JVC KDG-401 Service manual
SERVICE MANUAL
CD RECEIVER
MA05120041
KD-G401
Area suffix
E ----------- Continental Europe
EX --------------- Central Europe
KD-G401
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.MA051
2004/1
SPECIFICATION
AUDIO AMPLIFIER SECTION
Maximum Power Output Front 50 W per channel
Rear 50 W per channel
Continuous Power Output
(RMS)
Load Impedance 4 Ω (4 Ω to 8 Ω allowance)
Tone Control Range Bass ±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 kΩ load (full scale)
Output Impedance 1 kΩ
Frequency Range FM 87.5 MHz to 108.0 MHz
[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)
[MW Tuner] Sensitivity 20 µV
[LW Tuner] Selectivity 50 µV
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
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0ºC to +40ºC
Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 150 mm
Mass (approx.) 1.3 kg (excluding accessories)
Front 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than
0.8% total harmonic distortion.
Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than
0.8% total harmonic distortion.
Treble ±10 dB at 10 kHz
TUNER SECTION
AM (MW) 522 kHz to 1 620 kHz
(LW) 144 kHz to 279 kHz
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 30 dB
Capture Ratio 1.5 dB
Selectivity 35 dB
CD PLAYER SECTION
Max. Bit Rate:320 Kbps
GENERAL
Panel Size (approx.) 188 mm × 58 mm × 11 mm
Design and specifications are subject to change without notice.
1-2 (No.MA051)
SECTION 3
DISASSEMBLY
3.1 Main body
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.
Front panel assembly
Detach button
Fig.1
Bottom cover
Joint b
Joint a
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
1-6 (No.MA051)
3.1.4 Removing the side panel
(See Fig.4)
• Prior to p erforming 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 remove 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, two screws E and screw F
attaching the rear bracket on the back side of the main
body.
(2) Remove the rear bracket.
Reference:
Insert the STEERING cable into the slot before attaching the
rear bracket to the main body.
C
Insert STEERING cable into the slot.
B
Side panel
Fig.4
D
D
C
Rear bracket
D
3.1.6 Removing the main board
(See Figs.5 and 6)
• Prior to performing the following procedures, remove the front
panel assembly, bottom cover and side panel.
• Remove the front chassis assembly as required.
(1) Remove the three screws D attaching the rear bracket on
the back side of the main body. (See Fig.5.)
(2) Remove the two screws G attaching the main board. (See
Fig.6.)
(3) Disconnect the connector CN501
the main body and take out the main board with the rear
bracket. (See Fig.6.)
Reference:
Remove the rear bracket from the main body as required. (See
“3.1.5 Removing the rear bracket”.)
on the main board from
G
E
CN501
EF
Fig.5
Main board
G
Rear bracket
Fig.6
(No.MA051)1-7
3.1.7 Removing the CD mechanism assembly
(See Fig. 7)
• Prior to performin g 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 front 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
panel 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 front 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
1-8 (No.MA051)
Joints f
Front board
Joints f
Fig.9
Joint g
Fig.10
Joint f
Front panel assembly
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
(No.MA051)1-9
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 instruction 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
1-10 (No.MA051)
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
(No.MA051)1-11
3.2.4 Removing the chassis unit
r
(See Figs.8 and 9)
• Prior to performing the follow ing 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
1-12 (No.MA051)
3.2.5 Removing the clamper assembly
(See Figs.10 and 11)
• Prior to p erforming 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
(No.MA051)1-13
3.2.6 Removing the loading / feed motor assembly
(See Figs.12 and 13)
• Prior to performing the follow ing 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 loadin g /
feed motor assembly to the flame as shown in Fig.12.
Loading / feed motor assembly
Fig.12
Loading / feed motor assembly
C
Fig.13
1-14 (No.MA051)
3.2.7 Removing the pickup unit
(See Figs.14 to 18)
• Prior to p erforming 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 p ickup uni t. 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
Pickup unit
Fig.14
Part e
E
Joint g
Feed rack
Fig.17
Pickup unit
Joint g
Joint f
Feed sw. holder
Fig.18
(No.MA051)1-15
3.2.9 Removing the trigger arm
r
(See Figs.19 and 20)
• Prior to performing the follow ing 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 follow ing 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
1-16 (No.MA051)
3.2.11 Removing the mode sw. / select lock arm
(See Figs.22 and 23)
• Prior to p erforming 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
(No.MA051)1-17
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