JVC MX-J300 Service Manual
Compact component system
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Table of Contents
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SERVICE MANUAL
COMPACT COMPONENT SYSTEM
RM-SMXJ300V REMOTE CONTROL
CLOCK
TIMER
1
2
3
-
SELECT
+
SLEEP
4
5
6
SET
AUX
7
8
9
FM MODE
FM/AM
10
+
10
CD1
CD2
CD3
PLAY MODE
C D
/CLEAR
TAPE
REC PAUSE
A - TAPE - B
SHIFT
SOUND
ACTIVE
VOLUME
MODE
BASS EX.
Contents
STANDBY
COMPACT
DIGITAL
AUDIO
PLAY & EXCHANGE
1 BIT
DUAL D/A CONVERTER
PHONES
PANEL OPEN / CLOSE
POWERED ROLLING PANEL
TAPE
COMPU
AUX
PLAY
CONTROL
EJECT
PLAY
AUTO REVERSE
FULL - LOGIC CONTROL
1-2
1-3
1-4
1-5
1-24
COPYRIGHT
2000 VICTOR COMPANY OF JAPAN, LTD.
3
CD
CD
3
2
CD
2
CD
CD
1
1
CD
VOLUME
+
-
C D
FM /AM
EJECT
REC/PLAY
DIGITAL AUDIO
Flow of functional
operation until TOC read
MX-J300
Area Suffix
B
U.K.
E
Continental Europe
EN
Northern Europe
EE
Russia
EV
Eastern Europe
COMPACT
1-27
1-28
1-28
1-29
No.20852
Jul. 2000
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Summary of Contents for JVC MX-J300
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Page 1: Table Of Contents
MX-J300 SERVICE MANUAL COMPACT COMPONENT SYSTEM MX-J300 Area Suffix U.K. Continental Europe Northern Europe Russia Eastern Europe STANDBY COMPACT DIGITAL AUDIO PLAY & EXCHANGE VOLUME RM-SMXJ300V REMOTE CONTROL CLOCK TIMER 1 BIT DUAL D/A CONVERTER – SELECT SLEEP – MX-J300... -
Page 2: Safety Precautions
MX-J300 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. -
Page 3: Important For Laser Products
MX-J300 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 lock failed or defeated. Avoid direct exposure to beam. 3.CAUTION : There are no serviceable parts inside the Laser Unit. -
Page 4: Preventing Static Electricity
MX-J300 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: Disassembly Method
MX-J300 Disassembly method <Main body> Removing the metal cover Metal cover (See Fig.1 to 3) Remove the six screws A attaching the metal cover on the back of the body. Remove the two screws B on both sides of the body. - Page 6 MX-J300 Removing the CD changer mechanism assembly (See Fig.4 to 7) Prior to performing the following procedures, remove the metal cover. Wire clamp The flat cable which has gone out of the headphone Main board CN303 board is removed from the wire clamping under CD CD changer changer mechanism assembly.
- Page 7 MX-J300 Removing the front panel assembly (See Fig.8 to 12) Main board Prior to performing the following procedures, remove the metal cover and the CD changer mechanism Front panel assembly. assembly Disconnect the card wires from connector CN301, CN304, CN305 and the harness from CN302 on the inside of the main board.
- Page 8 MX-J300 Removing the rear cover and the rear Rear panel panel (See Fig.13 to 16) Prior to performing the following procedures, remove the metal cover and the CD changer mechanism assembly. It is not necessary to remove the front panel assembly.
- Page 9 MX-J300 Removing the main board CN301 (See Fig.17 to 20) Main board Prior to performing the following procedures, remove the metal cover, the CD changer mechanism assembly and the rear cover, rear panel. CN304 It is not necessary to remove the front panel assembly.
- Page 10 MX-J300 Removing power transformer assembly (See Fig.21 to 23) CN901A,CN901B Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly. Disconnect the harness from connector CN901A and CN901B on the inside of the main board.
- Page 11 MX-J300 <Front panel assembly> Removing cassette mechanism assembly (See Fig.24) Cassette Prior to performing the following procedure, remove mechanism assembly the metal cover, the CD changer mechanism assembly and the front panel assembly. Disconnect the card wire from connector CN352 on the cassette amplifier board.
- Page 12 MX-J300 Removing the rolling panel assembly (See Fig.27 to 29) Prior to performing the following procedure, remove Bracket the metal cover, the CD changer mechanism assembly and the front panel assembly. Display board Disconnect the card wire from connector CN704 and the harness from CN706, CN707 and CN708 on the display board over the rolling panel.
- Page 13 MX-J300 Removing each board in the front panel Eject switch board assembly (See Fig.31 to 33) Power switch board FW1004 FW1002 Prior to performing the following procedure, remove the rolling panel assembly. ~Function board 1~ (Fig.31 and 33) Volume board...
- Page 14 MX-J300 <Rolling panel assembly> Prior to performing the following procedures, remove the metal cover the CD changer mechanism Multi control assembly assembly, the front panel assembly and the rolling panel assembly. It is not necessary to remove the display board.
- Page 15 MX-J300 Removing the drive motor assembly (See Fig.40 to 41) Prior to performing the following procedures, remove Motor bracket the display board. Remove the two screws A attaching the motor bracket, then detach the motor leads from the fixing plate n.
- Page 16 MX-J300 Removing the CD Servo control board (See Fig.1) 1.Remove the metal cover. 2.Remove the CD changer mechanism assembly. 3.From bottom side the CD changer mechanism assembly, remove the two screws A retaining the CD servo control CN854 board. 4.Absorb the four soldered positions "a" of the right and left motors with a soldering absorber.
- Page 17 MX-J300 Stopper Check whether the lifter unit stopper has been caught into the hole at the section "e" of CD tray assembly as shown in Fig.5. Make sure that the driver unit elevator is positioned as shown in Fig.6 from to the second or fifth hole on the left side face of the CD changer mechanism assembly.
- Page 18 MX-J300 Cams R1, R2 assembly Removing the CD loading mechanism assembly(See Fig.10) While turning the cams R1 and R2 assembly in the arrow direction "h" ,align the shaft "i" of the CD loading mechanism assembly to the position shown in Fig.10.
- Page 19 MX-J300 Removing the cam unit (See Fig.14 ~17 ) Remove the CD loading mechanism assembly. While turning the cam gear "q", align the pawl "r" position of the drive unit to the notch position(Fig.16) on the cam gear "q". Pull out the drive unit and cylinder gear(See Fig.17).
- Page 20 MX-J300 Removing the actuator motor and belt Gear bracket (See Fig.18~21) Remove the two screws K retaining the gear bracket (See Fig.19). While pressing the pawl "t" fixing the gear bracket in the arrow direction, remove the gear bracket Pulley gear (See Fig.19).
- Page 21 MX-J300 Slit washer Removing the cams R1/R2 assembly and cam gear q(See Fig.22) Cam R2 Slit washer Remove the slit washer fixing the cams R1 and R2 assembly. Cam gear L By removing the two pawls "w" fixing the cam R1, separate R2 from R1.
- Page 22 MX-J300 < Cassette mechanism section > R/P head assembly Prior to performing the following procedures, remove the metal cover the CD changer mechanism assembly, the front panel assembly and cassette mechanism assembly. Removing the R/P head assembly (See Fig.1to2) Unsolder the head wire from the cassette mechanism board.
- Page 23 MX-J300 Removing the Capstan motor (See Fig.5to7) Remove the two screws D attaching the capstan motor. Unsolder the motor wire. Motor wire Marke red line Un solder Tape speed adjustment hall Cassette mechanism assembly Fig.5 Capstan motor Fig.6 Removing the Capstan belt (See Fig.7)
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Page 24: Adjustment Method
MX-J300 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 0dBs Modulation factor : 30% to 600ohm at an oscillation frequency of 50Hz-20kHz. -
Page 25: Mx-J300
MX-J300 Arrangement of adjusting positions Cassette mechanism section (Mechanism A section) Cassette mechanism section (Back side) Head azimuth Head azimuth adjusting screw adjusting screw (Reverse side) (Forward side) Head azimuth Head azimuth adjusting screw Playback,recording and eraser adjusting screw Playback... - Page 26 MX-J300 Reference values for confirmation items Adjusting Items Measurement Standard Measurement method positions conditions values Check in the Test tape After setting to the double speed motor, confirm 4,800+400/ Playback double tape :VT712(3kHz) that the frequency counter reading becomes -300Hz...
- Page 27 MX-J300 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 CN801 is "H"\"L"\"H". Automatic tuning of TE offset Check that the voltage at the...
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Page 28: Maintenance Of Laser Pickup
MX-J300 Maintenance of laser pickup Replacement 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 29: Description Of Major Ics
MX-J300 Description of major ICs BA15218 (IC302,IC303) : OP AMP. OUT1 -IN1 OUT2 +IN1 -IN2 +IN2 BA3126N (IC401) : R/P Switch C O N T . TA8409S (IC703,IC851,IC852) : Motor driver 1.Pin layout 2.Pin function INPUT OUTPUT MODE OUT1 OUT2... - Page 30 MX-J300 AN8806SB (IC601) : RF&Servo AMP 1.Pin layout PDAC PDBD LDON PDER PDFR TBAL RF OUT FBAL RF IN C.AGC EF OUT C.ENV TE OUT C.EA CROSS CS BDO TE BPF VDET CS BRT LD OFF OFTR VREF /RFDET 2.Block diagram...
- Page 31 MX-J300 3. Pin function Pin No. Symbol Description APC amp input terminal APC amp output terminal LD ON APC ON/OFF control terminal Connect to ground Power supply Inverse input pin for RF amp RFamp output RF OUT RF IN RF input Connecting pin of AGC loop filter C.AGC...
- Page 32 MX-J300 MN35510 (IC651) : DIGITAL SERVO&DIGITAL SIGNAL PROCESSOR 1. Terminal Layout 20 ~ 41 ~ 2.Block Diagram LRCKIN(MSEL) AVSS1 8TIMES BCLK(SSEL) AVDD1 DIGITAL OVER SAMPUNC SRDATAIN OUTR DEEMPHSIS DIGITAL FILTER 1BIT (PSEL) LOGIC IOSEL CLVS BLKCK OUTL CLDCK SBCK SUBC...
- Page 33 MX-J300 3. Description symbol I/O Description symbol I/O Description Tracking error shunt signal output(H:shunt) BCLK Not used Not used LRCK PLAY Not used SRDATA WVEL Not used Not used Power supply (Digital) DVDD1 RF signal input DVSS1 Connected to GND...
- Page 34 MX-J300 BA6897FP (IC801) : 4channel driver 1.Pin layout & Block diagram 13.3K 13.3K REGULATOR DRIVER MUTE T.S.D 13.3K 13.3K D . B U F T.S.D;Thermal shutdown 2.Pin function D.BUF:Drive buffer Symbol Function Symbol Function Driver CH1 - output Operation amplifier + output...
- Page 35 MX-J300 LC72136N (IC2) : PLL Frequency synthesizer 1. Pin layout FM/AM LPFOUT LPFIN CLOCK FM/ST/VCO FMIN AM/FM AMIN IFCONT SDIN IFIN 2. Block Phase Reference Detector Driver Charge Pump Swallow Counter Swallow Counter 1/16,1/17 4bit 1/16,1/17 4bit Unlock Detector 12bit...
- Page 36 MX-J300 UPD78055GCA37 (IC251):CD Changer control 1. Terminal Layout 20 ~ 41 ~ 2. Pin function symbol I/O Description Description Symbol DEMPH Deemphasis input LM DOWN L CAM down DEMPHO Deemphasis output RM UP R CAM up On screen display on/off...
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Page 37: Block Diagram
MX-J300 Block diagram CN804 CN805 CN601 CN854 CN801 CN855 CN353 CN351 CN651 CN303 CN301 VCK VDATA CN304 CN305 CN702 CN701... - Page 38 MX-J300 Standard schematic diagrams Power Transformer section E/EN/EE/EV/B Version 230V 50Hz T951 F952 T1.6A F951 AC-PLUG T1.25A EI-76 Parts are safety assurance parts. When replacing those parts make sure to use the specified. SHEET 1/5...
- Page 39 MX-J300 Main section J301 R101 AUX-L R315 2.2K Q102 C102 50V1 2SC2785 R307 22K C301 1000P R102 6.8K SP-L + R116 R314 470K D303 1SS133 RY301 12V R202 6.8K SP-L - R112 6.8K C202 50V1 R201 R111 C315 50V1 R121 680...
- Page 40 MX-J300 Control section SW PWB (4) S1007 S1001 SW PWB (1) FL701 POWER LED11 Q701 Q702 Q703 R1006 KTC3199 KTC3199 KTC3199 S1008 BASS W1002 INFO R.D.S NEWS S1009 S. MODE 1 CD MONO SLEEP W1002 PRGM RANDOM REPEAT DAILY -35V...
- Page 41 MX-J300 Tape section R9001 R352 Q501 REC-REV DTC114TS Q502 HEAD SW HALF-SW 2SD2144S HALF SW REC-FWD C504 0.018-M R502 6.8K HIGH HIGH R503 9.1K HEAD SW R501 100K C519 C503 R507 C511 25V10 PB-HD R513 C515 25V4.7 CN353 PB-HD IC401...
- Page 42 MX-J300 CD Servo & CD Mechanism control selection CD CHANGER CONTROL RF & SERVO AMP. DIGITAL SERVO & DIGITAL SIGNAL PROCESSER CD signal SHEET 5/5...
- Page 43 MX-J300 Printed circuit boards Main board...
- Page 44 MX-J300 Display and multicontrol board...
- Page 45 MX-J300 Cassette amplifier board...
- Page 46 MX-J300 CD servo control board CD Tray section switch board Cam switch board 2-10...
- Page 47 MX-J300 Power transformer board 2-11...
- Page 48 MX-J300 -MEMO- 2-12...
- Page 49 MX-J300 PARTS LIST [ MX-J300 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix B ------------------------------- U.K. E ----------- Continental Europe EN ------------ Northern Europe EV -------------- Eastern Europe EE --------- Russian Federation...
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Page 50: Mx-J300
MX-J300 -MEMO-... -
Page 51: Exploded View Of General Assembly And Parts List
MX-J300 Exploded view of general assembly and parts list Block No. For spring protect... - Page 52 MX-J300 (General assembly) Parts list (General assembly) Parts list Block No. M1MM Block No. M1MM Item Parts number Parts name Q'ty Description Area Item Parts number Parts name Q'ty Description Area GJ460400390101 PANEL HOLDER R GJ460400090101 KNOB VOLUME GJ460400070102 KNOB POWER...
- Page 53 MX-J300 (General assembly) Parts list Block No. M1MM Item Parts number Parts name Q'ty Description Area GJ336760070013 POWER TRANS. 1 T951 --------------- POWER TRANS.BOA GJ530432052119 AC-POWER CORD QMPK15-200-JD AC-POWER CORD E,EN,EE,EV GJ560170290101 BRACKET OPENING GJ782010070100 RUBBER SHEET GJ711001790100 EJECT SPRING L...
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Page 54: Cd Mechanism Assembly And Parts List
MX-J300 CD mechanism assembly and parts list Block No. Grease Point FG-87HS (Grease to apply have to be a little for the exchange.) FG-87HS FG-87HS FG-87HS EXL-M7TMB EXL-M7MB Parts list ( CD mechanism ) Block No. M2MM Description Item Parts number... -
Page 55: Cd Changer Mechanism Assembly And Parts List
MX-J300 CD changer mechanism assembly and parts list Block No. VC3-21M... - Page 56 MX-J300 (CD changer mechanism) Parts list Block No. M3MM Item Parts number Parts name Q'ty Description Area VKS1144-003 CHASSIS VKS3698-003 TRAY GUIDE VKS5532-003 PULLEY GEAR VKB3000-164 BELT VKS5505-003 GEAR B VKS5506-002 GEAR C VKS5507-002 CROSS GEAR U VKS5508-002 CROSS GEAR L...
- Page 57 MX-J300 (CD changer mechanism) Parts list Block No. M3MM Item Parts number Parts name Q'ty Description Area --------------- CD MECHA QGB2012J1-10 CONNECTOR VKW5187-001 VYSA1R2-033 SPACER FOR EWS176-008 LE30611-001A C.B HOLDER FOR CD CB QYSBSF3008Z SCREW FOR HOLDER QUQ610-1509AJ CARD WIRE...
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Page 58: Cassette Mechanism Assembly And Parts List
MX-J300 Cassette mechanism assembly and parts list Block No. Unit number : CMAT5Z214A Parts list ( Cassette mechanism ) Block No. M4MM Parts name Q'ty Item Area Parts number Description 03-1 F513-852 PLATE HD BLK F513-855 PLATE HD BLK 03-2... -
Page 59: Electrical Parts List
MX-J300 Electrical parts list (Main board) Electrical parts list Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area GJ116415921 C.CAPACITOR 0.1MF F Z 50V C 111 GJ283118232432 CAPACITOR 100V K 0.082UF GJ116415921 C.CAPACITOR... - Page 60 MX-J300 (Main board) Block No. 01 Electrical parts list Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 321 GJ116230621 A.CAPACITOR 16V Y M 0.01UF D 301 MTZJ5.1A ZENER DIODE GJ871992333 C 322 GJ270141060310 E.CAPACITOR...
- Page 61 MX-J300 (Main board) Block No. 01 Electrical parts list Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area Q 51 DTA114YSTP TRANSISTOR GJ872990281 R 55 GJ250084722103 CARBON RESISTOR 1/6W J 4.7K Q 102 KTC3199/GL/-T TRANSISTOR...
- Page 62 MX-J300 Block No. 01 Electrical parts list (Main board) Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 208 GJ250081042103 CARBON RESISTOR 1/6W J 100K R 331 GJ250082212103 CARBON RESISTOR 1/6W J 220 R 209...
- Page 63 MX-J300 (Display board) Block No. 02 Electrical parts list Item Parts number Parts name Remarks Area Item Remarks Parts number Parts name Area C 701 GJ116415921 C.CAPACITOR 0.1MF F Z 50V Q 715 DTC114YSTP TRANSISTOR GJ872990437 C 702 GJ112689891 E.CAPACITOR...
- Page 64 MX-J300 (Display board) Block No. 02 Electrical parts list Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 763 GJ250084732103 CARBON RESISTOR 1/6W J 47K RA728 GJ250082242103 CARBON RESISTOR 1/6W J 220K R 764...
- Page 65 MX-J300 (Eject switch board) Block No. 06 Electrical parts list (H.phonejack board) Block No. 09 Electrical parts list Item Remarks Item Parts number Parts name Remarks Area Parts number Parts name Area R1010 GJ250086812103 CARBON RESISTOR 1/6W J 680 C1051 GJ116229421 A.CAPACITOR...
- Page 66 MX-J300 (Cassette amplifier board) Block No. 10 Electrical parts list Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 351 GJ270192250310 E.CAPACITOR 50V VX M 2.2UF C9003 GJ260771812412 C.CAPACITOR 50V SL J 180PF C 352 GJ270121070310 E.CAPACITOR...
- Page 67 MX-J300 (Cassette amplifier board) Block No. 10 Electrical parts list Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 366 GJ250084722103 CARBON RESISTOR 1/6W J 4.7K R 520 GJ250082222103 CARBON RESISTOR 1/6W J 2.2K...
- Page 68 MX-J300 Block No. 12 Electrical parts list (CD servo board) Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 251 NCS21HJ-100X C CAPACITOR CN651 QGF1016F1-19 CONNECTOR MAIN C 252 NCS21HJ-100X C CAPACITOR CN652 QGF1016F1-05...
- Page 69 MX-J300 (CD servo board) Block No. 12 Electrical parts list Item Item Parts number Parts number Parts name Parts name Remarks Remarks Area Area Item Parts number Parts name Remarks Area R 612 NRSA02J-125X MG RESISTOR R 863 NRSA02J-102X MG RESISTOR...
- Page 70 MX-J300 Packing materials and accessories parts list Block No. B,E,EN,EV Version Block No. 3-22...
- Page 71 MX-J300 (Packing B,E,EN,EV) Parts list Block No. M5MM Item Parts number Parts name Q'ty Description Area GJ560400180101 CARTON GJ560400170101 CARTON SPEAKER BOX GJ560400140101 POLYFOAM RIGHT GJ560400130101 POLYFOAM LEFT GJ560400160101 POLYFOAM BOTTOM GJ560400150101 POLYFOAM TOP GJ740082550400 POLYBAG REMOTE CONTROL GJ740666420300 POLYBAG...
- Page 72 MX-J300 Packing materials and accessories parts list Block No. EE Version Block No. 3-24...
- Page 73 MX-J300 (Packing EE) Parts list Block No. M7MM Item Parts number Parts name Q'ty Description Area GJ560400190201 CARTON GJ560400120101 POLYFOAM RIGHT GJ560400110101 POLYFOAM LEFT GJ560400160101 POLYFOAM BOTTOM GJ560400150101 POLYFOAM TOP GJ740082550400 POLYBAG REMOTE CONTROL GJ740666420300 POLYBAG GJ740362550000 POLYBAG INSTRUCTIONS GJ740486230300...
- Page 74 MX-J300 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.20852 200007(V)