Jvc KD-S5-M Service Manual

SERVICE MANUAL

CD RECEIVER

KD-S5M

Contents

Area Suffix

Northerm America

COMPACT

DIGITAL AUDIO

Safety precaution 1-2 Preventing static electricity 1-3 Location of main parts 1-4 Disassembly method 1-5 Adjustment method 1-10

Flow of functional operation until TOC read 1-11 Maintenance of laser pickup 1-13 Replacement of laser pickup 1-13 Description of major ICs 1-14

No.49586

Jan. 2001

KD-S5M

Safety precaution

CAUTION

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

KD-S5M

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

Soldering

FD gear

Pickup unit

1-3

KD-S5M

Location of main parts

Control unit

Display

LED & key control board

Main uni

CD mechanism

Main board

Mechanism relay board

Power IC

ISO connector

Main board

Loading motor

Antenna jack

Tuner

pack

Connector to controller

1-4

Damper

Spindle motor

Optical pick up unit

Feed motor

Damper

Disassembly method

Removing the front panel unit

(See Fig.1)

1. Press the release switch and remove the front panel unit in the direction of the arrow.

KD-S5M

Fig.1

Removing the front chassis (See Fig.2)

1. Insert a screwdriver to the joints a on the side of the front chassis and two joints b on the right side, then detach the front chassis toward the front side.

Removing the heat sink (See Fig.3)

1. Remove the three screws A attaching the heat sink on the left side of the body, and remove the heat sink.

Front chassis

Fig.2

Heat sink

Fig. 3

Removing the bottom cover (See Fig.4)

1.2.Turn the body upside down.

Insert a screwdriver to the two joints c and two joints d on both sides of the body and the joint e on the back of the body, then detach the bottom cover from the body.

Regulator board

Fig. 4

1-5

KD-S5M

Removing the main amplifier board

(See Fig.5 and 6)

Remove the front chassis.

Remove the bottom cover.

Remove the two screws B attaching the main amplifier board assembly on the bottom of the body.

Remove the three screws C attaching the main amplifier board assembly on the back of the body.

Disconnect connector CN501 on the main amplifier board assembly from the CD mechanism assembly.

Main amplifier board

CN501

Fig.5

Fig. 6

Removing the CD mechanism assembly

(See Fig.7)

Remove the front chassis.

Remove the bottom cover.

Remove the main amplifier board assembly.

Remove the three screws D attaching the CD mechanism assembly from the top cover.

Removing the control switch board

(See Fig.8 and 9)

Remove the front chassis.

Remove the four screws E attaching the rear cover on the back of the front panel unit.

Remove the control switch board from the front panel unit.

CD mechanism assembly

Fop cover

Fig. 7

Fig. 8

Control switch board

1-6

Fig. 9

KD-S5M

Prior to disassembling the CD mechanism, remove the following parts.

The front panel unit and the front chassis (Refer to Fig.1 and 2)

The heat sink (Refer to Fig.3)

The bottom cover (Refer to Fig.4)

The main amplifier board (Refer to Fig.5 and 6)

The CD mechanism ass’y (Refer to Fig.7)

Removing the CD mechanism control board(See Fig.10 and 11)

Unsolder the part f and g on the CD mechanism control board.

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

CD mechanism ass’y

Front bracket

Damper bracket

Fig.10

Pickup unit

Flexible wire

CD mechanism control board

Shift the lock

Remove the screw F 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 i and the front bracket slot j.

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.11).

FD gear

Loading motor

Fig.11

CD mechanism control board

Front bracket

Fig.12

Pull outward

Flame

Front bracket

Fig.13

Pull outward

1-7

KD-S5M

Removing the loading motor

(See Fig.12 to 14)

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

Remove the two springs k attaching the CD mechanism

1. ass’y and the front bracket.

Remove the two screws G and the front bracket

2. while pulling the flame outward.

Remove the belt and the screw H from the loading

3. motor.

Removing the CD mechanism ass’y

(See Fig.10, 15 to 18)

CD mechanism ass’y

Flame

Loading motor

Belt

Fig.14

Damper bracket

Fig.15

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

Remove the three screws I 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 l as shown in Fig.17 and 18.

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

Remove the two screws J 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 plate (L)

Fix arm (R)

Fig.16

Rear damper bracket

Fig.17

Rear damper bracket

Fix plate(R)

Fix arm (L)

Damper

1-8

Damper

Fig.18

KD-S5M

Removing the feed motor ass’y

(See Fig.19)

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 K and the feed motor ass’y.

Removing the pickup unit

(See Fig.19 and 20)

*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.

1. Then remove the pickup unit while pulling out the part n of the FD screw.

Feed motor ass’y

FD gear

Nut push spring plate

FD screw

Pickup unit

Fig.19

Part n

Part O

Pickup unit

Pickup mount nut

Pickup unit

ATTENTION:

Remove the screw L 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 o of the pickup unit, then the part n of the FD screw.

Removing the spindle motor

(See Fig.21 and 22)

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

1. two springs p on both sides of the clamper arms. Open the clamper arm upward.

Turn the turn table, and remove the two screws M

2. and the spindle motor.

FD screw

Spindle motor

Fig.20

Fig.21

Fig.22

1-9

KD-S5M

Adjustment method

Test instruments required for adjustment

1. Digital oscilloscope (100MHz)

2. AM Standard signal generator

3. FM Standard signal generator

4. Stereo modulator

5. Electric voltmeter

6. Digital tester

7. Tracking offset meter

8. Test Disc JVC :CTS-1000

9. Extension cable for check EXTGS004-26P 1

Standard measuring conditions Power supply voltage DC14.4V(10.5~16V) Load impedance 20Kohm(2 Speakers connection) Output Level Line out 2.0V (Vol. MAX)

How to connect the extension cable for adjusting

Standard volume position Balance and Bass &Treble volume : lndication"0" Loudness : OFF BBE : OFF

Frequency Band FM 87.5MHz ~ 108.0MHz MW 520kHz ~ 1620 kHz

Dummy load Exclusive dummy load should be used for AM,and FM. For FM dummy load,there is a loss of 6dB between SSG output and antenna input.The loss of 6dB need not be considered since direct reading of figures are applied in this working standard.

1-10

EXTGS004-26P

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

KD-S5M

• When the laser diode correctly emits

Microprocessor

commands

FMO TC9462 "53"

FEED MOTOR +TERMINAL

TERMINAL

IC581 "5"

REST SW

• When correctly focused

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

"No disc"

display

• When the disc correctly rotates

Microprocessor commands

Spindle motor (-) IC581 "7"

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)

1-11

KD-S5M

Feed Section

Is the voltage output at

IC521 pin "53" 5V or 0V?

Is 4V present at both

sides of the feed motor?

YES

Is the wiring for IC521

(90) ~ (100) correct?

Is 6V or 2V present at

IC581 "5" and "6"?

YES

Is 5V present at IC581

pin "11"?

YES

Check the vicinity of

IC521.

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

IC581 pins "17" and "18"?

Spindle Section

Is the disk rotated?

YES

Does the RF signal

appear at TP1?

YES

Check IC581.

YES

Check the circuits in

the vicinity of IC581

pins "15" ~ "18".

Check the pickup and

its connections.

Is 4V present at IC581

pins "7" and "8" ?

Check the spindle motor

and its wiring.

YES

NO NO

Is 4V present at IC521

pin "55" ?

YES

Check the vicinity of

IC581.

Check IC501 and

IC521.

Is the RF waveform at TP1

distorted?

Proceed to the Tracking

section

Tracking Section

When the disc is rotated

Is the tracking error signal

1-12

YES

at first:

Approx. 1.2 V

output at IC501 "12"?

YES

Check IC521.

Check the circuits in the

vicinity of IC501 "19" ~

"24" or the pickup

Check the circuit in the

vicinity of IC501 pins

"2" ~ "12".

YESYES

Check the pickup and

its connections.

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.

KD-S5M

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.

1-13

KD-S5M

Descriprion of major ICs

TEA6320T-X(IC301) : E.volume

1.Terminal Layout

SDA

GND

TL B2L B1L

IVL

ILL

QSL

IDL

MUTE

ICL

IMD

IBL IAL

2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

CD-CH

TAPE

TUNER

OUTLR

OUTLF

3.Pin Functions

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

SCL VCC OUTRR OUTRF TR B2R B1R IVR ILR QSR IDR Vref ICR CAP IBR IAR

2.Block Diagram

10 8 9 7 6

POWER

SUPPLY

16 15 13 11

SOURCE

SELECTOR

22 20 18 17

23 25 24 26 27 28

VOLUME 1

+20 to -31 dB

LOUDNESS

LEFT

VOLUME 1

+20 to -31 dB

LOUDNESS

RIGHT

BASS

LEFT

+15 dB

LOGIC

BASS RIGHT +15 dB

TREBLE

LEFT

+12 dB

TREBLE

RIGHT +12 dB

MUTE

FUNCTION

ZERO CROSS

DETECTOR

VOLUME 2

0 to 55 dB

BALANCE

FENDER REAR

VOLUME 2

0 to 55 dB

BALANCE

FENDER FRONT

HC BUS

REC

VOLUME 2

0 to -55dB BALANCE

FENDER FRONT

VOLUME 2

0 to -55dB BALANCE

FENDER REAR

Pin No.

Symbol

SDA

GND

OUTLR

OUTLF

B2L

B1L

IVL

ILL

QSL

IDL

MUTE

ICL

IMO

I/O

Serial data input/output.

I/O

Ground.

output left rear.

output left front.

Treble control capacitor left channel or

input from an external equalizer. Bass control capacitor leftchannel or

output to an external equalizer. Bass control capacitor left channel.

Input volume 1. left control part.

Input loudness. left control part.

Output source selector. left channel.

Not used

Input C left source.

Not used

Functions Functions

Pin No.

Symbol

IAR

IBR

CAP

ICR

Vref

IDR

QSR

ILR

IVR

B1R

B2R

OUTRF

OUTRR

I/O

Input A right source.

Input B right source.

Electronic filtering for supply.

Input C right source.

Reference voltage (0.5Vcc)

Not used

Output source selector right channel.

Input loudness right channel.

Input volume 1. right control part.

Bass control capacitor right channel Bass control capacitor right channel or

output to an external equalizer. Treble control capacitor right channel or

input from an external equalizer.

Output right front.

Output right rear.

1-14

IBL

IAL

Input B left source.

Input A left source.

Vcc

SCL

Supply voltage.

Serial clock input.

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