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JVC CA-MXKA6 Service Manual
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JVC CA-MXKA6 Service Manual

JVC CA-MXKA6 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-KA6
SP-MXKA6
CA-MXKA6
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
SP-MXKA6
Maintenance of laser pickup -------------- 1- 21
Replacement of laser pickup -------------- 1- 21
Description of major ICs ------------------- 1- 22
Wiring connection ---------------------------- 1- 33
MX-KA6
Area Suffix
UW ............. Latin America
No. MB028
Aug. 2003

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  • Page 1: Table Of Contents

    MX-KA6 SERVICE MANUAL COMPACT COMPONENT SYSTEM MX-KA6 SP-MXKA6 CA-MXKA6 SP-MXKA6 Area Suffix UW ..... Latin America Contents Safety precautions ---------------------------- 1- 2 Maintenance of laser pickup -------------- 1- 21 Preventing static electricity ----------------- 1- 3 Replacement of laser pickup -------------- 1- 21...

  • Page 2: Safety Precautions

    MX-KA6 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-KA6 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-KA6 Important for laser products 5. CAUTION : If safety switches malfunction, the laser is 1. CLASS 1 LASER PRODUCT 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-KA6 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-KA6 <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-KA6 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-KA6 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-KA6 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-KA6 <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-KA6 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-KA6 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-KA6 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-KA6 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-KA6 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-KA6 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-KA6 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-KA6 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-KA6 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-KA6 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-KA6 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-KA6 Description of major ICs STK412-010 (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-KA6 Optical disc ICs BA5936S. (IC621) 1. Pin descriptions 2. Block diagram 1-23...
  • Page 24 MX-KA6 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-KA6 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-KA6 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-KA6 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 16 GND Ground O APC Amp. output terminal Power supply terminal 17 VREF O VREF output terminal RF adder Amp.
  • Page 28 MX-KA6 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-KA6 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-KA6 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-KA6 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-KA6 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-KA6 Wiring connection 1-33...
  • Page 34 MX-KA6 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan No.MB028 Printed in Japan 200308...

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