JVC MX-KA7 Series Service Manual
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JVC MX-KA7 Series Service Manual

JVC MX-KA7 Series Service Manual

Compact component system
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SERVICE MANUAL
COMPACT COMPONENT SYSTEM
Contents
Safety precautions ---------------------------- 1- 2
Preventing static electricity ----------------- 1- 3
Important for laser products ---------------- 1- 4
Disassembly method ------------------------ 1- 5
Adjustment method -------------------------- 1- 18
operation until TOC read -------------- 1- 20
MX-KA7
SP-MXKA7
CA-MXKA7
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
SP-MXKA7
Maintenance of laser pickup -------------- 1- 21
Replacement of laser pickup -------------- 1- 21
Description of major ICs ------------------- 1- 22
Wiring connection ---------------------------- 1- 33
MX-KA7
Area Suffix
JW ........ Mexico, Panama
No. MB039
2003/11

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  • Page 1: Table Of Contents

    MX-KA7 SERVICE MANUAL COMPACT COMPONENT SYSTEM MX-KA7 SP-MXKA7 CA-MXKA7 SP-MXKA7 Area Suffix JW ..Mexico, Panama Contents Safety precautions ---------------------------- 1- 2 Maintenance of laser pickup -------------- 1- 21 Preventing static electricity ----------------- 1- 3 Replacement of laser pickup -------------- 1- 21 Important for laser products ---------------- 1- 4 Description of major ICs ------------------- 1- 22 Disassembly method ------------------------ 1- 5...

  • Page 2: Safety Precautions

    MX-KA7 Safety Precautions 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits.

  • Page 3: Preventing Static Electricity

    MX-KA7 Preventing static electricity 1. Grounding to prevent damage by 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.

  • Page 4: Important For Laser Products

    MX-KA7 Important for laser products 1. CLASS 1 LASER PRODUCT 5. CAUTION : If safety switches malfunction, the laser is able to function. 2. DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam. 6.

  • Page 5: Disassembly Method

    MX-KA7 Disassembly method Commence disassembly of the set by removing the main units and then proceed to the components and assemblies inside the units. Replacement of the fuses and the power IC Top cover CD changer unit Front panel assembly Chassis unit CD changer unit Removing the main PCB...
  • Page 6 MX-KA7 <Disassembly of the main blocks of the set> Replacement of the fuses and the power IC Replacing the fuses (See Fig.1) Replacing the heat sink cover (See Fig.3) Prior to performing the following procedure, remove 1. Remove four screws B from the rear panel. the top cover.
  • Page 7 MX-KA7 Removing the top cover (See Fig.4 and 5) 1. Remove six screws C that retain the top cover from the panel rear of the body. 2. Remove six screws D that retain the top cover from the two sides of the body. 3.
  • Page 8 MX-KA7 Removing the CD changer unit (See Fig.6 to 9) Prior to performing the following procedures, remove the top cover. [Caution] Although the CD mechanism unit can be removed without removing the CD tray panel, it is still recommended to remove it in order to prevent damage.
  • Page 9 MX-KA7 Removing the front panel assembly (See Fig.10 to 11) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. 1. Disconnect the parallel wire and the cord wire from the connectors CN701, CN101 on the power amp. PCB.
  • Page 10 MX-KA7 <Disassembly of units and assembly inside this set> CD PCB Removing the CD PCB (See Fig.12 to 13) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. 1. Disconnect the wires from CN603A, CN603B and CN604 on the CD PCB, which is located on the back side of the CD changer unit.
  • Page 11 MX-KA7 Removing the CD changer mechanism CD changer assembly (See Fig.14 to 15) unit Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. 1. Turn the CD changer mechanism cover base and remove the screws d connecting the unit to the CD changer mechanism assembly.
  • Page 12 MX-KA7 Removing the CD pickup (See Fig.16) CD pickup Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Also remove the CD changer mechanism. 1. Widen the section f. 2. While keeping the section f wide open, push the section g in the direction of the arrow to remove the shaft, and then remove the CD pickup.
  • Page 13 MX-KA7 Removing the cassette deck mechanism (See Fig.19) Front panel Prior to performing the following procedures, remove assembly the top cover. Also remove the CD changer unit. Also remove the front panel assembly. 1. Remove six screws Z retaining the cassette deck mechanism.
  • Page 14 MX-KA7 Removing the switch PCB and sound mode and CD function switch PCB (See Fig.20 to 23) Front panel assembly Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Also remove the front panel assembly. 1.
  • Page 15 MX-KA7 Removing the cassette deck main motor, Cassette deck mechanism and replacing the main belts (Front side) (See Fig.19, 24 and 25) Prior to performing the following procedures, remove the top cover and both sides board. Also remove the CD changer unit. Also remove the front panel assembly.
  • Page 16 MX-KA7 Removing the cassette deck heads Cassette deck mechanism (See Fig. 19 and 27) (Front side) Prior to performing the following procedures, remove the top cover and both sides board. Also remove the CD changer unit. Also remove the front panel assembly. 1.
  • Page 17 MX-KA7 Removing the power amp and supply PCB and the power trans PCB (See Fig. 2, 29 to 31) Prior to performing the following procedures, remove the top cover and CD changer unit. 1. Remove four screws B from the rear panel. (Fig.3) 2.

  • Page 18: Adjustment Method

    MX-KA7 Adjustment method Measurement instruments required for adjustment Radio input signal 1. Low frequency oscillator. AM modulation frequency : 400Hz This oscillator should have a capacity to output Modulation factor : 30% 0dB to 600ohm at an oscillation frequency of FM modulation frequency : 1kHz 50Hz-20kHz.
  • Page 19 MX-KA7 Arrangement of adjusting positions Cassette deck mechanism (Front side) PB Head REC/PB Head (Deck-A) (Deck-B) Head azimuth screw Head azimuth screw (Forward side) (Forward side) Head azimuth screw Head azimuth screw (Reverse side) (Reverse side) Tape recorder section Adjusting Measurement Standard Items...

  • Page 20: Flow Of Functional Operation Until Toc Read

    MX-KA7 Flow of functional operation until TOC read Check Point Slider turns REST Confirm that the voltage at the pin5 Play Key Power ON SW ON. of CN602 is "H"\"L"\"H". Automatic tuning of TE offset Check that the voltage at the Laser ON pin40 of IC601 is + 5V? Detection of disc...

  • Page 21: Maintenance Of Laser Pickup

    MX-KA7 Maintenance of laser pickup Replacement of laser pickup (1) Cleaning the pick up lens Turn off the power switch and,disconnect the Before you replace the pick up, please try to clean power cord from the AC OUTLET. the lens with a alcohol soaked cotton swab. (2) Life of the laser diode When the life of the laser diode has expired, the following symptoms will appear.

  • Page 22: Description Of Major Ics

    MX-KA7 Description of major ICs STK412-030 (IC301) : Dual low noise operational 1. Block Diagram TR41 Comparator TR12 TR11 TR16 TR19 TR14 TR13 TR18 TR10 TR20 TR15 TR17 Comparator TR51 1110 2. Test Circuit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 100pF...
  • Page 23 MX-KA7 Optical disc ICs BA5936S. (IC621) 1. Pin descriptions 2. Block diagram 1-23...
  • Page 24 MX-KA7 Optical disc ICs HA12237F (IC401) 1. Block Diagram Pin Description, Equivalent Circuit (cont) = 12V, Ta = 25°C, No Signal, The value in the table shows typical value.) Pin No. Pin Name Note Equivalent Circuit Description V = V Ripple filter PB-EQ(L) NAB output...
  • Page 25 MX-KA7 Pin Description, Equivalent Circuit = 12V, Ta = 25°C, No Signal, The value in the table shows typical value.) Pin No. Pin Name Note Equivalent Circuit Description V = V RECOUT(L) V = V REC output RECOUT(R) PBOUT(L) PB output PBOUT(R) EQOUT(L) V = 2.9 V...
  • Page 26 MX-KA7 Pin Description, Equivalent Circuit (cont) = 12V, Ta = 25°C, No Signal, The value in the table shows typical value.) Pin No. Pin Name Note Equivalent Circuit Description ALC ON/OFF (Control Mode control input voltage = 3 V) High/Norm A/ B 22 k M UTE ON/OFF...
  • Page 27 MX-KA7 AN22000A (IC611) : CD-DA Head Amp. 1. Terminal layout 2. Pin function Function Function Symbol I/O Symbol I/O APC Amp. input terminal 15 NRFDET O NRFDET output terminal O APC Amp. output terminal 16 GND Ground Power supply terminal 17 VREF O VREF output terminal RF adder Amp.
  • Page 28 MX-KA7 MN6627482WA (IC601) : Digital servo & digital signal processor 1. Terminal layout 80~61 21~40 2. Pin function Symbol Function Symbol Function 1 BCLK Not use 41 PLLF2 Not use 2 LRCK Not use 42 TOFS Not use 3 SRDATA Not use 43 WVEL Not use...
  • Page 29 MX-KA7 BA15218DIP (IC102) : Dual low noise operational amp. 1. Terminal layout OUT1 - IN1 OUT2 +IN1 - IN2 +IN2 LA1823DIP (IC1) : 1chip AM/FM, MPX tuner system 1. Block diagram GND2 VCC2 MUTE PHASE PILOT DECODER COMP ST SW TRIG S-METER BUFFER...
  • Page 30 MX-KA7 TDA7440D (IC101) : Audio processor 1. Terminal layout RIN3 RIN4 RIN2 LOUT RIN1 ROUT LIN1 AGND LIN2 LIN3 CREF LIN4 MUXO-L IN(L) DGND MUXO-R TRE(R) IN(R) TRE(L) BIN(R) N.C. BOUT(R) N.C. BIN(L) BOUT(L) 2. Block diagram MUXO-L IN(L) TRE(L) BIN(L) BOUT(L) LIN1...
  • Page 31 MX-KA7 TC74HC4094AP (IC402) : 8-bit shift and store resister 1. Terminal layout 2. Block diagram Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø ØS ØS LATCH LATCH...
  • Page 32 MX-KA7 LC72136N (IC2) : PLL Frequency synthesizer 1.Terminal layout LPFI LPFO CLOCK VCOSTOP FMIN AM/FM AMIN IFCNT SDIN IFIN 2. Block diagram Phase Reference Detector Driver Charge Pump Swallow Counter Swallow Counter 1/16,1/17 4bit 1/16,1/17 4bit Unlock Detector 12bit Programmable DriverS Universal Data Shift Register &...

  • Page 33: Wiring Connection

    MX-KA7 Wiring connection 1-33...
  • Page 34 MX-KA7 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.MB039...
  • Page 35 MX-KA7 n Tuner section...
  • Page 36 MX-KA7 n Main section...
  • Page 37 MX-KA7 n CD section...
  • Page 38 MX-KA7 n Amplifier...
  • Page 39 MX-KA7 n FL Display and CPU Control...
  • Page 40 MX-KA7 n Power transformer section...
  • Page 41 MX-KA7 n Block diagram...
  • Page 42 MX-KA7 n Wiring diagram...
  • Page 43 MX-KA7 n Main top PWB...
  • Page 44 MX-KA7 n Main bottom PWB 2-10...
  • Page 45 MX-KA7 n FL Display and CPU (TOP) 2-11...
  • Page 46 MX-KA7 n FL Display and CPU (BOTTOM) 2-12...
  • Page 47 MX-KA7 n Power Amp. PWB 2-13...
  • Page 48 MX-KA7 n Power trans PWB 2-14...
  • Page 49 PARTS LIST [ MX-KA7] * All printed circuit boards and its assemblies are not available as service parts. Area suffix JW -------------- Mexico,Panama - Contents - 3- 2 Exploded view of general assembly and parts list (Block No.M1) 3- 5 CD changer mechanism assembly and parts list (Block No.MA) 3- 7 Cassette mechanism assemb ly and parts list (Block No.MP)
  • Page 50 Exploded view of general assmbly and parts list Block No. Main board VFD board Vol board Front Headphone board board board Powe...
  • Page 51 Block No. board VFD board Front Headphone board board board Power board...
  • Page 52 General assembly Block No. [M][1][M][M]  Symbol No. Part No. Part Name Description Local ------------ CD CHANGER MACH BI109835010201 BADGE JVC BI300856010101 BELT CLIP WASHE  4 BI301789010101 BUSHING 5RF-5B BI107475030101 CAP CD3 BI107475020101 CAP CD2 BI107475010101 CAP CD1 BI107475040101...
  • Page 53 CD changer mechanism assembly and parts list Block No. BI3400931...
  • Page 54 CD changer mechanism Block No. [M][A][M][M]  Symbol No. Part No. Part Name Description Local BIAJ7200601J BASE-MAIN BIAJ6100601P BRKT-CHUCK BI3302000158 MAGNET-FERRITE BIAJ7200601L TABLE-CHUCK BIAJ6300601A SHEET-CHUCK (x3) BIAJ7300601B BELT-LOAD BIAJ6600601N GEAR-SYNCRO BIAJ6600601L GEAR-CONVERT BIAJ6600601M GEAR-TRAY BIAJ6600601R GEAR-CAM BIAJ6600601K GEAR-LOAD BIAJ6600601J GEAR-PULLEY BIAJ7200601N SLIDER-CAM BI3405000101...
  • Page 55 Cassette mechanism assembly and parts list Block No. CMAT6Z219A L SIDE TYPE L SIDE R SIDE R SIDE TYPE Note: Parts listed on the Parts List below can be supplied. However, parts that are not listed below cannot be supplied individually but only by purchasing the whole Cassette Mechanism Assembly Unit.
  • Page 56 Electrical parts list AMP. board Wiring diagram Block No. [0][1][0][0] Block No. [0][2][0][0]  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local  C901 BICM682101KP015 M CAPACITOR CN305 BI1205441U FF-CABLE  C902 BICM682101KP015 M CAPACITOR CN306...
  • Page 57  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local S1010 BI8EVQ21405P015 TACT SWITCH 1SS133 DIODE S1011 BI8EVQ21405P015 TACT SWITCH LA1823 S1012 BI8EVQ21405P015 TACT SWITCH IC101 TDA7440D S1013 BI8EVQ21405P015 TACT SWITCH IC102 BA15218F S1014 BI8EVQ21405P015...
  • Page 58 Transformer board Block No. [0][5][0][0]  Symbol No. Part No. Part Name Description Local  C951 BICT224275M M.CAPACITOR  F951A BI201196010101 FUSE HOLDER  F951B BI201196010101 FUSE HOLDER  F952A BI201196010101 FUSE HOLDER  F952B BI201196010101 FUSE HOLDER FW951 BI12P90055U CONNECTOR.ASSY BI251223G01V TRANS PWB...
  • Page 59 <MEMO> 3-11...
  • Page 60 Packing materials and accessories parts list Block No. FRONT 3-12...
  • Page 61 Packing and accessories Block No. [M][3][M][M]  Symbol No. Part No. Part Name Description Local BI600MXKA6380 REMOTE CONTROL ------------ BATTERY (x2) BIAN01031 AM LOOP ANT BIAN01012 ANT WIRE BI4412201U INSTRUCTIONS LVT1075-001A MXKA7JW-SPBOX-L SPEAKER BOX L MXKA7JW-SPBOX-R SPEAKER BOX R BI4313451U CARTON BOX BI4512251 POLY FORM...
  • Page 62 MB-MCI-00057 (1/6) SUBJECT : Date : 14. Addition of part Feb. 2005 The following parts have been changed. Please note these new parts in your service manual. We suggest that you order the parts concerned as apares. Parts identified by the symbol are critical for safety.
  • Page 63 MB-MCI-00057 (2/6) Main board Main board Item Parts number Parts name Remarks Item Parts number Parts name Remarks R513 BIRC0000165A005 1/16W Q302 BI2KTC3200P0008 Transistor KTC3200 GR D314 BI31SS133M0007 Diode 1SS133 R309 BIRC1000165A005 1/16W 10 OHM C923 BICC22350Z POLYFILM CAP. 0.022UF R311 BIRC1000165A005 1/16W 10 OHM...
  • Page 64 MB-MCI-00057 (3/6) Main board Main board Item Parts number Parts name Remarks Item Parts number Parts name Remarks BIRC3320085M000 1/8W RESISTOR 3.3 K R205 BIRC1540165A005 1/16W 150K BIRC3320085M000 1/8W RESISTOR 3.3 K R424 BIRC1820165A005 1/16W 1.8K BIRC3320085M000 1/8W RESISTOR 3.3 K R349 BIRC2210165A005 1/16W 220 OHM...
  • Page 65 MB-MCI-00057 (4/6) Main board Main board Item Parts number Parts name Remarks Item Parts number Parts name Remarks BICH102500KM019 AXIAL CER. CAP. 0.001UF R664 BIRC2210165A005 1/16W BICH103160NM024 AXIAL CER. CAP. 0.01UF R663 BIRC2220165A005 1/16W 2.2K BICH103160NM024 AXIAL CER. CAP. 0.01UF R626 BIRC2240165A005 1/16W 220K...
  • Page 66 MB-MCI-00057 (5/6) Front board Front board Item Parts number Parts name Remarks Item Parts number Parts name Remarks R770 BIRC2220085N000 1/8W RESISTOR 2K2 R775 BIRC1020165A005 1/16W R752 BIRC4720165A005 1/16W 4.7K C711 BICC220500JA041 CHIP CER.CAP. R1046 BIRC4720165A005 1/16W 4.7K C712 BICC220500JA041 CHIP CER.CAP. R791 BIRC4720165A005 1/16W 4.7K...
  • Page 67 MB-MCI-00057 (6/6) AMP.board Front board Item Parts number Parts name Remarks Item Parts number Parts name Remarks BIRC3330085M000 Resistor R395 33K OHM C702 BICE107100MP015 ELECT. CAP. 100UF/10V BICE105500MP015 Elect Cap. C352 1UF/50V C704 BICE108100MP015 ELECT. CAP. 1000UF/10V BICE477160MP015 Elect Cap. C919 470UF/16V R759...

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