JVC CA-MXK50 Service Manual Download Page 6

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MX-K50

1-6

Prior to performing the following procedure, remove
the metal cover and CD changer unit.

Disconnect the card wire from the connector FCW3
on the main board.

Disconnect the harness from the connector ECW1,
JCW1, JCW2 and HCW3 on the main board.

Remove the screw E attaching the earth terminal
extending from the cassette mechanism assembly.

Remove the two screws F attaching the front panel
assembly to both sides of the body.

Remove the screw G attaching the main board to the
front panel assembly.

Remove the screw H attaching the front panel
assembly to bottom of the body.

Release the two joints1 and two joints2, and detach
the front panel assembly toward the front.

Removing the front panel assembly

(See Fig.8 to 10)

Fig.6

Fig.7

Fig.5

RCW6

CD board

CD changer unit

Main board

CW105

Rear panel

(both sides)

Rear panel

CD changer unit

Front panel

assembly

Fig.8

Fig.9

Main board

Amp. board

FCW3

JCW2

JCW1

ECW1

HCW3

ACW1

ACW2

Front panel

assembly

Joint1
(both sides)

(both sides)

Joint1
(both sides)

(both sides)

(fixing the earth wire)

Front panel
assembly

Main board

Summary of Contents for CA-MXK50

Page 1: ...19 1 23 1 24 1 24 1 25 1 28 43 Area suffix UW Brazil Mexico Peru U Other Areas SP MXK50 SP MXK50 CA MXK50 DISC CHANGE C O M P U P L A Y C O N T R O L STANDBY ON STANDBY CD R RW P LAYBACK TUNING CLOCK TIMER DISPLAY PHONES REPEAT REC START S TOP CD REC START DUBBING PROGRAM RANDOM TAPE B TAPE A TAPE CD FM AM ACTIVE BASS EX LEVEL SOUND MODE MX K50 C D 2 C D 3 ACTIVE BASS EXT ENSION CD 3 FULL LOGIC CO...

Page 2: ...uct antenna terminals knobs metal cabinet screw heads headphone jack control shafts etc to be sure the product is safe to operate without danger of electrical shock Do not use a line isolation transformer during this check Plug the AC line cord directly into the AC outlet Using a Leakage Current Tester measure the leakage current from each exposed metal parts of the cabinet particularly any expose...

Page 3: ...The tester s internal power source can easily destroy the laser diode 4 Handling the traverse unit optical pickup 1 Do not subject the traverse unit optical pickup to strong shocks as it is a sensitive complex unit 2 Cut off the shorted part of the flexible cable using nippers etc after replacing the optical pickup For specific details refer to the replacement procedure in the text Remove the anti...

Page 4: ...tion and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated It is dangerous to defeat the safety switches 5 CAUTION If safety switches malfunction the laser is able to function 6 CAUTION Use of controls adjustments or performance of procedures other than those specified herein may result in hazardous r...

Page 5: ...D tray After drawing the lower part of the tray fitting toward the front remove the five claws Then while moving the tray fitting upward remove it 1 Prior to performing the following procedure remove the metal cover and CD tray fitting Remove the card wire attached to CD changer unit on the adhesion tape Disconnect the card wire from the connector CW105 on the CD board Disconnect the harness from ...

Page 6: ...screw G attaching the main board to the front panel assembly Remove the screw H attaching the front panel assembly to bottom of the body Release the two joints1 and two joints2 and detach the front panel assembly toward the front 1 2 3 4 5 6 7 Removing the front panel assembly See Fig 8 to 10 Fig 6 Fig 7 Fig 5 RCW6 CD board CD changer unit Main board CW105 Rear panel C D both sides Rear panel CD c...

Page 7: ...1 2 3 4 Removing the heat sink amp board See Fig 8 11 and 12 Prior to performing the following procedure remove the metal cover Disconnect the card wire from the connector CON01 on the tuner board Remove the two screws L attaching the tuner board to the rear panel 1 2 Removing the tuner board See Fig 12 and 13 Prior to performing the following procedure remove the metal cover CD changer unit heat ...

Page 8: ... the power cord See Fig 14 Prior to performing the following procedure remove the metal cover CD changer unit and rear panel Disconnect the power cord from the connector RCW2 on the trans board and pull up the power cord stopper upward 1 Prior to performing the following procedure remove the metal cover CD changer unit and heat sink amp board Remove the screw N attaching the trans board to the rea...

Page 9: ...oard releasing the two tabs1 Remove the mic board releasing the two tabs2 Disconnect the card wire from the connector UCW7 on the front key board if needed 1 2 3 4 5 Removing the front key board with mic board See Fig 2 and 3 Front panel assembly Prior to performing the following procedure remove the front board You can pull out the headphone jack board 1 Removing the headphone jack board See Fig ...

Page 10: ... as shown fig 3 then mount the CD tray When assembling the CD tray take extreme care not engage with gear synchro 1 2 Prior to performing the following procedure remove the CD changer unit Removing the CD tray See Fig 1 and 2 Reinstall the CD tray See Fig 3 and 4 CD changer unit Fig 2 Fig 1 Fig 3 Fig 4 Loading pulley gear CD changer uint reverse side CD board CD tray CW103 CD tray Gear convert Gea...

Page 11: ... 5 Prior to performing the following procedure remove the CD tray and sensor board Remove the screw B attaching the turn tray Detach the turn tray from the base tray Pull outward the tab b attaching the turn tray motor on the base tray and detach the turn tray motor 1 2 Removing the turn tray motor See Fig 6 and 7 Introductory notes Base tray Turn tray CD tray Fig 7 Fig 6 Tab a Tab b Sensor board ...

Page 12: ...harness from connector on the CD board Remove the screw C attaching the switch board and release the two tabs e attaching the switch board outward and detach the switch board Remove the two screws D attaching the CD board First release the two tabs f and two tabs g attaching the motor then release the CD board If the tabs f and g are hard to release it is recommendable to unsolder the two soldered...

Page 13: ...CD mechanism holder assembly Pull outward the stopper fixing the shaft on the left side and remove the CD mechanism holder assembly from behind in the direction of the arrow y Turn the CD mechanism holder assembly half around the lift up slide shaft h of the CD mechanism holder assembly until the turn table is reversed and pull out the CD mechanism holder assembly 1 2 3 Removing the CD mechanism h...

Page 14: ...ing the pickup unit Removing the feed motor See Fig 1 Remove the two motor fixing screws at B and removing the feed motor Removing the spindle motor Removing the motor board See Fig 2 1 Unsolder the motor terminal on the motor board 2 Remove the moter board The spindle motor cannot be removed as a single unit When removing the spindle motor change the chasis and turntable together as aunit Fig 2 F...

Page 15: ...ase head Remove the screw C fixing the erase head Fig 1 Removing the pinch roller 1 Pull out the pinch roller by opening the pinch roller stopper outward to unlock Fig 3 2 When reassembling the pinch roller refer to fig 4 to hook up the spring Fig 1 Fig 2 Fig 3 Fig 4 R P Head R P Head E Head Spring Stoppsr Pinch roller assembly A A B B C Pinch roller Pinch roller stopper Pinch roller Pinch roller ...

Page 16: ...board Fig 5 3 Unhook the three parts b from the board Fig 5 4 Remove the mechanism board Fig 5 Removing the flywheel Remove the cut washers at c and d from the capstan shaft then remove the flywheel When reassembling the flywheel be sure to use new washers as they cannot be reused Fig 8 Fig 9 Fig 5 Drive belt Drive belt Drive belt Flat D D E E a b b a Motor Motor terminal Motor c d FR belt FR belt...

Page 17: ...rd from the speaker terminal Remove the two screws A attaching the tweeter on the front panel inner side Notes Squawker cannot be removed 1 2 Removing the tweeter See Fig 2 Prior to performing the following procedure remove the front panel Remove the four screws B attaching the woofer and remove the woofer Remove the cord from the speaker terminal Remove the capacitor pasted up on the woofer 1 2 3...

Page 18: ...1 CW104 CW102 CW103 CW106 CW105 CW2 CW1 CW3 AAN1 CD mechanism Power transformer RFS5 RFS6 RFS7 RFS8 PCW1 ACW1 ACW2 Front board 3809 001184 3809 001222 3809 001228 AH39 20002D AH39 00022A AH39 00247A AH39 20025S 3809 001185 AH39 00245A 3809 001224 3809 001315 AH39 20561P 3809 001121 AH38 12001A 3809 001034 Amp board CD switch board Front key board Tuner board Main board Headphone J board Color code...

Page 19: ...ltage Adjustment method 1 Tuner Adjustment Location of Tuner PCB AM MW OSC Adjustment Output Received FREQ Adjustment point 9kHz step 531 1602kHz 10kHz step 530 1710kHz MO AM MW RF Adjustment ITEAM 594 KHz 600 KHz MA Maximum Output Fig 1 1 7 0V 0 5V ...

Page 20: ...evel to 28dB Fig 2 IF CENTER and THD Adjustment SSG FREQ Adjustment point SVR1 98 MHz BEACON SENSITIVITY SEMI VR 20K FM S S G GND 28 dB FM S S G Output GND Speaker Terminal FM Antenna Terminal Distortion Meter Input SET Input output Oscilloscope FM IN FM Antenna SET 20 k OUTPUT AM SSG 450KHZ INPUT AM ANT IN Speaker Terminal 60cm AM IF VTVM Oscilloscope AM MW I F Adjustment Maximum output Fig 4 SSG...

Page 21: ...OUT VTVM is connected to the scope To adjust plabyback level REC 1 Adjust Deck 1 Play Level To Adjust Remark Standard Pre Setup Item Step Pre Setup Condition To Adjust 1 Deck 1 VT 712 2 Press PLAY SW button 3 Deck 2 Same as above OUT connected to the frequencycounter NOR SPEED Control Turn VSR1 to left and right FRONT PCB 1 Measuring tape i VT 712 MTT 111 or equivalent Tapes recorded with 3kHz ii ...

Page 22: ...em Step Pre Setup Condition To Adjust SPK OUT VTVM is connected to the scope After putting VT 703 into Deck 2 1 Press FWD PLAY button Turn the control screw to as shown in Fig 3 Max output and same phase both channels After adjustment secure it with REGION LOCK Recording Bias Voltage After putting AC 225 into Deck 2 1 Press REC PLAY button 2 MAIN PCB JCW3 connectted to VTVM Turn JSR2L JSR2R to the...

Page 23: ...rox 3 7sec Pin 34 of KB9226 IC101 Approx 0 4V 2 50V Tracking error waveform at TOC reading Power ON Play Key Confirm that the voltage at the pin37 of KB9226 IC101 is 3 5V Confirm that the signal from pin24 of KB9226 IC101 is 3 5V as a accelerated pulse during approx 1 96s Confirm the waveform of the Tracking error signal at the pin 34 of KB9226 IC101 TOC reading Play a disc Confirm the eye pattern...

Page 24: ...When the life of the laser diode has expired the following symptoms will appear 1 The level of RF output EFM output amplitude of eye pattern will below 1 Cleaning the pick up lens Before you replace the pick up please try to clean the lens with a alcohol soaked cotton swab The semi fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power Sin...

Page 25: ...1 25 MX K50 Troubleshooting 1 Amplifier Power malfunction No output 5 6 7 5 6 7 ...

Page 26: ...MX K50 1 26 2 Tuner malfunction FM AM HA12235F HA12235F 16 3 4 27 28 JIC1 HA12235F PIN5 26 JC63L JC63R JR65L JR65R 3 Tape ...

Page 27: ...1 27 MX K50 4 CD ...

Page 28: ... VHALF VREF 1 bit DAC Digital Out Digital Filter C2PO DATX SADTI LRCKI BCKI S5L9290X DSP DAC 48 LQFP 0707 VSSA_PLL VCO1LF VSSD_PLL VDDD_PLL XIN XOUT EFMI LOCK SMEF C2PO JITB DATX VDDD3 5V VDDD2 3V SBCK SQDT SMON TESTV SMDS WDCK MUTE BCKI 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 VDDD1_5V VSSD1_5V LKFS LKFS...

Page 29: ...put The Lock status output of frame sync 4 2336MHz clock output System Reset at L Latch signal input from Micom Serial data input from Micom Serial data receiving clock input from Micom The internal status output to Micom Subcode sync signal S0 S1 output Subcode Q data transfering bit clock input Subcode Q data serial output System mute at H Digital Power 3V Power Internal Logic Digital Ground Int...

Page 30: ...C Gen EQO PD LD LPFT TEIO TZC SSTOP ATSC TEO TEM SLP SLO SLM FEO FEM SPDLO SPDLM EQI RFO RFM EQC VREF PDE PDF PDBD PDAC ISTAT MCK MDATA MLT RESET WDCK CLVI LOCK ASY EFM 5 45 46 44 43 6 7 8 9 10 11 14 13 15 16 17 19 18 20 22 21 24 23 30 29 25 26 27 28 29 36 33 34 35 37 38 39 41 40 42 47 48 1 2 3 EFMI DCCI DCC0 MCP DCB VCC VDD FRSH FSET FLB FGD FSI TGU S1L9226X TEO TEM SLP SLO SLM ISTAT MCK MDATA ML...

Page 31: ...nverting input Spindle amp output Sled servo inverting input Sled servo output Sled servo noninverting input Tracking servo amp inverting input Tracking servo amp output Focus servo amp inverting input Focus servo amp output pin Main ground Tracking zero crossing input Check the position of pick up wherther inside or not Tracking error output Tracking servo input Tracking error integration input t...

Page 32: ...y two prescaler and then supplied to the swallow counter A1 though the range of divisor setting is from 272 to 65 535 the actual divisor is twice the setting since there is also a built in divide by two prescaler XIN XOUT 20 Crystal resonator connection 4 5MHz 7 2MHz Serial data input AMIN is selected when DVS is set to 0 Serial data input When SNS is set to 1 The input frequency range is form 2 t...

Page 33: ... 18 16 IFIN AIN AOUT Pins used for both input and output The input or output state is determined by bits IOC1 and IOC2 in the serial state Data 0 Input port 1 Output port When specified for use as an input port The input state is transmitted to the controller through the DO pin Input state Low data value 0 High data value 1 When specified for use as an output port The output state is determined by...

Page 34: ...0 S19 PC3 S18 PC2 S17 PC1 S16 PC0 VDD3 S15 T15 S14 T14 S13 T13 S12 T12 S11 T11 S10 T10 S9 T9 S8 T8 S7 T7 S6 T6 S5 T5 S4 T4 S3 T3 S2 T2 S1 T1 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ...

Page 35: ...wer pin 4 bit input port Input output in bit unit INT1 input HOLD release input INT2 input timer 0 event input Output for VFD display controller segment timing incommon Output for VFD dis lay controller segment timing withinternal pull down resistor in common Internal pull down resistor output Power pin Output for VFD display controller High voltage input port PC0 to PC3 Power pin for the VFD outp...

Page 36: ...EQOUT R TAI R PBOUT R NC RECIN R NC RECOUT R ALC ON OFF High Norm A B MUTE ON OFF Function PB EQ feed back NAB output EQ output Tape input PB output NC pin REC EQ input NC pin REC output Mode control input Mode control input Mode control input Mode control input Pin No 15 16 17 18 19 20 21 22 23 24 25 26 Symbol REC MUTE OFF ON Vcc GND IREF Test mode RECOUT L NC RECIN L NC PBOUT L Function Mode con...

Page 37: ...D12 D13 D14 D15 D16 1 2 3 4 5 6 7 8 9 10 16 32 31 30 CLOCK INPUT CLK SET INPUT S CHIP SELECT CS INPUT SERIAL DATA DI INPUT GND GND Vcc DO SERIAL DATA OUTPUT PARALLEL DATA I O D1 D2 D3 D22 D23 D24 Control circuit Shift register 1 DO D24 D23 D22 D3 D2 D1 Q24 Q23 Q22 Q3 Q2 Q1 D24 D23 D22 D3 D2 D1 Q24 Q23 Q22 Q3 Q2 Q1 DI Parallel output latch Shift register 2 STK402 120 AIC2 Power amp 1 Pin layout 1 2...

Page 38: ...0nF 5 6K BIN R BOUT R 79dB CONTROL 79dB CONTROL 15 13 19 18 50K 0 47 F 50K 0 47 F 50K 0 47 F 50K 0 47 F 50K 0 47 F 50K 0 47 F 50K 31 5dB control R IN3 R IN2 R IN1 31 5dB control L IN2 L IN3 L IN4 5 6 7 3 2 1 Vref OFF SURR OFF SURR RB FIX FIX VAR RB FIX VAR L R 30K 30K 9 8 2 2 F 11 10 2 2 F MUXOUT R IN R MUXOUT L IN L L_IN3 L_IN4 MUXOUTL IN L MUXOUT R BIN R IN R BOUT R BIN L 1 3 2 4 5 6 7 8 9 BOUT ...

Page 39: ...UT 12V a VS OUT 8 6V EN 8 6V EN 12V a GND EN 12V b N C OUT 5 6V VS OUT 12V b TAB CONNECTED TO PIN 6 D97AU716A Pin Pins Description 1 OUT 12V b 12V 1 3A SWITCHED OUTPUT VOLTAGE 2 VS Supply Voltage 3 OUT 5 6V 5 6V 250mA OUTPUT VOLTAGE 4 N C not connected 5 EN 12V b Enable 12V 1 3A SWITCHED OUTPUT VOLTAGE 6 GND Ground 7 EN 12V a Enable 12V 0 8A SWITCHED OUTPUT VOLTAGE 8 EN 8 6V Enable 8 6V 0 6A SWITC...

Page 40: ...otor driver 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 GND GND 10K REGULATOR 10K 10K VCC VCC 10K 10K T S D 10K 10K 10K 50K MUTE LEVEL SHIFT LEVEL SHIFT LA1837 IC01 FM IF DET AM RF IF DET 1 Block diagram 1 Block diagram ...

Page 41: ...ntrol with external DC voltage Echo mute control and clock stop control with external DC voltage Controls a built in clock generation circuit with external R To connect 1 2 Vcc output and filter capacitor Uses external C to from an D A conversion integrator Uses external C to from an D A conversion integrator Uses external CR to from a low pass filter at the input side Uses external CR to from a l...

Page 42: ...C IN LOUT FK TK LIN BIAS GND RIN LPF1 LPF2 LPF3 ROUT CONTA CONTB CONTC Power supply Microphone mixing input Channel L output Non connect Non connect Channel L input Signal bias Connect to GND Channel R input Connects to LPF time constant element Connects to LPF time constant element LPF outpout Channel R output Mode select input A Mode select input B Mode select input C I O I I I O O O O I I I Pin...

Page 43: ...Supply voltage Power Phase compensation Output 2 I O O I I I O DRIVER OUT PRE DRIVER LOGIC SWITCH TSD BIAS 1 2 3 4 5 6 7 8 9 10 GND VO1 VZ1 VCTL VIN1 VIN2 SVCC PVCC VZ2 VO2 KA3082 IC401 IC402 DC motor driver 1 Pin layout 2 Pin function Symbol GND VO1 VZ1 VCTL VIN1 VIN2 SVCC PVCC VZ2 VO2 Pin No 1 2 3 4 5 6 7 8 9 10 ...

Page 44: ...ICTOR COMPANY OF JAPAN LIMITED AUDIO COMMUNICATION BUSINESS DIVISION PERSONAL MOBILE NETWORK BUSINESS UNIT 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan No 21121 MX K50 Printed in Japan 200211 ...

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