Jvc KD-SH99 Service Manual
SERVICE MANUAL
CD RECEIVER
KD-SH99
J Northern America
KD-SH99
Area Suffix
Detachable
Contents
Safety precaution
Preventing static electricity
Disassembly method
Adjustment method
Flow unit reading TOC
of CD/CD-R/CD-RW
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1- 2
1- 3
1- 4
1-15
1-18
1-20
1-20
1-21~44
ATT
ANGLE
CD
DAB
FM
PRESET
AM
CH
AUX SEL
RM-RK100
EQ
DISC
PRESET
R D
DISC
VOLUME
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
No.49643
Jun. 2001
KD-SH99
Safety precaution
!
!
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-SH99
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-SH99
Disassembly method
Removing the front panel assembly
(See Fig.1)
1.
Press the release button in the lower right part of the
front panel assembly to unlock.
2.
Remove the front panel assembly in the direction of
the arrow.
Removing the top chassis
(See Fig.2 to 6)
Turn on power.
1.
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.
Front panel assembly
Front panel assembly
Eject button
Release button
Fig.1
Top chassis
2.
Remove the two screws A on the upper side of the
body.
Top chassis
A
Front panel assembly
Fig.2
A
Fig.3
1-4
3.
Remove the three screws B on both sides of the
body.
4.
Remove the screw C and the three screws D on the
left side of the body.
5.
Remove the two screws E and the screw F on the
back of the body.
6.
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.
KD-SH99
Top chassis
BB
Fig.4
Top chassis
C
Heat sink
E
BD
Fig.5
F
Fig.6
1-5
KD-SH99
Removing the CD mechanism assembly
(See Fig.7)
Prior to performing the following procedure, remove
the top chassis.
1.
Remove the three screws G inside the top chassis
and remove the CD mechanisma ssembly.
Removing the motor assembly
(See Fig.8 to 10)
Prior to performing the following procedure, remove
the top chassis.
1.
Disconnect the wire from connector CN703 on the
main board.
2.
Remove the motor bracket and the spring attached
to the arm braket assembly (R).
Top chassis
G
Spring
G
G
CD mechanisma ssembly
Fig.7
Motor braket
3.
Remove the two screws H attaching the motor
bracket.
4.
Remove the washer attaching the clutch assembly
and pull out the clutch assembly from the shaft.
5.
Remove the two screws I and the motor assembly
from the motor bracket.
Motor braket
Clutch assembly
Motor assembly
Motor assembly
Arm braket assembly (R)
Fig.8
Main board
CN703
CN601
H
Motor braket
H
1-6
Washer
Fig.10
R
Fig.9
Removing the main board
(See Fig.11 to 15)
Prior to performing the following procedures, remove
the top chassis and the motor bracket.
1.
Disconnect the flexible wire from connector CN701
and CN702 on the main board respectively.
2.
Move the front bracket backward until it stops.
3.
Remove the four screws J attaching the arm
brackets (L) and (R). Move the right and arm lefter
brackets from the rod gear.
4.
Remove the rod gear.
5.
Remove the screw K attaching the rear panel to the
bottom cover on the back of the body.
J
Arm
brackets (L)
J
CN701
L
CN702
Main board
Fig.11
KD-SH99
L
Arm
brackets (R)
J
Rod gear
Arm brackets (R)
Arm brackets (L)
Main board
Rod gear
Fig.12
Rear panel
K
Fig.13
Bottom cover
1-7
KD-SH99
6.
Remove the two screws L and 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)
7.
Remove the screw M and N attaching the rear heat
sink.
8.
Remove the three screws O and the screw P
attaching the rear panel. Remove the main board.
Joint a
Joint a
Main board
Fig.14
Removing the lifter switch board
(See Fig.16)
Prior to performing the following procedures, remove
the top chassis, the motor bracket and the main
board.
O
Rear panel
Lifter switch board
P
N
M
Rear heat sink
Fig.15
Bottom cover
1.
Remove the two screws Q attaching the lifter switch
board.
1-8
Q
Fig.16
KD-SH99
Removing the lifter board
(See Fig.17 to 23)
Prior to performing the following procedure, remove
the top chassis assembly and thefront panel
assembly.
1.
Disconnect the flexible wire from connector CN702
on the main board.
2.
Remove the four screws R attaching the front
bracket on both sides of the body.
3.
Push the pin of the joint c on the front of the front
bracket to release the lock lever.
Main board
CN702
Front bracket
Fig.17
Front bracket
Front bracket
R
Fig.18
Joint c
Front bracket
Lock lever
R
Fig.19Fig.20
1-9
KD-SH99
4.
Remove the screw S attaching the lifter board cover
in the rear of the front bracket.
5.
Release the two joints d while pushing the front side.
Move the lifter board cover inthe direction of the
arrow and release the eight joints e.
Joint d
Joints e
Lifter board cover
Joints e
Joint d
6.
Remove the two screws T attaching the lifter board
on the front of the body.
S
Joints e
Lifter board
Joint e
Front bracket
Fig.21
Lifter board cover
Fig.22
1-10
Fig.23
T
KD-SH99
<Front panel assembly>
Prior to performing the following procedure, remove
the front panel assembly.
Removing the front board
(See Fig.24 and 25)
1.
Remove the four screws U attaching the rear panel
to the front panel assembly.
2.
Release the eleven joints f of the front panel and the
rear panel.
3.
Disconnect the wire from connector CN503 on the
front board.
4.
If necessary, unsolder connector CN502 on the front
board.
Removing the volume board
(See Fig.25 and 26)
Prior to performing the following procedure, remove
the rear panel.
U
Line in board
U
Joint f 11
Front board
V
Rear panel
Fig.24
Soldering
(CN502)
CN503
Fig.25
Soldering
W
V
U
U
Volume board
W
1.
Remove the two screws W attaching the volume
board.
2.
Disconnect the volume knob, ring lens and volume
ring from the volume board.
3.
If necessary, unsolder the volume board.
Removing the line in board
(See Fig.25 and 27)
Prior to performing the following procedure, remove
the rear panel.
1.
Disconnect the wire from connector CN503 on the
front board.
2.
Pull out the line in board from the front panel
assembly.
Volume board
Volume lens, Volume ring
Rng knob
Fig.26
Line in board
Fig.25
1-11
KD-SH99
<CD mechanism section>
Removing the CD mechanism control
board (See Fig.1 and 2)
1.
Unsolder the part a and b on the CD mechanism
control board.
2.
Remove the stator fixing the CD mechanism control
board and the damper bracket (To remove the stator
smoothly, pick up the center part).
3.
Remove the screw A attaching the CD mechanism
control board.
4.
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.
5.
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)
CD mechanism assembly
D
h
Front bracket
Pickup unit
Damper bracket
D
A
Fig.1
e
b
Flexible wire
a
h
c
D
d
CD mechanism
control board
Shift the lock
Removing the loading motor
(See Fig.3 to 5)
Prior to performing the following procedure, remove
the CD mechanism control board.
1.
Remove the two springs f attaching the CD
mechanism assembly and the front bracket.
2.
Remove the two screws B and the front bracket
while pulling the flame outward.
3.
Remove the belt and the screw C from the loading
motor.
Loading motor
C
FD gear
f
B
Loading motor
Pull outward
Fig.2
CD mechanism control board
f
B
Front bracket
Fig.3
Front bracket
Pull outward
1-12
Fig.5
Belt
Flame
Fig.4
KD-SH99
Removing the CD mechanism assembly
(See Fig.1, 6 to 9)
Prior to performing the following procedure, remove
the CD mechanism control board and the front
bracket (loading motor).
1.
Remove the three screws D and the damper
bracket.
2.
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.
3.
Remove the CD mechanism assembly and the two
springs h attaching the flame.
4.
Remove the two screws E and both sides rear
damper brackets from the dampers. Detach the CD
mechanism assembly from the left side to the right
side.
ATTENTION:
The CD mechanism assembly can be
removed if only the rear damper
bracket on the left side is removed.
CD mechanism
h
Front bracket
CD mechanism
D
Flame
assembly
D
assembly
h
D
Damper bracket
D
A
Fig.1
e
b
Damper bracket
D
Fig.6
a
h
c
D
d
CD mechanism
control board
h
Fix plate (L)
g
Fix arm (R)
D
Fig.7
Rear damper bracket
g
Fig.8
Rear damper bracket
E
Fix plate(R)
E
Fix arm (L)
Damper
Damper
g
g
Fig.9
1-13
KD-SH99
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) and the CD mechanism assembly.
1.
Remove the two screws F and the feed motor
assembly.
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 assembly and
the feed motor assembly.
1.
Detach the FD gear part of the pickup unit upward.
Then remove the pickup unit while pulling out the
part i of the FD screw.
Feed motor assembly
F
FD gear
Nut push spring plate
FD screw
Pickup unit
Fig.10
Part i
Part j
Pickup unit
G
Pickup mount nut
Pickup unit
ATTENTION:
2.
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 j of the pickup unit,
then the part i of the FD screw.
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 assembly and
the feed motor assembly.
1.
Turn up the CD mechanism assembly and remove
the two springs k on both sides of the clamper arms.
Open the clamper arm upward.
2.
Turn the turn table, and remove the two screws H
and the spindle motor.
k
FD screw
Spindle motor
Fig.11
k
Fig.12
H
1-14
H
Fig.13
Adjustment method
KD-SH99
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(11 V to 16V allowance)
Load impedance 4 (4 to 8 allowance)
Line-Out Level/Impedance 4.0V/20k load(fuull scall)
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 ~107.9MHz
FM 87.5MHz 108.0 MHz
AM 530kHz ~ 1710 kHz(with channel interval set to 10kHz)
AM 531 kHz 1602 kHz(with channel interval set to 9 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.
(with channel interval set to 200kHz)
(with channnel interval set to 50kHz)
EXTLX003-20PC
EXTLX003-7PC
EXTLX003-20P
EXTGS004-26P
EXTLX003-7P
EXTLX003-2P
1-15
KD-SH99
< Service mode >
The menu in the service mode can be switched with UP/DOWN.
The menu selected by the SEL button input is executed.
The ordinary mode
"UP" + "DOWN" + VR counterclockwise rotation.
DEL EEPROM EEPROM data all clear (changer is connected).
CH CH ERR CD changer error career call (changer is connected).
DELL CH ERR CD changer EEPROM clear (EEPROM career)
RUNNING CD CD running mode (Do not use in service).
RUNNING SH Running mode of front panel (Do not use in service).
DEL DATA CD ERROR MECHA ERR error career deletion.
CD ADJ R Self adjustment value call (It is a display switch with VR).
MEKACON WR Sub-microcomputer writing (Do not use in service).
TEMP DATA Temperature data call.
VERSION Microcomputer version confirmation.
The display changes in the up/down key.
The main microcomputer : SH99 J203
The Sub-microcomputer : SH99S 122
CD ERROR CD relation error career reading
< Error display >
Item Content
DISC_ERROR_0
DISC_ERROR_1
DISC_ERROR_2
DISC_ERROR_3
DISC_ERROR_4
DISC_ERROR_5
EJECT_ERR
Others
FOCUS NG
Self adjustment NG
CLV NG
TOC reading NG
or
MP3 FILE CHECK NG
BLANK DISC
1-16
MECHA ERR Panel relation error career reading
<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-SH99
1-17
KD-SH99
Flow until reading TOC of CD/CD-R/CD-RW
FEED RETURN
OFFSET SELF ADJUSTMENT
LASER ON
Pre SP KICK
LENS UP
FOCUS ON
THE SPINDLE START
TRAKING BALANCE
RF GAIN
FOCUS GAIN
TRACKING
TOC READING
Becomes DRVMUTE=H and the output of the IC604 driver becomes possible.
Picking up is moved to surroundings on the inside until becoming REST SW=L.
Afterward, moves in the direction of outer again and stops in the place in which
became REST SW=H.
FOCUS OFFSET, TRACKING OFFSET, and RF OFFSET are done, and
OFFSET of RF AMP in IC603 is corrected.
400ms turns the spindle motor before the focus search starts.
Lens UP of the pick is done. At this time, S character curve becomes about
2.0Vp-p by CTS-1000.
The down of the lens and FOCUS ONing are made.
Changes into CD-RW MODE, and serches for FOCUS in case of no FOCUS ON
even if FOCUS search(UP DOWN) is done three times.
The spindle motor is rotated up to the number of necessary rotations.
In the state of tracking OFF, do the self adjustment of wavy OFFSET of TE2 to 0.
It takes time to adjust the one with a large gap of the traking balance of picking up.
At this time, the racking error becomes about 2.8Vp-p by CTS-1000.
In the state of traking OFF, do the self adjustment of the RF level of RF(TP601)
to 1.0-1.2Vp-p. After adjusts,traking ON is done.
Do th eself adjustment of the gain intersection of the focus servo to 1.2kHz
(300ms).
Do the self adjustment of the gain intersection of the focus servo to 1.2kHz.
(300ms).
Time expands in DISC that the number of total tracks with CD-TEXT is a lot of.
1-18
1Tr. HEAD
TP603
TE2
TP605
FEED
TP634
SP0
TP636
It is a head of 1Tr., and the reproduction begins.
Shape of waves when based on Vref(TP602)
FE
2.0Vp-p
2.8Vp-p
FE : Focus error signal
TE : T Tracking error signla
FEED : FEED deive signal
SPO : Spindle drive signal
Adjustment part
KD-SH99
IC941
C143
C144
TE2
TE
FE
C142
C944
D942
FOD
R630
C632 C633
C635
C631
C634
C636
C630
C629
R629
R636
C626
C628
R942
Q941
C637
R637
C678
C841
R876
C860
R134
C308
R941
R944
C622
R620 R621
C620 C621
C623
C627
C625
C624
C638
X602
R678
C677
C614
C615
IC603
R634
C680
C616
CN601
R677
C945
R853
R661
R695
R696
C639
C304
IC607
C307
R687
R688
R689
R855
R627
C641
X603
C302
R647
C643
R643
R857
R856
C642
C301
R690
C640
R697
R694
C305
R691
R698
C303
R667
R699
R665
R666
R668
R669
C669
R663
C687
R693
R676
TRD
C913
C686
R840
R839
IC606
R624
R838
R672
R673
R674
R675
R877
SPO
IC604
C676
C651
R662
C679
R633
X602
R619
R639
R651
R654
R650
R631
R644
R652
C351
C350
Q683
IC605
R655
IC803
C916
R211
C653
R649
IC805
R642
C450
R653
IC806
R659
C852
C851
R658
R111
R660
R641
C952
L622
R656R657
C161
C451
C654
IC804
C352
C321
FEED
C961
D402
D412
D416
D408
D401
C948
C947
C943
C941
C946
C949
C927
C141
IC941
C944
C143
C144
D942
L961
CN901
C926
C921C922
C924
C244
R244
C243
C142
CN301
CN302
D961
R977
C968
R978
C329
D332
R231
R232
C928
D410
D414
R337
R976
C408
D967
Q232
R131
D962
Q132
Q131
Q231
R132
C409
C272
D231
B1
IC401
R233
C404
C172
R243
R237
C323
C407
C410
R238
D131
C405
B2
C273
R234
IC171
R277
C173
C401
C403
C241 C242
C220
R220
C402
C406
C309
R137
R143
C306
R120
R138
R133
C917
C120
C310
IC301
R144
C912
R134
C302
C308
R942
C304
C305
R877
Q941
C307
R941
C301
C303
C945
R624
R944
C913
C622
R620R621
C643
C620C621
CN601
C651
IC604
C623
R643
C626
C627
R627
R647
C687
C686
R857
R687
R688
R856
R840
C625
R689
R695
R855
R663
R691
R696
C641
R690
R661
C629
IC603
C630
R662
R693
C624
R694
R633
C642
R630
X602
C628
R629
R697
R698
C679
R619
C676
C631
C632 C633
R699
R665
R666
R672
C637
C635
R839
R673
R669
R674
R838
C669
R675
IC606
R667
R668
C640
C634
R676
C636
X603
C638
R636
C639
R637
CN701
R679
R686
IC602
R680
R685
R681
R684
R682R683
IC601
D723
D724
D725
D726
D727
D728
D729
C721
D730
C722
C725
R933
R930
R923
R932
R924
R931
D914
D912
D722
C723
D721
CN702
C724
D796
CN771
IC961
C964
R963
C967
R962
Q755
R961
C330
R343
R436
R336
D701
C331
R344
C969
R325
R328
R331
C328
C327
R327
Q983
C971
R437
R340
C962
R329
Q35
R964
C965
C986
IC323
C977
D986
X51
C982
IC322
C332
R341
C334
C333
C978
R332
R342
R330
C325
C910
C175
R854
C452
IC911
C915
L852
R851
L851
R833
R911
R834
C203
C817
C818
D964
C450
C451
C103
C57
C163
R162
C25
D161
R164
D111
R163
D162
R161
PP2
R631
R644
C916
R617
R954
C321
C352
C351
R625
C951
C650
R645
IC951
R615
R618
C952
C350
R616
R111
R817
R813
C657
C811
R811
C164
C804
R823
C655
C656
C809
R211
R827
C653
C821
R821
R822
C803
R824
IC801
C161
C162
L622
C812
R639
R812
R649
C822
C820
R814
R656R657
R658
R659
R660
R642
Q683
IC703
R641
C808
C814
C654
R784
C824
R783
IC605
C816
IC771
C772
C826
R776
R655
IC802
IC804
R835
C819
R651
C710
R653
R775
R778
C852
R729
C771
R777
R654
C851
R725
R746
R779
R780
R650
R652
R723
R831
IC803
IC806
IC805
R832
R830
R766
D702
C714
BZ791
TH951
IC701
R759
R768
R702
X801
C713
C791
C708
X601
X701
R757
R758
X702
R603R606
R798
R623
R648
R646
R628
R797
R626
D795
Main board
(Forward side)
J1
C117
L1
CN705
C998
C2
C4
Q34
D11
C34
C9
Q91
R83
R93
C81
Q81
C91
IC51
C5
C55
C53
C7
CN703
C32
TU1
R614
PP1
B3
IC608
R773
R781
R765
R782
R774
R772
R763
R764
R762
R770
R736
R761
R709
R722
R721
R724
R720
R719
R718
R717
R715R716
R714
R713
BZ791
IC961
C931
C991 C992 C993
C997
C990
D1
D2
J1
R837
R692
C671
R671
R844
R843
B14
RF
B10
R664
R670
C645
R635
C617
C618
R852
B15
C644
R638
R632
X603
C612
R640
C646
C647
Vref
Q636
C996
CN771
B4
C773
C754
C774
C1
C3
R754
C755
B17
B5
C2
Q13
C11
CN705
D754
C10
C4
C84
R11
R4
C94
R5
Q11
C9
R14
R12
B18
R81
R13
X51
C82
R82
C45
C81
C6
C92
C44
C91
R92
C46
R35
R34
Q52
R56
R91
R55
C42C43
C41
R3
C5
R1
R51
C40
L51
Q1
C7
C53
PP2
Q51
R2
C47
Q32
C8
R33
Q33
B6
C56
C32
R32
R36
Q22
CN703
TU1
R23
PP1
R26
Q23
R726
C48
R727
C22
C21
C23
R24
R739
C719
R734
R735
C712
R745
R753
R728
R731
R732
R733
R707
R708
R710
R711
R701
R751
X702
C707
C702
C701
IC702
C964
C972
C973
R971
R975
C971
C967
Q966
C966
C969
R968
C965
R969
R10
R986
Q965
R15
R970
Q979
R987
Q12
C977
D978
C978
Q977
C51
C52
R53
R913
D980
R52
R54
R219
C54
R218
C25
C57
R118
R119
Q24
R21
R22
R28
R816
R167
C809
C24
R25
R825
R767
C164
R826
C804
C803
R27
R815
C808
C820
B8
C49
C807
C711
C806
C805
C815
C825
C826
D965
B9
L701
D963
R866
C710
R951
R738
R965
R743
R740
R868
R730
R864
C864
R796 R852
R999
R863
R865
R867
C714
R794
R793
Q701
R795
R792
R755
R769
R747 R748
R737
R742
R741
C706
C713
X701
C708
C705
C703 C704
C715
R705
R706
R927
R703
D711
R925
R135
C995
CN301
R136
R338
CN302
R961
R339
C337
R178
Q423
C987
C962
R335
Q323
Q321
C329
R274
C323
R984
C982
R333
Q322
R176
Q986
R334
C994
C325
C336
R275
R435
R985
C174
C175
C910
C452
C918
C911
C915
R175
C203
C212
R352
C450
C451
C103
C916
C352
B7
Q642
C112
R177
R912
C321
C351
R351
C952
C350
Q161
R165
R622
C652
C161
C162
R166
C653
Q641
R634
X602
C816
C853
C680
R678
C660
L606
R677
B606
C678
C677
R870
C866
R869
R871
R872
R874
C841
C876
R876
C878
C614
C615
C616
C860
C863
R859
X801
R861
R862
C862
BZ791
C605
R860
C861
B16
C606
R604
C792
C601
R791
C604
R602
R605
C791
X601
R601
C602
C726
Q791
CN704
R922
Main board
(Reverse side)
D404
C961
CN901
C925
C923
L961
R235
D406
R236
D405
D961
B11
R172
C901
R272
R276
R273
C272
C273
C173
R173
R174
D911
C914
C210
C912
D913
C913
C110
C671
IC607
R670
R853
C617
C618
C609
C603
R926
C942
D407
B12
D415
C409
C408
D403
R242
R241
R245
R402
C410
R404
C172
R401
C943
R403
R145
C242
C407
R141
C941
C401
C405
R146
R142
R405
C241
C403
C406
R246
D409
D411
C305
C402
C306
C310
R305
R301
C309
C141
IC941
C142
C308
D413
R943
C302
C303
C944
Q942
C307
C945
R304
R302
D941
B13
C301
R303
R836
R842
R841
R837
R844
R843
B14
B10
R692
R671
R664
C646
B15
C647
C644
C645
R638
R635
R632
Q636
X603
C612
R640
C619
R607
R608R609
L601
C611
C613
R928
R929
R613
C610
R612
R611
CN602
R610
RF shape of waves
1.0 1.2Vp-p
1-19
KD-SH99
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
0.8
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.
NO
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.
1-20
Play a disc.
Check the eye-pattern at measures
between TP601 and TP602.
Finish.
Description of major ICs
UPD784215AGC145(IC701):MAIN CPU
1.Pin layout
75 51
76
50
KD-SH99
2.Block diagram
INTP2/NMI
INTP0,INTP1
INTP3-INTP6
TI5/TO5
TI6/TO6
TI7/TO7
TI8/TO8
RTP0-RTP7
AV R
ANI0-ANI7
AV R
TI00
TI01
TO0
TI1
TO1
TI2
TO2
ANO0
ANO1
EF1
AV
EF0
AV
AV
PCL
BUZ
100
125
PROGRAMMABEL
INTERRUPT
CONTROLLER
TIMER/COUNTER
TIMER/COUNTER1
TIMER/COUNTER2
TIMER/COUNTER5
TIMER/COUNTER6
TIMER/COUNTER7
TIMER/COUNTER8
WATCH TIMER
OUTPUT PORT
D/A
CONVERTER
SS
A/D
DD
SS
CONVERTER
CLOCK OUTPUT
CONTROL
BUZZER OUTPUT
26
(16 BITS)
(8 BITS)
(8 BITS)
(8 BITS)
(8 BITS)
(8 BITS)
(8 BITS)
WATCHDOG
TIMER
REAL-TIME
78K/IV
CPU CORE
RAM
ROM
UART/IOE1
BAUD-RATE
GENERATOR
UART/IOE2
BAUD-RATE
GENERATOR
CLOCKED
SERIAL
INTERFACE
BUS I/F
PORT 0
PORT 1
PORT 2
PORT 3
PORT 4
PORT 5
PORT 6
PORT 7
PORT 8
PORT 9
PORT 10
PORT 12
PORT 13
SYSTEM
CONTROL
RxD1/SI1
TxD1/SO1
ASCK1/SCK1
RxD2/SI2
TxD2/SO2
ASCK2/SCK2
SI0
SO0
SCK0
AD0-AD7
A0-A7
A8-A15
A16-A19
RD
WR
WAIT
ASTB
P00-P06
P10-P17
P20-P27
P30-P37
P40-P47
P50-P57
P60-P67
P70-P72
P80-P87
P90-P95
P100-P103
P120-P127
P130,P131
RESET
X1
X2
XT1
XT2
V
DD
V
SS
TEST
1-21
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