JVC KD-SH77R User manual

SERVICE MANUAL
CD RECEIVER
No.49634
Mar. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
KD-SH77R/KD-SH55R
KD-SH77R/KD-SH55R
Area Suffix
E
EX
Continental Europe
Central Europe
Difference
point
KD-SH77R
KD-SH55R
DVD
control
O
X
LINE IN
O
X
SUBWOOFER
OUT
O
X
EXT OUT
O
X
Contents Safety precaution
Preventing static electricity
Disassembly method
Adjustment method
Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-2
1-3
1-4
1-15
1-17
1-19
1-19
1-20~35
KD-SH77R
KD-SH55R
ANGLE
RM-RK100
EQ
CD
FM
AM
CH
AUX SEL
VOLUME
R D
AT T

KD-SH77R/KD-SH55R
1-2
!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.

KD-SH77R/KD-SH55R
1-3
Front bracket
CD mechanism
control board
Damper bracket
CD mechanism ass’y
FD screw
Feed motor ass’y
FD gear Pickup unit
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.
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
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Soldering
Attention when traverse unit is decomposed
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.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.

KD-SH77R/KD-SH55R
1-4
Press the release button in the lower right part of the
front panel assembly to unlock.
Remove the front panel assembly in the direction of
the arrow.
1.
2.
Disassembly method
Removing the front panel assembly
(See Fig.1)
Turn on power.
Press the eject button in the upper left part of the
front panel assembly to move the assembly as
shown in Fig.2 and turn off power.
Remove the two screws Aon the upper side of the
body.
1.
2.
Removing the top chassis
(See Fig.2 to 6)
Fig.1
Fig.2
Front panel assembly
Release button
Front panel assembly
Eject button
Top chassis
Fig.3
Front panel assembly
Top chassis
AA

KD-SH77R/KD-SH55R
1-5
Remove the three screws B on both sides of the
body.
Remove the screw Cand the three screws Don the
left side of the body.
Remove the two screws Eand the screw Fon the
back of the body.
Move the top chassis upward and remove it with the
CD mechanism assembly. The connector on the CD
mechanism assembly is disconnected from
connector CN601 on the main board.
3.
4.
5.
6.
Fig.6 (KD-SH55RE)Fig.6 (KD-SH77RE)
Fig.4
Fig.5
BB
Top chassis
Top chassis
BD
C
EFEF
Heat sink

KD-SH77R/KD-SH55R
1-6
Prior to performing the following procedure, remove
the top chassis.
Remove the three screws Ginside the top chassis
and remove the CD mechanisma ssembly.
1.
Removing the CD mechanism assembly
(See Fig.7)
Prior to performing the following procedure, remove
the top chassis.
Disconnect the wire from connector CN703 on the
main board.
Remove the motor bracket and the spring attached
to the arm braket assembly (R).
Remove the two screws Hattaching the motor
bracket.
Remove the washer attaching the clutch assembly
and pull out the clutch assembly from the shaft.
Remove the two screws Iand the motor assembly
from the motor bracket.
1.
2.
3.
4.
5.
Removing the motor assembly
(See Fig.8 to 10) Fig.7
Fig.8
Fig.9
Fig.10
Top chassis G
G
G
CD mechanisma ssembly
Arm braket assembly (R)
Motor assembly
Motor braket
Spring
Motor assembly
Motor braket
Motor braket
CN601
CN703
H
H
Main board
R
Clutch assembly
Washer

KD-SH77R/KD-SH55R
1-7
Prior to performing the following procedures, remove
the top chassis and the motor bracket.
Disconnect the flexible wire from connector CN701
and CN702 on the main board respectively.
Move the front bracket backward until it stops.
Remove the four screws Jattaching the arm
brackets (L) and (R). Move the right and arm lefter
brackets from the rod gear.
Remove the rod gear.
Remove the screw Kattaching the rear panel to the
bottom cover on the back of the body.
1.
2.
3.
4.
5.
Removing the main board
(See Fig.11 to 15)
Fig.13 (KD-SH55RE)Fig.13 (KD-SH77RE)
Fig.12
Fig.11
Main board
LL
J
J
J
Arm
brackets (L)
Arm
brackets (R)
CN701 CN702 Rod gear
Arm brackets (L)
Arm brackets (R)
Main board
Rod gear
Bottom cover
Bottom cover
KK
Rear panel Rear panel

KD-SH77R/KD-SH55R
1-8
Remove the two screws Land move the main board
backwards to release the two joints a. (The main
board will be removed with the rear panel and the
rear heat sink)
Remove the screw Mand Nattaching the rear heat
sink.
Remove the two screws Oand the screw P
attaching the rear panel. Remove the mainboard
(KD-SH55RE).
Remove the three screws Oand the screw P
attaching the rear panel. Remove the main board
(KD-SH77RE).
6.
7.
8.
9.
Prior to performing the following procedures, remove
the top chassis, the motor bracket and the main
board.
Remove the two screws Qattaching the lifter switch
board.
1.
Removing the lifter switch board
(See Fig.16)
Fig.15 (KD-SH55RE)Fig.15 (KD-SH77RE)
Fig.14
Fig.16
Joint a
Joint a Main board
Rear panel Rear panel
OOM
M
NN
P
PRear heat sink
Rear heat sink
Bottom cover
Lifter switch board
Q

KD-SH77R/KD-SH55R
1-9
Prior to performing the following procedure, remove
the top chassis assembly and thefront panel
assembly.
Disconnect the flexible wire from connector CN702
on the main board.
Remove the four screws Rattaching the front
bracket on both sides of the body.
Push the pin of the joint con the front of the front
bracket to release the lock lever.
1.
2.
3.
Removing the lifter board
(See Fig.17 to 23)
Fig.17
Fig.18
Fig.19Fig.20
Front bracket
Main board
CN702
Front bracket
Front bracket
R
R
Lock lever
Front bracket
Joint c

KD-SH77R/KD-SH55R
1-10
Remove the screw Sattaching the lifter board cover
in the rear of the front bracket.
Release the two joints dwhile pushing the front side.
Move the lifter board cover inthe direction of the
arrow and release the eight joints e.
Remove the two screws Tattaching the lifter board
on the front of the body.
4.
5.
6.
Fig.21
Fig.22
Fig.23
Joints e
Joints e
Joints e
Joint e
S
Joint d
Joint d
Front bracket
Lifter board cover
Lifter board
Lifter board cover
T

KD-SH77R/KD-SH55R
1-11
Remove the four screws Uattaching the rear panel
to the front panel assembly.
Release the eleven joints fof the front panel and the
rear panel.
Disconnect the wire from connector CN503 on the
front board.
If necessary, unsolder connector CN502 on the front
board.
1.
2.
3.
4.
<Front panel assembly>
Removing the front board
(See Fig.24 and 25)
Prior to performing the following procedure, remove
the rear panel.
Remove the two screws Wattaching the volume
board.
Disconnect the volume knob, ring lens and volume
ring from the volume board.
If necessary, unsolder the volume board.
1.
2.
3.
Removing the volume board
(See Fig.25 and 26)
Prior to performing the following procedure, remove
the rear panel.
Disconnect the wire from connector CN503 on the
front board.
Pull out the line in board from the front panel
assembly.
1.
2.
Removing the line in board
(See Fig.25 and 27)
Prior to performing the following procedure, remove
the front panel assembly.
Fig.24
Fig.25
Fig.26
Fig.25
Joint f 11
Rear panel
U
U
U
U
Front board Soldering
(CN502)
Soldering
Volume board
W
W
V
V
CN503
Line in board
Rng knob
Volume lens, Volume ring
Volume board
Line in board

KD-SH77R/KD-SH55R
1-12
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

KD-SH77R/KD-SH55R
1-13
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.1
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

KD-SH77R/KD-SH55R
1-14
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

KD-SH77R/KD-SH55R
1-15
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 KD-SH77R Line out 4.0V (Vol. MAX)
KD-SH55R Line out 2.0V (Vol. MAX)
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

KD-SH77R/KD-SH55R
1-16
<ERROR CODE of Panel mechanism>
Memory to EEPROM of 6 digits, 1st and 2nd digit are indicate the operation mode when occur the error,
3rd to 6th digit are indicate details of error.
LCD indication time is use lower 2digits of details of error.
This series is indicate ERR XX (XX is error code).
<ex.> When details of error is 0A0001 , it is indicate ERR 01, details of error is 0E0031 , it is ERR 31.
Switch is from this side sequentially PSW1, PSW2,.....PSW6.
Details of error Error code
1. Error of door open (fault of PSW1)
(1) Time out by PSW1 not changed
(2) PSW1 change during waiting 300ms after open position detected
2. Error of door close (fault of PSW6)
(1) Time out by PSW6 not changed
(2) PSW6 change during waiting 300ms after close position detected
3. Error of shift to DETACH position (fault of PSW5)
(1) Time out by PSW5 not changed to open side
(2) Shift to open side, pass the DETACH position then detect ANGLE1
(3) Time out by PSW5 not changed to close side
(4) Shift to close side, pass the DETACH position then detect close position
4. Error of angle adjustment
4-1 Shift to ANGLE1 (fault of PSW4)
(1) Time out by PSW4 not changed to shift for open side
(2) Shift to open side, pass the ANGLE1 then detect ANGLE2
(3) Time out by PSW4 not changed to shift for close side
(4) Shift to close side, pass the ANGLE1 then detect DETACH position
4-2 Shift to ANGLE2 (fault PSW3)
(1) Time out by PSW3 not change to shift for open side
(2) Shift to open side, pass the ANGLE2 then detect ANGLE3
(3) Time out by PSW3 not changed to shift for close side
(4) Shift to close side, pass the ANGLE2 then detect ANGLE1
4-3 Shift to ANGLE3 (fault PSW2)
(1) Time out by PSW2 not changed to shift for open side
(2) Shift to open side, pass the ANGLE3 then detect OPEN position
(3) Time out by PSW2 not changed for shift for close side
(4) Shift to close side, pass the ANGLE3 then detect ANGLE2
5. PSW fault condition at initialize
When all PSW is checked immediately after RESET, and the state of SWITCH which
cannot be originally is detected, it is displayed as ERR 00.
0A0001
0A0002
0B0006
0B0007
0C0011
0C0012
0C0013
0C0014
0D0021
0D0022
0D0023
0D0024
0E0031
0E0032
0E0033
0E0034
0F0041
0F0042
0F0043
0F0044
000000

KD-SH77R/KD-SH55R
1-17
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 until TOC 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

KD-SH77R/KD-SH55R
1-18
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

KD-SH77R/KD-SH55R
1-19
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.

KD-SH77R/KD-SH55R
1-20
TC9490FA (IC621) : DSP
1. Pin layout & Block diagram
2. Pin function (1/2)
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
O
O
O
O
O
-
-
O
I/O
O
O
O
O
O
-
O
O
I
O
-
O
-
O
I
-
Bit clock output pin.32fs, 48fs, or 64fs selectable by command.
L/R channel clock output pin. "L" for L channel and "H" for R channel.
Audio data output pin. MSB-first or LSB-first selected by command.
Digital data output pin. Outputs up to double-speed playback.
Correction flog output pin.
Digital 3.3V power supply voltage pin.
Digital GND pin.
Subcode Q data CRCC result output pin. "H" level when result is OK.
Sub-code P-W data read clock I/O pin. I/O polarity selectable by command.
Sub-code P-W data output pin.
Playback frames sync signal output pin.
Sub-code block sync output pin.
Playback speed mode flag output pin.
Playback speed mode flag output pin.
PLL-only 3.3V power supply voltage pin.
EFM and PLCK phase difference signal output pin.
TMAX detection result output pin.
Inverted input pin for PLL RF amp.
Output pin for PLL LPF amp.
PLL-only VREF pin.
VCO filter pin.
Analog GND pin.
DAC output pin for data slice level generation.
RF signal input pin.
Analog 3.3V power supply voltage pin.
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
No. Symbol I/O Function
49DV
DV
SS3
VSS5
VDD5
DD3
DD3
RO
VDD3
VSS3
PVDD3
BCK
LRCK
AOUT
DOUT
IPF
SBOK
CLCK
DATA
SFSY
SBSY
/HSO
/UHSO
PDO
DVR
LO
ZDET
BUS0
BUS2
BUS3
BUCK
/CCE
/RST
BUS1
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
DV
32 TEZI
TEI
SBAD
FEI
RFRP
RFZI
RFCT
RFI
SLCO
VCOF
LPFO
LPFN
TMAX
AV DD3
AV SS3
PVREF
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
XO XI TESIN DMO FMO SEL TEBC RFGC TRO FOO XVDD3 XVSS3 AV DD3 VDD3 VSS3 VREF
Clock
generator
LPF
1-bit
DAC
16 k
RAM
Address
circuit
Correction
circuit
Audio output
circuit
Micro-
controller
interface
Digital output
Sub code
decoder
PLL
TMAX
VCO
Sync signal
protection
EFM
CLV servo Data
slicer
A/D
D/A
Servo control
ROM
RAM
Digital equalizer
automatic
adjustment circuit
PWM
Description of major ICs