JVC KD-S871R User manual

SERVICE MANUAL
CD RECEIVER
No.49691
Feb. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
KD-S871R
KD-S871R
Contents
Safety precaution
Preventing static electricity
Important for laser products
Disassembly method
Adjustment method
1-2
1-3
1-4
1-5
1-12
Flow of functional
operation unit TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-13
1-15
1-15
1-16
--------------------------
---------------
-------------
----------------------
------------------------
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COMPACT
DIGITAL AUDIO
4
¢
SCMMODE
RNDRPTMO AM
FM
TP/PTY
SEL CD
DISP 87910 11 12
Area Suffix
EContinental Europe
EX---------Central Europe

1-2
KD-S871R
!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
!Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.

1-3
KD-S871R
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
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.
1.2. 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
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.
1.1.2. Ground yourself
1. Use an anti-static wrist strap to release any static electricity built up in your body.
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. 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.
FD screw
Feed motor ass’y
FD gear
Pickup unit
Shorting Short circuit land

1-4
KD-S871R
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.
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.
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.
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
DANGER : Invisibie laser
radiation when open and
interlock or defeated.
AVOID DIRECT EXPOSURE
TO BEAM (e)
VARNING : Osynlig laser-
strålning är denna del
är öppnad och spårren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suo-
jalukitus ohitettaessa olet
alttiina näkymättömälle
lasersäteilylle.Älä katso
säteeseen. (d)
ADVARSEL :Usynlig laser-
stråling ved åbning , når
sikkerhedsafbrydere er ude
af funktion. Undgå udsæt
telse for stråling. (f)
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.

1-5
KD-S871R
Press the eject button in the lower right part of the
front panel. Remove the front panel assembly from
the body.
1.
Removing the front panel assembly
(See Fig.1)
Prior to performing the following procedure, remove
the front panel assembly.
Release the four joint tabs aon both sides of the
front chassis assembly and remove the front chassis
assembly toward the front.
1.
Removing the front chassis assembly
(See Fig.2 and 3)
Disassembly method
<Main body>
Fig.1
Fig.2
Fig.3
Front panel assembly
Eject button
Tab a
Tab a
Front chassis assembly
Front chassis
assembly
Heat sink Tab a
Tab a

1-6
KD-S871R
Remove the three screws Aon the left side of the
body.
1.
Removing the heat sink (See Fig.4)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly
and the heat sink.
Turn over the body and unjoint the five joints bwith
the bottom cover and the body using a screwdriver.
1.
Removing the bottom cover
(See Fig.5 and 6)
Fig.4
Fig.5
Fig.6
Heat sink
A
Joints b
Joints b
Joint b
Joints b
Joints b
Joint b
Bottom cover
Bottom cover
Rear panel
Rear panel
A

1-7
KD-S871R
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink and the bottom cover.
Remove the screw B, the two screws C and the
three screws Dattaching the rear bracket on the
back of the body. Remove the rear panel.
Remove the two screws Eattaching the main board
on the bottom of the body. Disconnect connector
CN501 on the main board in the direction of the
arrow.
1.
2.
Removing the main board
(See Fig.7 and 8)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink, the bottom cover and the main board.
Remove the three screws Fattaching the CD
mechanism section on the back of the top chassis.
1.
Removing the CD mechanism section
(See Fig.9)
Fig.7
Fig.8
Fig.9
Rear panel
B
D
D
D
C
Main board
E
E
CN501
CD mechanism section
F
F
F
Top chassis
C

1-8
KD-S871R
Prior to performing the following procedure, remove
the front panel assembly.
Remove the four screws Gattaching the rear cover
on the back of the front panel assembly.
Unjoint the eleven joints cwith the front panel and
the rear cover.
Remove the control switch board on the back of the
front panel.
1.
2.
3.
Removing the control switch board
(See Fig.10 to 12)
Fig.10
Fig.11
Fig.12
G
GG
G
Rear cover
Front panel
Control switch board
Joints c
Joints c
Front panel
Rear cover
Joints c
Joints c

1-9
KD-S871R
Unsolder the part aand bon 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 Aattaching 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 dand the front bracket slot e.
Disconnect the flexible wire from connector on the
pickup unit.
1.
2.
3.
4.
5.
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:
Prior to performing the following procedure, remove
the CD mechanism control board.
Remove the two springs fattaching the CD
mechanism assembly and the front bracket.
Remove the two screws Band the front bracket
while pulling the flame outward.
Remove the belt and the screw Cfrom the loading
motor.
1.
2.
3.
Removing the loading motor
(See Fig.3 to 5)
<CD mechanism section>
Fig.2
Fig.3
Fig.4
Shift the lock
Flexible wire
Pickup unit
FD gear
CD mechanism control board
Loading motor Front bracket
Front bracket Pull outward
Pull outward
Flame
f
B
f
B
Fig.5
C
Loading motor
Belt
Fig.1
Front bracket CD mechanism
control board
Damper bracket
h
c
d
b
a
DD
D
CD mechanism assembly
Ae
h

1-10
KD-S871R
Prior to performing the following procedure, remove
the CD mechanism control board and the front
bracket (loading motor).
Remove the three screws Dand 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 assembly and the two
springs hattaching the flame.
Remove the two screws Eand both sides rear
damper brackets from the dampers. Detach the CD
mechanism assembly from the left side to the right
side.
1.
2.
3.
4.
Removing the CD mechanism assembly
(See Fig.1, 6 to 9)
The CD mechanism assembly can be
removed if only the rear damper
bracket on the left side is removed.
ATTENTION:
Fig.6
Fig.7
Fig.8
Fig.9
Rear damper bracket
Fix arm (R)
Damper
DD
Damper bracket
CD mechanism
assembly
Flame h
h
D
D
Fig.5
Front bracket CD mechanism
control board
Damper bracket
h
c
d
b
a
DD
D
CD mechanism assembly
Ae
Fix plate (L)
g
g
Rear damper bracket Fix arm (L)
Damper
E
Fix plate(R)
E
g
g
h

1-11
KD-S871R
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor) and the CD mechanism assembly.
Remove the two screws Fand the feed motor
assembly.
1.
Removing the feed motor assembly
(See Fig.10)
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor), the CD mechanism assembly and
the feed motor assembly.
Detach the FD gear part of the pickup unit upward.
Then remove the pickup unit while pulling out the
part iof the FD screw.
1.
Remove the screw Gattaching 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 pickup unit,
reattach the part jof the pickup unit,
then the part iof the FD screw.
ATTENTION:
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor), the CD mechanism assembly and
the feed motor assembly.
Turn up the CD mechanism assembly and remove
the two springs kon 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.
1.
2.
Removing the spindle motor
(See Fig.12 and 13)
Fig.10
Fig.11
Fig.12
Fig.13
Spindle motor
kk
Pickup unit
Part i
FD screw
Feed motor assembly
FD gear Pickup unit
Part j
F
Nut push spring plate
Pickup mount nut
Pickup unit
FD screw
G
H
H

1-12
KD-S871R
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(11V to 16V allowance)
Load impedance 4 (4 to 8 allowance)
Output Level Line out 2.0V / 20 k (full scale)
How to connect the extension cable for adjusting
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.
Standard volume position
Balance and Bass &Treble volume : lndication"0"
Loudness : OFF
BBE : OFF
Frequency Band
FM 87.5MHz ~ 108.0MHz
MW 522kHz ~ 1620 kHz
LW 144kHz ~ 279kHz
EXTGS004-26P
Doing such as cardboard puts finishing
between the main body and mechanism.

1-13
KD-S871R
Power ON
Set Function to CD
Play
Jump to the first track
TOC readout
Tracking loop closed
Disc rotates
Disc inserted
YES
YES
Laser emitted
Pickup feed to the inner area
Focus search
RF signal eye-pattern
opens
RF signal eye-pattern
remains closed
"No disc"
display
•When correctly focused
Focus Servo Loop ON
•When the laser diode correctly
emits
Microprocessor
commands
Rough Servo Mode
CLV Servo Mode
(ProgramArea)
CLV Servo Mode
(Lead-In Area;
Digital: 0)
•RF signal
Flow of functional operation untilTOC read
•When the pickup correctly moves
to the inner area of the disc
TERMINAL
Microprocessor
commands
FMO
TC9462 "53"
FEED MOTOR
+TERMINAL
IC581 "5"
REST SW
•When the disc correctly rotates
Tracking Servo Loop ON
Servo CLV
Rough
Servo
AccelerationAcceleration
Microprocessor
commands
Spindle
motor (-)
IC581 "7"
0.5 Sec 0.5 Sec

1-14
KD-S871R
Feed Section
Focus Section
Tracking Section
Spindle Section
Is the voltage output at
IC521 pin "53" 5V or 0V?
Check the feed motor.
Is 4V present at both
sides of the feed motor?
Is the wiring for IC521
(90) ~ (100) correct?
Check IC581.
Is 6V or 2V present at
IC581 "5" and "6"?
Is 5V present at IC581
pin "11"?
Check the feed motor
connection wiring.
Check the vicinity of
IC521.
Check CD 9V
and 5V.
YES
YES
YES
NONO
NO
NO
NO
YES
YES
When the lens is
moving: Check the circuits in
the vicinity of IC581
pins "15" ~ "18".
Check the pickup and
its connections.
NO
YES
YES
YES
Does the S-search
waveform appear at
IC581 pins "17" and "18"?
Is the disk rotated?
Does the RF signal
appear at TP1?
Is 4V present at IC581
pins "7" and "8" ?
Check the spindle motor
and its wiring.
Is 4V present at IC521
pin "55" ?
Check the vicinity of
IC581.
Check IC501 and
IC521.
YES
NO
NO
NO
NO NO
YES
YES
YES
Check the circuits in the
vicinity of IC501 "19" ~
"24" or the pickup
Is the RF waveform at TP1
distorted?
Proceed to the Tracking
section
When the disc is rotated
at first: Check the circuit in the
vicinity of IC501 pins
"2" ~ "12".
Check IC521.
Check the pickup and
its connections.
YESYES
YES
Is the tracking error signal
output at IC501 "12"?
Approx. 1.2 V
4V

1-15
KD-S871R
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.
Replacement of laser pickup
Is RF output
1.0 0.35Vp-p? Replace it.
NO
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.
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.

1-16
KD-S871R
UPD178078GF-561 (IC701) : System CPU
1.Pin layout
80 ~ 51
1 ~ 30
50
~
31
81
~
100
Pin
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
25
26
27
28
29
30,31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
-
I
I
O
O
-
I
O
O
-
O
O
O
-
O
I
I
I
I
I
I
I
I
I
I
-
I
-
-
-
-
-
-
-
I
-
I
-
-
I
-
I
-
NC
BUSINT
BUSSI
BUSSO
JBUS-SCK
NC
I2CDAI
I2CDAO
I2CCLK
NC
LCDDA
LCDSCK
BUSI/O
NC
LCODE
SW2
SW3
SW4
RESTSW
LED RED
LED BLUE
KEY0
KEY1
KEY2
LEVEL
AVDD
SM
SQ
NC
AVSS
REGCPU
VDD
REGOSC
X2
X1
GND0
SD/ST
GND2
NC
IFC
VDDPLL
OSC
NC
I/OSymbol FUNCTION
No use
JVC bus communication line
JVC bus communication line
JVC bus communication line
JVC bus communication line
No use
Serial data input
Serial data output
Serial clock output
No use
LCD driver serial data output
Serial data for LCD
JVC bus output select
No use
LCD driver communication line
CD mech switch
CD mech switch
CD mech switch
Traverse mech rest switch
Control red color
Control blue color
Key input
Key input
Key input
Audio level input
Power supply
Signal level meter input
Signal level meter input
No use
Connect to GND
Connect to GND with capacitor
Power supply
Connect to GND with capacitor
System clock
System clock
Connect to GND
Station detector & Stereo indicator
Connect to GND
No use
IF count input
---
FM,AM osc input
No use
2.Pin function (1/2)
Description of major ICs

1-17
KD-S871R
Pin
NO.
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61~68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89~98
99
100
-
O
O
-
I
I
I
-
-
O
O
O
-
-
-
-
O
O
O
O
I/O
I/O
I/O
I/O
O
I
I
I
-
-
O
O
O
-
O
-
-
-
-
GNDPLL
AMEO
FMEO
IC(VPP)
RESET
SW1
REMOCON
NC
TEL-MUTE
POWER
CDON
MUTE
STAGE 1
BUZZER
STAGE 2
NC
LM0
LM1
BUCK
CCE
BUS0
BUS1
BUS2
BUS3
RST
PS1
PS2
DETACH
RDSSCK
GND1
MONO
SEEK/STP
FM/AM
AFCK
RDSDA
PLLMONITOR
NC
VDDPORT
GNDPORT
I/OSymbol FUNCTION
---
PLL error output for AM
PLL error output for FM
Setting to write for flash
System reset
CD mech switch
Remocon input
No use
No use
Power control
CD power control
Mute control
Program control
No use
No use
No use
CD mech driver control
CD mech driver control
CD LSI communication line
CD LSI communication line
CD LSI communication line
CD LSI communication line
CD LSI communication line
CD LSI communication line
CD LSI communication line
ACC detection input
Memory detection
Detach detection
No use
Connect to GND
Mono by force
Switching SEEK & STOP
Band switch
No use
Antena regulator control signal
No use
Non connection
Vdd
Connect to GND
2.Pin function (2/2)
UPD178078GF-561

1-18
KD-S871R
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
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(IC301):Power amp
1.Block diagram

1-19
KD-S871R
2.Terminal layout
3.Pin function LA4743K
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

1-20
KD-S871R
VCC2
V05-
V05+
V04+
V04-
V03+
V03-
V02+
V02-
V01+
V01-
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(PNPTr
The outside putting)
22K
22K
22K
11K
11K
11K
CH1,2
Power supply
LA6567H-X(IC501):BTL driver
1.Pin layout & blockdiagram
Level shiftLevel shiftLevel shiftLevel shift
Thermal shutdown
Input
Signal system power supply