JVC MX-K50 Page 18 Service Manual Download | Manualshive

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MX-K60/MX-K50

1-18

AM(MW) OSC
Adjustment

Output

1~7.0

0.5V

Received FREQ.

Adjustment

point

530~1710 KHz

MO

AM(MW) RF
Adjustment

ITEAM

603 KHz

MA

Maximum
Output(Fig.1)

TESTER

MAIN
PCB

VT

GND

Fig.1 OSC Voltage

Adjustment method

1. Tuner

* Adjustment Location of Tuner PCB

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Summary of Contents for MX-K50

Page 1: ... 1 22 1 23 1 23 1 24 1 27 39 MX K60 Area suffix C Canada MX K50 Area suffix J U S A C Canada Model MX K60 MX K50 Color Black Silver 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 PLAYBACK TUNING CLOCK TIMER DISPLAY PHONES REPEAT REC START STOP CD REC START DUBBING PROGRAM RANDOM TAPE B TAPE A TAPE CD FM AM ACTIVE BASS EX LEVEL SOUND MODE MX K50 C ...

Page 2: ...roduct 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 exp...

Page 3: ...tinued protection against risk of fire replace only with same type 5A 125V for RFS2 4A 125V for RFS5 and RFS6 6 3A 125V for RFS7 and RFS8 This symbol specifies type of fast operating fuse Precaution Pour eviter risques de feux remplacez le fusible de surete de et RFS2 comme le meme type que 5A 125V 4A 125V pour RFS5 et RFS6 6 3A 125V pour RFS7 et RFS8 Ce sont des fusibles suretes qui functionnes r...

Page 4: ...up 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 a...

Page 5: ...e CD 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 servo board Disconnect the harn...

Page 6: ...he screw G attaching the main board to front panel assembly Remove the screw H attaching the front panel assembly to the 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 servo board CD changer unit Main board CW105 Rear panel C D both sides Rear p...

Page 7: ... board inward 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 chan...

Page 8: ...ower 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 power supply 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 Disconnect the power cord from the connector RCW2 on t...

Page 9: ...lume knob and active bass ex level knob from front side Remove the twelve screws C attaching the front key switch board Remove the front board releasing the two tabs 1 2 3 Removing the front key switch board See Fig 2 and 3 Front panel assembly Prior to performing the following procedure remove the FL display system control board You can pull out the headphone jack board 1 Removing the headphone j...

Page 10: ...own fig 4 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 to 3 Reinstall the CD tray See Fig 4 and 5 CD changer unit Fig 2 Fig 1 Fig 3 Fig 4 Fig 5 Loading pulley gear CD changer uint reverse side CD servo board CD tray CW103 CD tray CD tray Gea...

Page 11: ...ard and release the harness from the two hooks c Remove the sensor board Remove the screw B attaching the turn table Detach the turn table from the tray Pull outward the tab marked d attaching the turn table motor assembly on the upper side of the tray and detach the turn table motor assembly from the tray 1 2 3 4 Removing the sensor board the turn table motor assembly See Fig 6 to 8 Fig 7 Fig 6 F...

Page 12: ...d 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 servo board and First release the two tabs f and two tabs g attaching the CD servo board motor to raise the CD servo board slightly then release the CD servo board If the tabs f and g are hard to release it is recommendab...

Page 13: ...the 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 mechani...

Page 14: ...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 Fig 1 Cut washer Unsolder A A ...

Page 15: ... erase 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 roll...

Page 16: ...he 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 b...

Page 17: ...CW2 RFS2 Power transformer RFS5 RFS6 RFS7 RFS8 PCW1 ACW1 ACW2 FL dispaly system control board 3809 001222 3809 001184 3809 001228 AH39 20002D AH39 00022A AH39 00247A AH39 200060A 3809 001185 AH39 00245A 3809 001224 3809 001315 AH39 20561P 3809 001121 AH38 12001A 3809 001034 Amp board Power CD switch board Front key switch board Tuner board Main board Headphone J board Color codes are shown below 1...

Page 18: ...djustment Output 1 7 0 0 5V Received FREQ Adjustment point 530 1710 KHz MO AM MW RF Adjustment ITEAM 603 KHz MA Maximum Output Fig 1 TESTER MAIN PCB VT GND Fig 1 OSC Voltage Adjustment method 1 Tuner Adjustment Location of Tuner PCB ...

Page 19: ... G level 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...

Page 20: ...K 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 i...

Page 21: ... Item 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 ...

Page 22: ...Approx 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 patt...

Page 23: ...de 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 ...

Page 24: ...MX K60 MX K50 1 24 Troubleshooting 1 Amplifier Power malfunction No output 5 6 7 5 6 7 ...

Page 25: ...MX K60 MX K50 1 25 2 Tuner malfunction FM AM HA12235F HA12235F 16 3 4 27 28 JIC1 HA12235F PIN5 26 JC63L JC63R JR65L JR65R 3 Tape ...

Page 26: ...MX K60 MX K50 1 26 4 CD ...

Page 27: ...ltage 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 Description of major ICs ...

Page 28: ...KO LCHOUT RCHOUT 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 VS...

Page 29: ...k Input 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...

Page 30: ...t FZC 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 MDAT...

Page 31: ...p inverting 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 inpu...

Page 32: ...de by 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...

Page 33: ...1 17 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 determine...

Page 34: ...13 14 15 16 17 18 19 20 Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 Symbol PB NF2 R PB EQ R EQOUT R TAI R PBOUT R NC RECIN R NC RECOUT R ALC ON OFF High Norm A B 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 Pin No 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Symbol TAI L EQOUT L PB EQ L PB NF...

Page 35: ...11 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 AIC1 Power amp 1 Pin layout ...

Page 36: ...100nF 100nF 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...

Page 37: ...8 OUT 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 SW...

Page 38: ...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 39: ...S0 T0 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...

Page 40: ...200203 VICTOR COMPANY OF JAPAN LIMITED AUDIO COMMUNICATION BUSINESS DIVISION PERSONAL MOBILE NETWORK BUSINESS UNIT 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan No 21069 MX K60 MX K50 ...

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