257F U802 7812 12V LCD KEYMAP REMOTE SENSE MUTE CUT Q801 Q802 U601 SC7313S AUDIO SIGNAL SOURCE SELECTOR EQ MODE SEIECTOR VOLUME CONTROL RDS U250 SC6579A PLL CONTROL FUNCTION CONTROL U260 TC9257F G TAPE PRE. AMP. U301 AN7312E ELEC

12、TRONICE SWITCH TRANSISTORS LOGIC CASS DECK W991S-107G RADIO SECTION U201 SA2104S IC601 CD DSP TC94A14FA IC602 CD RF TA2157FN CD MACHINE TCP11TK2PX IC604 MP3/WMA DECODE TC94A34FG IC603 CD MOTOR DRIVER MM1669XH IC607 LPF SC1308LS IC605 DAC PT8211 FM ANT (PIG TAIL) AM ANT SOCKET AUDIO AMP. U801 BA5415A

13、 D905-D908 F901 3.15A 14.5V MAIN SUPPLY MAIN TRANSFORMER T902 STANDBY TRANSFORMER D901-D904 DC 5V CN801 32 ohm HEADPHONE JACK REMOTE CONTROLLED POWER SECTION RY901 SDT-S-105LMR POWER RELAY 4 ohm IMPEDANCE AUDIO OUT CD SECTION PLAY OUT OF TAPE AC PLUG REC IN RXD-M47WM/LS-M47WM 5 SAFETY Important Note

14、! 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 test receptacle. 4. Switch the unit being tested to

15、 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 than 3 volts on all test points, set the meter to a l

16、ow (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-M47WM 6 ADJUSTMENT SERVICE ADJUSTMENT Lubrication The mechanical parts are

17、factory coated with a thin coat of light grease and should not require further lubrication. If a light grease is applied, be careful not to get any grease on the play/record head or erase head, hubs, pulleys, tapes reels, drive belts, or switches. Use a good lubricant such as Silicon Lube G322L or L

18、ubricate. Service Check Before aligning the mechanism, wipe off any accumulated dirt with denatured alcohol. Wipe around parts where the tape contacts and around all rotating parts. Drive belts are specially processed. Do not clean them with alcohol. Mechanical Torque Use a cassette type torque gaug

19、e and check the tape mechanism. Take-up torque 35 to 70 g-cm Rewind torque 50 g-cm min. Fast forward torque 50 g-cm min. Pinch Wheel Pressure No adjustment to the pinch roller spring is necessary. It should be sufficient to give at least 40 g-cm pull force. Tape Head Servicing Each time the unit is

20、serviced, the face of all heads should be thoroughly cleaned with denatured alcohol or commercial head cleaning solution. The playback head should be demagnetized with a commercial demagnetizer. Accumulation of tape oxide during normal operations can cause problems, including loss of high frequencie

21、s and wow and flutter. Erase Head The erase head is properly aligned when the tape rides directly between the tape guide on the head without crinkling the tape. RXD-M47WM/LS-M47WM 7 ADJUSTMENT Play/Record and Playback Head Azimuth Adjustment To adjust the play/record and playback head azimuth screw:

22、 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.) VTVMVTVM DUMMY LOAD JK801 SCOPE CH1 CH2 Figure 1. Azimuth Adjustment 2. Insert a 10 kHz test tape (Teac MTT-1141V or Equivalent) into the tape mechanism and play it back

23、. 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 Signal RXD-M47WM/LS-

24、M47WM 8 ADJUSTMENT Tape Speed Adjustment 1. 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 COUNTER DUMMY LOAD JK801 Figure 3. Tape Speed Adjustment 3. Insert and play back a 3 kHz test tape (Teac MTT-11

25、1 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 Adjustment 1. Set the function switch to TAPE and the record and play tape mec

26、hanism 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-M47WM 9 ADJUSTMENT TUNER ALIGNMENT PROCEDURE Equipment needed:

27、1. AM Signal generator 2. FM Signal generator 3. DC Voltage meter 4. Oscilloscope 5. Output meter (VTVM) AM Alignment Step 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

28、kHz 30% mod.) Low end 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 a

29、s step 1 VC201 Maximum 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 cm AM SIGNAL GENERATOR AM LOOP ANT AM LOOP ANTENNA DUMMY LOAD TEST UNIT VTVM R-OUT L-OUT GND Figure 4. AM IF/RF Tracking TEST UNIT GROUND METE

30、R Figure 5. AM Band Frequency Coverage Alignment Vt DC RXD-M47WM/LS-M47WM 10 ADJUSTMENT FM 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 me

31、ter to test point Vt and ground L203 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 Repe

32、at steps 3 and 4 to minimize tracking error. FM GENERATOR DUMMY ANTENNA TP1 TEST UNIT OSCILLOSCOPE DUMMY LOAD VTVM R-OUT L-OUT GND Figure 7. FM Band/Tracking GROUND METER Vt DC TEST UNIT RXD-M47WM/LS-M47WM 11 TROUBLE SHOOTING CD Cannot read the table of contents. no display, no sound. Disc is insert

33、ed upside down: Insert disc correctly. Disc is 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. Def

34、ect in the servo control board: Replace or repair 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

35、volume control: Set the volume control to a proper 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 resista

36、nce, voltage, and current. Replace as needed. Defect 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. R

37、eplace if necessary. Poor contact in antenna circuit: 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. R

38、eplace if necessary. Intermediate Frequency tuning 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

39、 cassette tape winding: Replace tape. Defective U301 (AN7312) Check voltages. Replace if necessary. Cassette erasure prevention tabs broken out: Replace tape or cover tab openings with adhesive tape. 12 ABDCE 2 1 3 5 7 4 6 CN605 ZD601 Q604 Q602 CN604 CN603 IC601 IC602 Q605 IC603 IC606 IC604 IC605 IC

40、607 CN606 CN601 Q607 ZD603 CN602 CD R630 R690 C600 EC CE CE R601 C609 C603 C6112 C608 R686 R609 C601 R658 C677 C674 C615 J675 J668 J616 J662 J661 J654 R640 R639 R6383 1 1 11 C676 C675 C6117 C628A C691 C692 C693 C694 C695 C696 C697 C698 R644 R645 R646 R647 R648 R649 R650 R651 J667 R680 C670 C653 C654

41、 J682 C699 J656 C6103 R612 C646 C652 C670A C6119 C655 R662 C645C643 C673 C679 R657 C680 R660 J663 C602 J678 J665 C6101 R605 R602 C611 R604 C686 R611 C6104 C688 C689 C690 C6120 C6113 C605 C678 R661 C610 R683 R684 J650 J612 J648 J642 R614 C685 R613 J619 C6108 C687 R695 J617 J618 C684 J625 J635 J640 C6

42、118 L606 C640 J646 R607 J636 R656 C672 J637 J622 R634 R632 J653 C631 R636 C633 J643 C651R631 C628 R653 C6121 C636 C663 J639 J602 J603 J633 J632 J609 L616 C658 C620 R626 R627 R625 C613 C613A R622 C623 C6109 1 14 1 6 1 1 1 8 5 1 4 8 5 1 4 64 49 48 16 17 3233 64 49 48 33 32 17 16 15 28 12 1 151 162 13

43、24 7 148 C624 C625 R629 J657 C667 L611 J601 R615 J658 J659 C621 C620A C622 R620 R610 B E J613 J660 R672 C6115 C6114 J676 C661 J614 J615 J655 J610 J644 C6106 C660 C659 C606 C668 C604 C618 C6107 C682 R603 C612 L602 13 31 L601 L601A L603 J638 R687 R685 R659 R675 J606 J607 J608 J634 J624 C642 R608 C616

44、C644 J671 R679 C641 C635 C634 C619 R633 C632 R635 C650 R652 R682 R677 R674 R678 C629 C637 C617 R666 R676 R665 C638 C627 C6102 C639 R637 R655 X601 J628 C607 L609 J666 C6111 J649 J670 C649 C648 R663 C614 C630 C623 R619 R618 R617 R616 R621 C624 L615 C6110 J669 R654 J621 R606 J620 J630 L612 L613 J604 J6

45、52 L614 L607 J623 J626 C665 C666 C664 J627 J605 L605 J677 C656 R669 C647 R668 R670 R673 R667 C669 C657 R671 C662 R628 C626 J629 J611 J647 C681 R688 R664 R693 R697 R681 C683 C671 C6100 C6116 Refer to the schematic diagram for the value of resistors and capacitors. PC BOARD (Component side view) FGIKM

46、OHJLN 2 1 3 5 7 4 6 Refer to the schematic diagram for the value of resistors and capacitors. PC BOARD (Component side view) 1413 MAIN HEADPHONE CN806 JK801 CN202 D202 D201 D203 D204 CN801 CN201 CN701 CN260 CN402 Q401 CN401 D401 CN301 CN302 CN804 D305 D304 ZD804 Q806 Q803 U802 Q804 ZD803 ZD802 CN805

47、 CN803 CN802 ZD801 CN602 Q404 D302 Q281 VD202 VD201 VD203 VD205 U801 U301 D803 ZD306 VD204 LR SPEAKERS D904 D902 D901 D903 D907 Q902 D905 CN901 D906 POWER U601 Q801 Q802 Q805 Q807 Q313 Q310 Q308 Q303 Q316 Q312 Q307 Q311 Q309 D802 D303 U201 Q201 Q206 U260 Q403 Q280 Q251 D402 Q323 Q402 U250 Q205 Q204

48、Q207 Q263 Q262 Q252 Q701 Q202 Q702 D701 Q315 Q321 Q319Q317 Q318 Q320 D301 Q306 Q301 Q305 Q302 Q304 Q314 Q203 Q208 Q261 Q260 R243 CF201 CF202 CF203 C249 C207 J209 J228 J249 R222 R279 R257 J224 J215 J227 J202 X260 X250 R255 R416 R332 C266 J242 J238 J219 L201 J222 J231 C820 J226 J230 R722 J251 L810 J23

49、4 J233 C357 J211 J232 J235 L205 L202 T203 J204 L203 R230 J207 VC202 BPF201 L204 L208 T201 VC201 R228 C238T202 J253 C240 R224 R246 R232 R225 C269 J247 J245 J246 C257 J214 C290 C254 R401 R411 C343 C341 C327 C315 C316 C370 J221 R330 J220 C390 R329 J218 J256 TIE1 J217 C719 C725 C726 C707 C705 C801 C809 C803 C816 C810 J237 ICP R816 R821 C830 C833C857 C832 C745 R825 R826 C802 C345 C720 J236 J229 J254 C831 C350 C346 C349 C358 R364 C353 T360 MGND L302 C310 J243 J244