JVC CHX-470-RF Service manual

SERVICE MANUAL

CD CHANGER

CH-X470RF

CH-X470RF is a combination of CH-X470 and KS-RF50. KS-RF50 is a combination of Remote control and the RF unit.

Contents

Safety precaution Preventing static electricity Disassembly method Forced eject procedures

C

O

MP

A

C

T

D

IS

C

H

A

N

G

E

R

1

2

–

D

IS

CH-X470

C

KS-RF50

Area Suffix

J ------ Northern America

1-2 1-3 1-4 1-20

Trouble shooting Flow of functional operation until TOC read Description of major ICs

1-21

1-23 1-27

No.49668

Dec. 2001

CH-X470RF

Safety precaution

!

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.

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

1-2

CH-X470RF

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

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. 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 substrate.

1.Solder is put up before the card wire is removed from connector on the CD substrate as shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.)

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

Traverse mechanism PCB Ass'y

Pickup unit

Soldering

1-3

CH-X470RF

Disassembly method

Perform operations according to the items to be disassembled.

1.

After removing the exterior (top and bottom).

2.

Proceed to the pickup replacement section.

3.

When applying grease, refer to the exploded view. Use new grease.

1.

Remove the exterior (required section only).

2.

The mechanism section is designed so that each unit can be removed separately.

3.

When reassembling, refer to the assembling precautions. (Use new grease when applying grease.)

B

Bottom cover

Knob

A

B

Fig. 1

B

Bottom cover

Remove A and turn in the direction of the arrow.

BB

A

B

Knob

B

Exterior section

<

>

Removing the bottom cover and front panel assembly

(See Fig.1 to 4)

Remove the two screw A to unlock the mounting

1. direction knob located on the side of the main unit.

Turn the mounting direction knob in the direction of

2. the arrow using a coin, etc. to remove it. (The knob can be removed only when it is set to this position.)

Remove the four top cover fixing screws B at the

3. triangle marks on the side of the main unit. (Perform the same operation on both sides.)

Turn the unit upside down so the bottom surface is

4. facing upward.

Lift the rear edge of the bottom cover slightly and lift

5. the side by grasping the DIN jack section on the side panel, then turn it toward the front (raise upward) to remove the bottom cover.

Remove A and turn in the direction of the arrow

The front panel can be separated by raising the cover.

Unhook catches

Fig. 2

Fig. 3

Bottom cover

Slightly lift the jack section to remove.

Unhook the four catches located on both sides of the

6. front panel, and turn the front panel toward the top cover (lower down) to remove the front panel.

1-4

Front panel

Unhook catches

Fig. 4

Removing the top cover

(See Fig.5 to 9)

Remove the four damper bracket fixing screws C to

1. remove the damper brackets.

Pull out the dampers, being careful not to damage

2. them. When reattaching a damper, insert your finger to push out the center of the damper to mount it on the damper shaft, as shown in Fig. 6-1.

Turn the damper spring bracket toward the top at a

3. right angle as shown in Fig. 7, then push down the lower side of the damper spring bracket to lift it off.

Remove the three fixing screws D and E on the DIN

4. jack board assembly.

Damper

Damper bracket

Fig. 5

CH-X470RF

Damper

Damper bracket

C

Lift the changer unit upward.

5.

Remove the damper springs from the mechanism

6. chassis if required. To reassemble, refer to the diagram below.

Apply alcohol to the shaft then immediately attach the damper. (After attaching, check that the shaft is correctly inserted.)

Damper shaft

Damper

Fig. 6-1

Push out with your finger before attaching

Lift the changer unit upward

Damper

Damper bracket

C

Damper

C

Damper bracket

Fig. 6

Turn to the top position (at a right angle), then push down to lift off.

Damper spring bracket

Fig. 7

E

Damper spring

Silver

(mechanism side)

Fig. 8

Mechanism

Chassis

How to attach the damper springs

Fig. 8-1

Damper spring

Black

(magazine side)

Remove the flexible ribbon wire if required

DIN jack board

E

D

Fig. 9

1-5

CH-X470RF

Removing the fittings

Remove the fixing screw F.

1.

Unhook the two catches a on the top edge of the

2.

fitting, then unhook the two catches b at the left / right bottom edges.

(See Fig.10)

Removing the main PCB assembly

(See Fig.11)

Remove the power IC fixing screw G.

1.

Remove the four screws H securing the main board

2. assembly.

Disconnect position motor wire connector CN504

3. from the main board assembly.

Disconnect sensor board assembly wire connector

4. CN601 from the main board assembly.

Remove the flexible ribbon wire from CN502 on the

5. traverse mechanism board assembly. When reinstalling the board boards, refer to the reassembling procedures for protecting switches, etc.

CN502

Catches b

Catches a

Fitting

H

F

Fig. 10

CN601

H

Main board

Fig. 11

G

CN504

1-6

CH-X470RF

Sensor assembly unit

Remove the two screws I securing the sensor

1. assembly unit.

Unhook the spring on the back of the sensor

2. assembly unit from the holes on the chassis.

Magazine lock arm

Remove the magazine lock spring from the front side

1. of the chassis.

Remove the poly-washer c securing the magazine

2. lock arm.

Turn the magazine lock arm in the direction of the

3. arrow until the notch is at the d position to remove it from the chassis.

(See Fig.12)

(See Fig.12 and 13)

I

Spring

Sensor assembly

Rear

I

Fig. 12

Magazine lock spring

Positioning motor assembly

(See Fig.14)

Remove the two screws J securing the positioning

1. motor.

Slightly lift the positioning motor assembly to remove

2. it from the two burrs on the chassis.

d

Poly-washer c

Fig. 13

J

Positioning motor assembly

Fig. 14

1-7

CH-X470RF

Rear slider

Position the unit with the front section facing down.

1. Rotate the third gear located on the back of the main unit in the direction of the arrow (clockwise).

Shift the rear slider in the direction of the arrow and

2. remove it at the rear slider mounting position (at the widest hole).

Front slider

Position the unit with the rear section facing down.

1. Rotate the third gear located on the bottom of the unit in the direction of the arrow (clockwise) until the front slider is shifted to the outermost position.

Remove the E-washer securing the front slider to

2. remove the front slider from the chassis

(See Fig.15)

(See Fig.16)

Can be removed at the stud position (at the widest hole)

Shift

Third gear

Fig. 15

Fig. 16

Remove

Third gear

Remove the E-washer

Rear slider

Front slider

Top plate

Remove the nine screws K securing the top plate.

1.

Disconnect the section e attached to the rear of the

2. unit, then lift the top plate slightly.

Slide the top plate toward the rear of the unit to

3. remove the upper rod from the top plate.

(See Fig.17 and 18)

Top plate

K

Slide and remove the rod inside

Rod

K

Slide

Fig. 17

Top plate

Remove

1-8

K

After lifting

Fig. 18

e

CH-X470RF

Lifter unit

Unhook the elevator spring located on the front side

1. of the unit. (Be sure to first unhook the spring from the lifter side as shown in the upper part of the diagram.)

Lift the lifter unit upward, then remove the lower rod

2. to remove the lifter unit from the chassis.

Lifter bracket

Remove the two lifter bracket fixing screws L located

1. on the back of the lifter unit.

Remove the lower rod.

2.

(See Fig.19 and 20)

(See Fig.21)

Side bracket and traverse mechanism assembly

Remove the two side bracket unit fixing screws M to

1. disconnect the side bracket unit from the lifter unit.

(See Fig.22)

Unhook this part first

Proper orientation

Spring

Fig. 19

Lifter unit

Lift up the lifter unit

Lower rod

Remove the three shafts on the traverse mechanism

2. assembly from the lifter unit.

CAUTION:

For reassembling, refer to the reassembling procedures.

Lifter unit

M

Side bracket

Traverse mechanism assembly

Remove from the lifter unit

Fig. 20

L

Lifter bracket

L

Remove from the lifter unit

Fig. 22

Fig. 21

1-9

CH-X470RF

Removing the mechanism board / pickup assembly (See Fig.23 to 26)

Remove the three screws N fixing the mechanism

1. board on the back of the traverse mechanism.

Disconnect the two feed motor wires (blue and

2. white), two spindle motor wires (red and black) and two tray motor wires (brown and black) that are soldered to the mechanism board.

Short-circuit the grounding point on the mechanism

3. board. Move the mechanism board without disconnecting the wire from connector CN501. Solder the short circuit round on the pickup assembly.

Disconnect the wire from connector CN501 on the

4. mechanism board.

Remove the screw O to remove the feed motor

5. assembly.

Remove the screw P to remove the shaft holder

6. retaining the feed slide shaft assembly and the middle gear.

Red and black

N

Mechanism board

CN501

Brown and black

N

Blue and white

Fig. 23

Flexible wire

Move the middle gear.

7.

Move the pickup assembly upward from the gear

8. section and remove it from the traverse chassis assembly.

Remove the two screws Q to remove the rack arm.

9.

Pull out the feed slide shaft assembly.

10.

Remove the screw R to remove the spring.

11.

CAUTION:

To reattach the mechanism board, connect the pickup flexible wire to connector CN501 on the mechanism board before unsoldering the short circuit round. Subsequently, fix the mechanism board using screws.

R

Spring

Pickup

Short circuit round

(Grounding point)

Fig. 24

Pickup assembly

Grounding point

P

Shaft holder

Feed slide shaft assembly

Middle gear

Feed motor

1-10

Rack arm

Q

Fig. 26

Pull out

Chassis

Remove gears and motors only when required.

O

Fig. 25

CH-X470RF

Tray motor

Remove the two screws S securing the tray motor.

1.

Remove the two screws T to remove the tray motor

2. assembly from the tray motor holder.

(See Fig.27 and 28)

S

Tray motor assembly

Fig. 27

Tray motor holder

Tray motor

Separation of the chassis (L) assembly and chassis (R) assembly

Remove the two screws U retaining the chassis (L)

1. and (R) assemblies.

Slide the chassis (L) assembly toward the front and

2. detach it, then remove the chassis (L) upward.

(See Fig.29)

Slide and remove upward as shown by the arrow

U

Front side

T

Fig. 28

U

Chassis (L) assembly

Fig. 29

Chassis (R) assembly

1-11

CH-X470RF

CAUTION:

Mounting the traverse mechanism

When mounting the pickup assembly, attach the feed

1. slide shaft assembly to the traverse chassis. Apply E-JC-525 grease to the shaft.

Mount the middle gear and the feed slide shaft to the

2. traverse chassis and secure them with the screw P through the shaft holder.

Before mounting the mechanism board, move the

3. pickup to the outer edge position, then secure the board assembly using the screw N. At this time, check that the rest switch is correctly placed.

To mount the rack arm, first move the pickup to the

4. middle position and secure it with the screws Q.

When reassembling, also refer to the disassembling procedures.

(See Fig.30 to 34)

Pickup assembly

Attached to chassis

P

Shaft holder

Feed slide shaft (half coated with grease)

Middle gear

Motor

Chassis

Mounting the feed motor assembly

Fig. 30

Feed motor

CAUTION:

To reattach the mechanism board, connect the pickup flexible wire to connector CN501 on the mechanism board before unsoldering the short circuit round. Subsequently, fix the mechanism board using screws.

Q

Rack arm

Move the pickup to the middle position

Shaft holder

Mechanism board

N

Spindle motor

Fig. 31

CN501

N

Fig. 33

Flexible wire

1-12

Fig. 32

Pickup

Short circuit round

(Grounding point)

Fig. 34

Mounting the lifter unit

(See Fig.35 to 37)

Insert the shafts f of the traverse mechanism

1.

assembly into the slide grooves g on the lifter unit.

Shift the hook of the lifter unit to the edge, and shift

2. the sliding lever inside the side bracket unit to the edge as well.

With each hole and lever shifted to the edge, mount

3. the lifter unit and side bracket unit from the side. (Check each attached section, and check that the two shafts h of the lifter unit are correctly inserted into the holes i of the side bracket unit. After mounting, check that the levers move together. )

Turn the lifter unit upside down.

4. As shown in Fig. 35, slide the lever 30 mm away from the edge, then mount the lifter bracket assembly.

Attach

Fig. 35

Lifter unit

h

CH-X470RF

f

g

f

M

Side bracket

g

i

f

Traverse mechanism assembly

Fig. 36

Lifter bracket

Shift inside by approx. 30 mm

Expanded view

Fig. 37

1-13

CH-X470RF

Connection of the chassis (L) assembly and chassis (R) assembly

(See Fig.38 to 40)

Attach the lower rod to the chassis (R) assembly.

1. While shifting the rod toward the front side, mount the rod on the lifter unit. With the rod mounted, place the lifter unit on the chassis (R) assembly.

Combine the chassis (L) and (R) assemblies so that

2. the hook section j of the chassis (L) assembly is inserted into the notch of the chassis (R) assembly by sliding it from the front side.

After engaging, secure with the two screws U.

3.

Attach the tension spring between the lifter unit and

4. the chassis.

Lifter unit

j

Lower Rod

Fig. 38

Notch

Attached

Set first

(chassis side)

Tension spring

Set last (lifter side)

Proper orientation

Slide to engage

U

Chassis (R) assembly

Fig. 39

Chassis (L) assembly

U

Combine with (R) chassis

1-14

Fig. 40

Mounting the top plate

(See Fig.41 to 44)

Mount the upper rod on the lifter side l and set it on

1. the rear of the top plate, then mount the other end of the upper rod to m.

Check that the five points (n, o, p, s and r) are

2. correctly positioned. When mounting section s, set it so that section t of the lifter unit is pinched by the bending section of the top plate.

Secure the top plate with six fixing screws K.

3.

CH-X470RF

m

Upper rod

l

Fig. 41

K

Top plate

K

Fig. 42

Expanded view of mounting s

Section t

n

o

p

s

r

Lifter Unit

Point r

Fig. 43Fig. 44

1-15

CH-X470RF

Mounting the front slider and rear slider

(See Fig.45 and 46)

Position the unit with the rear side facing down, then

1. rotate the third gear in the direction of the arrow (clockwise) until the lift arm comes to the position at which the holes are exposed, as shown in Fig. 45-1.

Mount the front slider from the top.

2. Rotate the third gear counterclockwise until the hole of the slider is lined up with the right hole of the stud, as shown in Fig. 45-2.

Mount the E-washer on the shaft.

3.

Position the unit with the front side facing down, then

4. mount the rear slider. Check that the u, v and w positions are correctly mounted as shown in Fig. 46.

Rotate the third gear in the direction of the arrow

5. (counterclockwise) until the lifter unit is at the top position.

Front slider

Check after mounting

Rotate the third gear to move the slider

Fig. 45-1

E-Washer

Fig. 45

Set so the holes are exposed

Rotate until the holes are lined up

Stud

Position so that the stud and right hole are lined up

Fig. 45-2

u

v

w

Rotate the third gear to move the slider

Fig. 46

1-16

CH-X470RF

Mounting the sensor board assembly

(See Fig.47)

Attach the longer spring to the white resin, and

1. attach the shorter spring temporarily to the sensor assembly bracket.

Mount the sensor assembly so that the shaft of the

2. lift arm is inserted into the longer hole on the white resin located on the back of the sensor board assembly.

Attach the shorter spring to the hook of the lift arm.

3.

Attach temporarily

Shorter spring

Longer spring

Sensor assembly fixing screws

I

Fig. 47

I

Shorter spring

Mounting the main PC board assembly

(See Fig.48)

Rotate the third gear clockwise until section x of the

1. front slider and the third hole from the right are lined up. (Be sure to set properly. If incorrectly set, the switches on the board assembly may be damaged.)

After they are correctly positioned, mount the main

2. board assembly.

Position so that the slider hole and third hole from the right are lined up

x

Fig. 48

1-17

CH-X470RF

Pickup replacement procedure

(See Fig.49 to 55)

Remove the bottom cover, front panel and top cover

1. from the exterior section.

Unplug the flexible ribbon wire from connector

2. CN502 on the traverse mechanism PC board assembly.

Turn the rear slider and third gear in the lifter section

3. counterclockwise until the traverse mechanism assembly is in the lowermost (bottom) position.

Unsolder the two wires (black and brown) connected

4. to the tray motor.

Remove the two screws M from the round holes on

5. the chassis (R) assembly to remove the lifter bracket (L).

Remove the lower rod.

6.

Disconnect the two feed motor wires (blue and

7. white), two spindle motor wires (red and black) and two tray motor wires (brown and black) that are soldered to the mechanism board.

Main PCB assembly

M

Lifter bracket (L)

N

Unsolder

Grounding point

CN502

Fig. 49

Third gear

M

Feed motor assembly

Unsolder

N

Short-circuit the grounding point on the mechanism

8. board. Move the mechanism board without disconnecting the wire from connector CN501. Solder the short circuit round on the pickup assembly.

Disconnect the wire from connector CN501 on the

9. mechanism board.

Remove the three fixing screws N from the round

10. holes on the chassis (R) assembly to remove the traverse mechanism board assembly.

Remove the pickup shaft holder fixing screw P to

11. remove the pickup assembly.

CAUTION:

When replacing the pickup, be sure to apply countermeasures against static electricity (grounding the operation table, wrist band and soldering iron). To remove it, first shortcircuit the grounding point on the mechanism board, then lift the mechanism board assembly with CN501 connected. Next, short-circuit the grounding point on the pickup main unit, then unplug the pickup flexible board from connector CN501.

Tray motor assembly

Traverse mechanism board assembly

Fig. 50

Spindle motor

Pickup assembly

Fig. 51

N

CN501

Shaft holder

P

Flexible wire

CAUTION:

1-18

When reassembling, perform in the reverse order.

Pickup

Short circuit round

(Drounding point)

Fig. 52

Remove the two rack arm fixing screws Q.

12. Pull out the feed slide shaft. Remove the shaft holder fixing screw R.

When mounting the lifter bracket after replacing the

13. pickup, shift the lifter unit lever approx. 30 mm towards the inside, then mount the lifter bracket.

Rack arm

CH-X470RF

R

Pickup

Feed slide shaft

Q

Pickup

Middle gear

Fig. 53

P

Shaft Holder

Middle gear

Chassis

Fig. 54

Shift approx. 30 mm

Enlarged diagram

Fig. 55

Lifter unit lever

1-19

CH-X470RF

Forced eject procedures

Magazine eject does not function.

RESET (Press EJECT for 3 sec.)

YES

Completed

Check that the trays remain no more

than 10 mm inside the magazine.

Improperly positioned

Remove the dampers and the top cover to take out the mechanism.

Remove the item(s) causing the

disc-jam through the clearance at

the top of the lifter.

Are trays stored in

the magazine? Check visually.

Remove the bottom cover

NO

Is the disc set in the playing

position?

Rotate the third gear clockwise and

unchuck the disc.

Disconnect the tray from the hook.

NO

YES

Peel off the sticker on the left side

of the unit. Insert a screwdriver

and press the internal lever to

forcibly eject the magazine.

Completed

Remove the lifter bracket (L) and

return the tray to the magazine.

Place the unit with its left side

facing down and apply a slight

shock, then return the tray to the

magazine.

Rotate the third gear clockwise

until the lifter level is below the 9th

tray position.

Press the magazine lock lever to

eject the magazine.

Completed

1-20

Troubleshooting

Servicing procedures for CH-X470RF error displays

CH-X470RF

Error display

E1: Eject error

E2: Position

motor error

E3: Tray motor

error

Servicing procedure

The magazine cannot be ejected until S601 (magazine switch) turns off. Can the magazine be ejected? YES 1, NO 2 1 The magazine switch (S601) does not turn off even though the magazine is completely ejected. 2 Check that the magazine is not engaged with the mechanism assembly.

The lifter does not move up and down when exchanging or ejecting discs. After resetting, check whether or not the lifter moves.YES 3, NO 4 3If the lifter exceeds the required disc position, check the lift position input. (IC601 pin 76) If the lifter does not reach the required disc position, check the mechanism (mainly the lifter elevation mechanism) 4Check that voltage is present at the motor terminal. If voltage is present, check the lifter elevation mechanism. If voltage is not present, separate the motor from the circuit and check again whether or not voltage is present. If voltage is present, next check that the armature resistance of the position motor (resistance between motor terminals) is approx. 12 . If the resistance is excessively low (1 - 2 ), the motor is defective.

Trays cannot be opened or closed when exchanging or ejecting discs. Does the tray move when changing or ejecting discs? YES 5, NO 6 5Check that TRAY OUT SW (S602) and TRAY IN SW (S603) function correctly.

S602 & IC601 pin (46) S603 & IC601 pin (45)

E4: Pick returning

error

When opening

When closing

6Check that the drive voltage is applied to the motor terminal.

If the voltage is present, check the tray mechanism. If the voltage is not present, separate the motor from the circuit and check again whether or

not the voltage is present.

Does the feed (pickup unit) return to the inner area of the disc when ejecting? YES 7, NO 8, 9 7 Check the rest switch. 8If the feed gear is rotated, check the feed transfer mechanism 9If the feed gear is not rotated, check the motor driver and the pattern.

H

L

HL

Other errors occurring in the receiver or controller.

E8: Connection

error

The E1 E8 error displays described above may appear as E-1 E-8, 1E1 1E8, R-1 R-8, or RST1 RST8,

depending on the product.

When selecting the CD Changer mode using function keys, etc., the unit does not enter the CD changer mode, or the E8 error display appears. This signifies trouble relating to communications. aCheck the connection cables between the CD changer and the receiver (CD changer controller). bCheck the CD changer power cord and the fuse (including F901 on the PC board). cCheck IC651 and its peripheral circuits.

1-21

CH-X470RF

CH-X470RF Error code

The following error codes can be displayed and stored in up to 3 memories when the KD-MX3000 is used with the controller. Refer to the KD-MX3000 service manual regarding error code indication. The error code indication when using the earlier controller is the same as the CH-X99,KD-MK88 and other 12CD changer models.

CH-1 error code table

Generating condition Description Error code

Tray extension error

Tray retraction error

Lifter raise error

Lifter lower error

Chuck error

Unchuck error

Eject error

Initialize error

Tray-in switch time out (Tray-in switch Low, Tray-out switch High)

Tray-out switch time out (Tray-in switch High, Tray-out switch High)

Tray-in switch time out (Tray-in switch Low, Tray-out switch Low)

MAG-in switch Low to High

Tray-in switch time out (Tray-in switch Low, Tray-out switch Low)

Tray-out switch time out (Tray-in switch High, Tray-out switch High)

Tray-in switch time out (Tray-in switch Low, Tray-out switch Low)

MAG-in switch Low to High

Wait position time out

Play position time out

Wait position time out

Eject position time out MAG in switch time out

Tray stops part way

Tray-in switch faulty or other defect

Magazine removed when tray partly extende

Tray motor inoperative

Tray retraction stops part way

Tray-in switch faulty or other defect

Magazine removed when tray partly r etracted

Position motor inoperativeWait position time out Position not stable in fine adjust mode Other faultWait position time out Position motor inoperative Position not stable in fine adjust modeWait position time out Other faultWait position time out Position motor inoperativePlay position time out Position not stable in fine adjust modePlay position time out Other fault Position motor inoperativeWait position time out Position not stable in fine adjust modeWait position time out Other fault Position motor inoperativeEject position time out Eject position not attained Magazine not ejected Both Tray-in and Tray-out LowMechanism switch time out Not stable at absolute positionAbsolute position time out

E1 03 00 11

E1 03 00 12

E1 03 00 13

E1 03 00 14

E1 03 00 16

E1 03 00 17

E1 03 00 18

E1 03 00 19

E1 02 00 21 E1 02 00 22 E1 02 00 23 E1 02 00 26 E1 02 00 27 E1 02 00 28 E1 02 00 31 E1 02 00 32 E1 02 00 33 E1 02 00 36 E1 02 00 37 E1 02 00 38 E1 02 00 41 E1 02 00 42 E1 02 00 43 E1 03 00 46 E1 03 00 47

Note: The 1st error code is indicated by E1, while the 2nd and 3rd error codes are respectively indicated by E2 and E3.

1-22

Acceler

ation

Flow of functional operation until TOC read

CH-X470RF

• When the pickup correctly moves to the inner area of the disc

Microprocessor

commands

FMO TC9462

FEED MOTOR

IC581

RESET SW

53

TERMINAL

20

$ 83

$ 82 $81

5V Hi-Z 0V

6V 4V 2V

OFF

ON

• When correctly focused

Focus Servo Loop ON

Power ON

Set Function to CD

Disc inserted

Pickup feed to the inner area

YES

Laser emitted

Focus search

YES

Disc rotates

RF signal eye-pattern remains closed

• When the laser diode correctly emits

Microprocessor

commands

SEL

TC9462

LD

5

CN502 or

22

CN503

$ 84

57

"No disc"

display

• When the disc correctly rotates

Microprocessor commands

5V 0V

4V

0V

Tracking loop closed

RF signal eye-pattern opens

TOC readout

Jump to the first track

Play

Spindle motor (+)

Acceler

ation

Acceleration

Tracking Servo Loop ON

• RF signal

Rough

Servo

Servo CLV

Rough Servo Mode

CLV Servo Mode (ProgramArea)

CLV Servo Mode (Lead-In Area; Digital: 0)

1-23

CH-X470RF

General section

Turn the power on with

no magazine loaded.

Reset

Move the lifter until it

comes to the STOP

position

(shipping position).

YES

Connect the receiver,

etc. and turn the power

on.

Set to the changer

mode.

CD changer indication

appears on the receiver,

etc.

YES

Load the magazine.

Is the disc pulled out to

start play?

YES

Is the disc taken out?

Is the disc rotated?

Is voltage present at

IC521 pin z 2.5 V while

the disc rotates?

Proceed to the Tracking

Is track selection or

search performed

correctly?

NO

section.

The lifter moves up or

down and stops.

The position motor does

not function.

The tray motor goes

forward and back

several times.

Check the connections

to the receiver or the

circuits in the vicinity of

IC651.

NO

YES

NO

YES

NO

YES

NO

Check the MAG SW,

TRAY-IN, and TRAY-

OUT switches.

Proceed to

the Signal

Processing

section.

YES

Check the linear position

sensor (VR601).

YES

Check the wiring of the

CD 9 V power supply

position motor.

Check the TRAY-IN and

TRAY-OUT switches.

Proceed to the Focus

Exchange discs, then

check whether or not the

feed motor moves.

Set from the STOP to

PLAY mode, then check

that the triangle wave

appears at IC581 pins H

Does the laser emit?

Proceed to the Focus

section.

YES

and I .

YES

section.

NO

Check the RESET

switch and feed

section

(Refer to the Feed section).

Check the vicinity of

IC501 6and 7.

1-24

YES

10. Is the playback sound normal?

YES

Normal

NO

Proceed to the Signal

Processing section.

Feed section

CH-X470RF

Is the voltage output at IC521 pin u 5V or 0V?

YES

Is 4V present at both

sides of the feed motor?

YES

Check the feed motor.

Focus section

When the lens is

moving:

Does the S-search waveform appear at IC581 pins H and I?

YES

4V

NO

Is the wiring for IC521

(90) (100) correct?

Is 6V or 2V present at

IC581 Q and R?

Check IC581.

NO

Check the circuits in the vicinity of IC581

Check the pickup and

NO

pins H K.

YES

its connections.

YES

Is 5V present at IC581

pin 6?

YES

Check the vicinity of

IC521.

Check the feed motor

connection wiring.

NONO

Check CD 9V

and 5V.

Spindle section

Is the disk rotated?

YES

Does the RF signal

appear at TP1?

YES

Is the RF waveform at TP1

distorted?

YES

Proceed to the Tracking

section

Tracking section

When the disc is rotated

at first:

NO

Approx. 1.2 V

Is 4V present between

IC581 pins 1 and 2?

Check the spindle motor

and its wiring.

Check the circuits in the vicinity of IC501 J O or

the pickup

Check the circuit in the

vicinity of IC501 pins

NO NO

Is 4V present at IC521

2C.

pin x?

YES

Check the vicinity of

IC581.

YESYES

Check the pickup and

Check IC501 and

IC521.

its connections.

Is the tracking error

signal output at TP3?

YES

Check IC521.

1-25

CH-X470RF

Signal processing section

Is the sound output from both channels (L, R)?

YES

Normal

No sound from either

channel.

YES

Is 9V present at IC101 pin

(8)?

YES

Is the audio signal

(including sampling output

components) output to

IC521 pins ^and | during

YES

Is the audio signal output

at IC101 pins 1

and7during playback?

YES

Check the muting circuit.

NONO

NO

Compare the L-ch and

R-ch to locate the

defective point.

Check the vicinity of the

Q981 audio power

supply.

Check IC521 and its

peripheral circuits.

Check IC101 and its

peripheral circuits

1-26

Description of major ICs

UPD780058GC-291(IC601):CPU

1.Terminal layout 80 61

1

60

CH-X470RF

2.Pin function

PORT

No.

Name

LCDDA

1

LCDSCK

2

LCDCE

3

GND

4

VREF

5

POSCON

6

AVREF1

7

NC

8

NC

9

CDCHECK

10

EPROMDI

11

EOROMDO

12

EPROMCK

13

NC

14

BUS I/O

15

BUS SI

16

BUS SO

17

BUS SCK

18

NC

19

NC

20

NC

21

NC

22

NC

23

NC

24

NC

25

CD ON

26

PWR CONT

27

POSMO+

28

POSMO-

29

TRAYMO+

30

TRAYMO-

31

BUCK

32

GND

33

LSI RESET

34

CCE

35

BUS0

36

BUS1

37

BUS2

38

BUS3

39

NC

40

20

21 40

I/O

O

LCD driver data output

O

LCD driver clock output

O

LCD driver chip enable output

-

Connect to ground

-

Reference voltage output

O

Position control output

-

Connect to 5V

-

Unused output port

-

Unused output port

I

CD check mode input. Reset only.

I/O

EEPROM data input

O

EEPROM data output. Hi durring input.

I/O

EEPROM clock input/output

-

Unused output port

O

JVC bus input/output control(Lo:input)

I

JVC bus data input

O

JVC bus data output

I/O

JVC bus clock input/output

-

Unused output port

-

Unused output port

-

Unused output port

-

Unused output port

-

Unused output port

-

Unused output port

-

Unused output port

O

CD power control Hi:on

O

Power supply control output Hi:on

O

Position motor control output

O

Position motor control output

O

Tray motor control output

O

Tray motor control output

-

CD LSI data clock

-

Connect to ground

O

CD LSI reset

I/O

CD LSI chip enable

I/O

CD LSI data 0(open drain)

I/O

CD LSI data 1 (open drain)

I/O

CD LSI data 2 (open drain)

O

CD LSI data 3 (open drain)

-

Unused output port

Function

41

Pin No.

CD RW

41

NC

42

NC

43

MAG IN

44

TRAY OUT

45

TRAY IN

46

REST

47

DISC SEL

48

EMPH

49

NC

50

OE

51

SHOCK SW

52

SHOCK

53

NC

54

A.MUTE

55

MUTE PWR

56

STAGE

57

STAGE2

58

EPROM CLR

59

RESET

60

REMOCON

61

PWR DET

62

PWR SW

63

BUS INT

64

EJECT

65

NC

66

GND

67

VDD0

68

X2

69

X1

70

GND

71

XT2

72

XT1

73

VDD

74

AVREF0

75

L SENSOR

76

KEY1

77

KEY2

78

KEY3

79

KEY0

80

PORT Name

I/O

O

CD-RW Detect signal output

-

Unused output port

-

Unused output port

-

Magazine switch Lo:magazine inserted

O

Tray extend switch Lo:extension complete

O

Tray retract switch Lo:retraction complete

I

Resr switch

O

Disc select output

O

Emphasis select output Hi:on

-

Unused output port

-

Unused output port

I

Shock proof switch signal input

O

Shock proof output

-

Unused output port

-

Unused output port

O

Power supply for mute

I

LCD,AD key,remote inhibit selector Low:inhidit

-

Unused output port

I

EEPROM clear input Functional only dunng reset

I

Reset input (includes flash write in function)

I

Remote controller signal input

I

Memory power detect input

I

CRTL+B detect input

I

JVC bus com start interrupt input

I

Eject key input

-

Unused output port

-

Connect to ground

-

Conneto to VDD

O

Oscillater (4.19430 MHz)

I

Oscillater (4.19430 MHz)

-

Connect to ground

O

Open

I

Connect to VDD

-

Connect to 5V

-

Connect to ADCONT

I

Linear sensor input(8 bit A/D input)

I

Key input 1 (8 bit A/D input)

I

Key input 2 (8 bit A/D input)

I

Key input 3 (8 bit A/D input)

I

Key input 0 (8 bit A.D input)

Function

1-27

CH-X470RF

TC9490FA (IC521) : DSP

1. Pin layout & Block diagram

DD3

XO

XV

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

SS3

XI

XV

TESIN

DD3VSS3

V

DMO

FMO

DD3

AV

SEL

TEBC

RFGC

REF

V

TRO

FOO

2. Pin function (1/2)

No. Symbol

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

BCK

LRCK AOUT DOUT

IPF VDD3 VSS3

SBOK

CLCK

DATA SFSY SBSY

/HSO /UHSO PVDD3

PDO

TMAX

LPFN LPFO

PVREF

VCOF

AVSS3

SLCO

RFI

AVSS3

49DV

SS3

RO

50

51

DV

DVR

DV

ZDET

V

BUS0

BUS1

BUS2

BUS3

BUCK

/CCE

/RST

V

DD3

LO

DD3

SS5

DD5

LPF

52

53

54

55

56

57

58

59

60

61

62

63

64

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

BCK

I/O

O

Bit clock output pin.32fs, 48fs, or 64fs selectable by command.

O

L/R channel clock output pin. "L" for L channel and "H" for R channel.

O

Audio data output pin. MSB-first or LSB-first selected by command.

O

Digital data output pin. Outputs up to double-speed playback.

O

Correction flog output pin.

-

Digital 3.3V power supply voltage pin.

-

Digital GND pin.

O

Subcode Q data CRCC result output pin. "H" level when result is OK.

I/O

Sub-code P-W data read clock I/O pin. I/O polarity selectable by command.

O

Sub-code P-W data output pin.

O

Playback frames sync signal output pin.

O

Sub-code block sync output pin.

O

Playback speed mode flag output pin.

O

Playback speed mode flag output pin.

-

PLL-only 3.3V power supply voltage pin.

O

EFM and PLCK phase difference signal output pin.

O

TMAX detection result output pin.

I

Inverted input pin for PLL RF amp.

O

Output pin for PLL LPF amp.

-

PLL-only VREF pin.

O

VCO filter pin.

-

Analog GND pin.

O

DAC output pin for data slice level generation.

I

RF signal input pin.

-

Analog 3.3V power supply voltage pin.

generator

Micro-

controller

interface

LRCK

Clock

1-bit DAC

Audio output

AOUT

circuit

DOUT

circuit

Correction

Digital output

IPF

Address

circuit

16 k RAM

DD3

V

SS3

PWM

SBOK

Servo control

ROM

RAM

CLV servo

Sync signal

protection

EFM

Sub code

decoder

DATA

CLCK

Function

Digital equalizer

automatic

adjustment circuit

SFSY

SBSY

/HSO

A/D

VCO

PLL

TMAX

D/A

Data slicer

/UHSO

PV

DD3

PDO

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

TEZI

TEI

SBAD

FEI

RFRP

RFZI

RFCT

AV

DD3

RFI

SLCO

AV

SS3

VCOF

PV

REF

LPFO

LPFN

TMAX

1-28

2. Pin function (2/2)

No. Symbol

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

RFCT

RFZI

RFRP

FEI

SBADTEI

TEI TEZI FOO TRO

VREF

RFGC

TEBC

SEL

AVDD3

FMO DMO

VSS3 VDD3

TESIN

XVSS3

XI

XO

XVDD3

DVSS3

RO

DVDD3

DVR

LO

DVSS3

ZDET VSS5 BUS0 BUS1 BUS2 BUS3 BUCK

/CCE /RST

VDD5

I/O

I

RFRP signal center level input pin.

I

RFRP signal zero-cross input pin.

I

RF ripple signal input pin.

I

Focus error signal input pin.

I

Sub-beam adder signal input pin.

I

Tracking error input pin. Inputs when tracking servo is on.

I

Tracking error signal zero-cross input pin.

O

Focus equalizer output pin.

O

Tracking equalizer output pin.

-

Analog reference power supply voltage pin.

O

RF amplitude adjustment control signal output pin.

O

Tracking barance control signal output pin.

O

APC circuit ON/OFF signal output pin.

-

Analog 3.3V power supply voltage pin.

O

Feed equalizer output pin.

O

Disc equalizer output pin.

-

Digital GND pin.

-

Digital 3.3V power supply voltage pin.

I

Test input pin.

-

System clock oscillator GND pin.

I

System clock oscillator input pin.

O

System clock oscillator output pin.

-

System clock oscillator 3.3V power supply voltage pin.

-

DA converter GND pin.

O

R-channel data foward output pin.

-

DA converter 3.3V power supply pin.

-

Reference voltage pin.

O

L-channel data forward output pin.

-

DC converter GND pin.

O

1 bit DA converter zero data detection flag output pin.

-

Microcontroller interface GND pin.

I/O

Microcontroller interface data I/O pins.

I/O

Microcontroller interface data I/O pins.

I/O

Microcontroller interface data I/O pins.

I/O

Microcontroller interface data I/O pins.

I

Microcontroller interface clock input pin.

I

Microcontroller interface chip enable signal input pin.

I

Reset signal input pin.

-

Microcontroller interface 5V power supply pin.

Function

CH-X470RF

1-29

CH-X470RF

BA15218F-XE (IC101) : Dual operation amplifier

1. Pin layout

OUT1 1

-IN1 2

+IN1 3

VEE 4

2. Block diagram

Vcc

-IN

+IN

1

2

R1

Q5

Q1

Q2

D1

Q3 Q4

8 Vcc

7 OUT2

6 -IN2

5 +IN2

C2

R5

Q6

Q9

Q8

Q10

Q7

R7

Q11

R6

Q12

R8

Q18Q13

OTHER

CH

Q19

Q17Q16

VEE

C1

R3R2

R4

OUTPUT

Q14 Q15Q114

R9

1-30

BR24CO1AF-X-W(IC604):EP ROM

2.Block Diagrram1.Terminal Layout

VCC TEST SCL SDA

CH-X470RF

BR24C01AF

A0 A1 A2 GND

3.Pin Function

Symbol

VCC GND

A1 A2 A3

SCL SDA

TEST

I/O

1A 0

7bit

2A 1

Address Decoder

3A 2

4GND

Function

-

I I

I

Puwer Supply Ground(OV) Slaves Address Set(Pin) Serial Clock Input Slaves and Word Address,Serial Data Input, Serial Data Output(*) Ground

High Voltage Gen.

1,024bit EEPROM Array

7bit

START STOP

Address Register

Control logic

Vcc level detect

Slave Word

ACK

8bit

Data

Register

8 VCC

7 TEST

6 SCL

5SDA

(*)

An open drain output requires a pull-up resistor.

1-31

CH-X470RF

FAN8037 (IC581) : CD driver

1. Pin layout & Block diagram

48 47 46 45 44 43 42 41 40 39 38 37

2. Pin function

Symbol

No.

1

IN2+

2

IN2-

3

OUT2

4

IN3+

5

IN3-

6

OUT3

7

IN4+

8

IN4-

9

OUT4

10

CTL1

11

FWD1

12

REV1

13

CTL2

14

FWD2

15

REV2

16

SGND

17

FWD3

18

REV3

19

CTL3

20

SB

21

PS

22

MUTE

23

PVCC2

24

DO7-

1

2

3

4

5

6

7

8

9

10

11

12

13 14 15 16 17 18 19 20 21 22 23 24

Function

I/O

I

CH2 op-amp input(+)

I

CH2 op-amp input(-)

O

CH2 op-amp output

I

CH3 op-amp input(+)

I

Ch3 op-amp input(-)

O

CH3 op-amp output

I

CH4 op-amp input(+)

I

CH4 op-amp input(-)

O

CH4 op-amp output(+)

I

CH5 motor speed control

I

CH5 forward input

I

CH5 reverse input

I

CH6 motor speed control

I

CH6 forward input

I

CH6 reverse input

-

Signal ground

I

CH7 forward input

I

CH7 reverse input

I

CH7 motor speed control

I

Stand by

I

Power save

I

All mute

-

Power supply voltage

O

CH7 drive output(-)

M

s

S

w

C

M

s

S

w

C

M

s

S

w

C

T.S . D

D

STAND BY ALL MUTE

POWER SAVE

Pin No.

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

Symbol

DO7+

DO6-

DO6+

PGND2

DO5-

DO5+

DO4-

DO4+

DO3-

DO3+

PGND1

DO2-

DO2+

DO1-

DO1+

PVCC1

REGOX

REGX

RESX VREF

SVCC

IN1+

IN1-

OUT1

36

35

34

33

32

31

30

29

28

27

26

25

I/O

Function

O

CH7 drive output(+)

O

CH6 drive output(-)

O

CH6 drive output(+)

-

Power ground2

O

CH5 drive output(-)

O

CH5 drive output(+)

O

CH4 drive output(-)

O

CH4 drive output(+)

O

CH3 drive output(-)

O

CH3 drive output(+)

-

Power ground1

O

CH2 drive output(-)

O

CH2 drive output(+)

O

CH1 drive output(-)

O

CH1 drive output(+)

-

Power supply voltage

I

Regulator feedback input

O

Regulator output

I

Regulator reset input

I

Bias voltage input

-

Signal supply voltage

I

CH1 op-amp input(+)

I

CH1 op-amp input(-)

O

CH1 op-amp output

1-32

HD74HC126FP-X (IC651) : Buffer

CH-X470RF

1.Terminal layout

1C

1

1A

2 3

1Y

4

2C

5

2A

6

2Y

GND

2.Block diagram

7

Input

3Y

14

3A

13 12

3C

11

4Y

10

4A

9

4C

8

Vcc

Vcc Vcc

1A 2A 3A 4A 1C 2C 3C

See Function Table

4C

3.Pin function

Output

1Y

Output

2Y

Output

3Y

Output

4Y

Input Output

C

A

L

X

H

L

H

Note:

1k

CL

Sample as Load Circuit 1

Y Z H L

H : High L : Low X : H and L Z : H.L.X

S1

1k

1-33

CH-X470RF

IC-PST9333U-X (IC602) : Reset IC

1. Pin layout

NC

GND

2. Block diagram

1

2

Vcc

NC

GND

4

1

4

Vcc

3

VOUT

3

VOUT

GND

2

3. Pin function Pin No.

1 2 3 4

Symbol NC GND VOUT Vcc

Function Non connect GND terminal Reset signal output terminal Power supply terminal

1-34

TA2147F-X (IC501) : RF amp

1. Pin layout & Block diagram

GND

RFN

RFO

AGCIN

RFGC

RFGO

RFRPIN

RFRP

FEN

FEO

CH-X470RF

VRO

GVSW

cc

24

1 V

3 k

23

40 pF

20 k

2

FNI

180 k

60 k

80 k

22

180 k

40 pF

60 k

20 k

3

FPI

30 k

80 k

2

21

1

4

TPI

0.5

20 k

240 k

15 pF

2

20

k

5

TNI

0.5

15 pF

240 k

1.75 k

19

6 MDI

40 k

14 k

2 k

18

BOTTOM

PEAK

1 k

7

LDO

20 k

1.3 V

60 A

12 k

17

8

SEL

12 k

2 k

50 k

20 k

50 A

16

40 k

9

TEBC

10 pF

15 k

20 k

15

10 pF

10

TEN

20 k

40 k

14

20 A

11

TEO

13

20 k 20 k

PEAK

50 k 15 k

12

RFDC

2. Pin function

Symbol I/O Function

No.

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Vcc FNI FPI TPI TNI

MDI

LDO

SEL

TEBC

TEN

TEO

RFDC

GVSW

VRO FEO

FEN

RFRP

RFRPIN

RFGO RFGC

AGCIN

RFO RFN

GND

-

3.3V power supply pin

I

Main-beam amp input pin

I

Main-beam amp input pin

I

Sub-beam amp input pin

I

Sub-beam amp input pin

I

Monitor photo diode amp input pin

O

Laser diode amp output pin

I

APC circuit ON/OFF control signal, laser diode control signal input or bottom/peak detection frequency change pin

I

Tracking error balance adjustment signal input pin

I

Tracking error signal generation amp negative-phase input pin

O

Tracking error signal generation amp output pin

O

RF signal peak detection output pin

I

AGC/FE/TE amp gain change pin

O

Reference voltage output pin

O

Focus error signal generation amp output pin

I

Focus error signal generation amp negative-phase input pin

O

Signal amp output pin for track count

I

Signal generation amp input pin for track count

O

RF signal amplitude adjustment amp output pin

I

RF amplitude adjustment control signal input pin

I

RF signal amplitude adjustment amp input pin

O

RF signal generation amp output pin

I

RF signal generation amp input pin

-

GND pin

1-35

CH-X470RF

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.49668)

200112

JVC CHX-470-RF Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety precaution

Preventing static electricity

Disassembly method

Forced eject procedures

Troubleshooting

Flow of functional operation until TOC read

Description of major ICs