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JVC CA-MXJ100, Service Manual

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JVC CA-MXJ100 Service Manual Download Page 20

MX-J100

1-20

FM THD Adjustment

Output

Output

28 dB(±2dB)

60 dB

Minumum Distortion (0.3% below)
(Figure 1-1)

SSG FREQ.

Adjustment
point
(TL3)

98 MHz

FM DETECTOR COIL

FM Search Level Adjustment

Adjust TSR1 so that “TUNED” of  FL T
is lighted (Figure 1-2)

Figure1-2  FM Auto Search Level Adjustment

*Adjust FM S.S.G level to 28dB

Figure1-1  IF CENTER and THD Adjustment

SSG FREQ.

Adjustment
point

(TSR1)

98 MHz

BEACON
SENSITIVITY
SEMI-VR(20K½)

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 k½

OUTPUT

AM SSG
450KHZ

INPUT

AM ANT

IN

Speaker Terminal

60cm

TL2

VTVM

Oscilloscope

AM(MW) I.F Adjustment

Maximum output (Figure 1-3)

SSG FREQ.

Frequency

Adjustment
point
(TL2)

450 kHz

520 kHz

AM I.F COIL

Figure1-3  AM I.F Adjustment

OUTPUT

Summary of Contents for CA-MXJ100

Page 1: ...T DIGITAL AUDIO SP MXJ100 SP MXJ100 CA MXJ100 OPEN CLOSE POWER STANDBY DISC CHANGE COMPACT DIGITAL AUDIO PLAY REC PLAY CD SYNCHRO RECORDING EJECT EJECT PROGRAM SET COUNTER RESET ACTIVE BASS EX SOUND MODE CLOCK TIMER REPEAT AUX FM AM TUNING TUNING CD TAPE TAPE A B CD REC START A B DUBBING REC PAUSE FULL LOGIC CONTROL DEMO VOLUME CD1 CD2 CD3 PLAY EXCHANGER PHONES COMPU PLAY CONTROL PRESET CD PROGRAM...

Page 2: ...nt check Electrical shock hazard testing After re assembling the product always perform an isolation check on the exposed metal parts of the product 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 i...

Page 3: ...es invisible laser radiation 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 m...

Page 4: ...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 5: ...body and the six screws D on both sides Slide the right and left covers backward and unhook the two hooks a in the lower part of the side covers as shown in Fig 2 2 1 2 3 4 Main body Removing the top cover and the side covers See Fig 1 to 3 Disassembly method Fig 1 Fig 2 Fig 2 2 Fig 3 Top cover A A A C C Side cover L Side cover R Side cover R B D D D Top cover Hooks a Top cover Hooks a B D D D Sid...

Page 6: ...CD tray fitting before removing the CD changer unit ATTENTION Turn the black loading pulley gear marked c from the back of the CD changer unit as shown in Fig 7 and draw the CD tray toward the front Move the CD tray fitting upward and release the joint b Push and insert the CD tray manually 1 2 3 Removing the CD Tray fitting See Fig 5 to 7 How to eject the CD tray without turning on power Fig 4 Fi...

Page 7: ...e harness from connector FW2 on the inner side of the mother main board in the body Remove the two screws E attaching the CD changer unit on the back of the body Draw the CD changer unit upward from behind while pulling the rear panel outward 1 2 3 4 Removing the CD changer unit See Fig 8 to 10 Fig 8 Fig 9 Fig 10 SCW1 CD servo board CD changer unit Mother main board FW2 Rear panel E Rear panel Fro...

Page 8: ...y on both sides of the body Remove the screw V attaching the earth terminal extending from the front compartment Remove the screw G attaching the front panel assembly on the bottom of the body Release the two joints d on both sides and two joints e on the bottom of the body using a screwdriver At the same time disconnect the front compartment from connector CCW1 and CCW2 of the mother main board 1...

Page 9: ...harness from connector HCW1 of the mother main board on the right side of the body Release the harness from the clamp in the body Disconnect the harness from head wire connector DW1 and DW2 extending to the mother main board in the body Disconnect the harness from connector RCW1 of the power transformer Remove the screw K attaching the earth terminal to the base chassis Disconnect connector CCW1 a...

Page 10: ... Release the two tabs g outward and remove the tuner board from the holder 1 2 Removing the tuner Board See Fig 18 to 20 Prior to performing the following procedure remove the top cover and the side covers Disconnect the power cord from connector RCW2 of the power transformer Disconnect the harness from connector RCW1 of the power transformer Remove the four screws P attaching the power transforme...

Page 11: ...e side covers the CD tray fitting and the front panel assembly Removing the power CD switch board See Fig 22 Disconnect the card wire from the mechanism board of the cassette mechanism assembly Remove the seven screws U attaching the cassette mechanism assembly 1 2 Removing the cassette mechanism assembly See Fig 25 Front panel assembly Remove the system board temporarily and remove the screw T at...

Page 12: ...e gear cam with the gear tray as shown fig 29 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 26 to 28 Reinstall the CD tray See Fig 29 to 30 CD changer unit Fig 27 Fig 26 Fig 28 Fig 29 Fig 30 Loading pulley gear marked c CD tray CD tray CD tray ...

Page 13: ... k Remove the sensor board Remove the screw W attaching the tray turn table Detach the tray turn table from the tray Pull outward the tab marked m attaching the tray turn table motor assembly on the upper side of the tray and detach the tray turn table motor assembly from the tray 1 2 3 4 Removing the sensor board the tray motor See Fig 31 to 33 Fig 32 Fig 31 Fig 33 Tab j Tab j Hooks k Sensor boar...

Page 14: ...o attaching the CD servo board motor to raise the CD servo board slightly then release the o side If the tabs n and o are hard to release it is recommendable to unsolder the two soldered parts on the motor terminal of the CD servo board Disconnect the terminal CW3 connected to the switch board and remove the CD servo board Release the three tabs p attaching the switch board outward and detach the ...

Page 15: ...nism holder assembly from behind in the direction of the arrow Turn the CD mechanism holder assembly half around the lift up slide shaft r 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 holder assembly mechanism included See Fig 36 to 39 Fig 36 Fig 37 Fig 38 Fig 39 Motorconnecter CD mechanism assemb...

Page 16: ... Fig 4 3 Pull out the shaft by opening the pickup shaft stopper outward to unlock Fig 1 Fig 2 4 Removing the pickup unit Fig 1 Removing the feed motor Remove the two motor fixing screws at B and removing the feed motor Fig 1 Fig 3 Removing the spindle motor The spindle motor cannot be removed as a single unit When removing the spindle motor change the chasis and turntable together as aunit Fig 5 A...

Page 17: ...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 18: ...e s splash when the drive belt comes off Fig 5 Fig 6 2 Unsolder the motor terminal Fig 5 Removing the mechanism board 1 Unsolder the four parts a on the solenoid coil terminal Fig 5 2 Remove the two screws E fixing the 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 re...

Page 19: ... Fig 1 4 OSC Voltage Ajustment method Tuner Adjustment Location of Tuner PCB AM MW OSC Adjustment Output 1 7 0 0 5V Received FREQ Adjustment point 520 1720 KHz Non Adjustment AM MW RF Adjustment ITEAM 590 KHz MW ANT Maximum Output Fig1 4 ...

Page 20: ... to 28dB Figure1 1 IF CENTER and THD Adjustment SSG FREQ Adjustment point TSR1 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 TL2 VTVM Oscilloscope AM MW I F Adjustment Maximum output Figure 1 3 ...

Page 21: ... to left and right FRONT PCB 3KHz Remark Standard To Adjust Pre Setup Item Step Pre Setup Condition 1 Deck A VT 712 2 Press PLAY SW button 3 Deck B Same as above Cassette Deck output SPK OUT Frequency Counter Figure 1 5 Figure 1 6 SPK OUT Recording Play head FWD PLAY REVERSE PLAY AZIMUTH control screw Figure 1 7 In Out Cassette Deck Oscilloscope 1 range Figure 1 8 Audio OSC SET MAIN PCB Oscillosco...

Page 22: ...p Item Step Pre Setup Condition After putting VT705 into Deck A Press FWD PLAY button AZIMUTH 1 2 TP1 OUT VTVM is connected to the scope Turn the control screw to as shown in Figure 1 6 Max output and same phase both channels After adjustment secure it with REGION LOCK 7V 0 5V Turn DVR1 DVR2 to the right and left Remark Standard To Adjust Pre Setup Item Step Pre Setup Condition Fig 1 8 After putti...

Page 23: ...x 3 7sec Pin 54 of KB9223 TE IC922 Approx 0 4V 2 50V Tracking error waveform at TOC reading Power ON Play Key Confirm that the voltage at the pin70 of KB9223 IC922 is 3 5V Confirm that the signal from pin46 of KB9223 IC922 is 3 5V as a accelerated pulse during approx 1 96s Confirm the waveform of the Tracking error signal at the pin 54 of KB9223 IC922 TOC reading Play a disc Confirm the eye patter...

Page 24: ...e of the laser diode has expired the following symptoms will appear 1 The level of RF output EFM output ampli tude of eye pattern will below Is the level of RFOUT under 1 1V 0 2Vp p Replace it NO YES O K 3 Semi fixed resistor on the APC PC board The semi fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power Since this adjustment should be...

Page 25: ...MX J100 1 25 LC75341 FIC1 Function Description of major ICs ...

Page 26: ...DD 21 Vss C 2 B 1 F P0WER ON RESET 7 8 9 10 BO1 BO2 BO3 BO4 11 IO1 13 IO2 18 PD 19 AIN 20 ADUT 12 IFIN REFERENCE DIVIDER PHASE DETECTOR CHARGE PUMP UNLOCK DETECTOR UNIVERSAL COUNTER DATA SHIFT REGISTER LATCH 12bita PROGRAMMABLE DIVIDER SWALLOW COUNTER 1 16 1 17 4D1ts 1 2 STK402 040 AIC1 ...

Page 27: ...MX J100 1 27 LA1837 TIC1 FM IF DET AM RF IF DET ...

Page 28: ...CKI ADATAI LRCHI EMPH VREFL1 VREFH1 XTALSEL TESTO CDROM TEST1 DATX RCHOUT LCHOUT S0S1 SBCK SDAT SUBCODE SYNC DETECTOR SUBCODE OUTPUT SUBCODE Q REGISTER EFM PHASE DETECTOR FRAME SYNC DETECTOR PROTECTOR INSERTER EFM DEMODULATOR SQDT SQCK DIGITAL PLL DIGITAL CLV SERVO 23BIT SHIFT REGISTER X TAL TIMING GENERATOR CPU INTERFACE TRACK COUNTER MODE SELECTOR DIGITAL OUTPUT ADDRESS GENERATOR 16K SRAM ECC IN...

Page 29: ...TEI RRC CH20 CH21 GC21 GC20 DCC1 RFO PD1 PD2 F E EI PD LD VR ARF IRF ASY EFM RFI DCB Focus Error Amp FE BIAS Adjustment Tracking Error Amp E F Balance Gain Control APC Amp Center Voltage Amp RF Level AGC Equalizer EFM Comparator Defect Dectection Circuit Micom Data Interface Logic MICOM TO SERVO CONTROL AUTO SEQUENCER ADJUSTMENT FREE CONTROL FS1 to FS4 TM to TM6 BAL1 to BAL5 PS1 to PS4 GA1 to GAS ...

Page 30: ...3 22 21 8 20 19 18 15 24 16 17 9 1 2 3 4 5 7 6 10 11 12 13 14 PB NF 2 PR IN 2 R P SW MUTE SW MUTE IN2 ALC RECOUT 2 100K PRE RECORD LREF PLAYBACK LREF PRE NF 100K INPUT PB BIAS REC BIAS INPUT N F MODE CONTROL BIAS CIRCUIT PU NF 1 PB IN 1 A B SW PB GND MUTE IN 1 REC OUT 1 PB OUT 1 REC GND Vcc Vcc PBOUT 2 100K PRE INPUT N F ALC DET PRE N F INPUT REC NF 2 REC IN 2 REC IN 1 REC IN 1 100K ALC TIME CONST...

Page 31: ...MX J100 ...

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