JVC MX-K1 Service Manual

Compact component system

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Instructions manual (32 pages)

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Page 1: Table Of Contents
MX-K1 SERVICE MANUAL COMPACT COMPONENT SYSTEM MX-K1 3-CD PLAY & EXCHANGE CD-R/RW PLAYBACK RM-SMXK3A REMOTE CONTROL MX-K1 COMPACT COMPONENT SYSTEM 1 BIT DUAL D/A STANDBY/ON CONVERTER ACTIVE SLEEP BASS EX. PRESET FM /AM FM MODE STANDBY/ON SOUND STANDBY CANCEL MODE...
Page 2: Mx-K1
MX-K1 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. Services should be performed by qualified personnel only.
Page 3 MX-K1 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.
Page 4: Attention When Traverse Unit Is Decomposed
MX-K1 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 5 MX-K1 Disassembly method Commence disassembly of this 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...
Page 6 MX-K1 <Disassembly of the main blocks of this set> Replacement of the fuses and the power IC Replacing the fuses (See Fig.1) Fuse (F951) 1A 250V Prior to performing the following procedure, remove the top cover. Power trans PCB Fuse (F952) Replace the fuses inside.
Page 7 MX-K1 Removing the top cover (See Fig.4 and 5) Top cover Remove the six screws "B" that retain the top cover from the rear of the body. Remove the four screws "C" that retain the top cover from the two sides of the body.
Page 8 MX-K1 CD tray panel 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-K1 Removing the front panel assembly (See Fig.10 and 11) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Disconnect the parallel wire and card wire from the connectors CN101 and CN901 on the power amp and supply PCB.
Page 10 MX-K1 <Disassembly of units and assembly Main PCB inside this set> Removing the main PCB CN601 (See Fig.12 and 13) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Disconnect the wires from CN602 and CN603 on the main PCB, which is located on the backside of the CD changer unit.
Page 11 MX-K1 Removing the CD changer mechanism assembly (See Fig.14 to 16) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Remove the spring "d" from the front surface of the [Note] CD changer mechanism unit.
Page 12 MX-K1 Removing the CD pickup (See Fig.17) CD pickup Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Also remove the CD changer mechanism Widen the section "f ". While keeping the section "f" wide open, push the section "g"...
Page 13 MX-K1 Front panel Removing the cassette deck mechanism assembly (See Fig.21) Prior to performing the following procedure, remove the top cover. Also remove the CD changer unit. Also remove the front panel assembly. 1.Remove the five screws "O" retaining the cassette deck mechanism from the back of the front panel assembly.
Page 14 MX-K1 Removing the switch PCB and ACTIVE BASS EX. switch PCB (See Fig.23 to 26) 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.
Page 15 MX-K1 Removing the cassette deck main motor, and replacing the main belts Cassette deck mechanism (Front side) (See Fig.21, 27 and 28) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Also remove the front panel assembly.
Page 16 MX-K1 Removing the cassette deck heads Cassette deck mechanism (See Fig.21 and 30) (Front side) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. PB Head REC/PB Head Also remove the front panel assembly.
Page 17 MX-K1 Removing the power amp and supply PCB and the power trans PCB Speaker (See Fig.33 to 37) terminal Prior to performing the following procedures, remove the top cover. Rear panel Also remove the CD changer unit. Remove the two screws "X" that retain the SPEAKERS terminals.
Page 18 MX-K1 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 0dB Modulation factor : 30% to 600ohm at an oscillation frequency of 50Hz-20kHz.
Page 19: Tuner Section
MX-K1 Arrangement of adjusting positions Cassette deck mechanism (Front side) CN308 PB Head REC/PB Head (Deck-A) (Deck-B) 8-Pin L301 FM VT voltage measurement point Head azimuth screw Head azimuth screw AM VT voltage (Forward side) (Forward side) measurement point Head screw Head screw Main P.C.B.
Page 20: Flow Of Functional
MX-K1 Flow of functional operation until TOC read Check Point Slider turns REST Play Key Power ON Confirm that the voltage at the pin5 SW ON. of CN602 is "H"\"L"\"H". Automatic tuning of TE offset Check that the voltage at the...
Page 21: Maintenance Of Laser Pickup
MX-K1 Replacement of laser pickup Maintenance of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to Turn off the power switch and,disconnect the clean the lens with a alcohol soaked cotton power cord from the AC OUTLET.
Page 22: Description Of Major Ics
MX-K1 Description of major ICs 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...
Page 23 MX-K1 BA15218 (IC102) : Dual low noise operational amp. 1. Terminal layout OUT1 - IN1 OUT2 +IN1 - IN2 +IN2 BA5936S (IC621) : 6 channel BTL driver 1. Block diagram BIAS MUTE 13.3k x3/8 x3/8 13.3k LEVEL SHIFT LEVEL SHIFT LEVEL SHIFT T.S.D...
Page 24 MX-K1 LA1823 (IC1) : 1chip AM/FM, MPX tuner system 1. Block diagram GND2 VCC2 MUTE PHASE PILOT DECODER COMP ST SW TRIG S-METER BUFFER BUFFER VCC1 GND1 2. Pin function Function Function Symbol Symbol AM_RFIN AMRF signal input FM_DET FM detection signal output REG.
Page 25 MX-K1 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...
Page 26 MX-K1 TA8189N (IC401) : REC/PB amp. 1. Terminal layout 2. Block diagram CH1_A CH2_A CH1_B CH2_B CH2_B 14 REC_IN2 PREOUT1 PREOUT2 MIX_OUT A/B_SW CH2_A GND1 13 ALC EQSW REC_OUT1 REC_OUT2 REC_NF1 REC_NF2 12 GND CH1_A REC_IN1 REC_IN2 11 REC_IN1 CH1_B 3.
Page 27 MX-K1 TC74HC4094AP (IC402) : 8-bit shift and store resister 1. Terminal layout 2. Block diagram Q' S Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø...
Page 28 MX-K1 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)
Page 29 MX-K1 MN662748RPM (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...
Page 30 MX-K1 TDA7295 (IC101, IC201) : Audio amplifier 1. Terminal layout ( Top view ) VSS-OUT OUTPUT VDD-OUT N.C. N.C. MUTE STAND-BY VSS-PRE VDD-PRE BOOST N.C. IN + MUTE IN + IN - STAND-BY GND 2. Block diagram BOOTSTRAP VDD-PRE BOOST...
Page 31 MX-K1 VICTOR COMPANY OF JAPAN, LIMITED AUDIO & COMMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,maebashi-city,371-8543,Japan Printed in Japan No.20942 200105(S)
Page 32 MX-K1 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. Services should be performed by qualified personnel only.
Page 33 MX-K1 Wiring connections 3-5311-027-01-07 Switch P.C.B. Ass'y Control/FL P.C.B. Ass'y 3-5310-020-02-07 Pick up SW P.C.B. Ass'y FL TUBE FW701 FW701 Tray SW P.C.B. Ass'y W603 W606 CN701 W606 Disc count P.C.B. Ass'y CN702 CN703 FW702-2 Active bass EX. Switch P.C.B. Ass'y...
Page 34 MX-K1 MX-K1 Block diagram Head Phone POWER AMP. PCB AUX IN MAIN PCB JA301 LIN4 IC101 RIN4 Power amp. L OUT ANT-TERMINAL IN + OUTPUT J303 JA302 IC101 IC102 SP L Source Select IC201 Power amp. L OUT LIN2 R OUT...
Page 35 MX-K1 Standard schematic diagrams Head AMP, tuner and audio section To A-4 on page 2-7 TO CTRL PWB CN301 FFC-21P TO CD SCH.SECTION R370 R303 R304 SQCK SUBQ TO CD SCH.SECTION To I-6, I-7 XRST MOMU on page 2-6 STAT...
Page 36 MX-K1 MX-K1 CD servo control section R646 220K TBAL 270K R645 FBAL GCTL GCTL R673 CD MECHANISM SQCK SQCK OPTIMA - 7A C646 SUBQ SUBQ 2700p C644 C645 C641 C673 To J-6 R672 0.022 NOMT 100p 0.022 on page 2-5...
Page 37 MX-K1 FL display and CPU section Seting ECO MODE VERSION R1006 R1007 R1016 JP701 R726 C751 C752 ( 10K ) FL701 VACUUM FLUORESCENT DISPLAY CANADA ( 10K ) EUROPE 8.2K R792 0.001 8.2K 0.001 NORDIC 8.2K Q701 Q702 Q703 0.001...
Page 38 MX-K1 MX-K1 Main amp. and power supply section NO MOUNTED J104 FLAME GND VERSION J103 C391 C393 C1053 SUB.POWER INHIBIT JP101 VERSION CN981 JP901 C1054 TDA7295 C392 C394 IC101 BOARD CIRCUIT SP-L + RY901 SP-L - D101 CANADA JP102 NOMT...
Page 39 MX-K1 Power transformer section J/C Version 120V 60Hz R951 3.3M 1/2W T951 To I-3 F952 1.6A 250v on page 2-8 AC-PLUG F951 1A 250V EI-66 Parts are safety assurance parts. When replacing those parts make sure to use the specified one.
Page 40 MX-K1 MX-K1 Printed circuit boards Main circuit board (TRAY SW PCB) (TABLE POS. PCB) (PICK UP SW PCB) (DISC COUNT PCB) (TURN TABLE MOTOR PCB) (MAIN PCB) 2-10...
Page 41 MX-K1 Control/FL and Switch circuit board (CONTROL/FL PCB) (ACTIVE BASS EX. SWITCH PCB) (HEAD PHONE PCB) (SWITCH PCB) 2-11...
Page 42 MX-K1 MX-K1 Power amp. and Power supply circuit board 2-12...
Page 43 MX-K1 Power trans. circuit board 2-13...
Page 44 MX-K1 MEMO 2-14...
Page 45 MX-K1 MEMO 2-15...
Page 46 MX-K1 PARTS LIST [ MX-K1 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix J ----------------------------- U.S.A. C -------------------------- Canada - Contents - Exploded view of general assembly and parts list Cassette mechanism assembly and parts list...
Page 47 Exploded view of general assembly and parts list Block No.
Page 48: Parts List
MX-K1 (General assembly) Parts list Block No. M1MM Item Parts number Parts name Q'ty Description Area GJA2031003001C CASSETTE DOOR L GJA2032001001C CASSETTE DOOR R GJ4A05303001B0 VOLUME KNOB VOLUME GJ460170330201 JVC LOGO GJA2020061001C F.CABINET ASS'Y GJ4C05316003C0 LENS DISPLAY GJ772007940101 LABEL GJ763000320106...
Page 49 MX-K1 (General aasembly) Parts list Block No. M1MM Item Parts number Parts name Q'ty Description Area GJ703260800100 SPECIAL SCREW TT 2.6X8 D10 +B GJ702264400610 SCREW TT 4X6 +PW=8 TY GJ703300802000 SCREW TT3X8 D=12 +BW GJ702244301050 SCREW TT 3X10 +BV TYP...
Page 50: Cassette Mechanism Assembly And Parts List
MX-K1 Cassette mechanism assembly and parts list Block No. CMAT6Z216A 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 51: Cd Changer Mechanism Assembly And Parts List
MX-K1 CD changer mechanism assembly and parts list Block No.
Page 52 MX-K1 Parts list (CD mechanism) Block No. M2MM Item Parts number Parts name Q'ty Description Area GJ4A0430201A1 TRAY GJ701222260432 SCREW M2.6 X 4 GJ4D01068100A1 MOTOR PULLEY VE75984 GJ4D04300501A1 RELAY GEAR-A GJ4D04301801A1 PULLEY GEAR GJ700263260812 SCREW 2.6 X 8 GJ721271400500 METAL WASHER 2.7 X 14 X 0.5T...
Page 53 MX-K1 (CD mechanism) Parts list Block No. M2MM Item Parts number Parts name Q'ty Description Area GJ768564711 SCREW 3 X 10 GJ560430090101 E RING GJA2039002001A CHANGE PLATE GJ560430030101 C. GEAR SHAFT -------------- SWITCH PWB TURN TABLE -------------- SWITCH PWB TRAY SWITCH...
Page 54 MX-K1 (Main board) Electrical parts list Block No. 01 Item Remarks Item Remarks Parts number Parts name Area Parts number Parts name Area GJ111067121 C.CAPACITOR 47000PF F Z 50V C 108 GJ270144750310 E.CAPACITOR 25V VX M 4.7UF GJ116222821 C.CAPACITOR 50V CH J 4.7PF...
Page 55 MX-K1 (Main board) Electrical parts list Block No. 01 Item Remarks Item Parts number Parts name Remarks Area Parts number Parts name Area C 341 GJ116230621 C.CAPACITOR 16V Y M 0.01UF C 631 GJ270112270310 E.CAPACITOR 10V VX M 220UF C 342 GJ116230621 C.CAPACITOR...
Page 56 MX-K1 (Main board) Electrical parts list Block No. 01 Item Remarks Item Remarks Parts number Parts name Area Parts number Parts name Area D 324 GJ871999133 DIODE 1SS133T77 Q 315 GJ312030111210 TRANSISTOR KTC3199TPGR D 602 GJ871999133 DIODE 1SS133T77 Q 316...
Page 57 MX-K1 (Main board) Electrical parts list Block No. 01 Item Remarks Parts number Parts name Area Item Parts number Parts name Remarks Area R 101 GJ250033932199 CARBON RESISTOR 1/4WM J 39K R 341 GJ250032222199 CARBON RESISTOR 1/4WM J 2.2K R 102...
Page 58 MX-K1 (Main board) Electrical parts list Block No. 01 Item Remarks Parts number Parts name Area Item Parts number Parts name Remarks Area R 605 GJ250032212199 CARBON RESISTOR 1/4WM J 220 W 607 GJ353020120207 FLAT CABLE R 611 GJ250031032199 CARBON RESISTOR...
Page 59 MX-K1 (Control board) Electrical parts list Block No. 02 Item Remarks Item Parts number Parts name Remarks Area Parts number Parts name Area C 701 GJ264291042101 C.CAPACITOR 0.1MF FF 50V R 701 GJ250032242199 CARBON RESISTOR 1/4WM J 220K C 702 GJ270112270310 E.CAPACITOR...
Page 60 MX-K1 (Control board) Electrical parts list Block No. 02 Item Remarks Item Remarks Parts number Parts name Area Parts number Parts name Area R 772 GJ250032222199 CARBON RESISTOR 1/4WM J 2.2K R1017 GJ250036812199 CARBON RESISTOR 1/4WM J 680 R 773...
Page 61 MX-K1 Electrical parts list (Control board) Block No. 02 Item Remarks Parts number Parts name Area S1020 GJ390110181120 TACT SWITCH (ROCK) S1021 GJ390110181120 TACT SWITCH (CLASSIC) S1022 GJ390110181120 TACT SWITCH (POP) S1023 GJ390110181120 TACT SWITCH TACT SWITCH (A. S1025 GJ390110181120...
Page 62 MX-K1 (Power supply board) Electrical parts list Block No. 03 Item Remarks Item Parts number Parts name Remarks Area Parts number Parts name Area GJ190301420101 D 915 GJ310030012705 DIODE MTZJT776.8B C 115 GJ270192256399 E. CAPACITOR 50V SBP M 2.2MF D 921...
Page 63 MX-K1 (Amp board) Electrical parts list Block No. 03 Item Parts number Parts name Remarks Area R 910 GJ250032232199 CARBON RESISTOR 1/4WM J 22K R 911 GJ250033322199 CARBON RESISTOR 1/4WM J 3.3K R 912 GJ250034712199 CARBON RESISTOR 1/4WM J 470...
Page 64: Packing Materials And Accessories Parts List
MX-K1 Packing materials and accessories parts list Block No. Block No. 3-19...
Page 65 MX-K1 Parts list (Packing) Block No. M4MM Item Parts number Parts name Q'ty Description Area GJ560532000101 CARTON GJ560531300101 POLYFOAM RIGHT GJ560531200101 POLYFOAM LEFT GJ560531000101 POLY FORM BOTTOM GJ560530900101 POLY FORM GJ740082550400 POLY BAG GJ740707020300 POLYBAG GJ740362550000 POLY BAG GJ740486230300 POLY BAG...

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