JVC KD-LH2000R Service Manual

SERVICE MANUAL
CD RECEIVER
KD-LH2000R
KD-LH2000R
Contents
1-2 1-3 1-4 1-5 1-20
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
Flow of functional operation unit TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs
E EX
Area Suffix
Continental Europe
Central Europe
1-21 1-23 1-23 1-24~51
No.49753
Jun. 2002
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-LH2000R
Front panel unit
Removing the bottom cover
(See Fig.2,3)
1.
Turn the body upside down.
2.
Insert a screwdriver to the two joints a and two joints b on both sides of the body and the joint c on the back of the body, then detach the bottom cover from the body.
CAUTION:
When disengaging the joint c using a screwdriver, do not damage or break the board.
Removing the front chassis (See Fig.4,5)
Prior to performing the following procedure, remove the bottom cover.
1.
Remove the two screws A attaching the front chassis.
Joint a
Joint c
Bottom cover
Fig.1
Bottom cover
Joint b
Fig. 2
Joint b
2.
Remove the two screws B on each side of the body.
3.
Release the two joints d and the two joints e on the sides. remove the front chassis toward the front.
Joint d
Joint e
B
Joint d
Front chassis
Fig. 5
Joint e
Joint a
A
Joint c
Fig. 3
Front chassis
Fig.4
1-5
KD-LH2000R
Removing the heat sink (See Fig.6)
1.
Remove the four screws C attaching the heat sink on the left side of the body, and remove the heat sink.
Removing the rear panel (See Fig.7 )
C
C
Heat sink
Fig. 6
C
Prior to performing the following procedure, remove the front chassis, the heat sink and bottom cover.
1.
Remove the six screws D attaching the rear panel and one screw E attaching the pine jack on the back of the body.
D
Rear panel
Removing the main amplifier board assembly
(See Fig.8)
Prior to performing the following procedure, remove the front chassis, the heat sink, bottom cover and the rear panel.
D
Fig. 7
E
D
D
1.
Remove the two screws F attaching the main amplifier board assembly on the top cover.
2.
Disconnect connector CN601 on the main amplifier board assembly from the cassette mechanism assembly.
1-6
F
Main board assembly
F
CN601
Fig. 8
KD-LH2000R
Removing the MP3 board
(See Fig.9)
Prior to performing the following procedure, remove the top cover.
1.
Disconnect the wire from connector CN601on the MP3 board.
2.
Remove the five screws G and the MP3 board, releasing the joint f and g.
G
f
MP3 board
g
CN601
G
Fig.9
Removing the CD mechanism assembly
(See Fig.10)
Prior to performing the following procedure, remove the front chassis, the heat sink, bottom cover and the main amplifier board assembly.
1.
Remove the three screws H attaching the cassette mechanism assembly from the top cover.
Top cover
H
H
H
CD mechanism assembly
Fig. 10
1-7
KD-LH2000R
Removing the (LCD & key) control switch
board (See Fig.11
Prior to performing the following procedure, remove the front panel assembly.
1.
Remove the four screws I attaching the rear cover on the back of the front panel assembly.
2.
Unjoint the nine joints h with the front panel and the rear cover.
3.
Remove the control switch board on the back of the front panel.
~ 13)
I
I
Fig. 11
I
I
Front panel
Joint h
LCD & Key control board
Joint h
Rear cover
Joint h
Joint h
Fig. 12
1-8
Fig. 13
< CD mechanism section >
Removing the top cover
(See Fig.1 and 2)
1.
Remove the two screws A on each side of the body.
2.
Lift the front side of the top cover and move the cover backward to release the two joints a.
Removing the connector board
(See Fig.3 to 5)
Top cover
A
KD-LH2000R
A
Joints a
CAUTION:
1.
Remove the screw B fixing the connector board.
2.
Solder the short-circuit point on the connector board. Disconnect the flexible wire from the pickup.
3.
Move the connector board in the direction of the arrow to release the two joints b.
4.
Unsolder the wire on the connector board if necessary.
CAUTION:
Before disconnecting the flexible wire from the pickup, solder the short-circuit point on the pickup. No observance of this instruction may cause damage of the pickup.
Unsolder the short-circuit point after reassembling.
A
Fig.1
Joints a
Top cover
Fig.2
DET switch
B
Flexible wire
Frame
Connector board
B
Connector board
Joints b
Flexible wire
Short-circuit
Fig.3
Fig.4Fig.5
Pickup
Short-circuit point
(Soldering)
Pickup
1-9
KD-LH2000R
Removing the DET switch
(See Fig.3 and 6)
1.
Extend the two tabs c of the feed sw. holder and pull out the switch.
2.
Unsolder the DET switch wire if necessary.
Removing the chassis unit
(See Fig.7 and 8)
Prior to performing the following procedure, remove the top cover and the connector board.
B
Connector board
Joints b
Short-circuit
Fig.3
DET switch
Pickup
1.
Remove the two suspension springs (L) and (R) attaching the chassis unit to the frame.
CAUTION:
The shape of the suspension spring (L) and (R) are different. Handle them with care.
CAUTION:
When reassembling, make sure that the three shafts on the underside of the chassis unit are inserted to the dampers certainly.
Chassis unit
Suspension spring (R)
Suspension spring (L)
Frame
DET switch
Chassis unit
Tab c
Feed sw. holder
Tab c
Fig.6
Shaft
1-10
Suspension spring (R)
Suspension spring (L)
Shafts
Damper
Damper
Damper
Frame
Fig.8Fig.7
Removing the clamper assembly
(See Fig.9 and 10)
KD-LH2000R
Prior to performing the following procedure, remove the top cover.
1.
Remove the clamper arm spring.
2.
Move the clamper assembly in the direction of the arrow to release the two joints d.
Removing the loading / feed motor assembly (See Fig.11 and 12)
Prior to performing the following procedure, remove the top cover, the connector board and the chassis unit.
1.
Remove the screw C and move the loading / feed motor assembly in the direction of the arrow to remove it from the chassis rivet assembly.
Clamper arm spring
Joint d
Joint d
Clamper assembly
Fig.9
Clamper arm spring
Chassis rivet assembly
Joint d
Clamper assembly
Joint d
2.
Disconnect the wire from the loading / feed motor assembly if necessary.
CAUTION:
When reassembling, connect the wire from the loading / feed motor assembly to the flame as shown in Fig.11.
Chassis rivet assembly
Fig.10
Loading / feed motor assembly
C
Loading / feed motor assembly
Fig.12Fig.11
1-11
KD-LH2000R
Removing the pickup unit
(See Fig.13 to 17)
Prior to performing the following procedure, remove the top cover, the connector board and the chassis unit.
1.
Remove the screw D and pull out the pu. shaft holder from the shaft.
2.
Remove the screw E attaching the feed sw. holder.
3.
Move the part e of the pickup unit upward with the shaft and the feed sw. holder, then release the joint f of the feed sw. holder in the direction of the arrow. The joint g of the pickup unit and the feed rack is released, and the feed sw. holder comes off.
4.
Remove the shaft from the pickup unit.
5.
Remove the screw F attaching the feed rack to the pickup unit.
Reattaching the pickup unit
(See Fig.13 to 16)
Joint f
Shaft
D
Joint e
Pu. shaft holder
Feed sw. holder
Pickup unit
Fig.13
Pickup unit
E
Joint f
Joint e
1.
Reattach the feed rack to the pickup unit using the screw F.
2.
Reattach the feed sw. holder to the feed rack while setting the joint tab g to the slot of the feed rack and setting the part f of the feed rack to the switch of the feed sw. holder correctly.
3.
As the feed sw. holder is temporarily attached to the pickup unit, set to the gear of the joint g and to the bending part of the chassis (joint h) at a time.
CAUTION:
4.
Reattach the feed sw. holder using the screw E.
5.
Reattach the shaft to the pickup unit. Reattach the pu. shaft holder to the shaft using the screw D.
Make sure that the part i on the underside of the feed rack is certainly inserted to the slot j of the change lock lever.
F
Feed rack
Feed rack
E
Joint g
Feed sw. holder
Part i
Pickup unit
Slot j
Joint g
Feed sw. holder
Fig.14
Shaft
Joint f
Joint h
Fig.15
D
Pu. shaft holder
Pickup unit
1-12
Pickup unit
Feed rack
Joint f
Feed sw. holder
Fig.17Fig.16
Removing the trigger arm
(See Fig.18 and 19)
Prior to performing the following procedure, remove the top cover, the connector board and the clamper unit.
1.
Turn the trigger arm in the direction of the arrow to release the joint k and pull out upward.
KD-LH2000R
Joint k
Trigger arm
CAUTION:
When reassembling, insert the part l and
m of the trigger arm into the part n and o at the slot of the chassis rivet
assembly respectively and join the joint k at a time.
Chassis rivet assembly
Chassis rivet assembly
Trigger arm
Fig.18
Part n
Part o
Part l
Part m
Fig.19
Removing the top plate assembly
(See Fig.20)
Prior to performing the following procedure, remove the top cover, the connector board, the chassis unit, and the clamper assembly.
1.
Remove the screw H.
2.
Move the top plate assembly in the direction of the arrow to release the two joints p.
3.
Unsolder the wire marked q if necessary.
H
Top plate assembly
Joints p
q
Fig.20
1-13
KD-LH2000R
Removing the select arm (L) / select lock arm (See Fig.21 and 22)
Prior to performing the following procedure, remove the top plate assembly.
1.
Bring up the select arm (L) to release from the link plate (joint r) and turn in the direction of the arrow to release the joint s.
2.
Unsolder the wire of the select arm (L) marked q if necessary.
3.
Turn the select lock arm in the direction of the arrow to release the two joints t.
The select lock arm spring comes off the select lock arm at the same time.
Reassembling the select arm (L) / select lock arm (See Fig.23 to 25)
Select arm (R)
Joint z
Link plate spring
Top plate
Joint a'
Joint y
Link plate
Joint z
Joint s
Fig.21
Select lock arm
Select lock arm
Joint b'
Joint r
Select arm (L)
Select lock arm
q
Top plate
Hook u
Select lock arm spring
Joints t
REFERENCE:
1.
Reattach the select lock arm spring to the top plate
Reverse the above removing procedure.
and set the shorter end of the select lock arm spring to the hook u on the top plate.
2.
Set the other longer end of the select lock arm spring to the boss v on the underside of the select lock arm, and join the select lock arm to the slots (joint t). Turn the select lock arm as shown in the figure.
3.
Reattach the select arm (L) while setting the part r to the first peak of the link plate gear, and join the joint s.
CAUTION:
When reattaching the select arm (L), check if the points w and x are correctly fitted and if each part operates properly.
Joint r
Link plate
Link plate
Select lock arm spring
Boss v
Select arm (R)
Joint a'
Fig.22
Hook u
Joint t
Joint t
Select lock arm
Fig.23
Link plate spring
Select arm (L)
Joint b'
1-14
Joint r
Fig.25Fig.24
Joint s
Select lock arm
Point x
KD-LH2000R
Removing the select arm (R) / link plate
(See Fig.21 and 22)
Prior to performing the following procedure, remove the top plate assembly.
1.
Bring up the select arm (R) to release from the link plate (joint y) and turn as shown in the figure to release the two joints z and joint a’.
2.
Move the link plate in the direction of the arrow to release the joint b’. Remove the link plate spring at the same time.
REFERENCE:
Before removing the link plate, remove the select arm (L).
Reattaching the Select arm (R) / link plate (See Fig.25 and 26)
REFERENCE:
Reverse the above removing procedure.
Select arm (R)
Joint z
Link plate spring
Top plate
Joint a'
Part y
Link plate
Joint z
Joint s
Fig.21
Select lock arm
Select lock arm
Joint b'
Joint r
Select arm (L)
Select lock arm
q
Top plate
Hook u
Select lock arm spring
1.
Reattach the link plate spring.
2.
Reattach the link plate to the link plate spring while joining them at joint b’.
3.
Reattach the part y of the select arm (R) to the first peak of the link plate while joining the two joints z with the slots. Then turn the select arm (R) as shown in the figure. The top plate is joined to the joint a’.
CAUTION:
When reattaching the select arm (R), check if the part c’ is correctly fitted and if each part operates properly.
Select arm (R)
Joint z
Link plate
Link plate spring
Joint a'
Part y
Part y
Fig.22
Joint b'
Joint z
Fig.25
Joints t
Select arm (L)
Select lock arm
Point x
Fig.26
Link plate
1-15
KD-LH2000R
Removing the loading roller assembly
(See Fig.27 to 29)
Prior to performing the following procedure, remove the clamper assembly and the top plate assembly.
1.
Push inward the loading roller assembly on the gear side and detach it upward from the slot of the joint d of the lock arm rivet assembly.
Detach the loading roller assembly from the slot of the joint e of the lock arm rivet assembly.
The roller guide comes off the gear section of the loading roller assembly.
Remove the roller guide and the washer from the shaft of the loading roller assembly.
2.
Remove the screw I attaching the lock arm rivet assembly.
3.
Push the shaft at the joint f of the lock arm rivet assembly inward to release the lock arm rivet assembly from the slot of the slide plate. Extend the lock arm rivet assembly outward and release the joint g from the boss of the chassis rivet assembly. The roller guide springs on both sides come off.
Roller guide
Washer
Loading roller assembly
Roller guide
Joint e'
Roller guide spring
Roller guide spring
Joint d'
Loading roller assembly
Roller guide spring
Lock arm rivet assembly
Fig.27
Loading roller assembly
Roller guide spring
CAUTION:
When reassembling, reattach the left and right roller guide springs to the lock arm rivet assembly before reattaching the lock arm rivet assembly to the chassis rivet assembly. Make sure to fit the part h of the roller guide spring (L) inside of the roller guide (Refer to Fig.30).
Roller guide
Washer
Roller shaft assembly
Joint h'
Loading roller assembly
Roller guide spring
Fig.28-1
Fig.28-2
Chassis rivet assembly
Boss
Slide plate
Roller guide spring
I
1-16
Frame
Loading roller
Roller guide spring
Lock arm rivet assembly
Joint f'
Part g'
Fig.29Fig.30
KD-LH2000R
Removing the loading gear (5), (6) and (7) (See Fig.31 and 32)
Prior to performing the following procedure, remove the top cover, the chassis unit and the top plate assembly.
1.
Remove the screw J attaching the loading gear bracket. The loading gear (6) and (7) come off the loading gear bracket.
2.
Pull out the loading gear (5).
Loading gear bracket
J
Loading gear (6)
Loading gear (5)
Loading gear (3)
Fig.31
J
Loading gear bracket
Loading gear (5)
Loading gear (6)
Loading gear (7)
Fig.32
1-17
KD-LH2000R
Removing the gears (See Fig.33 to 36)
Prior to performing the following procedure, remove the top cover, the chassis unit, the top plate assembly and the pickup unit.
1.
Pull out the feed gear.
Slot j'
Slide plate
2.
Move the loading plate assembly in the direction of the arrow to release the slide plate from the two slots j’ of the chassis rivet assembly.
3.
Detach the loading plate assembly upward from the chassis rivet assembly while releasing the joint k’. Remove the slide hook and the loading plate spring from the loading plate assembly.
4.
Pull out the loading gear (2) and remove the change lock lever.
5.
Remove the E-washer and the washer attaching the changer gear (2).
6.
The changer gear (2), the changer gear spring and the adjusting washer come off.
7.
Remove the loading gear (1).
8.
Move the hang plate rivet assembly in the direction of the arrow to release from the three shafts of the chassis rivet assembly upward.
9.
Detach the loading gear plate rivet assembly from the shaft of the chassis rivet assembly upward while releasing the joint l.
Feed gear
Change plate rivet assembly
Shafts
E-washer
Loading plate assembly
Joint k' Slot j'
Fig.33
Joint l'
Loading gear (4)
Loading gear plate rivet assembly
Loading gear (2)
Loading gear (1)
Change gear (2)
10.
Pull out the loading gear (4).
Loading plate assembly
Loading plate spring
Slot j'
Chassis rivet assembly
Joint k'
Slide hook
Slide plate
Slot j'
E-washer
Washer
Loading gear (2)
Loading plate spring
Adjusting washer
Change plate rivet assembly
Chassis rivet assembly
Fig.34
Loading gear (1)
Loading gear (2)
Change lock lever
Loading gear (4)
Loading gear plate rivet assembly
Fig.36Fig.35
1-18
KD-LH2000R
Removing the turn table / spindle motor
(See Fig.37 and 38)
Prior to performing the following procedure, remove the top cover, the connector assembly and the chassis / clamper assembly.
1.
Remove the two screws K attaching the spindle motor assembly through the slot of the turn table on top of the body.
2.
Unsolder the wire on the connector board if necessary.
K
Turn table
Fig.37
K
Turn table
Spindle motor
Fig.38
1-19
KD-LH2000R
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 EXTSH002-22P 1
Standard measuring conditions Power supply voltage : DC14.4V(11V~16V allwance) Load impedance : 4 (4 to 8 allowance) Line-out Level / Impedance:
2.0V / 20 k load
How to connect the extension cable for adjusting
Standard volume position Balance and Bass &Treble volume : lndication"0" S.BASS : O EQ : FLAT Frequency Band FM 87.5MHz ~ 108.0MHz AM (MW) 522kHz ~ 1620 kHz (LW) 144kHz ~ 279 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.
Extension cables EXTSH002-22P
CN601
Doing such as cardboard puts finishing between the main body and mechanism.
fixes with rubber band.
1-20
Flow of functional operation unit TOC read
Power ON
When the pickup correctly moves
v
to the inner area of the disc
Set Function CD
KD-LH2000R
When the laser diode correctly
emits
Microprocessor commands
FMO TC94A14FA" 40"
FEED MOTOR +TERMINAL IC681
REST SW
When correctly focused
FEO TA2157" 15"
Focus Servo Loop ONo
$83
$82
$81
3.3V Hi-Z 0V
6V 4V 2V
OFF ON
Pickup feed to the inner area
2.2V
RF signal eye-patternn remains closed
RF signal eye-pattern opens
Disc inserted
YES
Laser emitted
Focus search
Disc rotates
Tracking loop closed
TOC read out
YES
Microprocessor commands
SEL TC94A14FA"38"
LD CN601"8"
"No disc" display
When the disc correctly rotates
Microprocessor commands
DMO TC94A14FA"41"
Spindle motor(-) IC681"7"
$84 $86 $ A200
Acceleration Servo CLV
Rough Servo
0.5 Sec 0.5 Sec
$84
3.3V 0V
2V 0V
3.3V
2.2V 0V
6V
3.2 2V
Jump to the first track
Play
Tracking Servo Loop ON
RF signal
Rough Servo Modev
CLV Servo Mode (Program Area)
CLV Servo Mode (Lead-In Area; Digital :0)
1-21
KD-LH2000R
Feed section
Is the voltage output at IC621 pin "40" 3.3V or 0V?
YES
Is 4V present at both sides of the feed motor?
YES
NO YES NO
NO
Is the wiring for IC621
(56)~(64) correct?
NO
Is 6V or 2V present at
IC681 "4" and "5"?
NO
Is 3.3V present at IC681
pin "20"?
Check the vicinity of
IC621.
YES
Check the feed motor
connection wiring.
YES
Check CD 8V
and 5V.
Check the feed motor.
Focus section
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC681 pins "10" and "11"?
Spindle section
Is the disk rotated?
YES
Does the RF signal
appear at TP1?
YES
Is the RF waveform at TP1
distorted?
YES
Proceed to the Tracking
section
Check IC681.
NO
YES
NO
NO
NO
Check the circuits in the vicinity of IC681 pins "10","11"and"14".
Check the pickup and
its connections
Is 4V present at IC681
pins "6" and "7"?
Check the spindle motor
and its wiring
Check the circuits in the
vicinity of IC601 "19"~
"24" or the pickup
YES
YES
NO
Is 3.3V present at IC621
pins "41" ?
Check the vicinity of
IC681.
NO
YES
Check IC621 and
IC601.
Tracking section
1-22
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error signal
output at IC601 "11"?
YES
Check IC621.
YES YES
Check the circuit in the
vicinity of IC601 pins
"2"~"12".
Check the pickup and
its connections
Maintenance of laser pickup
(1) Cleaning the pickup lens Before you replace the pickup,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:amplitude of eye patterrn) will be low.
KD-LH2000R
Is RF output
1.3 0.4Vp-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.
NO
Replace it.
Replacement of laser pickup
Turn of 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.
1-23
KD-LH2000R
Description of major ICs
UPD784215AGC179 (IC701) : CPU
1.
Pin
layout
75 ~ 51
76
~
100
1 ~ 25
50
~
26
2. Pin function
Pin NO. Symbol Function
1~7
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
41~43
44 45 46 47 48
49~52
53
NC
ANT CONT
VDD
X2 X1
VSS
XT2 XT1
RESET
NC
BUS-INT
PS2
CD-REQ
RDS-SCK
RDS DA
KEY DATA
AVDD
AVREF0
VOL1 VOL2 KEY1 KEY2
NC
MRC
SQ SM
AVSS
NC
STAGE3
AVREF BUS-SI
BUS-SO
BUS-SCK
BUS-I/O
NC
BUZZER
E2PROM-DI
E2PROM-DO
E2PROM-CLK
OPEN
NC
SD/ST
I/O
-
­Antenna remote control
O
Maicon power supply
I I
O
GND
I I
O
SYSTEM RESET
I
-
­J-BUS INT
I
Power save2, H means STOP mode
I
CD REQ INPUT
I
RDS clock input
I
RDS data input
I
KEY DATA
I
A/D converter power supply
I
A/D reference voltage
O
Volume encoder pulse input 1
I
Volume encoder pulse input 2
I
Handle remocon input 1
I
Handle remocon input 2
I
-
­MRC input
I
S.Quality level input
I
S.METER input
I
GND
I
-
­Feature selection H:2000 L:1000
I I
J-BUS data input
I
J-BUS data output
O
J-BUS clock input / output
I/O
J-BUS I/O selection output:H, input:L
O
-
­Buzzer output
O
I2C data input
I
I2C data output
O
I2C clock output
O
DOOR OPEN SW
I
-
­Station detector or streo indica tor i nput ;
I
H means a station is there. L means the program is stereo.
1-24
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