XR-EM20 K(S),EZ(S) SERVICE MANUAL BASIC TAPE MECHANISM : CMAL5Z213A CD STEREO SYSTEM BASIC CD MECHANISM : KSM-213RDM SYSTEM CD-CASSEIVER SPEAKER XR-EM20 CX-LEM20 SX-LEM20 • This Service Manual is the “Revision Publishing” and replaces “Simple Manual” (S/M Code No. 09-023-454-3T2). S/M Code No. 09-028-454-3R2...
TABLE OF CONTENTS - 1/1 SPECIFICATIONS ................................3 PROTECTION OF EYES FROM LASER BEAM DURING SERVICING ..............4 ACCESSORIES PART LIST .............................. 5 ELECTRICAL PARTS LIST ............................6 ~ 17 CHIP RESISTOR PART CODE ............................18 TRANSISTOR ILLUSTRATION ............................19 SCHEMATIC DIAGRAM - 1/5 (MAIN) ..........................
SPECIFICATIONS - 1/1 MAIN UNIT CX-LEM20 CD PLAYER Semiconductor laser ( λ = 780 nm) Laser TUNER D/A converter 1 bit dual FM tuning range 87.5 MHz to 108 MHz Signal-to-noise ratio 80 dB (1 kHz, 0 dB) FM usable sensitivity (IHF) 16.8 dBf Wow and flutter Unmeasurable FM antenna terminal...
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING - 1/1 CAUTION This set employs laser. Therefore, be sure to follow carefully the instructions below when servicing. Use of controls or adjustments or performance of proce- dures other than those specified herin may result in WARNING!! hazardous radiation exposure.
ACCESSORIES PARTS LIST -1/1 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
ELECTRICAL PARTS LIST -1/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 7
ELECTRICAL PARTS LIST -2/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 8
ELECTRICAL PARTS LIST -3/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 9
ELECTRICAL PARTS LIST -4/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 10
ELECTRICAL PARTS LIST -5/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 11
ELECTRICAL PARTS LIST -6/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 12
ELECTRICAL PARTS LIST -7/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 13
ELECTRICAL PARTS LIST -8/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 14
ELECTRICAL PARTS LIST -9/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 15
ELECTRICAL PARTS LIST -10/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 16
ELECTRICAL PARTS LIST -11/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Page 17
ELECTRICAL PARTS LIST -12/13 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
ELECTRICAL PARTS LIST -13/13 • Regarding connectors, they are not stocked as they are not the initial order items. The connectors are available after they are supplied from connector manufacturers upon the order is received. CHIP RESISTOR PART CODE Chip Resistor Part Coding Figure Resistor Code Value of resistor...
TRANSISTOR ILLUSTRATION - 1/1 2SA1162GR 2SK2158 2SK360E 2SC2620QB 2SC2712GR 2SC2714O 2SC3052 2SD1306 DTA114EK DTA124EK DTC144EKA DTC114EK RT1P141 SRA2207S B C E B C E B C E 2SA1296GR 2SA1981Y 2SC5343GL 2SA1980G 2SC5343SF/S B C E 2SB1370E -19-...
WIRING - 1/7 (MAIN) <1/2> MAIN C.B J104 (COMPONENT SIDE) PHONES E / RP HEAD J103 SPEAKERS SPEAKER IMP : 6 R452 J101 CNA351 SUB WOOFER AUX IN NOTE : RXXX LXXX (RCH) C471 FBXXX (LCH) CXXX CXXX CXXX CXXX LXXX E C B QXXX...
SCHEMATIC DIAGRAM - 5/5 (TUNER) Q901 FM RF AMP TUNER C.B Q902 FM MIXER L901,L902,L904,L905 FM TRACKING ADJ. Q905 BUFFER Q903,Q904 FM OSC L907 Q835 FM IF AMP L907 FM VTADJ. Q836 L802 SRA2207S AM IF ADJ FM +B SW J832 FM75Ω...
IC DESCRIPTION - 1/6 (LC78622NE) - 1/2 Description Pin No. Pin Name DEFI Defect detection signal (DEF) input. ("L" is applied when not used.) For PLL/Test input. (Connected to 0V) Phase comparison output to control the external VCO. VVSS – Ground of the built-in VCO.
Page 34
IC DESCRIPTION - 2/6 (LC78622NE) - 2/2 Pin Name Description Pin No. RCHO Rch output. RVDD – Rch power supply. MUTE-R Rch muting output. (Not used) XVDD – Power supply of crystal oscillator. XOUT For the connection of a 16.934MHz crystal oscillator. XVSS –...
Page 35
IC DESCRIPTION - 3/6 (LA9241ML) - 1/2 Description Pin No. Pin Name For the connection of the pickup photodiode. Addition to the FIN1 pin creates an RF FIN2 signal and subtraction from it create an EF signal. FIN1 For the connection of the pickup photodiode. For the connection of the pickup photodiode.
Page 36
IC DESCRIPTION - 4/6 (LA9241ML) - 2/2 Pin No. Pin Name Description SLOF Sled servo off control input. CV– CLV error signal input from the DSP. RFSM RF output. RFS– Sets the RF gain and the EFM signal's 3T compensation constant together with the RFSM pin. The SLC (slice level control) signal is output to control the DSP's data slice level of the RF waveform.
Page 37
IC DESCRIPTION - 5/6 (LC876748A-5Z32) - 1/2 Pin No. Pin Name Description O-COCK CD control Q code clock signal output. O-RWC CD control command LAT signal output. O-CDIN CD control command data signal output. I-WRQ CD control SCOR signal input. I-DRF CD control focus OK input.
Page 38
IC DESCRIPTION - 6/6 (LC876748A-5Z32) - 2/2 Pin No. Pin Name Description VDD4 – Digital power supply pin. D-VDD – Not used. EZK-VDD – Not used. IN-ECO Not used. 76 ~ 84 – Not connected. KSCAN1 Initial scan I/P. O-MUTE Mute signal output.
ADJUSTMENT (FRONT/DECK/TUNER/CD) - 1/8 <FRONT SECTION> FRONT PWB PART SIDE PATTERN SIDE IC301 L301 1. CLOCK ADJUSTMENT Requirements Test point: TP1(IC301 85pin), GND Adjustment point: L301 1) While pressing and holding down the POWER button and the TUNER / BAND button, insert the AC plug to outlet.
Page 41
ADJUSTMENT (FRONT/DECK/TUNER/CD) - 2/8 <DECK SECTION> MAIN PWB PART SIDE HEAD C651 C652 DECK MECHANISM L451 MOTOR J231 1.TAPE SPEED ADJUSTMENT Requirements Measuring equipments : wow-flutter meter (frequency counter ) Test Tape: TTA-100 (3KHz) Test point: C651(Lch),C652(Rch),GND WOW&FLUTTER METER Adjustment point : Tape speed adjustment point (motor) 1) Connect Test point to the Wow - flutter meter.
Page 42
ADJUSTMENT (FRONT/DECK/TUNER/CD) - 3/8 3.HEAD AZIMUTH ADJUSTMENT Requirements Measuring equipment: Oscilloscope Test Tape: TTA-330 (8KHz) Test point: C651(Lch),C652(Rch),GND OSCILLOSCOPE Adjustment point: Head azimuth screw 1) Connect the Test point to the oscilloscope of CH1 and CH2. OUTPUT 2) Set the V mode of the oscilloscope to ADD. 3) Insert the test tape (TTA-330) , play back the center of the tape and adjustment the head azimuth screw until the waveform of the oscilloscope has reached the maximum when playing back at 10KHz.
Page 43
ADJUSTMENT (FRONT/DECK/TUNER/CD) - 4/8 <TUNER SECTION> PATTERN SIDE PATTERN SIDE PART SIDE 1211 8 CN991 CN991 %^& L954 L955 (LCH) IC991 L941 (RCH) L942 & TC942 L905 L902 R962 TP1(24pin) R815 IC801 IC801 L904 L802 L903 L907 L901 L801 1.CLOCK CHECK Requirements Measuring equipment: Frequency counter FREQUENCY COUNTER...
Page 44
ADJUSTMENT (FRONT/DECK/TUNER/CD) - 5/8 < AM ADJUSTMENT> For AM adjustment, do wiring and connection as in the following. 60cm Standerd Signal Generaor Connect to the respective measuring equipment 5.IF ADJUSTMENT Requirement OSCILLOSCOPE Measuring equipment: Oscilloscope or Millivoltmeter Test point: TP8(Lch), TP9(Rch), GND Adjustment point: L802 (1) Adjust the setting of Standard Signal Generator (hereinafter S.S.G.) to 999KHz of 30% variation.
Page 45
ADJUSTMENT (FRONT/DECK/TUNER/CD) - 6/8 6.TRACKING ADJUSTMENT (LW) Requirement AC MILLIVOLTMETER Measuring equipment: Millivoltmeter Test point: TP8(Lch), TP9(Rch), GND Adjustment point: L941, TC942 (8) Adjust the S.S.G. setting to 144KHz of 30% variation and reduce the output level all the way (till a certain degree of is monitored through the oscilloscope). (9) Adjust the reception frequency of the main unit to 144KHz.
Page 46
ADJUSTMENT (FRONT/DECK/TUNER/CD) - 7/8 <CD SECTION> PATTERN SIDE CD PWB PART SIDE !@#$ Vref Vref SFR501 Perform the adjustments after the main unit enters the test mode. Place the CD mechanism on level ground. Equipment and tools required Measuring equipment Digital multi-meter Jitter meter (KIKUSUI 6235) Test disc: TCD-782...
Page 47
ADJUSTMENT (FRONT/DECK/TUNER/CD) - 8/8 3.JITTER CHECK 1) While oscilloscope is kept connected in the same test point as in OSCILLOSCOPE step2. RF WAVEFORM CHECK, connect the output terminal of an oscilloscope to the input terminal of the jitter meter. JITTER METER 2) Set the VOLT range selector of oscilloscope to 500mV range or OUTPUT INPUT...
CD TEST MODE - 1/1 1. How to Start the CD Test Mode While pressing the CD FUNCTION button, insert the AC plug to the power outlet. When the test mode started, the message [CD TEST] is displayed. 2. How to Exit the CD Test Mode Press the POWER button or disconnect the AC plug.
MECHANICAL PARTS LIST -1/1 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
COLOR NAME TABLE -1/1 Basic color symbol Color Basic color symbol Color Basic color symbol Color Black Cream Orange Green Gray Blue Transparent Blue Gold Pink Silver Titan Silver Brown Violet White Transparent White Yellow Transparent Yellow Metallic Blue Light Blue Transparent Green Dark Blue Transparent Orange...
TAPE MECHANISM PARTS LIST - 1/1 (CMAL5Z213A) = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
OTHER PARTS LIST -1/1 = ! SAFTY PARTS = Components marked All components used on this model at the production line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
GENERAL SPEAKER DISASSEMBLY INSTRUCTIONS (FOR REFERENCE) - 1/1 Type.1 Type.4 Insert a flat-bladed screwdriver into the position indicated by the TOOLS arrows and remove the panel. Remove the screws of each speaker 1 Plastic head hammer unit and then remove the speaker units. 2 (() flat head screwdriver 3 Cut chisel How to Remove the PANEL, FR...
Components marked X and R are not designated as spare parts for after sales service, and will not be stocked at the spare parts centers. UNIT-NAME ! C REF-NO PARTS-NO PARTS-NAME SUFFIX&MODEL SX-SLEM20 YJMN 8B-CPX-016-010 BADGE,AIWA 27.5 8C-CP5-005-010 TUBE, 8C-CP5-007-010 CORD,SPKR O 8C-CP5-008-010 CORD,BUSH O 8C-CP6-602-010 SPKR, 100 16/2 8C-CP7-001-010 CABI,M 8C-CP7-002-010 GRILLE,FRAME ASSY...
Page 62
2-11, IKENOHATA 1-CHOME, TAITO-KU, TOKYO 110-8710, JAPAN TEL:03 (3827) 3111 H251941...