JVC KDLX-50-R Service manual

SERVICE MANUAL

CD RECEIVER

KD-LX50R

KD-LX50RKD-LX50R

Area Suffix

Contents

E ---- Continental Europe

VCR

ATT

MODE

DISP

SOURCE

S S M

KD-LX50R

INTLOCALMONOSCM

BBE

RPT RND

BAND

10789 11 12

OFFSEL

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan

(No.49562)

Printed in Japan 200005(O)

Safety precaution 1-2 Preventing static electricity 1-3 Instructions 1-4~ Disassembly method 2-1 Maintenance of laser pickup 2-12 Extention cord connectiong method 2-13 Functions of the mechanism under the service mode 2-16

This service manual is printed on 100% recycled paper.

Flow of functional operation until TOC read 2-18 Description of major ICs 2-20 Block diagram 2Standard schematic diagrams 2Printed circuit boards 2Parts list 3-1~19

No.49562

May. 2000

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

CD mechanism ass’y

Damper bracket

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.

Front bracket

Feed motor ass’y

FD screw

CD mechanism control board

FD gear

Soldering

Pickup unit

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

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)

Disassembly method

Removing the top chassis

(See Fig.1 to 5)

Remove the two screws A attaching the bottom cover to the top chassis on the bottom of the body.

Remove the two screws B attaching the top chassis on both sides of the body.

Remove the two screws C and the two screws D attaching the heat sink on the left side of the body.

Remove the two screws E and the screw F on the back of the body.

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

Move the top chassis upward and disconnect the CD mechanism connector from the main board connector by pulling it. Remove the top chassis from the body.

Bottom cover

Fig.1

Top chassis

Heat sink

Fig.2

Top chassis

Fig.3

Fig.5

Fig.4

Removing the main board assembly

(See Fig.6 and 7)

Prior to performing the following procedure, remove the top chassis.

Disconnect the flexible harness from connector CN701, the card wire from CN702 on the main board and the harness from CN503 and CN504 respectively.

Remove the three screws H attaching the main board assembly to the bottom cover on the upper side of the body.

Remove the screw I attaching the rear panel and the bottom cover on the back of the body. Move the main board in the direction of the arrow and release the two joints a. (At this point, the main board can be removed with the rear panel and the rear heat sink.)

Remove the screw J and the two screws K attaching the rear heat sink on the back of the body.

Remove the three screws L and the screw M attaching the rear panel. Now, the main board assembly will be removed.

CN503

Joint a

CN702

CN504

CN701

Joint a

Front panel assembly

Fig.6-1

ATTENTION:

when reassembling, correctly engage the switch S561 and S562 on the main board with the part e of the operation assembly (Refer to Fig.6-2,17 and 18).

Main board

Rear panel

S652

Fig.6-2

Rear heat sink

S651

Fig.7

Removing the front panel assembly

(See Fig.8,9 and 10)

Prior to performing the following procedure, remove the top chassis assembly.

Disconnect the flexible harness from connector CN701 on the main board assembly.

Remove the four screws N attaching the front panel assembly on both sides of the body. Remove the front panel toward the front.

CN701

Front panel assembly

Fig.8

Front panel assembly

Fig.10

Removing the Front Board (See Fig.11)

Prior to performing the following procedure, remove the top chassis assembly and the front panel assembly.

Remove the four screws O attaching the front board on the back of the front panel assembly and release the eight joints b.

Front panel assembly

CN701

Fig.9

Joints b

Fig.11

Removing the lifter unit (See Fig.12)

Prior to performing the following procedure, remove the top chassis assembly and the front panel assembly.

Disconnect the harness from connector CN503 and CN504 on the main board.

Remove the four screws P and detach the lifter unit from the bottom cover.

Removing the feed motor (L) (See Fig.13)

Prior to performing the following procedure, remove the lifter unit.

Remove the washer attaching the clutch assembly and detach the clutch assembly from the shaft of the lifter unit.

Remove the two screws Q attaching the feed motor (L).

CN503

CN504

Lifter unit assembly

Fig.12

Lifter unit assembly

Removing the feed motor (R) (See Fig.14)

Prior to performing the following procedure, remove the lifter unit.

Remove the washer attaching the clutch assembly and detach the clutch assembly from the shaft of the lifter unit.

Remove the two screws R attaching the feed motor (R).

Clutch assembly

Washer

Clutch assembly

Feed motor (L) assembly

Fig.13

Lifter unit assembly

Washer

Feed motor (R) assembly

Fig.14

Removing the operation assembly

(See Fig.15 to 18)

Prior to performing the following procedure, remove the top chassis assembly, the front panel assembly and the lifer unit.

Remove the screws S attaching the right and left brackets which fix gears on both sides of the operation assembly.

Remove the springs 5 and 6 from the operation assembly.

Disconnect the card wire from connector CN702 on the main board and remove the operation assembly.

ATTENTION:

when reassembling, correctly engage the switch S561 and S562 on the main board and the right gear with the part e of the operation assembly.

Bracket (R)

Spring 5

Operation assembly

Fig.15

CN702

Bracket (L)

Spring 6

S652

Bracket (R)

S652

S651

Operation assembly e

Fig.16

Operation assembly

Operation assembly e

S651

Fig.17Fig.18

Removing the operation switch board

(See Fig.19 and 20)

Prior to performing the following procedure, remove the operation assembly.

Remove the six screws T attaching the button panel on the operation assembly.

Pull out the operation switch board from inside of the button panel.

Button panel

Fig.19

Operation switch board

Fig.20

Removing the CD mechanism assembly

(See Fig.21)

Prior to performing the following procedure, remove the top chassis.

Remove the three screws U and the CD mechanism assembly from the top chassis.

CD mechanism assembly

Fig.21

Disassembly method

Removing the voice recorder

(See Fig.1 to 3)

Remove the two screws A on both sides of the body and detach the top cover upward.

Remove the two screws B and the two screws C attaching the voice board.

Remove upward the bushing attaching the cord. Remove the main board from the base chassis while detaching the pin jack.

Disconnect the sub board from connector CN851 on the main board.

Disconnect the harness from connector CN852 on the main board. Then disconnect the cord from the main board.

Voice board

Top cover

Fig.1

Pin jack

CN852

Bushing

Fig.2

Sub board

Voice board

CN851

Cord

Fig.3

Removing the CD mechanism control board(See Fig.1 and 2)

Unsolder the part a and b on the CD mechanism control board.

CD mechanism ass’y

Damper bracket

Remove the stator c fixing the CD mechanism control board and the damper bracket (To remove the stator smoothly, pick up the center part).

Remove the screw A attaching the CD mechanism control board.

Remove the CD mechanism control board in the direction of the arrow while releasing it from the two damper bracket slots d and the front bracket slot e.

Disconnect the flexible wire from connector on the pickup unit.

ATTENTION:

Turn the FD gear in the direction of the arrow to move the entire pickup unit to the appropriate position where the flexible wire of the CD mechanism unit can be disconnected easily (Refer to Fig.2).

Front bracket

FD gear

Fig.1

Pickup unit

Fig.2

CD mechanism control board

Flexible wire

Shift the lock

Loading motor

Pull outward

CD mechanism control board

Front bracket

Fig.3

Front bracket

Pull outward

Flame

Fig.4

Removing the loading motor

(See Fig.3 to 5)

Prior to performing the following procedure, remove the CD mechanism control board.

Remove the two springs f attaching the CD mechanism ass’y and the front bracket.

Loading motor

Belt

Remove the two screws B and the front bracket while pulling the flame outward.

Remove the belt and the screw C from the loading motor.

Removing the CD mechanism ass’y

(See Fig.1, 6 to 9)

Prior to performing the following procedure, remove the CD mechanism control PWB and the front bracket (loading motor).

Remove the three screws D and the damper bracket.

Raise the both sides fix arms and move the fix plates in the direction of the arrow to place the four shafts g as shown in Fig.8 and 9.

Remove the CD mechanism ass’y and the two springs h attaching the flame.

CD mechanism ass’y

Flame

Fix plate (L)

Fig.5

Damper bracket

Fig.6

Fig.7

Rear damper bracket

Fix arm (L)

Remove the two screws E and both sides rear damper brackets from the dampers. Detach the CD mechanism ass’y from the left side to the right side.

ATTENTION:

The CD mechanism ass’y can be removed if only the rear damper bracket on the left side is removed.

Fix arm (R)

Damper

Fig.8

Rear damper bracket

Fig.9

Damper

Fix plate(R)

Removing the feed motor ass’y

(See Fig.10)

Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor) and the CD mechanism ass’y.

Remove the two screws F and the feed motor ass’y.

FD screw

Feed motor ass’y

Part j

Part k

Pickup unit

Removing the pickup unit

(See Fig.10 and 11)

*Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor), the CD mechanism ass’y and the feed motor ass’y.

Detach the FD gear part of the pickup unit upward. Then remove the pickup unit while pulling out the part j of the FD screw.

ATTENTION:

Remove the screw G attaching the nut push spring plate and the pickup mount nut from the pickup unit. Pull out the FD screw.

When reattaching the pickup unit, reattach the part k of the pickup unit, then the part j of the FD screw.

FD gear

Nut push spring plate

FD screw

Pickup unit

Fig.10

Pickup mount nut

Pickup unit

Fig.11

Removing the spindle motor

(See Fig.12 and 13)

Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor), the CD mechanism ass’y and the feed motor ass’y.

Turn up the CD mechanism ass’y and remove the two springs m on both sides of the clamper arms. Open the clamper arm upward.

Turn the turn table, and remove the two screws H and the spindle motor.

Fig.12

Spindle motor

Fig.13

Adjustment method

Caution : Replacing the pickup

To prevent damage to the laser diode static electricity destroys the laser diode. Always take countermeasure to performing repairs around the laser pickup.

1. Do not touch the area around the laser diode or the actuator.

2. Do not check the laser diode with a tester or other device (the laser diode can be broken quite easily).

3. Short-circuit the laser pickup Solder the land in the center of the flexible cable of the laser diode and help prevent damage from static electricity.

Caution : Solder rejection or cuts a pattern with nipper at shortstop point after short circuiting with clip with terminal face of flexible cable in the static electricity countermeasure soldering iron application that is not done. And the rejection back inserts it in connector immediately and do not touch terminal side of connector either.

Recommendation Soldering iron HAKKO ESD countermeasures product

Soldering

Caution : Do not forget to remove the soldered laser diode short-circuit after finishing repair, and leave the circuit open.

Maintenance of laser pickup

(1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cotton swab.

(2) Life of the laser diode When the life of the laser diode has expired, the following symptoms will appear. (1) The level of RF output (EFM output:ampli tude of eye pattern) will be low.

Is RF output

1.0 0.35Vp-p?

YES

O.K

(3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power.Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the semi-fixed resistor. If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should be replaced. If the semi-fixed resistor is adjusted while the pickup is functioning normally,the laser pickup may be damaged due to excessive current.

Replace it.

Replacement of laser pickup

Turn off the power switch and,disconnect the power cord from the ac outlet.

Replace the pickup with a normal one.(Refer to "Pickup Removal" on the previous page)

Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at TP1.

Finish.

Extension cord connecting method

Using the extention cords to connect the front panel with the main board

Remove the main board follwing the disassembly methode. Then reattachi the heat sink to main board.

Using the 2pin extention cord (EXTLX001-2p),

1. connect the harness of the feed motor (L) assembly with the connector CN503 on the main board.

Using the 2pin extention cord (EXTLX001-2p),

2. connect the harness of the feed motor (R) assembly with the connector CN504 on the main board.

Using the jig board (EXTLX002-SWPWB), its

3. installing to the chassis, then using 4pin extention cord (EXTLX002-4P) connect the harness of the lifter detecting board with the connector CN704 on the board.

Connect the connector (EXTLX001-6PC) and

4. extension wire (EXTLX001-6PF), connect the 6pin connector CN702 on the main board.

Connect the connector (EXTLX002-16PC) and

5. extension wire (EXTLX002-16PF), connect the 16pin connector CN701 on the main board.

EXTGS004-26P

EXTLX001-16PF

EXTLX002-SWPWB

EXTLX002-4P

EXTLX002-16PC

EXTLX001-2P

EXTLX001-6PC

EXTLX001-2P

EXTLX001-6PF

Extension cord list for KD-LX50R

EXTLX002-JIG : Kit including the following 8 extension parts.

No.

1 2 3 4 5 6 7

Parts number Quantity Description EXTLX001-2P EXTLX001-6PF EXTLX001-6PC EXTLX002-16PF EXTLX002-16PC EXTLX002-SWPWB EXTLX002-4P

Besides the above kit, we offer the conventional extension cord for CD mechanism which are not essential to operation check or service. The mechanism should be directly connected to the board using the extension wire. EXTGS004-26P

2 1 1 1 1 1 1

2Pin, 30cm extension cord 6Pin, 30cm flat wire 6Pin x 2, interlocking connector 16Pin flat wire 16Pin, interlocking connector 3 switch PWB 4Pin, 30cm extension cord

EXTGS004-26P

EXTLX001-16PF

EXTLX002-SWPWB

EXTLX002-4P

EXTLX002-16PC

EXTLX001-2P

EXTLX001-6PC

EXTLX001-2P

EXTLX001-6PF

Reassembly

1. Perform reassembly be reversing the removing process of "removal of main parts". CAUTION 1: Prior to reattaching the heat sink, make sure to reattache the top chassis.

Functions of the mechanism under the service mode

With the three error modes stored in maximum in the internal memory of the mechanism in the body of this system, it is posible under the service mode to call the contents of error according to the following steps when any error has occurred.

Press the three buttons (UP button )+( button)+(Func button ). Then it is possible to select the follwing service modes. After changing over to the service mode, press the UP button and DOWN button to change the mode. For executing the respective service modes, press the SEL button. With the service mode 2 , it is possible to call the error codes of the mechanism.

NORMAL MODE

(UP button ) + ( button) + ( button) at the same time.

DELEEPROM

CD-CH ERR

DEL CH-ERR

RUNNING

DELDATA

CD-ERR

Data stored in EEPROM

1. RDS data

2. CD mechanism error cord

3. Station name (to be input by user)

4. DISC name (to be input by user)

5. AUX input name *Any data 3 to 5 above should not be deleted.

: Deletion of entire EEPROM data. This mode is used when shipping this system from factry.

: This mode is used only when the CD changer is connected.

: Running mode (Do not use this mode under the servise mode)

: (Deletion of CD error code and RDS data)

: Calling of CD mechanism error code

SEL MODE

SOURCE

DISP RDS

PTY OFF/

1. Display of mechanism error

Error codesDescriptionOccurrence condition

Disc loading error

Eject error

Error during standby for loading

2. Display of CD error

Pickup feeding error

1. Inner peripheral feeding error (10sec.)

2. Outer peripheral feeding error (10sec.) Focus search error In the case of focusing error after 3-way focus searching

Tracking balance adjusting error In the case of time-over (1sec.) of timer TOC area searching error In the case of time-over (10sec.) of timer Reading error IN the case of time-over (30sec.) of timer 1st tracking access error In the case of time-over (10sec.) of timer Last tracking access error In the case of time-over (10sec.) of timer Q code reading error In the case of time-over (0.6sec.) of timer TEXT data reading error

1. SW4 is not turned off.

2. SW3 is not turned on.

1. SW# is not turned off.

1. In case SW2 has been positioned to "L" before starting loading during waiting for 15sec.

The pickup cannot returned to the inner peripheral, and the REST switch is not turned off. The pickup cannot be returned to the outer peripheral, and the REST switch is not turned off. In case the focus cannot be searched by one set of focus searching (3-way focus searching) after disc change and focus shock, judge that the focus searching system is in error. In case tracking balance cannot be adjusted even after elapse of 1sec. following execution of the adjusting command (TBA).

In case TOC area searching is not ended even after elapse of 10sec. In case reading is not ended even after elapse of 30 sec. during TOC reading action.

In case the first tracking access is not ended even after elapse of 10sec. following completion of TOC reading. In case the last tracking access is not ended even after elapse of 10sec. following completion of first tracking under the RUNNING mode. In case the Q code cannot be read for 0.6sec. during playing TOC program area.

In case all TEXT data cannot be read.

09 0011 09 0013

01 0021

80 0031

Error codesDescriptionOccurrence condition

04 0051 04 0052

81 0053

82 0054

82 0055 84 0059

80 0060

80 0061

80 0062

80 0063

Flow of functional operation until TOC read

Power ON

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

Set Function to CD

• When the laser diode correctly emits

Microprocessor

commands

FMO MN662748RPM "32"

FEED MOTOR +TERMINAL

TERMINAL

IC661"26" REST SW

• When correctly focused

AN8806SB-W 27

Focus Servo Loop ON

Disc inserted

Pickup feed to the inner area

Laser emitted

Focus search

Disc rotates

RF signal eye-pattern remains closed

Tracking loop closed

RF signal eye-pattern opens

TOC readout

YES

Microprocessor

commands

MN662748RPM 57

CN602 2

"No disc"

display

• When the disc correctly rotates

Microprocessor commands

BCM MN662748RPM 24

Spindle motor (-) IC661 "2"

AccelerationAcceleration

0.5 Sec

Rough

Servo

0.5 Sec

Servo CLV

Jump to the first track

Play

Tracking Servo Loop ON

• RF signal

Rough Servo Mode

CLV Servo Mode (ProgramArea)

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

Feed Section

Is the voltage output at

IC631 pin "26" 2.5V or

YES

Is 4V present at both

sides of the feed motor?

YES

Is the wiring for IC941

(10) ~ (15) correct?

Is 6V or 2V present at

IC601 "26" and "27"?

YES

Is 5V present at IC601

pin "5"?

YES

Check the vicinity of

IC941.

Check the feed motor

connection wiring.

NONO

Check CD 9V

and 5V.

Check the feed motor.

Focus Section

When the lens is

moving:

Does the S-search

waveform appear at

IC601 pins "17" and "18"?

Spindle Section

Is the disk rotated?

YES

Does the RF signal

appear at TP1?

YES

Check IC661.

YES

Check the circuits in

the vicinity of IC661

pins "17" ~ "20".

Check the pickup and

its connections.

Is 3.5V present at IC661

pins "1" and "2" ?

Check the spindle motor

and its wiring.

YES

NO NO

Is 4V present at IC631

pin "25" ?

YES

Check the vicinity of

IC661.

Check IC601 and

IC631.

Is the RF waveform at TP1

distorted?

YES

Proceed to the Tracking

section

Tracking Section

When the disc is rotated

at first:

Is the tracking error signal

output at IC631 "33"?

Check IC601.

Approx. 1.2 V

YES

Check the circuits in the

vicinity of IC601 "10" ~

"18" or the pickup

Check the circuit in the

vicinity of IC601 pins

"20" ~ "40".

YESYES

Check the pickup and

its connections.

BA3220FV-X (IC301,IC401) : Driver

1. Pin layout & Block diagram

CL- LGND OUTL OUTR RGND CR - CR +

1314

REFL REFR

2143675

CL+ Vcc INL NFL FIL NFR INR

1112 9 810

FILTER

2. Pin functions

Symbol Function

No.

CL+

Vcc

INL

NFL

FIL

NFR

INR

CR+

CR-

RGND

OUTR

OUTL

LGND

CL-

Powe supply terminal for amp. power supply terminal. input terminal. Negative feedback terminal. Filter terminal. Negative feedback terminal. Input terminal Power supply terminal for amp. Output terminal of internal amp. Rch GND terminal. Rch output terminal. Lch output terminal. Lch GND terminal. Output terminal of internal amp.

+ 51 hidden pages