JVC MX-J300 Service Manual

Compact component system

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Instructions manual (34 pages)

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Page 1: Table Of Contents
MX-J300 SERVICE MANUAL COMPACT COMPONENT SYSTEM MX-J300 Area Suffix U.S.A. Canada COMPACT DIGITAL AUDIO STANDBY POWER COMPACT DIGITAL AUDIO PLAY & EXCHANGER VOLUME 1 BIT DUAL D/A CONVERTER – MX-J300 RM-SMXJ300V REMOTE CONTROL CLOCK TIMER POWER PHONES – SELECT SLEEP...
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 6.CAUTION : Use of controls, adjustments or performance of lock failed or defeated. Avoid direct exposure to beam.
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. CD changer Remove the two screws C attaching the CD changer Main board mechanism assembly CN303 mechanism assembly on the top of the body.
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 Removing the R/P head assembly (See Fig.1to2) Unsolder the head wire from the cassette mechanism board. Remove the two screws A retaining the R/P head assembly. Refer to the figure for soldering...
Page 23 MX-J300 Removing the Capstan motor (See Fig.5 to 7) Remove the two screws D attaching the capstan motor. Unsolder the motor wire. Motor wire Marke red line Un solder Cassette mechanism assembly Fig.5 Capstan motor Fig.6 Removing the Capstan belt (See Fig.7)
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 Playback,recording and eraser adjusting screw adjusting screw Playback...
Page 26 MX-J300 Reference values for confirmation items Adjusting Items Measurement Standard Measurement method positions conditions values Double tape Test tape After setting to the double speed motor, confirm 4,800+400/ Playback speed :VT703(10kHz) that the frequency counter reading becomes -300Hz mechanism side...
Page 27: Flow Of Functional Operation Until Toc Read
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...
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 BA6897FP-W(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 D.BUF:Drive buffer 2.Pin function Symbol Function Symbol Function Driver CH1 - output...
Page 30 MX-J300 AN8806SB-W (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 /NRFDET 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 BA15218F(IC303):OP AMP. OUT1 -IN1 OUT2 +IN1 -IN2 +IN2 BA3126N(IC31) : R/P Switch TA8409S(IC851,IC852):Motor driver 1.Pin layout 2.Pin function INPUT OUTPUT MODE OUT1 OUT2 MOTOR OUT 2 STOP CW/CCW CCW/CW BRAKE OUT 1 TA8409S 1-32...
Page 33 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 34: Digital Audio
MX-J300 MN35510 (IC651) : DIGITAL SERVO&DIGITAL SIGNAL PROCESSER 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 35 MX-J300 3. Description symbol I/O Description symbol I/O Description Tracking error shunt signal output(H:shunt) BCLK Not used LRCK Not used PLAY Not used SRDATA WVEL Not used Not used Power supply (Digital) DVDD1 RF signal input DVSS1 Connected to GND...
Page 36 MX-J300 UPD78055GCA37 (IC251):CD Changer control 1. Terminal Layout 20 ~ 41 ~ 2. Pin function symbol I/O Description Symbol Description DEMPH Deemphasis input LM DOWN L CAM down DEMPHO Deemphasis output RM UP R CAM up OS OFF On screen display on/off...
Page 37: Block Diagram
MX-J300 Block diagram...
Page 38 MX-J300 Standerd schematic diagrams Power transformar section J/C Version 120V 50Hz R951 3.3M 1/2W T951 F951 F952 1.6A 250V AC-PLUG 3.15A 250V EI-76...
Page 39 MX-J300 Main amplifier section MAIN signal TAPE P.B. signal AM signal FM / TUNER signal CD signal Parts are safety assurance parts. When replacing those parts make sure to use the specified. SHEET 3/5 SHEET 3/5 SHEET 5/5 SHEET 2/5...
Page 40 MX-J300 Control section LED11 W1002 W1002 W1004 LED12 LED13 LED14 LED15 S1001 S1002 S1003 SHEET 3/5...
Page 41 MX-J300 Cassette amplifier section TAPE P.B. signal SHEET2/5 SHEET3/5 SHEET4/5...
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 Control & SW board...
Page 45 MX-J300 Cassette amplifier board Power supply board...
Page 46 MX-J300 CD servo control board CD Tray section switch board Cam switch board 2-10...
Page 47 Warnings, Cautions and Others Mises en garde, précautions et indications diverses CAUTION CAUTION To reduce the risk of electrical shocks, fire, etc.: 1. Do not remove screws, covers or cabinet. RISK OF ELECTRIC SHOCK DO NOT OPEN 2. Do not expose this appliance to rain or moisture. CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, ATTENTION...
Page 48 For Canada/pour le Canada For Canada/pour le Canada CAUTION: TO PREVENT ELECTRIC SHOCK, MATCH WIDE THIS DIGITAL APPARATUS DOES NOT EXCEED THE CLASS BLADE OF PLUG TO WIDE SLOT, FULLY INSERT. B LIMITS FOR RADIO NOISE EMISSIONS FROM DIGITAL ATTENTION: POUR EVITER LES CHOCS ELECTRIQUES, APPARATUS AS SET OUT IN THE INTERFERENCE-CAUSING INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS EQUIPMENT STANDARD ENTITLED “DIGITAL APPARATUS,”...
Page 49 Introduction We would like to thank you for purchasing one of our JVC products. Before operating this unit, read this manual carefully and thoroughly to obtain the best possible performance from your unit, and retain this manual for future reference.
Page 50 Contents Location of the Buttons and Controls ....... 3 CA-MXJ300 Front Panel ........... 4 CA-MXJ200 Front Panel ........... 6 Remote Control ............7 Getting Started ............8 Unpacking ..............8 Putting the Batteries into the Remote Control ... 8 Connecting Antennas ..........8 Connecting Speakers ..........
Page 51: Location Of The Buttons And Controls
To close the panel, press the button again. STANDBY POWER COMPACT PLAY & EXCHANGER DIGITAL AUDIO VOLUME 1 BIT DUAL D/A CONVERTER – MX-J300 PHONES POWERED ROLLING PANEL PANEL OPEN / CLOSE TAPE COMPU FM /AM PLAY CONTROL EJECT EJECT...
Page 52: Ca-Mxj300 Front Panel
Continued Display Window BASS ALL 1 CD MONO S.MODE SLEEP PRGM RANDOM REPEAT DAILY s DUBBING button (21) See pages in the parentheses for details. d CD REC START button (21) f REVERSE MODE button (19, 21) CA-MXJ300 Front Panel g TAPE A/B button (19) h 7 (stop) button (15, 19) 1 Disc trays...
Page 53 CA-MXJ200 Become familiar with the buttons and controls on your unit. STANDBY POWER COMPACT PLAY & EXCHANGER DIGITAL AUDIO VOLUME 1 BIT DUAL D/A CONVERTER – MX-J200 PHONES DEMO CLOCK/TIMER CANCEL DISPLAY PROGRAM START/STOP – PRESET – TUNING TAPE DUBBING RANDOM COMPU CD REC START...
Page 54: Ca-Mxj200 Front Panel
Continued Display Window BASS ALL 1 CD S.MODE MONO SLEEP PRGM RANDOM REPEAT DAILY d DISPLAY button (11) See pages in the parentheses for details. f TUNING – / + buttons (14) These buttons do not function as 1 / ¡. CA-MXJ200 Front Panel g PROGRAM button (16, 21) h CD 6 (play/pause) button and lamp (15)
Page 55: Remote Control
VOLUME + / – buttons (12) l ACTIVE BASS EX. (extension) button (13) STANDBY POWER COMPACT DIGITAL AUDIO PLAY & EXCHANGER VOLUME 1 BIT DUAL D/A CONVERTER – MX-J300 PHONES PANEL OPEN / CLOSE POWERED ROLLING PANEL TAPE COMPU FM /AM PLAY CONTROL EJECT EJECT...
Page 56: Getting Started
Getting Started Continued Unpacking Connecting Antennas FM antenna After unpacking, check to be sure that you have all the following items. The number in the parentheses indicates the quantity of the pieces supplied. • AM loop antenna (1) • FM antenna (1) •...
Page 57: Connecting Speakers
AM antenna Connecting Speakers You can connect a pair of the front speakers. Vinyl-covered wire (not supplied) ANTENNA CAUTION: SPEAKER IMPEDANCE 6~16 OHMS SPEAKERS Speaker Speaker RIGHT LEFT cord cord AM LOOP Black AM loop antenna (supplied) Left Right Connect the AM loop antenna to the AM speaker speaker LOOP terminals as illustrated.
Page 58: Connecting Other Equipment
Connecting Other Equipment NOW, you can plug in the unit and other connected equipment FINALLY! You can connect an audio equipment — used only as a playback device. When you connect and use this equipment, refer also to its manual. ANTENNA Be sure that the plugs of the audio cords are color coded: AM LOOP...
Page 59: Common Operations
Press SELECT – or + to adjust the hour, then press SET. Before operating the unit any further, first set the clock built in this unit. For MX-J300 only BASS SOUND MODE Press PANEL OPEN/CLOSE . • If you want to correct the hour after pressing...
Page 60: Turning On The Power And Selecting The Sources
VOLUME AM, CD 6, AUX, and TAPE 2 3), the unit turns on. (For Turn VOLUME clockwise to increase the MX-J300 only, the Powered Rolling Panel opens volume or counterclockwise to decrease automatically.) The unit starts playing the source if it is ready — COMPU –...
Page 61: Reinforcing The Bass Sound
Reinforcing the Bass Sound The richness and fullness of the bass sound is maintained regardless of how low you set the volume. You can use this effect only for playback. To get the effect, press ACTIVE BASS EX. ACTIVE BASE EX. BASS SOUND MODE The BASS indicator also lights up on the display.
Page 62: Listening To Fm And Am Broadcasts
– PRESET Press PRESET – / + to select a the previously tuned station (either FM or AM). (For MX-J300 only, the Powered preset number. Rolling Panel automatically opens.) • Each time you press the button, the band alternates between FM and AM.
Page 63: Playing Back Cds
You can play CDs continuously. you want to load a CD onto. The unit automatically turns on and the disc Load CDs. tray comes out. (For MX-J300 only, the Powered Rolling Panel also opens Press one of the disc number automatically.) buttons (CD 1, CD 2, and CD 3) for the disc you want to play.
Page 64: Programming The Playing Order Of The Tracks - Program Play
Continued – To locate a particular point in a track PRESET Select the Program play mode. PROGRAM During play, press and hold 4 or ¢. On the unit: • 4 : Fast reverses the disc. Press PROGRAM. • ¢ : Fast forwards the disc. On the remote control: PLAY MODE Press PLAY MODE repeatedly until the...
Page 65: Playing At Random - Random Play
To stop during play, press 7 on the unit (or CD 7/CLEAR Playing at Random — Random Play on the remote control). The tracks of all loaded CDs will play at random. To exit from program play mode • To use Repeat play for Random play, press REPEAT after On the unit: starting Random play.
Page 66: Repeating Tracks Or Cds - Repeat Play
Repeating Tracks or CDs — Repeat Play You can have all the CDs, the program or the individual track currently playing repeat as many times as you like. To repeat play, press REPEAT during or before REPEAT playing. To use Repeat play for Program play and Random play, press the button after starting playback.
Page 67: Playing Back Tapes
Playing Back Tapes To fast wind to the left or to the right, press 4 or ¢ (or This unit provides two types of cassette deck: Deck A for 1 or ¡ on the remote control). one-way playing only and deck B for Reverse Mode playing The tape direction indicator (2 3) starts flashing quickly on as well as one-way playing.
Page 68: Recording
Recording Continued IMPORTANT: Recording Tapes on Deck B • It should be noted that it may be unlawful to re-record pre-recorded tapes, records, or discs without the Press EJECT 0 for the deck B. consent of the owner of copyright in the sound or video recording, broadcast or cable programme and in any literary, dramatic, musical, or artistic embodied therein.
Page 69: Dubbing Tapes
CD Direct Recording To stop recording temporarily (except when the REC PAUSE playback source is deck A), press REC PAUSE on the remote control. Everything on the CD goes onto the tape in the order it is on The REC indicator flashes on the display. the CD, or according to the order you have made for Program play.
Page 70: Using The Timers
Using the Timers Continued There are three timers available — Recording Timer, Daily – PRESET Set the on-time you want the unit Timer, and Sleep Timer. to turn on. 1) Press 4 or ¢ to set the hour, then Before using the timers, you need to set the clock built in the unit.
Page 71: Timer Setting
On the remote control: When selecting “– CD – – –” – PRESET 1) Press 4 or ¢ to select the disc SHIFT Press SHIFT. number, then press SET. 2) Press 4 or ¢ to set the track number, then press SET. Press TIMER.
Page 72: Using Recording Timer
Continued Using Recording Timer – SELECT Press SELECT – or SELECT + to select the source to play, then press With Recording Timer, you can make a tape of a radio SET. broadcast automatically. • Each time you press SELECT + or SELECT –, the source changes as follows: How Recording Timer actually works TUNER FM...
Page 73: On The Remote Control
On the remote control: – PRESET Set the on-time you want the unit to turn on. 1) Press 4 or ¢ to set the hour, then Put a recordable cassette into deck B. press SET. 2) Press 4 or ¢ to set the minute, SHIFT Press SHIFT.
Page 74: Using Sleep Timer
Timer Priority Select the preset station. – SELECT 1) Press SELECT – or SELECT + to select Since each timer can be set separately, you may wonder what the band (“TUNER FM” or “TUNER happens if the setting for these timers overlaps. AM”), then press SET.
Page 75: Maintenance
Maintenance To get the best performance of the unit, keep your discs, tapes, and mechanism clean. Handling cassette tapes Handling discs • If the tape is loose in its cassette, take • Remove the disc from its case by up the slack by inserting a pencil in holding it at the edge while pressing the one of the reels and rotating.
Page 76: Troubleshooting
Troubleshooting If you are having a problem with your unit, check this list for a possible solution before calling for service. If you cannot solve the problem from the hints given here, or the unit has been physically damaged, call a qualified person, such as your dealer, for service.
Page 77 Sophisticated electronic products may require occasional service. Just as quality is a keyword in the engineering and production of the wide array of JVC products, service is the key to maintaining the high level of performance for which JVC is world famous. The JVC service and engineering organization stands behind our products.
Page 78 WHAT WE WILL DO: If this product is found to be defective, JVC will repair or replace defective parts at no charge to the original owner. Such repair and replacement services shall be rendered by JVC during normal business hours at JVC authorized service centers.
Page 79 VICTOR COMPANY OF JAPAN, LIMITED 0200KSMMDWHIT...

JVC MX-J300 Service Manual

Service Manual

MX-J300

Digital Audio

Table of Contents

Location of the Buttons and Controls

Getting Started

Common Operations

Listening to FM and am Broadcasts

Playing Back Cds

Playing Back Tapes

Recording

Using the Timers

Maintenance

Troubleshooting

Specifications

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Chapters

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Summary of Contents for JVC MX-J300

Table of Contents