Jvc KD-G456 Service Manual

MA143200412
SERVICE MANUAL
CD RECEIVER
KD-G456
Area suffix
UH---------------------- Thailand
TABLE OF CONTENTS
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
COPYRIGHT © 2004 Victor Company of Japan, Limited
No.MA143
2004/12
SPECIFICATION
AUDIO AMPLIFIER SECTION
Maximum Power Output Front 50 W per channel
Rear 50 W per channel
Continuous Power Output (RMS) Front 19 W per channel into 4 40 Hz to 20 000 Hz at no more
than 0.8% total harmonic distortion.
Rear 19 W per channel into 4 40 Hz to 20 000 Hz at no more
than 0.8% total harmonic distortion.
Load Impedance 4 (4 to 8 allowance)
Tone Control Range Bass ±10 dB at 100 Hz
Treble ±10 dB at 100 Hz
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 2.0 V/20 k load (full scale) Output Impedance 1 k
Output terminals CD changer
TUNER SECTION
Frequency Range FM 87.5 MHz to 108.0 MHz
AM 531 kHz to 1 602 kHz
FM Tuner Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 35 dB
Capture Ratio 1.5 dB
AM Tuner Sensitivity 20 µV
Selectivity 35 dB
CD PLAYER SECTION
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of channels 2 channels (stereo)
Frequency Response 5 Hz to 20 000 Hz
Dynamic Range 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 decoding format MPEG 1/2 Audio Layer 3
Max. Bit Rate: 320 Kbps
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0°C to +40°C Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 150 mm
Panel Size (approx.) 188 mm × 58 mm × 11 mm
Mass (approx.) 1.4 kg (excluding accessories)
Design and specifications are subject to change without notice.
1-2 (No.MA143)
1.1 Safety Precautions
SECTION 1
PRECAUTIONS
!
!
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.
(No.MA143)1-3
1.2 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.
1.2.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed.
(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) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(caption) Anti-static wrist strap
1M
Conductive material (conductive sheet) or iron plate
(3) Handling the optical pickup
• 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.)
• 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.
1.3 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.
1.4 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
• Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit. (If the flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.
Short-circuit point
(Soldering)
Flexible wire
1-4 (No.MA143)
Pickup
1.5 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 CD,MD and DVD player uses invisible
laser radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open and
the safety interlocks have failed or are defeated. 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 here in may result in
hazardous radiation exposure.
Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CAUTION : Visible and Invisible
CLASS 1 LASER PRODUCT
laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)
ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)
VARNING : Synlig och osynling laserstrålning när den öppnas och spärren är urkopplad. Betrakta ej strålen. (s)
VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)
(No.MA143)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-6 (No.MA143)
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the front panel assembly (See Fig.1)
(1) Push the detach button in the lower right part of the front
panel assembly and remove the front panel assembly.
3.1.2 Removing the bottom cover (See Fig.2)
(1) Turn the main body up side down. (2) Insert a screwdriver under the joints to release the two
joints a on the left side, two joints b on the right side and joint c on the back side of the main body, then remove the bottom cover from the main body.
Note:
When releasing the joints using a screwdriver, do not damage the main board.
Joint a
Front panel assembly
Detach button
Fig.1
Bottom cover
Joint b
3.1.3 Removing the front chassis assembly (See Fig.3)
• Prior to performing the following procedures, remove the front
panel assembly and bottom cover. (1) Remove the two screws A on the both sides of the main
body.
(2) Release the two joints d and two joints e on the both sides
of the main body, then remove the front chassis assembly toward the front.
Joint a
Joint c
Fig.2
Joint d Joint e
A
Joint d
Front chassis assembly
Fig.3
Joint e
Joint b
(No.MA143)1-7
3.1.4 Removing the side panel (See Fig.4)
• Prior to performing the following procedure, remove the front
panel assembly as required. (1) Remove the screw B and two screws C attaching the side
panel on the left side of the main body, and take out the side panel.
3.1.5 Removing the rear bracket (See Fig.5)
• Prior to performing the following procedure, remove the bottom
cover. (1) Remove the three screws D, three screws E and three
screws F attaching the rear bracket on the back side of the main body.
(2) Take out the rear bracket.
F
C
E
C
B
Side panel
Fig.4
EF
Rear bracket
3.1.6 Removing the main board (See Fig.6)
• Prior to performing the following procedures, remove the front
panel assembly, bottom cover, front chassis assembly, side panel and rear bracket. (1) Remove the two screws G attaching the main board. (2) Disconnect the connector CN501
the main body and take out the main board.
on the main board from
G
D
D
Fig.5
Main board
CN501
G
Fig.6
1-8 (No.MA143)
3.1.7 Removing the CD mechanism assembly
(See Fig. 7)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, side panel, rear bracket and main board.
• Remove the front chassis assembly as required.
(1) Remove the three screws H attaching the CD mechanism
assembly on the top chassis.
(2) Take out the CD mechanism assembly.
H
3.1.8 Removing the switch board
(See Figs.8 to 10)
• Prior to performing the following procedures, remove the front
panel assembly. (1) Remove the four screws J on the back side of the front pan-
el assembly. (See Fig.8)
(2) Release the ten joints f and remove the rear cover. (See
Fig.9)
(3) Release the joint g and take out the switch board from the
front panel assembly. (See Fig.10)
CD mechanism assembly
J
Joint f
Top chassis
H
Fig.7
J
J
Fig.8
Joints f
Rear cover
Joints f
Switch board
Joints f
Fig.9
Joint g
Fig.10
Joint f
Front panel assembly
(No.MA143)1-9
3.2 CD Mechanism Assembly
A
3.2.1 Removing the top cover (See Figs.1 and 2)
(1) Remove the two screws A on the both side of the body. (2) Lift the front side of the top cover and move the top cover
backward to release the two joints a.
Top cover
Joints a
A
Joints a
A
Fig.1
Fig.2
Top cover
1-10 (No.MA143)
3.2.2 Removing the connector board
(See Figs.3 to 5)
CAUTION:
Before disconnecting the flexible wire from the pickup, solder the short-circuit point on the pickup. No observance of this in-
struction may cause damage of the pickup. (1) Remove the screw B fixing the connector board. (2) Solder the short-circuit point on the connector board. (3) Disconnect the flexible wire from the pickup. (4) Move the connector board in the direction of the arrow to
release the two joints b.
(5) Unsolder the wire on the connector board if necessary.
CAUTION:
Unsolder the short-circuit point after reassembling.
B
Connector board
Flexible wire
Wires
Joints b
Short-circuit point
Fig.3
Short-circuit point
(Soldering)
Pickup
Flexible wire
Frame
Pickup
Fig.4
B
Connector board
Fig.5
(No.MA143)1-11
3.2.3 Removing the DET switch (See Figs.6 and 7)
(1) Extend the two tabs c of the feed sw. holder and pull out
the switch.
(2) Unsolder the DET switch wire if necessary.
Connector board
DET switch
DET switch
Pickup
Fig.6
Tab c
DET switch wire
Tab c
Feed sw. holder
Fig.7
1-12 (No.MA143)
3.2.4 Removing the chassis unit
r
(See Figs.8 and 9)
• Prior to performing the following procedure, remove the top
cover and connector board. (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.
• When reassembling, make sure that the three shafts on the underside of the chassis unit are inserted to the dampers certainly.
Suspension spring (R)
Chassis unit
Suspension spring (L)
Frame
Suspension spring (R)
Chassis unit
Shafts
Damper
Damper
Suspension spring (L)
Fig.8
Shaft
Dampe
Frame
Fig.9
(No.MA143)1-13
3.2.5 Removing the clamper assembly (See Figs.10 and 11)
• 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.
Clamper arm spring
Joint d
Joint d
Clamper assembly
Fig.10
Clamper arm spring
Chassis rivet assembly
Joint d
Clamper assembly
Chassis rivet assembly
Fig.11
Joint d
1-14 (No.MA143)
3.2.6 Removing the loading / feed motor assembly
(See Figs.12 and 13)
• Prior to performing the following procedure, remove the top
cover, connector board and 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.
(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.12.
Loading / feed motor assembly
Fig.12
Loading / feed motor assembly
C
Fig.13
(No.MA143)1-15
3.2.7 Removing the pickup unit (See Figs.14 to 18)
• Prior to performing the following procedure, remove the top
cover, connector board and chassis unit. (1) Remove the screw D and pull out the pu. shaft holder from
the pu. shaft. (2) Remove the screw E attaching the feed sw. holder. (3) Move the part e of the pickup unit upward with the pu. 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 pu. shaft from the pickup unit. (5) Remove the screw F attaching the feed rack to the pickup
unit.
3.2.8 Reattaching the pickup unit (See Figs.14 to 17)
(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 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:
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. (4) Reattach the feed sw. holder using the screw E. (5) Reattach the pu. shaft to the pickup unit. Reattach the pu.
shaft holder to the pu. shaft using the screw D.
Feed sw. holder
Joint f
Joint g
Feed sw. holder
Part e
Feed rack
Part i
E
Pickup unit
Slot j
F
Fig.15
Pu. shaft
Pickup unit
Joint f
Joint h
Fig.16
Feed rack
Pickup unit
Feed sw. holder
D
Pu. shaft holder
Pu. shaft
D
Pu. shaft holder
1-16 (No.MA143)
Pickup unit
Fig.14
Part e
E
Joint g
Feed rack
Fig.17
Pickup unit
Joint g
Joint f
Feed sw. holder
Fig.18
3.2.9 Removing the trigger arm
r
(See Figs.19 and 20)
• Prior to performing the following procedure, remove the top cover, connector board and clamper unit. (1) Turn the trigger arm in the direction of the arrow to release
the joint k and pull out upward.
CAUTION:
When reassembling, insert the part m and n of the trigger arm into the part p and q at the slot of the chassis rivet assembly respectively and join the joint k at a time.
Chassis rivet assembly
Trigger arm
Chassis rivet assembly
Joint k
Trigger arm
Fig.19
Part p
Part q
Part m
Part n
3.2.10 Removing the top plate assembly
(See Fig.21)
• Prior to performing the following procedure, remove the top cover, connector board, chassis unit, and clamper assembly. (1) Remove the screw H. (2) Move the top plate assembly in the direction of the arrow to
release the two joints r.
(3) Unsolder the wire marked s if necessary.
H
Fig.20
Top plate assembly
Joints
s
Fig.21
(No.MA143)1-17
3.2.11 Removing the mode sw. / select lock arm (See Figs.22 and 23)
• Prior to performing the following procedure, remove the top
plate assembly. (1) Bring up the mode sw. to release from the link plate (joint t)
and turn in the direction of the arrow to release the joint u. (2) Unsolder the wire of the mode sw. marked s if necessary. (3) Turn the select lock arm in the direction of the arrow to re-
lease the two joints v. (4) The select lock arm spring comes off the select lock arm at
the same time.
Top plate
Link plate
Joint u
Joint t
s
Fig.22
Select lock arm
Select lock arm
Mode sw.
Select lock arm
Top plate
Hook w
Select lock arm spring
Link plate
Joints v
Fig.23
1-18 (No.MA143)
3.2.12 Reassembling the mode sw. / select lock arm (See Figs.24 to 26)
REFERENCE:
Reverse the above removing procedure.
(1) Reattach the select lock arm spring to the top plate and set
the shorter end of the select lock arm spring to the hook w on the top plate.
(2) Set the other longer end of the select lock arm spring to the
boss x on the underside of the select lock arm, and join the select lock arm to the slots (joint v). Turn the select lock arm as shown in the figure.
(3) Reattach the mode sw. while setting the part t to the first
peak of the link plate gear, and join the joint u.
CAUTION:
When reattaching the mode sw., check if the points y and z are correctly fitted and if each part operates properly.
Select lock arm spring
Hook w
Joint v
Joint v
Select lock arm
Boss x
Fig.24
Joint t
Point y
Link plate
Point z
Link plate
Fig.25
Mode sw.
Select lock arm
Joint t
Joint u
Fig.26
(No.MA143)1-19
3.2.13 Removing the select arm R / link plate (See Figs.27 and 28)
• 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 a') and turn as shown in the figure to release the two joints b' and joint c'.
(2) Move the link plate in the direction of the arrow to release
the joint d'. Remove the link plate spring at the same time.
REFERENCE:
Before removing the link plate, remove the mode sw..
Select arm R
Joint b'
Link plate spring
Joint c'
Joint a'
Link plate
Joint b'
Fig.27
Joint r
3.2.14 Reattaching the Select arm R / link plate (See Figs.29 and 30)
REFERENCE:
Reverse the above removing procedure. (1) Reattach the link plate spring. (2) Reattach the link plate to the link plate spring while joining
them at joint d'.
(3) Reattach the joint a' of the select arm R to the first peak of
the link plate while joining the two joints b' with the slots. Then turn the select arm R as shown in the figure. The top plate is joined to the joint c'.
CAUTION:
When reattaching the select arm R, check if the points e' and f' are correctly fitted and if each part operates prop­erly.
Top plate
Select arm R
Joint b'
Joint d'
Link plate
Fig.28
Link plate spring
Joint c'
Joint d'
Joint b'
Joint a'
Fig.29
1-20 (No.MA143)
Joint a'
Point e'
Link plate
Point f'
Fig.30
3.2.15 Removing the loading roller assembly
(See Figs.31 to 33)
• Prior to performing the following procedure, remove the
clamper assembly and top plate assembly. (1) Push inward the loading roller assembly on the gear side
and detach it upward from the slot of the joint g' of the lock arm rivet assembly.
(2) Detach the loading roller assembly from the slot of the joint
h' of the lock arm rivet assembly.
Roller guide spring
Part k'
Loading roller assembly
Loading roller assembly
The roller guide comes off the gear section of the loading roller assembly.
Remove the roller guide and the HL washer from the shaft
of the loading roller assembly. (3) Remove the screw J attaching the lock arm rivet assembly. (4) Push the shaft at the joint i' of the lock arm rivet assembly
inward to release the lock arm rivet assembly from the slot
of the L side plate. (5) Extend the lock arm rivet assembly outward and release
the joint j' from the boss of the chassis rivet assembly. The
roller guide springs on both sides come off at the same
time.
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 k' of the roller guide spring inside of the roller guide. (Refer to Fig.34.)
Roller guide
HL washer
Loading roller assembly
Roller guide
Chassis rivet assembly
J
Roller guide spring
Fig.32
Boss
L side plate
Roller guide spring
Joint h'
Roller guide spring
Loading roller assembly
Joint g'
Lock arm rivet assembly
Fig.31
Roller guide spring
Roller guide spring
Lock arm rivet assembly
Lock arm rivet assembly
Joint i'
Part j'
Fig.33
Roller guide
HL washer
Roller shaft assembly
Loading roller
Roller guide spring
Fig.34
(No.MA143)1-21
3.2.16 Removing the loading gear 5, 6 and 7 (See Figs.35 and 36)
• Prior to performing the following procedure, remove the top
cover, chassis unit, pickup unit and top plate assembly. (1) Remove the screw K attaching the loading gear bracket.
The loading gear 6 and 7 come off the loading gear brack­et.
(2) Pull out the loading gear 5.
K
Loading gear bracket
K
Loading gear 6
Loading gear 5
Loading gear 3
Fig.35
Loading gear bracket
Loading gear 5
Loading gear 6
Loading gear 7
Fig.36
1-22 (No.MA143)
3.2.17 Removing the gears
(See Figs.37 to 40)
• Prior to performing the following procedure, remove the top
cover, chassis unit, top plate assembly and pickup unit.
• Pull out the loading gear 3. (See Fig.35.)
(1) Pull out the feed gear. (2) Move the loading plate assembly in the direction of the ar-
row to release the L side plate from the two slots m' of the chassis rivet assembly. (See Fig.37.)
(3) Detach the loading plate assembly upward from the chas-
sis rivet assembly while releasing the joint n'. Remove the slide hook and loading plate spring from the loading plate assembly.
(4) Pull out the loading gear 2 and remove the change lock le-
ver.
(5) Remove the E ring and washer attaching the changer gear
2.
(6) The changer gear 2, change gear spring and adjusting
washer come off. (7) Remove the loading gear 1. (8) Move the change plate rivet assembly in the direction of the
arrow to release from the three shafts of the chassis rivet
assembly upward. (See Fig.38.) (9) Detach the loading gear plate rivet assembly from the shaft
of the chassis rivet assembly upward while releasing the
joint p'. (See Figs.38 and 40.)
(10) Pull out the loading gear 4.
Change plate rivet assembly
Shafts
E ring
Loading plate assembly
Loading plate spring
Joint p'
Loading gear 4
Loading gear plate rivet assembly
Shaft
Loading gear 2
Loading gear 1
Chassis rivet assembly
Change gear 2
Fig.38
Joint n'
Slide hook
Feed gear
Fig.37
Slot m'
L side plate
Loading plate assembly
Joint n'
Slot m'
Chassis rivet assembly
Chassis rivet assembly
E ring
Washer
Change gear 2
Change gear spring
Adjusting washer
Change plate
rivet assembly
Chassis rivet assembly
L side plate
Slot m'
Slot m'
Fig.39
Loading gear 1
Loading gear 2
Change lock lever
Loading gear 4
Loading gear plate rivet assembly
Fig.40
(No.MA143)1-23
3.2.18 Removing the turn table / spindle motor (See Figs.41 and 42)
• Prior to performing the following procedure, remove the top
cover, connector board, chassis unit and clamper assembly. (1) Remove the two screws L attaching the spindle motor as-
sembly through the slot of the turn table on top of the body.
(2) Unsolder the wire on the connector board if necessary.
Turn table
L
Fig.41
L
Turn table
1-24 (No.MA143)
Spindle motor
Fig.42
SECTION 4
ADJUSTMENT
4.1 Adjustment method
Test instruments required for adjustment
(1) Digital oscilloscope (100MHz) (2) Electric voltmeter (3) Digital tester (4) Tracking offset meter (5) Test Disc JVC :CTS-1000 (6) Extension cable for check
EXTSH002-22P × 1
Standard volume position
Balance and Bass &Treble volume : lndication"0" Loudness : OFF
How to connect the extension cable for adjusting
Caution:
Be sure to attach the heat sink and rear bracket onto the power amplifier IC and regulator IC respectively, before supply the power. If voltage is applied without attaching these parts, the power amplifier IC and regulator IC will be destroyed by heat.
Standard measuring conditions
Power supply voltage DC14.4V(11 to 16V)
Load impedance 20K(2 Speakers connection)
Output Level Line out 2.0V (Vol. MAX)
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.
Heat sink
Extension cable
EXTSH002-22P
Rear bracket
(No.MA143)1-25
5.1 Feed section
SECTION 5
TROUBLESHOOTING
Is 5v or 0V at IC541 pin 40?
YES
Is 4V present at both sides of the feed motor?
YES
Check the feed motor.
5.2 Focus section
5.3 Spindle section
NO
Is the wiring for IC541 pin 40 correct?
NO
Is 6V or 2V present at IC501 pins 4 and 5?
Check IC501.
When the lens is moving:
Does the S-search waveform appear at IC501 pins 8 and 9?
NO
NO
YES
4V
YES
YES
Is 5V present at IC501 pin 20?
Check the vicinity of IC541.
Check the feed motor connection wiring.
NO
Check the circuits in the vicinity of IC501 pins 15 and 16.
Check the pickup and its connections.
NO
Check CD8V.
YES
YES
Is the disk rotated?
YES
Does the RF signal appear at RF test point?
YES
Is the RF waveform at RF test point distorted?
YES
Proceed to the Tracking section
5.4 Tracking section
When the disc is rotated at first:
Is the tracking error signal output at IC521 pin 11?
NO
Is 4V present between IC501 pins 6 and 7?
Check the spindle motor and its wiring.
NO
Check the circuits in the vicinity of IC521 pins 2 to 12 or the pickup.
NO
NO
Approx. 1.2V
YES
NO
YES
Check the circuits in the vicinity of IC521 pins 2 to 12.
Is 4V present at IC541 pin 41?
YES
Check the vicinity of IC501.
NO
Check the pickup and its connections.
NO
Check IC541.
1-26 (No.MA143)
Check IC541.
5.5 Signal processing section
Is the sound output from both channels (L, R)?
YES
Normal
NO
No sound from either channel.
Is 9V present at IC161 pin 31?
Is the audio signal (including sampling output components) output to IC581 pins 1 and 7 during playback?
Is the audio signal output at IC161 pins 3 and 30 during playback?
YES
YES
YES
Compare the L-ch and
NO
R-ch to locate the defective point.
NO
Is 9V present at IC901 pin 13?
Check the connection between IC901 pin13 and IC161 pin31.
NO
Check IC581 and its peripheral circuits.
NO
Check IC161 and its peripheral circuits.
YES
NO
Check IC901 and its peripheral circuits.
YES
Check the power amp. IC301.
(No.MA143)1-27
5.6 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.
• The level of RF output (EFM output: amplitude of eye pattern) will be low.
5.7 Replacement of laser pickup
Turn of the power switch and, disconnect the power cord.
Replace the pickup with a normal one. (Refer to "Removing the pickup unit" on the previous page.)
Is RF output
1.3 0.4Vp-p?
NO
Replace it.
YES
OK
(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.
Plug the power cord in, and turn the power on. At this time, check that the laser emits for about seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at
RF test point.
Finish.
1-28 (No.MA143)
5.8 16 PIN CORD DIAGRAM
8
7
6
BL/WH
5
4
3
2
1
BK RD
NC
WH
GN
VI
GY
WH/BK
GN/BK
VI/BK
GY/BK
16 YL
8 BK
7 RD
5 BL/WH REMOTE
4 WH
12 WH/BK
3 GN
11 GN/BK RL-
2 VI RR+
10 VI/BK
1 GY FR+
YL
NC
NC
NC
16
15
14
13
12
11
10
9
MEMORY
GND
ACC
FL+
FL-
RL+
RR-
BK
RD
BL
WH
Black
Red
Blue
White
GN
VI
GY
YL
Green
Violet
Gray
Yellow
9 GY/BK
RR
FR
FL
RL
Rear Right
Front Right
Front Left
Rear Left
FR-
REMOTE
ACC
MEMORY
GND
Remote out
ACC Line
Memory Backup Battery +
Ground
(No.MA143)1-29
Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY CAR ELECTRONICS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.MA143)
Printed in Japan
VPT
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