JVC MXJ-200 Service manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-J200

B E EN EE EV

MX-J200MX-J200

Area Suffix

U.K.

Continental Europe

Northern Europe

Russia

Eastern Europe

RM-SMXJ300V REMOTE CONTROL

CLOCK TIMER

2 3

–+

SELECT

SLEEP

4 5 6

SET

AUX

7 8 9

FM MODE

FM/AM

10+10

PLAY MODE

CD3CD2CD1

C D

/CLEAR

TAPE

A – TAPE - B

REC PAUSE

SHIFT

ACTIVE

SOUND

VOLUME

MODE

BASS EX.

Contents

Safety Precautions Important for laser products Preventing static electricity Disassembly method Adjustment method

STANDBY

COMPACT

DIGITAL AUDIO

PLAY & EXCHANGE

1 BIT

DUAL D/A CONVERTER

PHONES

COMPU

PLAY

CONTROL

EJECT

CLOCK/TIMER DISPLAYSET CANCEL

REC

START/STOP

PRESET

TAPE

DUBBING

CD REC START

AUX

REVERSE MODE TAPE A/B

PLAY

FULL – LOGIC CONTROL

MX-J200

DEMO

–

SOUND MODE ACTIVE BASS EX

AUTO REVERSE

TUNNER

REC/PLAY

VOLUME

–

PROGRAM

RANDOM

REPEAT

FM /AM

EJECT

COMPACT

DIGITAL AUDIO

1-2 1-3 1-4 1-5 1-21

Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs

1-24 1-25 1-25 1-26

No.20860

Aug. 2000

MX-J200

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. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.

2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics.

These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

5. Leakage currnet 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 into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet , particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.)

Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

Place this probe on each exposed metal part.

Warning

1. This equipment has been designed and manufactured to meet international safety standards.

2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

3. Repairs must be made in accordance with the relevant safety standards.

4. It is essential that safety critical components are replaced by approved parts.

5. If mains voltage selector is provided, check setting for local voltage.

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

1-2

CAUTION

Important for laser products

MX-J200

1.CLASS 1 LASER PRODUCT

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. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent 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.

VARNING : Osynlig laserstrålning är denna del är öppnad

och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet

alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen.

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 radiation exposure.

CAUTION

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

ADVARSEL : Usynlig laserstråling ved åbning , når

sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.

ADVARSEL : Usynlig laserstråling ved åpning,når

sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

DANGER : Invisibie laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e)

VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen. (d)

CLASS 1 LASER PRODUCT

VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen. (s)

ADVARSEL :Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. (f)

1-3

MX-J200

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.

2. About the earth processing for the destruction prevention by static electricity

In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment. Be careful to use proper grounding in the area where repairs are being performed.

2-1 Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

2-2 Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

3. Handling the optical pickup

1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

2. Do not use a tester to check the condition of the laser diode in the optical pickup. 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-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector.

3. Handle the flexible cable carefully as it may break when subjected to strong force.

4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it

Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for pick-up and how to detach the CD traverse mechanism.

1. Remove the disk stopper and T. bracket on the CD changer mechanism assembly.

2. Disconnect the harness from connector on the CD motor board.

3. CD traverse unit is put up as shown in Fig.1.

4. Solder is put up before the card wire is removed from connector CN601 on the CD servo control board as shown in Fig. 2. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.)

5. Please remove solder after connecting the card wire with CN601 when you install picking up in the substrate.

CD changer mechanism

assembly

CD traverse

unit

Flexible cable

Fig.1

Soldering

Fig.2

1-4

MX-J200

Disassembly method

Removing the 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.

Remove the metal cover from the body while lifting up the rear part of the cover.

Metal cover

Fig.1

Metal cover

Fig.2

Metal cover

Fig.3

1-5

MX-J200

Removing the CD changer mechanism assembly (See Fig.4 to 7)

Prior to performing the following procedures, remove the metal cover.

Remove the two screws C attaching the CD changer mechanism assembly on the top of the body.

Disconnect the card wire from connector CN303 on top of the main board.

Rlease the harness from the clamp on the lower part of the CD changer mechanism assembly.

Remove the plastic rivet a fixing the main board to

the front assembly on the left side of the body.

Remove the two screws D from the rear panel.

Detach backward the front part of the CD changer mechanism assembly while pulling the front panel assembly and the rear panel outward, then pull out the upward the rear part of the CD changer mechanism assembly.

CD changer mechanism assembly

Plastic rivet a

Fig.4

Main board

CN303

Rear panel

CD changer mechanism assembly

Front panel assembly

Pull outward

Front panel

Rear panel

Pull outward

Fig.5

CN303

Main board

Rear panel

1-6

Main board

Fig.7

Fig.6

MX-J200

Removing the front panel assembly

(See Fig.8 to 13)

Prior to performing the following procedures, remove the metal cover and the CD changer mechanism assembly.

Disconnect the card wires from connector CN301, CN304, CN305 and the harness from CN302 on the inside of the main board.

Remove the screw E' attaching the earth wire.

Turn over the body and remove the two screws E.

Release the joint b on the bottom and the joint c and d on both sides of the body using a screwdriver, and detach the front panel assembly toward the front.

Front panel assembly

Main board

Fig.8

Main board

CN301

CN304

Joint c

Fig.11

Fig.12

Eath wire

Front panel assembly

CN305

CN302

CN901A,CN901B

Fig.9

(Bottom)

Joint b

Front panel assembly

Fig.13

Front panel assembly

Joint d

Fig.10

1-7

MX-J200

Removing the heat sink cover and the rear panel (See Fig.14 to 17)

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.

Remove the two screws F and the rear cover on the back of the body.

Remove the four screws G and the six screws H attaching the main board and the heat sink to the rear panel.

Remove the screw I attaching the rear panel to the chassis base.

Release the lower two joints e and f on both sides of the rear panel using a screwdriver and detach the rear panel backwards.

Rear cover

(To Earth bracket)

Rear panel

Fig.14

Rear panel

Fig.15

1-8

Joint f

Fig.17

Rear panel

Joint e

Rear panel

Fig.16

MX-J200

Removing the main board (See Fig.18 and 19)

Prior to performing the following procedures, remove the metal cover, the CD changer mechanism assembly and the rear cover and the rear panel. It is not necessary to remove the front panel assembly.

Disconnect the card wires from connector CN301, CN304, CN305 and the harnesses from CN302, CN901A and CN901B on the inside of the main board.

From the left side of the body, remove the screw L attaching the main board to the chassis base.

Remove the main board from the body

Removing the heat sink (See Fig.20 and 21)

Prior to performing the following procedure, remove the main board.

Main board

CN304

CN305

CN302

CN901A,CN901B

CN301

Fig.18

Main board

Rear panel

Remove the two screws J and the screw K attaching the heat sink to the main board. Remove the IC304 and IC bracket on the back of the heat sink.

IC304

Heat sink

Fig.19

Main board

Heat sink

IC bracket

Fig.21

Fig.20

1-9

MX-J200

Removing the power transformer assembly (See Fig.22 to 24)

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.

Cut off the tie band g of the power transformer assembly and unsolder the power cord. (Make sure to bundle the wires after repair.)

Remove the four screws M attaching the power transformer assembly.

When removing the power transformer assembly with the power cord, remove the rear panel and pull out the power cord stopper from the bottom chassis upward.

CN901A,CN901B

Tie band g

Power transformer assembly

Fig.22

Tie band g

Rear panel

Power cord stopper

Power transformer assembly

Fig.23

1-10

Power transformer assembly

Fig.24

MX-J200

Removing the cassette mechanism assembly (See Fig.25)

Prior to performing the following procedure, remove 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.

Remove the six screws N attaching the cassette mechanism assembly.

Cassette mechanism assembly

Cassette amplifier board

CN352

Fig.25

Removing the cassette amplifier board

(See Fig.26 and 27)

Prior to performing the following procedure, remove the cassette mechanism assembly.

Disconnect the card wire from connector CN353 on the cassette amplifier board.

ATTENTION:

Unsolder the soldering i on the flexible wire for the cassette amplifier board head at the bottom of the cassette mechanism assembly. Then disconnect the harness from CN354 on the cassette amplifier board, and release the harness from the clamp on the upper part of the cassette amplifier board.

Remove the four screws P attaching the cassette amplifier board on the bottom of the cassette mechanism assembly.

When reconnecting the card wire, get it pass through under the harness h on the DC motor (The Flg.26 shows the details).

Harness h

DC motor

CN354

Cassette amplifier board

Cassette mechanism board

CN352

Fig.26

(Bottom)

CN353

Soldering h

R/P head

Fig.27

1-11

MX-J200

Removing the display board and the side brackets (See Fig.28 and 29)

Prior to performing the following procedure, remove the metal cover, CD changer mechanism assembly and the front panel assembly.

Disconnect the card wires from connector CN701,

1. CN702, CN704 and CN706 and, then the harness from CN708 on the display board.

Remove the four screws Q on the bracket attaching

2. the display.

Remove the two screws R attaching the display

3. board and front panel assembly.

Remove the two screws S attaching the display

4. board and side brackets, then remove the side brackets respectively.

Removing each board in the front panel assembly (See Fig.30 and 31)

Prior to performing the following procedure, remove the display board.

~Removing the multi-control board~ (See Fig.30)

Remove the ten screws T attaching the multi-control board.

Bracket

CN708

Side bracket

CN706

Display board

Side

bracket

CN702 CN701

Fig.28

(Bottom)

Fig.29

CN704

Headphone jack board

Display board

Side

bracket

Side bracket

Unsolder FW1002 and FW1004 on the multi-control board. Disconnect the harnesses extending from the power switch board and the eject switch board respectively.

~Volume board~ (See Fig.30 and 31)

Pull out the volume knob on the front of the front panel assembly and remove the nut attaching the volume board.

Unhook the two hooks j on the back of the front panel assembly and detach the volume board.

~Eject switch board ~ (See Fig.30)

Remove the four screws U attaching the eject switch

board.

Unsolder FW1004 on the eject switch board and

disconnect the harness extending from the multicontrol board.

~Power switch board~ (See Fig.30)

Remove the three screws V attaching the power

switch board.

Unsolder FW1002 on the power switch board and

disconnect the harness extending from the multicontrol board.

~Headphone jack board~ (See Fig.30)

Remove the screw W attaching the headphone jack board.

1-12

Eject switch board

FW1004

Volume board

FW1004

Multi-control board

Volume board

Hooks j

FW1002

Fig.30

Fig.31

Power switch board

FW1002

Headphone jack board

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 board.

4.Absorb the four soldered positions "a" of the right and left motors with a soldering absorber.

5.Pull out the earth wire on the CD changer mechanism assembly.

6.The two screws B is removed and C.B.holder is detached.

7.Disconnect the connector CN854 on the CD servo control board.

8.Disconnect the card wire CN601 and the connector CN801 on the CD servo control board.

MX-J200

CN854

CN651

CD servo control board

CN652

CN801

CN601

CN151

Removing the CD tray assembly (See Fig.2~4)

Remove the front panel assembly.

1. Remove the CD changer mechanism assembly.

2. Remove the CD Servo control board.

3. Remove the screw C' retaining the lod stopper.

4. From the T.bracket section "b" and clamper base

5. section "c" , remove both of the edges fixing the rod(See Fig.2 and 3). Remove the screw D retaining the disc stopper

6. (See Fig.3). Remove the three screws E retaining the T.bracket

7. (See Fig.3). Remove the screw F retaining the clamper assembly

8. (See Fig.3). From the left side face of the chassis assembly, remove

9. the one screw G retaining both of the return spring and lock lever(See Fig. 4).

10.

By removing the pawl at the section "d" fixing the return spring, dismount the return spring(See Fig.4).

11.

Remove the three lock levers(See Fig.4).

T.Braket

Disc stopper

Earth

wire

C.B.Holder

Fig.1

Clamper base

Rod

T.Braket

Fig.2

Lod stopper

Lock lever

Clamper ass'y

Fig.3

Fig.4

Return spring

1-13

MX-J200

11.

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

12. shown in Fig.6 from to the second or fifth hole on the left side face of the CD changer mechanism assembly.

[Caution]

13.

14.

15.

Chassis assembly

In case the driver unit elevator is not at above position, set the elevator to the position as shown in Fig.7 by manually turning the pulley gear as shown in Fig.8.

Manually turn the motor pulley in the clockwise direction until the lifter unit stopper is lowered from the section "e" of CD tray assembly(See Fig.8). Pull out all of the three stages of CD tray assembly in the arrow direction "f" until these stages stop (See Fig.6). At the position where the CD tray assembly has stopped, pull out the CD tray assembly while pressing the two pawls "g and g' " on the back side of CD tray assembly(See Fig.9). In this case, it is easy to pull out the assembly when it is pulled out first from the stage CD tray assembly.

Stopper

CD tray assembly

Fig.5

Refer to Fig.7

Pulley gear

Pawl

Fig.6

CD tray assembly

Drive unit of elevator

Fig.7

CD tray assembly

1-14

Motor pulley

Fig.8

Pawl ,

Fig.9

MX-J200

Removing the CD loading mechanism assembly(See Fig.10)

1.2.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. Remove the four screws H retaining the CD loading mechanism assembly.

Removing the CD traverse mechanism (See Fig.11 and 12 )

For dismounting only the CD traverse mechanism

1. without removing the CD loading mechanism assembly, align the shaft "j" of the CD loading mechanism assembly to the position shown Fig.11 while turning the cam R1 and R2 assembly in the arrow direction "k" . By raising the CD loading mechanism assembly in the

2. arrow direction "l", remove the assembly from the lifter unit

Cam R1, R2 assembly

Cams R1, R2 assembly

Arrow

CD loading mechanism assembly

Fig.10

CD traverse mechanism

Arrow

Fig.11

Removing the CD pick unit (See Fig.13 )

Move the cam gear in the arrow direction "m" . Then, the CD pickup unit will be moved in the arrow direction "n" . According to the above step, shift the CD pickup unit to

2. the center position. While pressing the stopper retaining the shaft in the

3. arrow direction "o" , pull out the shaft in the arrow direction "p". After dismounting the shaft from the CD pickup unit,

4. remove the CD pickup unit

Lifter unit

Stopper

Shaft

Fig.12

CD Pickup unit

Shaft

Stopper

Fig.13

Arrow

CD loading

mechanism

Shaft

Cam gear

1-15

MX-J200

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.15) on the cam gear "q". Pull out the drive unit and cylinder gear(See Fig.16).

3. While turning the cam gear "q", align the pawl "s"

4. position of the select lever to the notch position(Fig.17) on the cam gear "q". Remove the four screws J retaining the cam unit(cam

5. gear "q" and cams R1/R2 assembly)(See Fig.17).

Chassis assembly

CN801

CN802

Fig.14

Drive unit

Tray select switch board

Cylinder gear

CN804

Drive unit

Cam gear

Fig.15

Cams R1, R2 assembly

Cam unit

1-16

Fig.16

Select lever

Fig.17

MX-J200

Removing the actuator motor and belt (See Fig.18~21)

Remove the two screws K retaining the gear bracket (See Fig.18).

While pressing the pawl "t" fixing the gear bracket in the arrow direction, remove the gear bracket (See Fig.18). From the notch "u section" on the chassis assembly

3. fixing the edge of gear bracket, remove and take out the gear bracket(See Fig. 19). Remove the belts respectively from the right and left

4. actuator motor pulleys and pulley gears(See Fig. 18). After turning over the chassis assembly, remove the

5. actuator motor while spreading the four pawls "v" fixing the right and left actuator motors in the arrow direction(See Fig. 20).

[Note]

When the chassis assembly is turned over under the conditions wherein the gear bracket and belt have been removed, then the pulley gear as well as the gear, etc. constituting the gear unit can possibly be separated to pieces. In such a case, assemble these parts by referring to the assembly and configuration diagram in Fig. 21.

Chassis assembly

Pulley gear

Gear bracket

Belt

Motor pulley

Fig.18

Actuator motor

Pulley gear Belt Motor pulley

Pawl

Gear bracket

Fig.19

Assembly and Configuration Diagram

Pulley gear

Gear B

Fig.20

Pulley gear

Gear B

Cylinder gear

Gear C

Select gear

Gross gear L

Fig.21

Gross gear U

Gear C

1-17

MX-J200

Removing the cams R1/R2 assembly and cam gear q(See Fig.22)

Remove the slit washer fixing the cams R1 and R2

1. assembly. By removing the two pawls "w" fixing the cam R1,

2. separate R2 from R1. Remove the slit washer fixing the cam gear "q".

3. Pull out the cam gear "q" from the C.G. base assembly.

Removing the C.G. base assembly (See Fig.22 and 23)

Remove the three screws L retaining the C.G. base assembly.

[Caution]

To reassemble the cylinder gear, etc.with the cam unit (cam gear and cans R1/R2 assembly), gear unit and drive unit, align the position of the pawl "x" on the drive unit to that of the notch on the cam gear "q". Then, make sure that the gear unit is engaged by turning the cam gear "q" (See Fig. 23).

Slit washer

Cam gear q

Slit washer

Cam R2

Pawl

Cam R1

Cam switch board

C.G. base assembly

Pawl

Notch

Pawl

Cylinder gear

Drive unit

Fig.22

Cam gear q

Cam R1, R2 assembly

Gear unit

Gear bracket

Fig.23

1-18

MX-J200

< Cassette mechanism section >

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.

Remove the two screws A retaining the R/P head assembly.

Refer to the figure for soldering

Cassette mechanism board

Head wire

Solder part

R/P head assembly

Fig.1

Fig.2

Removing the P/B head assembly

(See Fig.3)

Loosen the screw B attaching the P/B head assembly.

Remove the screws C retaining the P/B head assembly.

Removing the Pinch roller assembly

(See Fig.4)

Pull the tab a outward and remove the pinch roller upward.

Fig.3

Tab a

Pinch roller

Fig.4

1-19

MX-J200

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

Capstan motor

Fig.6

Un solder

Removing the Capstan belt (See Fig.7)

Remove the capstan motor.

Remove the capstan belt.

ATTENTION: Do not stain the belt with grease.

Cassette mechanism assembly

Fig.5

Capstan motor

FR belt

Solder part

FR belt

1-20

Capstan belt

Fig.7

Adjustment method

Measurement instruments required for adjustment

1. Low frequency oscillator, This oscillator should have a capacity to output 0dB to 600ohm at an oscillation frequency of 50Hz-20kHz.

2. Attenuator impedance : 600ohm

3. Electronic voltmeter

4. Frequency counter

5. Wow flutter meter

6. Test tape VT712 : For Tape speed and wow flutter ( 3kHz) VT703 : For Head angle(10kHz),Play back frequency characteristics(1kHz),and dubbing frequency characteristics(63,1,10kHz) Because of frequency-mixed tape with 63,1k,10k and 14kHz(250nWb/m -24dB). Use this tape together with a filter.

7. Blank tape TAPE : AC-225, TAPE : AC-514

8. Torque gauge : For play and back tension Forward ; TW2111A, Reverse ; TW2121A Fast Forward and Rewind ; TW2231A

9. Test disc : CTS-1000(12cm),GRG-1211(8cm)

10. Jitter meter

Measurement conditions

Power supply voltage AC230V(50Hz)

Measurement output terminal : Speaker out : TP101(Measuring for TUNER/DECK/CD) : Dummy load 6ohm

MX-J200

Radio input signal

AM modulation frequency : 400Hz Modulation factor : 30% FM modulation frequency : 400Hz Frequency displacement : 22.5kHz

Frequency Range

AM 522kHz~1629kHz LW 144kHz~288kHz FM 87.5MHz~108MHz : except EE

65MHz~74MHz/87.5MHz~108MHz : only EE

Standard measurement positions of volume and switch

Power : Standby (Light STANDBY Indicator) S,A,BASS : OFF Sound mode : OFF Main VOL. : 0 Minimum Travers mecha set position : Disc 1

Precautions for measurement

1. Apply 30pF and 33kohm to the IF sweeper output side and 0.082 F and 100kohm in series to the sweeper input side.

2. The IF sweeper output level should be made as low as possible within the adjustable range.

3. Since the IF sweeper is a fixed device, there is no need to adjust this sweeper.

4. Since a ceramic oscillator is used, there is no need to perform any MPX adjustment.

5. Since a fixed coil is used, there is no need to adjust the FM tracking.

6. The input and output earth systems are separated. In case of simultaneously measuring the voltage in both of the input and output systems with an electronic voltmeter for two channels, therefore, the earth should be connected particularly.

7. In the case of BTL connection amplifier, the minus terminal of speaker is not for earthing. Therefore, be sure not to connect any other earth terminal to this terminal. This system is of an OTL system.

1-21

+ 49 hidden pages