JVC NXCDR-7-R Service manual

SERVICE MANUAL

COMPACT COMPONENT CDR SYSTEM

NX-CDR7R

Area suffix B ------------------------------- U.K.

E ----------- Continental Europe EN ------------ Northern Europe

NX-CDR7R

SP-NXCDR7

Contents

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

CA-NXCDR7R

1-2 1-3 1-4 1-5 1-29 1-30

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

SP-NXCDR7

1-32 1-33 1-33 1-34~50

No.21030 Oct. 2001

NX-CDR7R

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 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 each exposed 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.

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. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the J and C version)

1-2

NX-CDR7R

Preventing 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.

1.1. Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed.

1.1.1. Ground the workbench

1. 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.

1.1.2. Ground yourself

1. 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

1.1.3. 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 next page.)

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.

1.2. 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. For specific details, refer to the replacement procedure in the text. 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

NX-CDR7R

Important for Laser Products

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

CLASS 1 LASER PRODUCT

1-4

NX-CDR7R

Disassembly method

Removing the metal cover

(See Fig.1 and 2)

Remove the four screws A on the back of the body.

Remove the screw B on each side of the body.

Remove the rear part of the metal cover upward while pulling the lower part of both sides.

Metal cover

Fig.1

Metal cover

B 2

Fig.2

1-5

NX-CDR7R

Removing the front panel assembly

(See Fig.3 to 6)

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

Disconnect the card wire from connector CN705, CN708, CN704 and CN712 on the main board.

Disconnect the wire from connector CN905 on the power board.

Remove the two screws C on each side of the body.

Remove the two screws D on the bottom of the body.

Disengage the joint a on the bottom and the two joints b on the lower side of the body using a screwdriver. Then remove the front panel assembly toward the front.

Front panel assembly

CN704

Fig.3

CN712

Main board

CN705

CN708

Main board

Power board

CN905

Front panel assembly

Joint a

Joint b

Main board

CN708

Fig.4

Fig.5Fig.6

CN705

Front panel assembly

Joint b

1-6

NX-CDR7R

Removing the main board

(See Fig.7 and 8)

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

Disconnect the card wire from connector CN704, CN705, CN706, CN707, CN708, CN709 and CN712 on the main board on the upper side of body.

Remove the two screws E on the upper side of the body.

Disconnect connector CN701, CN702, CN703, CN710, CN711 on the main board from other boards respectively.

Front panel assembly

CN706

CN707

Main board

CN701

Front panel assembly

CN704

CN712

CN705

CN708

CN709

CN711

CN710

CN702

CN703

Fig.7

Main board

CN711

CN710

CN706

CN707

CN702

CN703

CN701

Fig.8

1-7

NX-CDR7R

Removing the rear cover / rear panel

(See Fig.9 to 12)

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

Remove the four screws F on the back of the body, and press the two joints c inward to release.

Remove the thirteen screws G attaching the rear panel.

Disengage the two joints d in the lower part of the rear panel using a screwdriver.

Joint c

Rear cover

Fig.9

Rear panel

Fig.10

Rear panel

1-8

Joint d

Fig.11Fig.12

Removing the tuner board (See Fig.13)

Prior to performing the following procedure, remove the metal cover, the main board and the rear panel.

Disconnect the wire from connector CN802 on the tuner board on the right side of the body.

Remove the screw H attaching the tuner board.

Move the tuner board upward and outward to disengage the tuner board from the base chassis at the joint f, and from the power board at the joint e.

NX-CDR7R

Joint e

Removing the power board

(See Fig.14 and 15)

Prior to performing the following procedure, remove the metal cover, the main board and the rear panel.

Remove the band attaching the wire to the power board on the back of the body.

Disconnect the wire from connector CN901, CN904 and CN905 on the power board.

Remove the screw I on the left side of the body.

Disconnect connector CN902 and CN903 on the power board from the power board, and move the power board upward to disengage it from the base chassis at the joint g.

Tuner board

CN802

Power board

Band

CN904

CN901

Joint f

Fig.13

Fig.14

Power board

CN903

CN905 CN902

Tuner board

Fig.15

Band

CN904

CN901

Joint g

1-9

NX-CDR7R

Removing the power amplifier board 1 / power amplifier board 2 / heat sink

(See Fig.16 to 19)

Prior to performing the following procedure, remove the metal cover, the main board, the rear panel and the tuner board.

Disconnect the wire from connector CN403 on the power amplifier board 2.

As the wire extending from the fan, take it off the notch h in the lower part of the power amplifier board 2.

Disconnect connector CN101 and CN103 on the power amplifier board 1, and CN402 and CN405 on the power amplifier board 2 from the power board respectively. The heat sink is still attached to the power amplifier board 1 and the power amplifier board 2.

Remove the two screws J attaching the IC bracket (1) on the back of the heat sink, and remove the power amplifier 1.

Power amplifier board 2

Power amplifier board 1

CN101

Heat sink

CN103

CN403

Fig.16

Power amplifier board 2

Power board

Power amplifier board 2

CN402

CN405

Remove the three screws K attaching the IC bracket (2) on the back of the heat sink, and remove the power amplifier 2.

Power amplifier board 2

Power amplifier board 1

Heat sink

Fig.17

IC bracket (1)

Notch h

Power amplifier board 1

1-10

IC bracket (2)

Power amplifier board 2

Fig.18Fig.19

Removing the fan (See Fig.20)

Prior to performing the following procedure, remove the metal cover, the main board, the rear panel, the tuner board, the power amplifier board 1, the power amplifier board 2 and the heat sink.

NX-CDR7R

Fan

REFERENCE:

Disconnect the wire from connector CN210 on the power board.

Remove the two screws L attaching the fan.

Push down the clamp which settles the wire extending from the power transformer, in the direction of the arrow, and remove the fan backward.

The fan is detachable without removing the CDR mechanism assembly.

Removing the power board (See Fig.21)

Prior to performing the following procedure, remove the metal cover, the main board, the rear panel, the tuner board, the power amplifier board 1, the power amplifier board 2 and the heat sink.

Disconnect the wire from connector CN203 and CN210 on the power board on the back of the body.

Power board

CN204

Clamp

Fig.20

CN207

Power board

CN210

Power board

CN203

Remove the two screws M attaching the power board.

Disconnect connector CN204 and CN207 on the power board from the power board.

CN210

Fig.21

1-11

NX-CDR7R

Removing the CDR mechanism cover / CDR mechanism assembly

(See Fig.22 to 27)

Prior to performing the following procedure, remove the metal cover, the front panel assembly, the rear panel, the main board and the tuner board.

REFERENCE:

Remove the spacer settling the card wire on the right side of the body and release the wire from the clamp and the notch i of the power board on the upper side of the body. Disconnect the card wire from connector CN702 and CN703 on the CDR connection board.

Disconnect the wire from connector CN507 on the CD servo board.

When removing the CDR mechanism assembly only, refer to the next section.

When removing the fan only, refer to “Removing the fan”.

Clamp

CDR mechanism cover

CDR connection board

CN703

Notch i

CDR connection board

CN702

CD servo board

CN507

Fig.22

CDR mechanism cover

Disconnect the wire from connector CN210 on the power board on the back of the body and release the wire from the notch h of the power amplifier board 2.

Remove the four screws N on the upper front side of the body and remove the CDR mechanism cover toward the front. The CDR mechanism assembly and the fan are also removed with the CDR mechanism cover.

Clamp

Notch i

Fig.23

Power amplifier board 2

1-12

Notch h

Fig.24

Remove the three screws O attaching the CDR mechanism cover. Move the CDR mechanism assembly in the direction of the arrow, inside of the CDR mechanism cover, to disengage it from the three joint bosses marked j. Then remove the CDR mechanism assembly toward the front.

NX-CDR7R

CAUTION:

When reassembling, set the wire extending from the rear of the CDR mechanism board on the side of the CDR mechanism cover (marked k) as shown in Fig.26 before reattaching the CDR mechanism assembly.

Joint bosses j

Fan

Fig.25

CDR mechanism cover

Joint bosses j

Fig.26

Joint bosses j

Fig.27

1-13

NX-CDR7R

Removing the CDR mechanism assembly only (See Fig.28 and 29)

REFERENCE:

Prior to performing the following procedure, remove the metal cover, the front panel assembly and the main board.

Disconnect the card wire from connector CN702 and CN703 on the CDR connection board on the right side of the body.

Disconnect the wire from connector CN507 on the CD servo board.

Remove the three screws O on the upper side of the body.

Move the CDR mechanism assembly in the direction of the arrow, inside of the CDR mechanism cover, to disengage it from the three joint bosses marked j. Then pull out the CDR mechanism assembly toward the front (See Fig. 25 to 27).

The CDR mechanism assembly is detachable without removing the CDR mechanism cover.

CDR connection board

CDR mechanism assembly

CDR mechanism cover

Fig.28

CN703

CN702

CAUTION:

When reassembling, set the wire extending from the back of the CDR mechanism board on the side of the CDR mechanism cover (marked k) as shown in Fig.26 before reattaching the CDR mechanism assembly.

Removing the CD servo board

(See Fig.30)

Prior to performing the following procedure, remove the metal cover, the front panel assembly, the main board, the rear panel, the tuner

mechanism cover.

Disconnect the card wire from connector CN504 and

1. CN505 on the CD servo

the body. Disconnect the wire from connector CN403 on the

board.

power Remove the two screws P and move the CD servo

board in the direction of the arrow to release the two joints l.

board on the

board and the CDR

upper side of

Joint bosses j 3

CN504

CN505

CD servo board

CN507

Fig.29

Joints l

CD servo board

Fig.30

1-14

NX-CDR7R

Removing the CD changer mechanism assembly (See Fig.31 to 33)

REFERENCE:

Prior to performing the following procedure, remove the metal cover, the front panel assembly and the main board.

Disconnect the card wire from connector CN606, CN608, CN651 on the CD changer mechanism board on the right side of the body.

Remove the four screws Q attaching the CD changer mechanism assembly on the upper side of the body.

3. Move the CD changer mechanism assembly in the direction of the arrow, inside of the CD changer mechanism cover, and pull out it toward the front while raising it slightly.

The CD changer mechanism assembly is detachable without removing the CDR mechanism cover and the CDR mechanism assembly.

CDR mechanism assembly

CD changer mechanism assembly

CD changer mechanism board

CN606

CN651

Fig.31

CN608

Fig.32

Fig.33

CDR mechanism assembly

CD changer mechanism assembly

1-15

NX-CDR7R

Removing the power transformer assembly (See Fig.34 and 35)

Prior to performing the following procedure, remove the metal cover, the main board, the rear panel, the tuner board, the power amplifier board 1, the power board and the heat sink.

Remove the band setling the wire on the power board on the back of the body and disconnect the wire from connector CN904.

Disconnect the wire from connector CN203 on the power board.

Remove the four screws R on the upper side of the body, and remove the power transformer assembly from under the heat sink backward.

Band

Power board

CN904

Power board

CN203

Power transformer assembly

Fig.34

Power board

Power transformer assembly

Fig.35

Power board

CN203

1-16

NX-CDR7R

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

Removing the LCD board (See Fig.36)

Remove the four screws S on the back of the front panel assembly.

Removing the function switch board

(See Fig.37)

Remove the seven screws T.

Disconnect the card wire from connector CN671 and CN672 on the function switch board.

CAUTION:

When reconnecting each card wire, let it through the three notches m of the as shown in Fig.37.

Function switch board

Phone jack board

LCD board

Motor board

Fig.36

Removing the phone jack board

(See Fig.38)

Remove the screw U attaching the presser board of the phone jack board.

Remove the screw V attaching the earth terminal extending from the phone jack board.

Removing the motor board (See Fig.39)

Disconnect the wire from connector CN582 on the OPEN / CLOSE SW detect board.

Disconnect the wire from connector CN583 on the motor board.

Remove the screw W.

Removing the OPEN / CLOSE SW detect board (See Fig.39)

Disconnect the wire from connector CN582 on the OPEN / CLOSE SW detect board.

Function switch board

Phone jack board

Notches m

Fig.37

Fig.38

Presser board

Remove the two screws X.

Motor board

CN583

OPEN / CLOSE SW detect board

CN582

Fig.39

1-17

NX-CDR7R

Removing the door motor

(See Fig.40 and 41)

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

Remove the belt from the door motor.

Remove the screw Y attaching the door motor bracket.

Remove the two screws Z.

Door motor

Door motor bracket

Door motor

Belt

Fig.40

Door motor bracket

Fig.41

1-18

Removing the control board

(See Fig.42 to 46)

Prior to performing the following procedure, remove the function switch board, the motor board and the belt.

Remove the belt. Rotate the pulley (1) and move the control panel assembly toward the front until it stops.

Remove the control panel assembly toward the front while pulling out the two shafts of the joint l on the right and left sides of the control panel assembly.

NX-CDR7R

CAUTION:

Put the front panel assembly down toward the front, and release the four joint m and n inside of the control panel by pressing them inward.

Remove the four screws Z' attaching the control board.

Joint m

Joint n

Each shaft of the joint l is attached a collar. Be careful not to lose that.

Arm bracket

Fig.45

Control board

Pulley (1)

Fig.42

Joint l

Joint m

Joint n

Control panel assembly

Fig.43

Control board

Fig.46

Z'Z'

Control panel assembly

Collar

Fig.44

1-19

NX-CDR7R

Removing the servo control board

(See Fig.1 to 4)

ATTENTION:

Insert a screwdriver into the sub chassis slot on the back of the body and push the slider (R) toward the front.

From the top of the body, slide the hook and the slider (R) forward until they stop.

From the right side of the body, slide the slide cam (L) backward until it stops. The sub chassis unit will move to the lowest position.

From the bottom of the body, unsolder each soldered part a and b of the motors on the servo control board.

Remove the five screws A attaching the servo control board.

Disconnect connector CN610 on the servo control board from the tray select switch board to suspend the servo control board tentatively. Solder the part c of the flexible wire connected to connector CN601 on the underside of the servo control board.

Make sure the sub chassis unit is locating at the lowest position. If not,perform the following procedure from 1 to 3.

Slot

Sub chassis unit

Hook

Tray select switch board

CN610

Slide cam (L)

Fig.1

Slider (R)

Slide cam (L)

Fig.2

Cam switch

Disconnect the flexible wire from connector CN601 and remove the servo control board from the body.

ATTENTION:

Control cam

Slot p

1-20

In case of disconnecting the flexible wire without soldering, the CD pick up may be damaged.

When reassembling, make sure the cam switch boss of the servo control board is fitted to the slot p of the control cam on the bottom of the body (Refer to Fig.3-1).

Cam switch boss

Gear base unit

Main board

Solder part a

Solder part b

Solder part c

CN601

Servo control board

Fig.3-1

Servo control board

Fig.4Fig.3-2

NX-CDR7R

Removing the tray unit (See Fig.5 to 8)

The tray unit can be removed despite the position of the sub chassis unit, but the lowest position is recommended to expedite the work.

Remove the four screws B attaching the top cover on the top of the body.

Remove the top cover with the two rods attached to the top cover and the clamper base unit.

Pull the lock lever of the return spring on the right side of the body to eject the tray unit.

From the top of the body, release the tray from the joint hook marked d (Push the tray toward the front).

Release the stoppers on both sides in the direction of the arrow and pull out the tray unit from the body.

ATTENTION:

Pull out the tray unit from the top tray 3 in sequence.

Top cover

Rod

Clamper base unit

Fig.5

Top cover

Both

Joint d

Tray

Tray unit

Tray

Both

Rod

Clamper base unit

Fig.6

Tray unit

Tray 3

Hook

Tray

Hook

Tray

Fig.8

Return spring

Lock lever

Fig.7

1-21

NX-CDR7R

Removing the side unit (L) and (R)

(See Fig.9-1 to 9-5)

Prior to performing the following procedures, remove the servo control board, the top cover and the tray unit.

Remove the two screws C attaching the side unit (L).

Slide and remove the side unit (L) toward the front while releasing the two joints e and the joint f with the chassis unit.

Slide the slide cam (L) toward the front until it stops to place the sub chassis unit at the top position.

ATTENTION:

Turn the hook gear counterclockwise to move the slide hook and the slider (R) backward until they stop.

Remove the three screws D attaching the side unit (R). Raise the side unit (R) upward and release the joint g with the chassis unit and the boss from the select arm marked h. Then remove the side unit (R) from the body.

The side unit (R) can be removed when the sub chassis unit is located at the top position.

Side unit (R)

Hook gear

Joint g

slide hook

Slider (R)

Side unit (L)

Joint h

Select arm

Fig.9-1

Joints e

Side unit (L)

Joint f

Slide cam(L)

ATTENTION:

Side unit (R)

When reassembling, make sure the boss is fitted to the select arm marked h.

Boss

Select arm

Side unit (L)

Joint f

Side unit (R)

Joints e

Fig.9-2

Fig.9-3

Joint g

1-22

Joint h

Fig.9-5Fig.9-4

Removing the sub chassis unit

(See Fig.10 to 12)

Prior to performing the following procedures, remove the servo control board, the top cover, the tray unit, the side unit (L) and the side unit (R).

Turn the hook gear counterclockwise to move the slide hook and the slider (R) backward until they stop.

Slide the slide cam (L) and the slide cam (R) in the direction of the arrow until they stop.

(The notches of each slide cam are fitted to the pins on both sides of the sub chassis unit.)

Detach the sub chassis unit upward. ATTENTION:

When reassembling, turn the hook gear of the chassis unit counterclockwise until it stops and slide the slide hook and the slider (R) of the sub chassis unit backward until they stop.

NX-CDR7R

Slide cam (L)

Slide cam (R)

Sub chassis unit

Fig.10

Sub chassis unit

Slider (R)

slide hook

Slide cam (L)

Notch

Fig.11

Hook gear

Fig.12

1-23

NX-CDR7R

Removing the flap base unit and the gear base unit (See Fig.13 and 14)

Prior to performing the following procedures, remove the servo control board, the top cover, the tray unit, the side unit (L) and the side unit (R).

Remove the screw E attaching the flap base unit. Release the joint tabs i and j, then remove the flap base unit from the body.

Remove the belts from the two pulleys on the gear base unit.

Remove the three screws F and remove the gear base unit from the body.

Joint tab j

Flap base unit

Joint tab i

Fig.13

Gear base unit

Removing the motors (See Fig.15)

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

Remove the belts from the two pulleys.

Remove the four screws G and detach each motor from the body.

Belt

Fig.14

Motor

1-24

Motor

Fig.15

NX-CDR7R

Removing the pickup (See Fig.16 to 20)

From the top of the body, remove the three screws H attaching the clamper base unit.

Remove the clamper base unit with the two rods attached to the clamper base unit and the top cover.

Turn the screw shaft gear marked k in the direction of the arrow to move the pickup unit.

Remove the screw I attaching the shaft holder.

Move the screw shaft in the direction of the arrow and release it from the joint l. Then release it from the joint m with the pickup holder. Detach the pickup with the screw shaft.

Solder the part n of the flexible board on the underside of the pickup. After soldering, disconnect the flexible wire connected to the pickup (In case of disconnecting the flexible wire without soldering, it may cause damage to the CD pickup).

Remove the two screws J attaching the rack arm to the pickup unit.

Fig.16

Clamper base

Top cover

Rod

Clamper base unit

Pull out the screw shaft from the pickup.

Part n (soldering)

Fig.19

Rack arm

Flexible board

Shaft holder

Fig.17

Rods

Top cover

Joint m

Screw shaft

Fig.20

Pickup

Joint l

Fig.18

1-25

NX-CDR7R

Removing the traverse mechanism assembly (See Fig.21)

Prior to performing the following procedure, remove the servo control board and the clamper base unit.

Remove the three screws K attaching the traverse mechanism assembly.

Detach the rear part of the traverse mechanism assembly upward to release the joint o with the sub chassis unit. Then remove the assembly from the body.

Removing the feed motor (See Fig.22)

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

Remove the screw L attaching the feed motor.

Traverse mechanism assembly

Fig.21

Joint o

Feed motor

Removing the tray select switch board

(See Fig.5,6 and 23)

Remove the four screws B attaching the top cover on the top of the body.

Remove the top cover with the two rods attached to the top cover and the clamper base unit.

Remove the screw M on the right side of the body.

Top cover

Rod

Fig.22

Top cover

Fig.5

Tray select switch board

Clamper base unit

1-26

Clamper base unit

Fig.6

Rod

Fig.23

CN620

NX-CDR7R

Disassembly method

Removing the tweeter speaker

(See Fig.1 to 5)

Release the four bosses of the joint a and remove the front grill toward the front.

Turn over the body and insert a slotted screwdriver into the two holes b of the front panel assembly. Then release the four joint bosses c and remove the front panel assembly toward the front.

CAUTION:

Disconnect the two wires from the tweeter speaker terminal on the back of the front panel assembly.

Remove the two screws A attaching the tweeter speaker.

To prevent damage to the product, apply a cloth to the box assembly.

Joints a

Front grill

Joints a

Fig.1

Joint bosses c

Hole b

(Bottom)

Fig.3

Front panel assembly

Hole b

Box assembly

Tweeter speaker

Front panel assembly

Box assembly

Joint bosses c

Fig.2

Wires

Speaker terminal

Front panel assembly

Tweeter speaker

Fig.4Fig.5

1-27

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