JVC MX-DVB9 Service manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

Area suffix

MX-DVB9

UT --------------------- Taiwan UX ------------- Saudi Arabia U ---------------- Other Areas

MX-DVB9

(SP-DSS99TN)

SURROUND

SP-MXG79

Contents

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

1-2 1-3 1-4 1-5 1-6 1-26

(SP-DSC99TN)

CENTER

CA-MXDVB9

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

(SP-DSS99TN)

SURROUND

SP-MXG79

1-34 1-34

1-35 1-36~70

No.21146

Sep. 2002

MX-DVB9

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 circuitr y 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 manufacturers 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 par ts 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 current 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 each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse 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.

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 m ust 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 v oltage.

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.

In regard with component parts appearing on the silk-screen pr inted side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety.

(This regulation does not correspond to J and C version.)

1-2

MX-DVB9

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.

1-3

MX-DVB9

Precautions for service

Handling of Traverse Unit and Laser Pickup

1. Do not touch any peripheral element of the pickup or the actuator.

2. The traverse unit and the pickup are precision devices and therefore must not be subjected to strong shock.

3. Do not use a tester to examine the laser diode. (The diode can easily be destroyed by the internal power supply of the tester.)

4. When replacing the pickup, after mounting a new pickup, remove the solder on the short land which is provided at the center of the flexible wire to open the circuit.

5. Half-fixed resistors for laser power adjustment are adjusted in pairs at shipment to match the characteristics of the optical block. Do not change the setting of these half-fixed resistors for laser power adjustment.

Destruction of Traverse Unit and Laser Pickup by Static Electricity

Laser diodes are easily destroyed by static electricity charged on clothing or the human body. Before repairing peripheral elements of the traverse unit or pickup, be sure to take the following electrostatic protection:

1. Wear an antistatic wrist wrap.

2. With a conductive sheet or a steel plate on the workbench on which the traverse unit or the pick up is to be repaired, ground the sheet or the plate.

When you remove the traverse mechanism from the servo control substrate

The laser diode of pick-up might be destroyed by static electricity and set switch (S11) on the pick-up board on "SHORT" side, please before removing the card wire from connector (CN10). Moreover, please set switch (S11) on "OPEN" side after assembling and inserting the card wire in connector (CN10) without fail at times.

Traverse

mechanism

CN10

CN12

SWITCH S11

SHORT

OPEN

When you remove the pick-up from the traverse mechanism

The laser diode of the pick-up might be destroyed by static electricity. Before extracting the flexible wire from connector (CN12), Please solder point A as shown below. Moreover, please remove solder in point A after inserting a flexible wire in connector (CN12).

Pick-up

1-4

Traverse mechanism

Soldering points A

Important for laser products

MX-DVB9

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 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 defeated. 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

CLASS 1 LASER PRODUCT

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)

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)

1-5

MX-DVB9

Disassembly method

Removing the metal cover

(See Fig.1 to 3)

Remove the six screws marked A on the back of the body.

Remove the two screws marked B on both sides of the body.

Remove the metal cover from the body by lifting the rear part of the cover.

CAUTION:

Do not break the front panel tab fitted to the metal cover.

Metal cover

Fig.1

Fig.3

Removing the tuner board

(See Fig.4)

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

Disconnect the card wire from connector CN1 on the tuner board.

Remove the plastic rivet fixing the tuner board.

Remove the two screws marked C on the back of the body.

Fig.2

DVD changer mechanism assembly

Rear panel

CN1

Plastic rivet

Front panel assembly

Tuner board

Fig.4

1-6

Removing the DVD changer mechanism assembly (See Fig.5 to 6)

Prior to performing the following procedures, remove the metal cover and the tuner board.

MX-DVB9

Disconnect the card wire from the connectors CN540, CN541 and CN542 on the main board.

Remove the two screws marked D on the upper side of the body and two screws marked F on the back of rear panel.

Remove the plastic rivet attaching the main board.

Pull both the rear panel and the front panel assembly to the outside, then remove the DVD changer mechanism assembly by lifting the rear part of the assembly.

CAUTION:

To prevent damage to the DVD fitting, be sure to pull both the rear panel and the front panel assembly enough to remove the DVD changer mechanism assembly.

Main board

CN542

CN541

CN540

Front panel assembly

DVD changer mechanism assembly

Fig.5

Rear panel

DVD changer mechanism assembly

Plastic rivet

Main board

Front panel assembly

Fig.6

Rear panel

1-7

MX-DVB9

Removing the front panel assembly

(See Fig.7 to 11)

Prior to performing the following procedures, remove the metal cover, the tuner board and the DVD changer mechanism assembly.

Remove the plastic rivet attaching the main board.

Disconnect the card wires from the connector CN500, CN505 and CN510 on the main board respectively.

Remove the tie band and disconnect the wire from the connector CN513 on the main board.

Disconnect the wire from the connector CN220 on the transformer board.

Remove the two screws marked G on the bottom of the body.

Release the two joints marked a on the lower right and left sides of the body using a screwdriver, and remove the front panel assembly toward the front.

CN513

Transformer board

CN220

Plastic rivet

Main board

Tie band

CN500

CN505 CN510

Front panel assembly

Fig.7

Front panel assembly

Fig.8

Main board

(Bottom)

Fig.9

1-8

Joint a

Front panel assembly

Fig.11

Front panel assembly

Joint a

Fig.10

MX-DVB9

Removing the rear cover / rear panel

(See Fig.12 to 15)

Prior to performing the following procedures, remove the metal cover, the tuner board and the DVD changer mechanism assembly.

Remove the screw marked H attaching the rear cover on the back of the body.

Push each tab of the four joints marked b in the direction of the arrow and release.

Remove the seventeen screws marked I attaching the rear panel.

Release the joints marked c on each lower side of the rear panel using a screwdriver and remove the rear panel backward.

Joint b

Rear cover

Fig.12

Rear panel

Joint b

Rear panel

Joint c

Fig.15

Rear panel

Removing the power cord

(See Fig.16)

Prior to performing the following procedures, remove the metal cover, the tuner board the DVD changer mechanism assembly and rear panel.

Move the power cord stopper upward and pull out it from the base chassis.

Disconnect the power cord from connector CN250 on the power supply board.

Remove the tie band from the power supply board.

Power supply

board

Power cord

stopper

Power cord

Rear panel

Fig.13

Joint c

Fig.14

Front panel assembly

CN250

Fig.16

Tie band

1-9

MX-DVB9

Removing the power supply board

(See Fig.17)

Prior to performing the following procedures, remove the metal cover, the tuner board, the DVD changer mechanism assembly, the rear panel and the power cord.

Remove the tie band marked a attaching the p

board.

supply

Disconnect the connector CN218 and CN219 on the p

ower supply board

Disconnect the connector CN203 on the p

board

from the regulator board.

ower

Power cord

ower supply

Removing the amplifier board (1, 2), AV output board & speaker terminal board

(See Fig.18 to 21)

Prior to performing the following procedures, remove the metal cover, the tuner board, the DVD changer mechanism assembly, the p the rear panel.

ower supply

board and

Power supply

board

CN219

CN203

CN218

Fig.17

Main board

Front panel assembly

Tie band

CN513

CN521

AV output

board

Tie band

Remove the tie band marked b attaching the wire to the AV output board.

Disconnect the card wire from the connector CN513 on the main board.

Disconnect the connector CN521 on the main board.

Disconnect the card wire from the connector CN703 on the amplifier board (2).

Disconnect the connectors CN205 and CN206 on the amplifier board (1, 2) from the regulator board (The heat sink and heat sink bracket will be detached at once).

Disconnect the connector CN207 on the speaker

terminal

board from the regulator board.

Speaker terminal

board

Main board

Amplifier board (1)

Heat sink

CN205

CN206

Fig.18

CN703

Fig.19

Main board

AV output

board

1-10

CN207

CN205

Regulator

board

CN206

Fig.21

Amp. board (2)

Amp. board (1)

Fig.20

MX-DVB9

Removing the AV output board

(See Fig.22, 23)

Prior to performing the following procedures, remove the metal cover, the tuner board, the DVD changer mechanism assembly, the rear panel, the amplifier board (1,2) and the power supply board.

Disconnect the connector CN705, CN372 and

1. CN373 on the amplifier board (1, 2).

Remove the two screws marked J attaching the AV

2. output board to the fan bracket.

Pull out the fan bracket from the

AV output board.

amplifier board (1)

AV output board

Fig.22

CN372

AV output board

Fan bracket

CN705

Fan

amplifier board (2)

Hook

CN373

Removing the Heat sink

(See Fig.24)

Prior to performing the following procedures, remove the metal cover, the tuner board, the power supply board, the DVD changer mechanism assembly, the rear panel, the tuner board, the amplifier board (1,2) and AV output board.

Remove the eight screws marked K attaching the ICs on the heat sink.

Removing the ICs (See Fig.25)

Prior to performing the following procedures, remove the metal cover, the tuner board, the DVD changer mechanism assembly, the rear panel, the tuner board, the AV output board, the amplifier board (1,2), the power supply board and the heat sink.

Unsolder the ICs s

older points

Heat sink

Fig.23

Heat sink

Amp. board (1, 2)

K K

Fig.24

Solder points

Remove the ICs.

Fig.25

1-11

MX-DVB9

Removing the main board

(See Fig.26, 27)

Prior to performing the following procedures, remove the metal cover, the tuner board, the DVD changer mechanism assembly, the rear panel, the power supply board, the amplifier board and AV output board.

Disconnect the card wires from the connector CN500, CN505 and CN510 on the main board.

Disconnect the flat wires from the connector CN220 on the transformer board.

Disconnect the connector CN530 and CN531 on the main board from the regulator board.

Remove the screw marked L attaching the main board on the right side of the body.

Main board

Transformer

board

CN220

Front panel assembly

Fig.26

Plastic rivet

CN500

CN505

CN510

Front panel assembly

Main board

Removing the regulator board / power transformer assembly (See Fig.28)

Disconnect the wire from connector CN204 on the regulator board.

Remove the two screws marked N attaching the regulator board.

Remove the four screws marked M attaching the transformer.

Regulator board

Regulator

board

CN204

Plastic

holder

Regulator board

Hook

Fig.27

Fig.28

CN530

CN531

Transformer

board

Power transformer assembly

1-12

MX-DVB9

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

Removing the cassette mechanism assembly (See Fig.29)

Disconnect the card wire from the connector CN306 on the head amplifier & mechanism control board.

Remove the seven screws marked O attaching the cassette mechanism assembly.

Removing the display & system control board (See Fig.30 to 32)

Remove the four screws marked P attaching the stay bracket.

Head amplifier & mechanism control board

CN306

Cassette mechanism assembly

Fig.29

Remove the seven screws marked Q attaching the

isplay & system control board

Disconnect the card wires from the connector CN316 and CN881 on the display & system control board.

Disconnect the connector CN870 on the

system control board

board

If necessary, disconnect the wire from the connector CN870 on the front side of the display & system control board and unsolder FW915.

from the p

display &

reset / tuning switch

Display & system control board

Fig.30

CN316

FW915

(Solders)

CN881

CN870

Stay bracket

CN870

Display & system control board

Fig.31

DVD eject board

FW915

Display & system control board

FW915

Fig.32

1-13

MX-DVB9

Removing the DVD eject board

(See Fig.33)

Remove the three screws marked R attaching the DVD eject board.

If necessary, unsolder FW915 on the DVD eject board.

Removing the preset / tuning switch

board

Prior to performing the following procedures, remove the display & system control board.

Pull out the PRESET knob on the front panel.

Remove the five screws marked S attaching the preset / tuning switch board.

If necessary, unsolder FW901 on the preset / tuning switch board.

(See Fig.34, 35)

Removing the operation switch board

(See Fig.35, 36)

Prior to performing the following procedures, remove the display & system control board and the preset / tuning switch board.

DVD eject board

FW915

(Soldered)

Preset / tuning switch board

FW901

(Soldered)

PRESET knob

Fig.33

Fig.34

Operation switch board

SOUND MODE knob

SUBWOOFER level knob

Pull out the volume knob on the front panel and remove the nut. Pull out the SOUND MODE knob and the SUBWOOFER level knob toward the front. Pull out the mic level knob toward the front.

Remove the twelve screws marked T attaching the operation switch board.

Release each tab of the seven joints marked g retaining the operation switch board.

Joint g

Joints g

T T

Volume knob

Joints g

Fig.35

Fig.36

Mic level knob

Nut

Operation switch board

Joint g

1-14

Removing the side cover (See Fig.1)

Remove the six screws marked A on the side of the body.

MX-DVB9

Removing the squawker (See Fig.2)

Prior to performing the following procedure, remove the side cover.

Remove the four screws marked B on the side of the body.

Disconnect the red and black wires from the speaker terminals on the squawker speaker.

Removing the front cover (See Fig.3 to 5)

Prior to performing the following procedure, remove the side cover.

Pull out the saran net toward the front while disengaging the four joints marked a.

Remove the two screws marked C and D respectively.

Remove the front cover toward the front and disconnect the yellow and black wires from the two tweeter speaker terminals.

Squawker

Fig.1

Fig.2

Side cover

Saran net

Tweeter

Fig.5

Joints a

Fig.3

Joints a

Front cover

Fig.4

1-15

MX-DVB9

Removing the woofer (See Fig.6)

Prior to performing the following procedure, remove the side cover and the front cover.

Remove the four screws marked E on the front of the body.

Pull out the woofer speaker toward the front and disconnect the wire (yellow and black, blue and black) from the two speaker terminals.

Removing the tweeter (See Fig.7)

Woofer

Fig.6

Prior to performing the following procedure, remove the side cover and the front cover.

Remove the two screws marked F attaching the tweeter speaker on the back of the front cover.

Removing the center (See Fig.8, 9)

Remove the front net from the four holder that are fixing the front net.

Pull out the front net toward the front while disengaging the four joints marked b.

Remove the four screws marked G on the front of the body.

Pull out the center speaker toward the front and disconnect the wire (black and black with white line) from the speaker terminals.

Front cover

Joints b

Tweeter

Fig.7

Front net

Joints b

Fig.8

Front cover

1-16

Note:

When it is hard to remove the front net, insert a minus driver, etc. in the place between the front net and the front cover as shown in Fig.8 before removing the front cover. Exercise care not to damage the main body and the front cover when inserting the minus driver. For this purpose, insert the minus driver together with cloth and the like.

Holder

Center

Fig.9

DVD Changer Mechanism

Removing the DVD Servo control board (See Fig.1)

Remove the metal cover.

Remove the DVD changer mechanism assembly.

From bottom side the DVD changer mechanism assembly, remove the one screw 1 retaining the DVD servo control board. Disconnect the card wire, from the connector CN101,

4. on the DVD servo control board.

Disengage the two engagements "A", remove the DVD

5. servo control board.

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

MX-DVB9

DVD servo control board

CN101

Remove the front panel assembly.

1. Remove the DVD changer mechanism assembly.

2. Remove the DVD servo control board.

3. Remove the screw 2 retaining the disc stopper.

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

5. (See Fig.3) From the T. bracket section and clamper base section

6. "B", remove the edges fixing the rod. (See Fig.2) Remove the screw 4 retaining the clamper assembly.

7. (See Fig.3) From the blacket section "C", remove the clamper ass'y.

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

9. the one screw 5 retaining both of the return spring and lock lever. (See Fig. 4) By removing the pawl at the section "D" fixing the return

10. spring, dismount the return spring. (See Fig.4) Remove the three lock levers. (See Fig.4)

11.

Disc stopper

T. Bracket

Fig.1

Clamper base

Rod

T. Bracket

Fig.2

Clamper ass'y

Fig.3

Rod stopper (C/J version only)

Return spring

Lock lever

Fig.4

1-17

MX-DVB9

11.

Check whether the lifter unit stopper has been caught into the hole at the section "E" of DVD 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 DVD Traverse 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 DVD tray assembly (See Fig.8). Pull out all of the three stages of DVD tray assembly in the arrow direction "F" until these stages stop (See Fig.6). At the position where the DVD tray assembly has stop end, pull out the DVD tray assembly while pressing the two pawls "G and G' " on the back side of DVD 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 DVD tray assembly.

Stopper

DVD tray assembly

Fig.5

Refer to Fig.7

Pulley gear

Pawl

DVD tray assembly

Drive unit of elevator

Fig.7Fig.6

DVD tray assembly

1-18

Motor pulley

Fig.8

Pawl ,

Fig.9

MX-DVB9

Removing the DVD 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 DVD mechanism assembly to the position shown in Fig.10. Remove the four screw 6 retaining the DVD mechanism assembly.

Removing the DVD mechanism (See Fig.11, 12 )

For dismounting only the DVD mechanism without removing the DVD mechanism assembly, align the shaft "J" of the DVD mechanism assembly to the position shown Fig.11 while turning the cam R1 and R2 assembly in the arrow direction "K" . By raising the DVD mechanism assembly in the arrow

2. direction "L" , remove the assembly from the lifter unit (See Fig.12).

Cam R1, R2 assembly

Cams R1, R2 assembly

Arrow

DVD mechanism assembly

Fig.10

DVD mechanism

Arrow

Lifter unit

Fig.11

Fig.12

Arrow

1-19

MX-DVB9

Removing the actuator motor board (See Fig.14, 15)

Absorb the four soldered positions "M" of the right and

1. left motors with a soldering absorber (See Fig.14). Remove the two screws 7 retaining the actuator motor

2. board (See Fig.14). Remove the two screws 8 retaining the tray select

3. switch board (See Fig.15).

Removing the cam unit (See Fig.15~18 )

Remove the DVD mechanism assembly.

While turning the cam gear L, align the pawl "N" position of the drive unit to the notch position (Fig.15) on the cam gear L. Pull out the drive unit and cylinder gear (See Fig.17).

3. While turning the cam gear L, align the pawl "O"

4. position of the select lever to the notch position (Fig.18) on the cam gear L. Remove the four screws 9 retaining the cam unit (cam

5. gear L and cams R1/R2 assembly) (See Fig.18).

Chassis assembly

Drive unit

Motor L

Actuator motor board

Fig.14

Motor R

Cam gear L

CN801

Fig.15

CN802

Drive unit

Tray select switch board

Cylinder gear

CN804

Cam gear L

Fig.16

Cams R1, R2 assembly

Cam unit

1-20

Select lever

Fig.18

Fig.17

MX-DVB9

Removing the actuator motor and belt (See Fig.19~22)

Remove the two screws 10 retaining the gear bracket (See Fig.19).

While pressing the pawl "P" fixing the gear bracket in the arrow direction, remove the gear bracket (See Fig.19). From the notch "Q section" on the chassis assembly

3. fixing the edge of gear bracket, remove and take out the gear bracket (See Fig. 20). Remove the belts respectively from the right and left

4. actuator motor pulleys and pulley gears (See Fig. 19). After turning over the chassis assembly, remove the

5. actuator motor while spreading the four pawls "R" fixing the right and left actuator motors in the arrow direction (See Fig. 21).

[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. 22.

Pulley gear

Gear bracket

Belt

Motor pulley

Fig.19

Actuator motor

Pulley gear Belt Motor pulley

Pawl

Chassis assembly

Gear bracket

Fig.20

Assembly and Configuration Diagram

Pulley gear

Fig.21

Pulley gear

Gear B

Cylinder gear

Gear B

Gear C

Select gear

Gross gear L

Fig.22

Gross gear U

Gear C

1-21

MX-DVB9

Removing the cams R1/R2 assembly and cam gear L (See Fig.23)

Remove the slit washer fixing the cams R1 and R2 assembly.

By removing the two pawls "S" fixing the cam R1, separate R2 from R1. Remove the slit washer fixing the cam gear L.

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

Removing the C.G. base assembly (See Fig.23, 24)

Remove the three screws 11 retaining the C.G. base assembly.

[Caution]

To re-assemble 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 "N" on the drive unit to that of the notch on the cam gear L. Then, make sure that the gear unit is engaged by turning the cam gear L (See Fig. 24).

Slit washer

Cam gear L

Slit washer Cam R2

Pawl

Cam R1

Cam switch board

C.G. base assembly

Pawl

Notch

Pawl

Cylinder gear

Drive unit

Fig.23

Cam gear L

Cam R1, R2 assembly

Gear unit

Gear bracket

Fig.24

1-22

MX-DVB9

< Cassette Mechanism Section >

Removing the Playback, Recording and Eraser Heads (See Fig.1~3)

1. While shifting the trigger arms seen on the right side of the head mount in the arrow direction, turn the flywheel R in counterclockwise direction until the head mount has gone out with a click (See Fig. 1).

2. When the flywheel R is rotated in counterclockwise direction, the playback head will be turned in counterclockwise direction from the position in Fig. 2 to that in Fig. 3.

3. At this position, disconnect the flexible P.C. board (outgoing from the playback head) from the connector CN301 on the head amp. and mechanism control P.C. board.

4. After dismounting the FPC holder, remove the flexible P.C. board.

5. Remove the flexible P.C. board from the chassis base.

6. Remove the spring "a" from behind the playback head.

7. Loosen the reversing azimuth screw retaining the playback head.

8. Take out the playback head from the front of the head mount.

9. The recording and eraser heads should also be removed similarly according to Steps 1~8 above.

Reassembling the Playback, Recording

and Eraser Heads (See Fig.2,3)

Cassette mechanism

Fig. 1

Playback/Recording & eraser head

Flexible P.C. board

CN301

Head amplifier & mechanism control P.C. board

Fig. 2

Flywheel R

Trigger armHead mount

(Mechanism A side)

Spring "a"

Trigger arm

Flywheel R

(Mechanism A side)

1. Reassemble the playback head from the front of the head mount to the position as shown in Fig. 3.

2. Fix the reversing azimuth screw.

3. Set the spring a from behind the playback head.

4. Attach the flexible P.C. board to the chassis base, and fix it with the FPC holder as shown in Fig. 3.

5. The recording and eraser heads should also be reassembled similarly according to steps 1~4 above.

Playback head

Spring "a"

FPC holder

Fig. 3

Reversing azimuth screw

Head mount

Flexible P.C. board

CN302

Head amplifier & mechanism control P.C. board

(Mechanism B side)

1-23

MX-DVB9

Removing the Head Amplifier. and Mechanism Control P.C. Board (See Fig. 4)

1. Remove the cassette mechanism assembly.

2. After turning over the cassette mechanism assembly, remove the five screws "A" retaining the head amp. and mechanism control P.C. board

3. Disconnect the connectors CN303 and CN304 on the P.C. board and the connectors CN1 on both the right and left side reel pulse P.C. boards.

4. When necessary, remove the 4 pin parallel wire soldered to the main motor.

Removing the Capstan Motor Assembly (See Fig. 5 to 7)

1. Remove the six screws "B" retaining capstan motor assembly (See Fig. 5).

2. While raising the capstan motor, remove the capstan belts A and B respectively from the motor pulley (See Fig. 6).

Flexible board

Head amplifier & mechanism control board

CN304

CN302 CN301

Flexible board

CN303

Fig. 4

Capstan motor assembly

Caution 1: Be sure to handle the capstan belts so carefully that these belts will not be stained by grease and other foreign matter. Moreover, these belts should be hand while referring to the capstan belt hanging method.

Capstan belt A

Capstan belt B

Capstan belt A

BBBB

Fig. 5

Capstan motor

Capstan belt B

Motor pulley

1-24

Fig. 7 Fig. 6

MX-DVB9

Removing the Capstan Motor (See Fig. 8)

From the joint bracket, remove the two screws "C" retaining the capstan motor.

Removing the Flywheel (See Fig. 9,10)

1. Remove the head amp. and mechanism control P.C. Board.

2. Remove the capstan motor assembly.

3. After turning over the cassette mechanism, remove the slit washers "a" and "b" fixing the capstan shafts R and L, and pull out the flywheels R and L respectively from behind the cassette mechanism.

Flywheel R

Fig. 8

Capstan motor

Joint bracket

Flywheel L

Flywheel R

Flywheel L

Fig. 10

Removing the Reel Pulse P.C. Board and Solenoid (See Fig. 11)

1. Remove the five pawls (c, d, e, f, g) retaining the reel pulse P.C. board.

2. From the surface of the reel pulse P.C. board parts, remove the two pawls "h" and "i" retaining the solenoid.

Solenoid

Slit washer "a"

Fig. 9

Slit washer "b"

Reel pulse board

Solenoid

Fig. 11

1-25

MX-DVB9

Adjustment method

Measurement instruments required for adjustment

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

2. Attenuator impedance : 600 ohm

3. Electronic voltmeter

4. Frequency counter

5. Wow flutter meter

6. Test tape VT712 : For Tape speed and wow flutter ( 3kHz) VT724 : For Reference level (1kHz) VT703L : For Head angle (10kHz)

In case of using 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

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

9. Test disc : VT-501(12cm)

10. Jitter meter

Measurement conditions

Power supply voltage AC110/127/230-240V(50Hz)

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

Radio input signal

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

Frequency Range

AM 531kHz~1602kHz (9kHz step) 530kHz~1600kHz (10kHz step) FM 87.5MHz~108MHz

Standard measurement positions of volume and switch

Power : Standby (Light STANDBY Indicator) Sub woofer VOL. : Minimum Sound mode : OFF Main VOL. : 0 Minimum Traverse mecha set position : Disc 1 Mic MIX VOL : MAX ECHO : OFF

Precautions for measurement

1. Apply 30pF and 33k ohm 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 not BTL system.

1-26

Arrangement of adjusting positions

MX-DVB9

Cassette mechanism section (Mechanism A section)

Head azimuth

adjusting screw

(Forward side)

Playback

head

Head azimuth

adjusting screw

(Reverse side)

Cassette mechanism section (Back side)

Head azimuth

adjusting screw

(Forward side)

Playback, recording and eraser

heads or playback head

Head azimuth

adjusting screw

(Reverse side)

Cassette Mechanism Unit Section

Tape speed ADJ

Bias ADJ L

Bias ADJ R

1-27

MX-DVB9

Tape recorder section

Items Measurement

Confirmation of head angle

Confirmation of tape speed

conditions

Test tape :VT703L (10kHz) Measurement output terminal :Speaker terminal Speaker R (Load resistor :6 ) :Headphone terminal

Test tape :VT712 (3kHz)

Measurement output terminal :Headphone terminal

1. Playback the test tape VT703L (10kHz).

2. With the playback mechanism or recording & playback mechanism, adjust the head azimuth screw so that the forward and reverse output levels become maximum. After adjustment, lock the head azimuth at least by half a turn.

3. In either case, this adjustment should be performed in both the forward and reverse directions with the head azimuth screw.

<Constant speed> Adjust VR301 so that the frequency counter reading becomes 3,000Hz 60Hz when playing back the test tape VT712 (3kHz) with the playback mechanism or playback and recording mechanism after ending forward winding of the tape.

Reference values for confirmation items

Items Measurement

Difference between the forward and reverse speed. P. mecha and R/P mecha speed

conditions

Test tape :VT703L(10kHz) Measurement output terminal :Speaker terminal Speaker R (Load resistance :6 ) measurement output terminal :Headphone terminal

When the test tape VT712 (3kHz) has been played back with the playback mechanism or recording and playback mechanism at the beginning of forward winding, the frequency counter reading of the difference between both of the mechanisms should be 6.0Hz or less.

Measurement method

Standard

values

Maximum output

Tape speed of decks (A and B) :3,000Hz 60Hz

Standard

values 60Hz or less

Adjusting

positions

Adjust the head azimuth screw only when the head has been changed.

VR301

Adjusting

positions

Both the playback and recording & playback mechanism

Wow & flutter

1-28

Test tape :VT712(3kHz) Measurement output terminal :Headphone terminal

When the test tape VT712(3kHz) has been played back with the playback mechanism or recording and playback mechanism at the beginning of forward winding the frequency counter reading of wow & flutter should be 0.25% or less (WRMS).

with in

0.25% JIS (WTD)

Both the playback and recording & playback mechanism

Electrical performance

Items Measurement

Adjustment of recording bias current (Reference value)

conditions *Mode : Forward or reverse mode *Recording mode *Test tape : AC-225 Measurement output terminal :Both recording and headphone terminals

Measurement method

1. With the recording and playback mechanism, load the test tapes (AC-225 to TYP ), and set the mechanism to the recording and pausing conditions in advance.

2. After connecting 100 in series to the recorder head, measure the bias current with a valve voltmeter at both of the terminals.

3. After resetting the [PAUSE] mode, start recording. At this time, adjust VR101 for LcH and VR201 for RcH so that the recording bias current values become 4.0 A (TYP ).

Standard

values AC-225 :4.20 A

MX-DVB9

Adjusting positions

LcH :VR101 RcH :VR201

Adjustment of recording and playback frequency characteristics

Reference frequency :1kHz and 10kHz (REF:-20dB) Test tape :TYP AC-225 Measurement input terminal :OSC IN

1. With the recording and playback mechanism, load the test tape (AC-225 to TYP ), and set the mechanism to the recording and pausing condition in advance.

2. While repetitively inputting the reference frequency signal of 1kHz and 10kHz from OSC IN, record and playback the test tape.

3. While recording and playing back the test tape in TYP , adjust VR101 for LcH and VR201 for RcH so that the output deviation between 1kHz and 10kHz becomes -1dB 2dB.

Reference values for electrical function confirmation items

Items Measurement

Recording bias frequency

conditions

*Recording and playback side forward or reverse *Test tape :TYP AC-225 *Measurement terminal BIAS TP on P.C. board

1. With the recording and playback mechanism. load the test tape (AC-225 to TYP ), and set the mechanism to the recording and pausing conditions in advance.

2. Confirm that the BIAS TP frequency on the P.C. board is 100kHz 6kHz.

Measurement method

Output deviation between 1kHz and 10kH :-1dB 2dB

Standard

values 100kHz +9kHz

-7kHz

LcH :VR101 RcH :VR201

Adjusting positions

Eraser current (Reference value)

*Recording and playback side forward or reverse *Recording mode *Test tape :AC-225 Measurement terminal Both of the eraser head

1. With the recording and playback mechanism, load the test tapes (AC-225 to TYP ), and set the mechanism to the recording and pausing condition in advance.

2. After setting to the recording conditions, connect 1M in series to the eraser head on the recording and playback mechanism side, and measure the eraser current from both of the eraser terminal.

TYP :75mA

1-29

MX-DVB9

DVD section

TEST MODE FOR DVD and to INITIALISE THE DVD UNIT BOARD

a) Insert A/C Power Cord

b) At standby mode press Stop Button and CANCEL/DEMO button.

Wait 4 seconds for the display of " TEST VERSION REGION " i.e. TEST JC 1

c) Press the 'ENTER' button on remocon. The FL panel will display 'EEPROM'.

Plug out and plug in again the power cord. Repeat the process 1(a) and 1(b) again.

Confirm that the Area Code and Region Code is correctly display as below.

Area Code FL indicate of Area Code in Test mode

J/C

UG/UX

US/UN/UP

E/EN/B

2U 3U

Region Code.

3 3

4 5

Note: Please plug out and plug in the power cord from A/C supply before continue the next test. Adjustment Jig set up

Remove the rubber cushion from each of the four corners of the traverse mechanism. (When installing be sure not to make a mistake with the cushion colors).

Install the jig stud.

Make a jig clamp (Remove the clamp from the set and assemble it as shown in the diagram below).

Note:

How to handle the pickup To protect the pickup from electro-static damage, make sure to hold it by the die-cast chassis (optical base). And make sure that pickup lens do not touch the top cover.

Jig stud

Green rubber cushion

Installing the 4 jig studs

Blue rubber cushion

1-30

How to prepare a clamp

Remove the claws from the 3 locations

Disassemble the clamp and holder

Combine the clamp and holder to become a jig clamp.

+ 99 hidden pages

JVC MX-DVB9 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preventing static electricity

Precautions for service

Important for laser products

Disassembly method

Adjustment method