Jvc Kd-sx870 User manual

Safety precaution ------------------------------------- 1-2

1-4

1-5

1-10

1-11

Maintenance of laser pickup ----------------------- 1-13

Replacement of laser pickup ---------------------- 1-13

Description of major ICs ---------------------------- 1-14

Contents

CD RECEIVER

SERVICE MANUAL

KD-SX870

KD-SX770

No.49595

Feb. 2001

Area Suffix

J ... Northern America

KD-SX870

KD-SX770

...

Location of main parts -------------------------------

Disassembly method --------------------------------

Adjustment method ----------------------------------

Flow of functional operation unit TOC read ----

1-3

Preventing static electricity -------------------------

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1-2

KD-SX870

KD-SX770

!

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.

Safety precaution

!

CAUTION

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

adjustment or operation check.

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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.

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 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.

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. 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

Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

Shorted part

1-3

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Location of main parts

Control unit

Main unit

CD mechanism

Main board 16 pin connector

Power IC

Main board assembly

Loading motor

Damper

Spindle motor

Feed motor

Optical

pick up unit

Mechanism relay board

RCA jack

Connector to front PCB

Antenna

jack

Changer control

connector

Front PCB

Display

Tuner

pack

1-4

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Disassembly method

Removing the front chassis (See Fig.1)

1. Remove two screws A and 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.2 )

1. Remove the three screws B attaching the heat sink on

the left side of the body, and remove the heat sink.

Removing the bottom cover (See Fig.3 )

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.

Fig.1

Fig.2

Front chassis

b

a

b

Heat sink

B

Fig. 3

Regulator board

ed

c

A

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Removing the main amplifier board assembly

(See Fig.4 and 5)

1.

2.

3.

4.

5.

Remove the front chassis.

Remove the bottom cover.

Remove the two screws C attaching the main amplifier

board assembly on the bottom of the body.

Remove the three screws D 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.

Removing the CD mechanism assembly

(See Fig.6 )

1.

2.

3.

4.

Remove the front chassis.

Remove the bottom cover.

Remove the main amplifier board assembly.

Remove the three screws E attaching the CD mechanism

assembly from the top cover.

Removing the control switch board

(See Fig.7 and 8 )

1.

2.

3.

Remove the front chassis.

Remove the four screws F attaching the rear cover on the

back of the front panel unit.

Remove the control switch board from the front panel

unit.

Fig.4

Fig. 5

D

CD mechanism assembly

E

EE

Top cover

Fig. 6

C

CN501

Main amplifier board

F

Fig. 7

Fig. 8

Control switch board

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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).

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.

Removing the CD mechanism control

board(See Fig.1 and 2)

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).

ATTENTION:

Fig.1

Fig.2

Fig.3

Fig.4

Front bracket

CD mechanism

control board

Shift the lock

Flexible wire

Pickup unit

FD gear

CD mechanism control board

Loading motor Front bracket

Front bracket Pull outward

Pull outward

Flame

Damper bracket

mm

h

i

g

f

II

I

CD mechanism ass’y

Fj

k

G

k

G

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Prior to performing the following procedure, remove

the CD mechanism control board.

Remove the two springs k attaching the CD mechanism

ass’y and the front bracket.

Remove the two screws G and the front bracket

while pulling the flame outward.

Remove the belt and the screw H from the loading

motor.

1.

2.

3.

Removing the loading motor

(See Fig.3 to 5)

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.8 and 9.

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.

1.

2.

3.

4.

Removing the CD mechanism ass’y

(See Fig.1, 6 to 9)

The CD mechanism ass’y can be

removed if only the rear damper

bracket on the left side is removed.

ATTENTION:

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Rear damper bracket

Fix arm (R)

Damper

H

II

Loading motor

Belt

Damper bracket

CD mechanism ass’y

Flame m

m

I

Fix plate (L)

l

Rear damper bracket

Fix arm (L)

Damper

J

Fix plate(R)

J

l

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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.

1.

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), 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 n of the FD screw.

1.

Remove the screw L attaching the nut push spring

plate and the pickup mount nut from the pickup unit.

Pull out the FD screw.

2.

Removing the pickup unit

(See Fig.10 and 11)

When reattaching the pickuap unit,

reattach the part o of the pickup unit,

then the part n of the FD screw.

ATTENTION:

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 p on both sides of the clamper arms.

Open the clamper arm upward.

Turn the turn table, and remove the two screws M

and the spindle motor.

1.

2.

Removing the spindle motor

(See Fig.12 and 13)

Fig.10

Fig.11

Fig.12

Fig.13

Spindle motor

pp

Pickup unit

Part n

FD screw

Feed motor ass’y

FD gear Pickup unit

Part O

K

Nut push spring plate

Pickup mount nut

Pickup unit

FD screw

L

M

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1-10

Adjustment method

Test instruments required 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

Standard measuring conditions

Power supply voltage DC14.4V(10.5

–

16V)

Load impedance 4 (4 to 8 allowance)

Line-out Level/Impedance

KD-SX870 : 4.0 V/20k load(full scale)

KD-SX770 : 2.0 V/20k load(full scale)

Output impedance : 1k

How to connect the extension cable for adjusting

Standard volume position

Balance and Bass & Treble volume : Indication "0"

Loudness : OFF

FM

AM

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.

EXTGS004-26P

1 – 3 87.5MHz – 107.9MHz

530kHz – 1710kHz

Frequency Band

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1-11

KD-SX870

KD-SX770

When the pickup correctly moves

to the inner area of the disc

Microprocessor

commands

FMO

TC9462"53"

FEED MOTOR

+TERMINAL

IC501"10"

REST SW

When correctly focused

Focus Servo Loop ON

Power ON

Set Function CD

Disc inserted

Pickup feed to the inner area

YES

Laser emitted

Focus search

YES

Disc rotates

RF signal eye-pattern

remains closed

Tracking loop closed

RF signal eye-pattern

opens

TOC readout

Jump to the first track

Play

When the laser diode correctly

emits

Microprocessor

commands

SEL

TC9462

LD

CN501

"No disc"

display

When the disc correctly rotates

Microprocessor

commands

DMO

TC9462

Spindle

motor(-)

IC501"9"

Tracking Servo Loop ON

RF signal

Rough Servo Mode

CLV Servo Mode

(Program Area)

CLV Servo Mode

(Lead-In Area;

Digital: 0)

Flow of Functional Operation Unit TOC Read

$83 $82 $81

0V

6V

4V

2V

OFF

ON

5V

Hi-Z

FSO

TA2109 14

2.2V

$84

5V

0V

4V

0V

57

55

$84 $86 $ A200

5V

2.2V

0V

6V

3.2

2V

Rough

Servo

Acceleration Servo CLV

0.5 Sec0.5 Sec

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1-12

KD-SX870

KD-SX770

Feed section

Focus section

Spindle section

Tracking section

Is the voltage output at

IC541 pin "53" 5V or 0V? Is the wiring for IC541

(90)~(100) correct? Is 5V present at IC501

pin "20"?

Check CD 9V

and 5V.

Check the vicinity of

IC541.

Check the feed motor

connection wiring.

Is 6V or 2V present at

IC501 "10" and "11"?

Check IC501.

Is 4V present at both

sides of the feed motor?

Check the feed motor.

YES

NO YES NO

YES

NO

YES

YES YES

YES

YES YES

YES

When the lens is

moving:

4V

Does the S-search

waveform appear at

IC501 pins "6" and "7"?

Check the circuits in

the vicinity of IC501

pins "6","7"and"18".

Check the pickup and

its connections.

Is the disk rotated?

Does the RF signal

appear at TP1?

Is the RF waveform at TP1

distorted?

Proceed to the Tracking

section

Is 4V present at IC501

pins "8" and "9"?

Check the spindle motor

and its wiring

Check the circuits in the

vicinity of IC521 "19"~

"24" or the pickup

Is 4V present at IC541

pins "55" ?

Check IC521 and

IC541.

Check the vicinity of

IC501.

When the disc is rotated

at first:

Approx. 1.2V

Is the tracking error signal

output at IC521 "12"?

Check IC541.

Check the circuit in the

vicinity of IC521 pins

"2"~"12".

Check the pickup and

its connections.

NO

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1-13

KD-SX870

KD-SX770

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.

(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.

Is RF output

1.3 0.4Vp-p?

YES

NO

O.K

Replace it.

Replacement of laser pickup

Turn off the power switch and,disconnect the

power cord.

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.

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+-

+--+

+-

-

+

REFR

FILTER

8

9

10

1112

13

14

1234567

INR

NFR

FIL

NFLCL+ Vcc INL

CL- LGND OUTL OUTR RGND CR- CR+

17

8

3220

14

BA3220FV-X(IC341/IC441) : Line Out Amp

Description of major ICs

KD-SX870

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Vcc Vcc

Input

See Function Table

1A

2A

3A

4A

1C

2C

3C

4C

1Y

2Y

3Y

4Y

Output

Sample as Load Circuit 1

1k

S1

CL

Input Outout

C

L

H

A

X

L

H

Y

Z

H

L

1

2

3

4

5

6

7

14

13

12

11

10

9

8

HD74HC126FP-X (IC771) : Buffer

1.Terminal layout

2.Block diagram

3.Pin function

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6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

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22

12

23

11

33

34

44

1

BD3860K (IC301): Audio sound processor

Pin No. Symbol I/O Function

1 A2 I CH2 input pin A

2 B2 I CH2 input pin B

3 C2 I CH2 input pin C

4 D2 I CH2 input pin D

5 FIL - 1/2 VCC pin

6 GND - Ground pin

7 SI I Serial data receiving pin

8 SC I Serial clock receiving pin.

9 VCC - Power supply pin

10 OUTR2 O CH2 rear output pin

11 OUTF2 O CH2 front output pin

12 OUTR1 O CH1 rear output pin

13 OUTF1 O CH1 front output pin

14 BOUT1 O CH1 bass filter setting pin

15 BNF1 I CH1 bass filter setting pin

16 BOUT2 O CH2 bass filter setting pin

17 BNF2 I CH2 bass filter setting pin

18 TNF2 I CH2 treble filter setting pin

19 TNF1 I CH1 treble filter setting pin

20 TIN2 I CH2 treble input pin

21 BBOUT2 O CH2 BBE II signal output pin

22 MIX2 I CH2 output mix amplifier inverse input pin

23 VCA2 O CH2 high pass VCA output pin

24 LF2 I CH2 low pass filter setting pin

25 HF2 I CH2 high pass filter setting pin

26 DET2 I CH2 high pass attack/release time setting pin

27 DEF I BBE II on/off switching time constant pin

28 DET1 I CH1 high pass attack/release time setting pin

29 TIN1 I CH1 treble input pin

30 BBOUT1 O CH1 BBE II signal output pin

31 MIX1 I CH1 output mix amplifier inverse input pin

32 VCA1 O CH1 high pass VCA output pin

33 LF1 I CH1 low pass filter setting pin

34 HF1 I CH1 high pass filter setting pin

35 LOUD1 I CH1 loudness filter setting pin

36 VIN1 I CH1 main volume input pin

37 LOUD2 I CH2 loudness filter setting pin

38 VIN2 I CH2 main volume input pin

39 SEL2 O CH2 Input gain output pin

40 SEL1 O CH1 Input gain output pin

41 A1 I CH1 input pin A

42 B1 I CH1 input pin B

43 C1 I CH1 input pin C

44 D1 I CH1 input pin D

1.Terminal layout

3.Pin function

KD-SX870

KD-SX770

1-16

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

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POWER

SUPPLY INPUT

GAIN

Oto 18dB

MAIN

VOLUME

Oto -48dB

LOUDNESS

LO CONTOUR(f=100Hz) 5dB

PROCESS CONTROL +3to12dB

(f=10KHz)

TREBLE

-14to+14dB

BASS

-14to+14dB

LOGIC

INPUT

GAIN

Oto 18dB

MAIN

VOLUME

Oto -48dB

LOUDNESS

LO CONTOUR(f=100Hz) 5dB

PROCESS CONTROL +3to12dB

(f=10KHz)

TREBLE

-14to+14dB

BASS

-14to+14dB

INPUT

SELECTOR

FADER

CH1 FRONT

Oto -54dB

FADER

CH1 REAR

Oto -54dB

FADER

CH2 FRONT

Oto -54dB

FADER

CH1 REAR

Oto -54dB

27

8

7

12

10

11

13

1415

19

29

30

3132283334353640

956

44

43

42

41

1

3

2

4

16

17

18

202122

23

26

24

25

3738

39

SEL2 VIN2 LOUD2 HF2 LF2 DET2 VCA2 MIX2 BBOUT2

HF1 LF1 DET1 VCA1 MIX1 BBOUT1

SEL1 VIN1 LOUD1

TIN2 TNF2

TIN1 TNF1

BNF2 BOUT2

BNF1 BOUT1

OUTR1

S1

SC

DEF

OUOTF2

OUTR2

A2

B2

D2

C2

A1

B1

D1

C1

GND FIL VCC

3.Block diagram KD-SX870

KD-SX770

1-17

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-18

11

6 20

1

4

10

15

25

13

14

16

12

9

8

5

7

2

22

17

19

18

21

23

24

3

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

IN 1

IN 2

ST BY

Vcc 1/2 Vcc 3/4

OUT 1+

OUT 1-

PWR GND1

OUT 2+

OUT 2-

PWR GND2

R.F

IN 3

IN 4

PRE GND

ON TIME C Muting &

ON Time Control

Circuit

Protective

circuit

Protective

circuit

Mute

circuit

Ripple

Filter

Stand by

Switch

N.C

+

0.22 F

2200 F 0.022 F

0.22 F

TAB

+5V

ST ON

+

47 F

0.22 F

22 F

+

Mute 10K

+

3.3 F

OUT 3+

OUT 3-

Low Level

Mute ON

PWR GND3

OUT 4+

OUT 4-

PWR GND4

LA4743K(IC351):Power AMP

1.Block diagram

KD-SX870

KD-SX770

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

2.Terminal layout

3.Pin function

KD-SX870

KD-SX770

1-19

TAB

GND

OUTRR-

STBY

OUTRR+

VCC1/2

OUTRF-

GND

OUTRF+

RIPPLE

INRF

INRR

SGND

INLR

INLF

ONTIME

OUTLF+

GND

OUTLF-

VCC3/4

OUTLR+

MUTE

OUTLR-

GND

NC

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

SymbolPin No. Function

Header of IC

Power GND

Outpur(-) for front Rch

Stand by input

Output (+) for front Rch

Power input

Output (-) for rear Rch

Power GND

Output (+) for rear Rch

Ripple filter

Rear Rch input

Front Rch input

Signal GND

Front Lch input

Rear Lch input

Power on time control

Output (+) for rear Lch

Power GND

Output (-) for rear Lch

Power input

Output (+) for front

Muting control input

Output (-) for front

Power GND

Non connection

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

VCC2

VO5-

VO5+

VO4+

VO4-

VO3+

VO3-

VC2+

VO2-

VO1+

VO1-

VCC1

VIN1

VIN1G

FR

REV

FWD

S-GND

VCONT

VIN4

VIN4G

VCC-S

VREF-IN

REG-OUT

REG-IN

VIN3G

VIN3

VIN2G

VIN2

FR

28

27

26

25

24

23

22

21

20

19

18

17

16

15

FR

1

2

3

4

5

6

7

8

9

10

11

12

13

14

FR

CH 3,4,5

Power supply

Output control

CH5

CH4

CH2

CH1

CH3

22K 11K

5VREG(PNPT

22K

11K

CH1,2

LA6567H-X(IC581):CD DRIVE

1.Pin layout & blockdiagram

Level shiftLevel shiftLevel shiftLevel shift

Thermal shutdown

Input

Signal system power supply

KD-SX870

KD-SX770

1-20

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

JVC KD-SX870 User manual

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