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JVC MX-KB2 Service Manual

Compact component system
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SERVICE MANUAL
COMPACT COMPONENT SYSTEM
8
2004
MB284
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
MX-KB2,MX-KB1

TABLE OF CONTENTS

COPYRIGHT © 2004 Victor Company of Japan, Limited
Area suffix
UW ----------- Brazil,Mexico,Peru
No.MB284
2004/8

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  • Page 1: Table Of Contents

    SERVICE MANUAL COMPACT COMPONENT SYSTEM MB284 2004 MX-KB2,MX-KB1 Area suffix UW ----------- Brazil,Mexico,Peru TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION 30 W per channel, min. RMS, driven into 6 Ω at 1kHz, with no more than Amplifier Output Power 10% total harmonic distortion (IEC 268-3) Input Sensitivity/Impedance (1 kHz) AUX IN:500 mV/51 kΩ 6 - 16 Ω Speaker terminals 32 Ω...

  • Page 3: Precaution

    SECTION 1 PRECAUTION Safety Precautions (1) This design of this product contains special hardware and voltmeter. many circuits and components specially for safety purpos- Move the resistor connection to each exposed metal es. For continued protection, no changes should be made part, particularly any exposed metal part having a return to the original design unless authorized in writing by the path to the chassis, and measure the AC voltage across...
  • Page 4 Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 1.5.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.

  • Page 5: Important For Laser Products

    Important for laser products 5.CAUTION : If safety switches malfunction, the laser is able 1.CLASS 1 LASER PRODUCT to function. 2.DANGER : Invisible laser radiation when open and inter 6.CAUTION : Use of controls, adjustments or performance of lock failed or defeated. Avoid direct exposure to beam. procedures other than those specified here in may result in 3.CAUTION : There are no serviceable parts inside the hazardous radiation exposure.

  • Page 6: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. 1-6 (No.MB284)

  • Page 7: Disassembly

    SECTION 3 DISASSEMBLY Main body 3.1.1 Removing the top cover / side cover (R) and (L) (See Fig.1 to 6) (1) From the back of the body, remove the two screws A at- Top cover taching the top cover. (2) From both sides of the body, remove the four screws B at- taching the top cover and the side cover (R) and (L).

  • Page 8: No.mb284)1

    Front panel assembly Side cover (L) Side cover (R) Side cover (L) Fig.5 Fig.3 Front panel assembly Side cover (R) Joint Fig.6 Fig.4 1-8 (No.MB284)
  • Page 9 3.1.2 Removing the CD fitting (See Fig.7 to 9) • Prior to performing the following procedure, remove the top cover / side cover (R) and (L). CD tray Caution: For preventing from damage, make sure to remove the CD fit- ting before detaching the CD changer mechanism unit.
  • Page 10 3.1.4 Removing the CD changer mechanism unit (See Fig.11 to 16) • Prior to performing the following procedure, remove the top CD changer mechanism unit Rear panel cover / side cover (R) and (L), and the CD fitting. (1) Disconnect the wire from connector CN601 on the turner board on the right side of the body.
  • Page 11 CD changer mechanism unit AUX board CN504 Main board CN207 CN103 CN101 CN100 Fig.15 Rear panel Front panel assembly Fig.13 CD changer mechanism unit CN801 Fig.16 CN802 Power board CN803 Fig.14 (No.MB284)1-11...
  • Page 12 3.1.5 Removing the tuner board (See Fig.17, 18) • Prior to performing the following procedure, remove the top cover / side cover (R) and (L). (1) Disconnect the wire from connector CN601 on the tuner board. (2) From the back of the body, remove the two screws H, the two screws J and the two screws K attaching the tuner board respectively.
  • Page 13 3.1.6 Removing the speaker terminal board (See Fig.19, 20) • Prior to performing the following procedure, remove the top cover / side cover (R) and (L). (1) Disconnect the wire from connector CN901 on the speaker terminal board. (2) From the back of the body, remove the two screws M at- taching the speaker terminal board.
  • Page 14 3.1.7 Removing the front panel assembly (See Fig.21 to 24) • Prior to performing the following procedure, remove the top Rear panel cover / side cover (R) and (L), the CD fitting / CD changer mechanism unit. (1) Disconnect the wire from connector CN861 on the power board.
  • Page 15 Front panel assembly Fig.23 Front panel assembly Fig.24 (No.MB284)1-15...
  • Page 16 3.1.8 Removing the POWER switch board / CD switch board (See Fig.25, 26) • Prior to performing the following procedure, remove the front Bracket panel assembly. (1) Remove the two screws P and the three screws Q attach- ing the bracket. (2) Remove the screws R attaching the POWER switch board.
  • Page 17 3.1.10 Removing the LCD board / STANDBY board (See Fig.28, 29) • Prior to performing the following procedure, remove the front Front panel assembly panel assembly. (1) Remove the four screws A’ attaching the LCD board and CN505 disconnect the wire from connector CN505. (2) Remove the two screws B’...
  • Page 18 3.1.11 Removing the system board / headphone board / AUX board (See Fig.30 to 34) • Prior to performing the following procedure, remove the front Front panel assembly panel assembly. (1) Pull out the volume knob on the front side of the front panel assembly.
  • Page 19 Front panel assembly Cassette mechanism assembly Front panel assembly Fig.34 Fitting plate Headphone board Fig.32 Front panel assembly Fitting plate AUX board Fig.33 (No.MB284)1-19...
  • Page 20 3.1.12 Removing the cassette mechanism assembly (See Fig.35) • Prior to performing the following procedure, remove the front Rear cover panel assembly. (1) Remove the six screws G’ attaching the cassette mecha- nism assembly. Rear panel Fig.35 1-20 (No.MB284)
  • Page 21 3.1.13 Removing the rear cover / rear panel (See Fig.36 to 38) • Prior to performing the following procedure, remove the top Rear panel cover / side cover (R) and (L), the CD fitting / CD changer mechanism unit. (1) From the back of the body, remove the four screws H’ at- taching the rear cover.
  • Page 22 3.1.14 Removing the heat sink / power board (See Fig.39 to 42) • Prior to performing the following procedure, remove the top cover / side cover (R) and (L), the CD fitting / CD changer Heat sink mechanism unit, the rear cover / rear panel. (1) From the inner side of the rear panel, remove the four screws K’...
  • Page 23 3.1.15 Removing the power transformer assembly (See Fig.43) • Prior to performing the following procedure, remove the top Power transformer cover / side cover (R) and (L), the CD fitting / CD changer mechanism unit and the rear cover / rear panel. (1) Move the cord stopper in the direction of the arrow and dis- connect the power cord.
  • Page 24 3.1.16 Removing the main board (See Fig.44 to 46) • Prior to performing the following procedure, remove the top cover / side cover (R) and (L), the CD fitting / CD changer Main board mechanism unit. Caution: Before disconnecting the card wire from the CD pickup board CD changer and connector CN401...
  • Page 25 Speaker 3.2.1 Removing the front cabinet (See Fig.1 to 3) Caution: Boss When performing the following procedure, apply the cloth to Boss the product for preventing it from damage. (1) Put the screwdriver into the two notch a at the bottom of the speaker, and remove the front panel assembly while pull- ing out the six bosses on the inner side of the front panel assembly forward.
  • Page 26 3.2.2 Removing the main speaker / sub speaker (See Fig.4) • Prior to performing the following procedure, remove the front Sub speaker cabinet. (1) Remove the four screws A attaching the main speaker. (2) Remove the two screws B attaching the sub speaker. Main speaker Fig.4 1-26 (No.MB284)

  • Page 27: Adjustment

    SECTION 4 ADJUSTMENT Measurement Instruments Required for Adjustment (1) AM signal generator (2) FM signal generator (3) Intermadiate frequency sweep generator (4) FM stereo signal generator (5) Low-frequency oscillator (oscillation frequency 50Hz-20kHz, 0dB output with 600 Ω impedance) (6) Attenuator (600 Ω impedance) (7) Electrinic voltmeter (8) Distortion meter (9) Wow &...
  • Page 28 Cassette amp section Item Measuring condition Check and adjustment procedure Standard value Adjusting part Head azimuth Test tape : VT703L 1. Playback the test tape VT703L. Output level : Head azimuth adjustment Signal output terminal : 2. Adjust the head azimuth adjusting screw so Within (2 dB of adjusting screw SPK out...
  • Page 29 Location of adjusting parts Cassette mechanism section (caution) For adjusting any head, be sure to use a screw driver degaussed. Adjustment Head Cassette motor Tape speed adj. Azimuth adjustment screw Head output signal Main board Main board (BIAS FREQUENCY) T100 REC-F REC-G Tuner section...
  • Page 30 Flow of functional operation until TOC read Slider turns REST Confirm that the voltage at the pin5 of CN402 Power ON SW ON. is 'H' 'L' 'H'. Check that the voltage at the pin7(CD) of CN401 Laser ON is 1.8V. Caution.

  • Page 31: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.MB284)1-31...
  • Page 32 Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.MB284) Printed in Japan...
  • Page 33 SCHEMATIC DIAGRAMS COMPACT COMPONENT SYSTEM MX-KB2,MX-KB15 CD-ROM No.SML200408 Area suffix C ------------------------- Canada Contents Wiring diagram Block diagram Standard schematic diagrams Printed circuit boards 2-18 to 22 No.MB287SCH COPYRIGHT 2004 Victor Company of Japan, Limited. 2004/8...
  • Page 34 In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety.
  • Page 35 < M E M O >...

  • Page 36: Wiring Diagram

    Wiring diagram AC CORD P/N.: 30-00300-00L (AC 120V - 60 Hz) AUX INPUT Transformer CN803 P/N:15-01002-00 SJ500 CN504 CN201 CN202 P/N:20-61030-02 3P UL547#30 P=2 L=300 mm HP-M L-IN MUTE AGND STBY R-IN L-OUT R-OUT J602 J601 P/N:20 2 PIN CN205 FM ANT AM ANT P/N:20-61133-01...
  • Page 37 Power board Headphone board CN902 P/N:11-01002-05 P/N:11-01002-16 P/N:20-41051-37 5P UL2651#28 L=500 mm CN802 CN801 CN804 P/N:20-42110-00 11PIN P=2.5 L=250 mm CN861 Speaker board CN803 P/N:11-01002-06 CN901 CN206 CN201 HP-M MUTE STBY L-OUT R-OUT P/N:20-41020-00 2 PIN UL2651#28 P=2 L=250 mm CN205 P/N:20-51061-20 6 PIN UL1571#30 P=2 L=100 mm...

  • Page 38: Block Diagram

    Block diagram PICKUP Filament Key board section AC3.3V S501 STANDBY LED U402 TA2153 U500 SC6311 RF AMPLIFIER VFD CONTROL / DRIVER KEY SCAN SC6122 GVSW CDR-W GAIN CONTROL REMOTE RECEIVER ENCODE VOLUME DATA AND CONTROL JOG-A U401 TC9462 U403 TA20 JOG-B DIGITAL SERVO 87EP26F-4K76...
  • Page 39 TO 3CD DECK CN204 R241 U203 TA7219S BRIDGE DRIVER R242 CATH EMIT EMIT R233 U202 TA7219S BRIDGE DRIVER R232 U403 TA2092N AL SERVO DRIVER 3CD CHANGER DRIVER SECTION VDD 3.3V 05 SRAM (SDJ) AC PLUG 28k x 8 (15ns) D849-D852 +12V D806-D809 L7809CV...
  • Page 40 Standard schematic diagrams Primary / Power amp section PRE_AMP STK402-050 PROTECT CIRCUIT...
  • Page 42 Main section BOOT VREF KEY1 3835-AIN KEY2 KEY3 POW-D STEREO RDS-DAT U300 87EP26F-4K76 DUCK3 DUCK2 PLL-DAT DUCK1 PLL-CLK BUCK0 DUCK PLL-PER U101 TA8189N...
  • Page 44 Display / Key control section 00:08 MAIN KEY BOARD DISPLAY BOARD FROM MAIN PCB 2-10...
  • Page 45 ENCODER VOLUME RIGHT KEY BOARD TOP RIGHT KEY BOARD N KEY BOARD TOP LEFT KEY BOARD LEFT KEY BOARD 2-11...
  • Page 46 CD section TO MCU U401 TC9462F 2-12...
  • Page 47 TO CD DECK TO PICK UP 2-13...
  • Page 48 MP3 section RESET MIMD AD15 AD16 AD14 VDDT AD13 U404 TC94A02F TO MCU SDIO BCKIA LRCKIA VDDT AD10 2-14...
  • Page 49 2-15...

  • Page 50: Tuner Section

    Tuner section RGND FM-RF AM-IF FM-IF IC602 TA2149B F N FM-RF/O RF-VCC AM-RF FM-OSC AM-OSC DSC-OUT IF-REQ DET-OUT 2-16...
  • Page 51 AM-IF FM-IF QUAD R/OUT L/OUT 02 TA2149B F N DSC-OUT IF-REQ DET-OUT MPX-IN LPF1 LPF2 TU_R AGND TU_L +12V +5.6V DGND CD_EN PLL_DATA PLL_CLK PLL_PER NOTES: ALL OF THE VOLUME OF THE COMPONENT VOLT TESTED A T THE FM MODE. NO SIGNAL INPUT STA 2-17...

  • Page 52: Printed Circuit Boards

    Printed circuit boards Main board (forward side) 2-18...
  • Page 53 (reverse side) 2-19...
  • Page 54 Display board (forward side) (reverse side) 2-20...
  • Page 55 Tuner board (forward side) (reverse side) 2-21...
  • Page 56 Trans board (forward side) (reverse side) 2-22...
  • Page 57 < M E M O > 2-23...
  • Page 58 Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.MB287SCH)

  • Page 59: Parts List

    PARTS LIST [ MX-KB2 ] [ MX-KB1 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix UW ---------- Brazil,Mexico,Peru - Contents - 3- 2 Exploded view of general assembly and parts list (Block No.M1) 3- 6 Electrical parts list (Block No.01~04)
  • Page 60 Exploded view of general assembly and parts list Block No. Main board Main K 18 28...
  • Page 61 57 57 Display board Key board F804 F803 F801 F802 Power board...
  • Page 62 CD PLAY KNOB OW53-01001-13 TAPE A KNOB OW53-01001-14 TAPE B KNOB OW55-00005-80 LATCH (x2) OW55-00005-81 LATCH HOLDER (x2) OW55-01001-00 JVC BADGE OW60-01001-02 FRONT PANEL OW60-01001-01 TOP CABINET OW61-01001-00 HEATSINK COVER OW63-00303-80 DAMPER GEAR for CASS DOOR(x2) OW65-01001-00 SIDE PANEL L...
  • Page 63  Symbol No. Part No. Part Name Description Local OW81-01001-01 MICA SHEET OW81-01001-02 RUBBER FOOT (x2) OW84-10002-80 STRAIN RELIEF  OW98-01001-00 CD CHANGER CMS-FR3BN OW94-01002-00 CASSETTE MECHA CWM43FF44 OW91-01002-00 VFD DISPLAY OW12-21235-80 HEADPHONE JACK EJ-3511-0202B OW12-10035-12 PHONE JACK F3.5 ST-101 OW15-01002-05 POWER TRANS EI-76...

  • Page 64: Electrical Parts List

    Electrical parts list Main board  Symbol No. Part No. Part Name Description Local Block No. [0][1] C100 OW05-73561-00 C CAPACITOR 560pF  Symbol No. Part No. Part Name Description Local C101 OW05-73561-00 C CAPACITOR 560pF C102 OW05-73221-00 C CAPACITOR 220pF C104 OW05-73391-05...
  • Page 65  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local C413 OW05-73473-00 C CAPACITOR 0.047uF R124 OW07-75513-06 C RESISTOR 51 Kohm 1/16W C414 OW05-73153-00 C CAPACITOR 0.015uF R125 OW07-75513-06 C RESISTOR 51 Kohm 1/16W C415 OW05-73470-06F C CAPACITOR...
  • Page 66  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local R243 OW07-75221-06F C RESISTOR 220 ohm 1/16W R348 OW07-75103-06F C RESISTOR 10 Kohm 1/16W R244 OW07-75332-06F C RESISTOR 3.3 Kohm 1/16W R350 OW07-75103-06F C RESISTOR 10 Kohm 1/16W...
  • Page 67  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local R475 OW07-75103-06F C RESISTOR 10 Kohm 1/16W EC102 OW06-70227-20 E CAPACITOR 220uF 10V R476 OW07-75103-06F C RESISTOR 10 Kohm 1/16W EC103 OW06-75475-20 E CAPACITOR 4.7uF 50V R477...

  • Page 68: Power Board

    Power board  Symbol No. Part No. Part Name Description Local Block No. [0][2] EC438 OW06-71476-20 E CAPACITOR 47uF 16V EC439 OW06-71476-20 E CAPACITOR 47uF 16V  Symbol No. Part No. Part Name Description Local EC440 OW06-71476-20 E CAPACITOR 47uF 16V EC441 OW06-71476-20 E CAPACITOR...

  • Page 69: Display Board

     Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local R818 OW07-75153-50 C RESISTOR 15 Kohm 1/8W CN801 OW20-11020-80 CONNECTOR R819 OW07-75153-50 C RESISTOR 15 Kohm 1/8W CN802 OW20-11070-80 CONNECTOR R820 OW07-75047-10 C RESISTOR 4.7 ohm 1W CN803...

  • Page 70: Tuner Board

     Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local R530 OW07-75822-06F C RESISTOR 8.2 Kohm 1/16W Q606 9014 TRANSISTOR OW01-09014-85 R531 OW07-75153-06F C RESISTOR 15 Kohm 1/16W Q607 8550 TRANSISTOR OW01-08550-86 R532 OW07-75153-06F C RESISTOR...
  • Page 71  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local R612 OW07-75103-50 C RESISTOR 10 Kohm 1/8W XXXXX OW08-04344-88 FERRITE CORE T-25 X 15 X 10 R613 OW07-75103-50 C RESISTOR 10 Kohm 1/8W XXXXX OW11-01002-03 TUNER PCB...

  • Page 72: Packing Materials And Accessories Parts List

    Packing materials and accessories parts list Block No. 3-14...
  • Page 73 Packing and Accessories Block No. [M][3][M][M] Symbol No. Part No. Part Name Description Local  OW88-01002-05 INST BOOK LVT1251-007A ENG SPA POR OWRM-SMXKB1U REMOTE UNIT OWRM-SMXKB2U REMOTE UNIT OW29-21400-80 FM ANT OW23-04910-81 AM LOOP ANT ------------ BATTERY (x2) OW97-02755-80 AC PLUG ADAPTOR ...

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