JVC FS-GD7 User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MB355
2005/5
COMPACT COMPONENT SYSTEM
MB35520055
FS-GD7
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

1-2 (No.MB355)
SPECIFICATION
Design and specifications are subject to change without notice.
Amplifier section Output Power 90 W per channel, min. RMS, driven into 6Ωat 1 kHz with no more
than 10% total harmonic distortion.
Analog input AUX Sensitivity/Impedance (at 1 kHz) 400 mV/47 kΩ
USB input USB Ver.1.1
Digital output OPTICAL DIGITAL OUT -21 dBm to -15 dBm (660 nm ±30 nm)
VIDEO OUT Color system NTSC
VIDEO (composite) 1 V(p-p)/75Ω
S-VIDEO Y (luminance):1 V(p-p)/75Ω
C (chrominance, burst):0.286 V(p-p)/75Ω
COMPONENT (Y):1 V(p-p)/75Ω
(PB/PR):0.7 V(p-p)/75Ω
Speaker terminals Impedance:6Ω- 16Ω
Tuner section FM tuning range 87.5 MHz - 108.0 MHz
AM tuning range 530 kHz - 1 710 kHz
Disc player section Playable disc DVD Video/DVD Audio
CD/VCD/SVCD
CD-R/CD-RW (recorded in Audio CD/Video CD/ Super Video CD/
MP3/ JPEG format)
DVD-R/DVD-RW (recorded in video format)
Horizontal resolution 500 lines
Wow and flutter Immeasurable
General Power requirement AC 120 V , 60 Hz
Power consumption 150 W (at operation)
26 W (on standby)
1.3 W (with deactivating the clock indication)
Dimensions (approx.) 189 mm ×224 mm ×406 mm
(7-1/2inch ×8-7/8inch ×16 inch)(W/H/D)
Mass (approx.) 6.5 kg (14.4 lbs)
Speakers Type 2-way Bass-reflex type
Magnetically shielded
Speaker systems Woofer 12 cm (4-3/4inch) cone ×1
Tweeter 4 cm (1-5/8inch) cone ×1
Power handling capacity 90 W
Impedance 6Ω
Frequency range 45 Hz - 20 000 Hz
Sound pressure level 84 dB/W·m
Dimensions (approx.) 165 mm ×286 mm ×237 mm
(6-/1/2inch ×11-5/16inch ×9-3/8inch)(W/H/D)
Mass (approx.) 2.8 kg (6.2 lbs) each

(No.MB355)1-3
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per-
formed by qualified personnel only.
(2) Alterations of the design or circuitry of the product should
not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety charac-
teristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or
other hazards.
(4) The leads in the products are routed and dressed with ties,
clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or
sharp edges for the prevention of electric shock and fire
hazard. When service is required, the original lead routing
and dress should be observed, and it should be confirmed
that they have been returned to normal, after reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna terminals, knobs, metal cabinet, screw heads,
headphone jack, control shafts, etc.) to be sure the product
is safe to operate without danger of electrical shock.Do not
use a line isolation transformer during this check.
• Plug the AC line cord directly into the AC outlet. Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal parts of the cabinet, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent must not exceed 0.5mA AC (r.m.s.).
• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex-
posed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant
safety standards.
(4) It is essential that safety critical components are replaced
by approved parts.
(5) If mains voltage selector is provided, check setting for local
voltage.
1.3 Caution
Burrs formed during molding may be left over on some parts
of the chassis.
Therefore, pay attention to such burrs in the case of pre-
forming repair of this system.
1.4 Critical parts for safety
In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical
for safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

1-4 (No.MB355)
1.5 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.
1.5.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
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.
(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.
1.6 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible
wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
Short-circuit
Pickup board
Card wire
Pickup board
CD changer mechanism
CD changer
mechanism holder

(No.MB355)1-5
1.8 Importance administering point on the safety
Caution: For continued protection against risk of
fire, replace only with same type 2.5 A/250 V for
F901.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F901 comme le meme type
que 2.5 A/250.
Ce sont des fusibles suretes qui functionnes rapide.
^

1-6 (No.MB355)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB355)1-7
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the side panel (R)/ (L)
(See Fig.1 to 3)
(1) Remove the three screws Aattaching the side panel (R) on
the back side and remove the screw Bon the right side.
(2) Remove the three screws Aattaching the side panel (L) on
the back side and remove the screw Bon the left side.
(3) Remove the side panel (R) and (L) backward.
Fig.1
Fig.2
Fig.3
A
A
Side panel (R) Side panel (L)
Top panel
Side panel (R)
B
BB
Side panel (R) B
BB

1-8 (No.MB355)
3.1.2 Removing the top panel
(See Fig.4 to 7)
• Prior to performing the following procedure, remove the side
panel (R)/(L).
(1) From the back of the body, remove the two screws Dat-
taching the top panel.
(2) From each side of the body, remove the two screws Eat-
taching the top panel.
(3) From each side of the body, release the two joints aof the
front panel assembly and top panel.
(4) Remove the top panel rearward while moving the rear side
of the top panel in the direction of the arrow.
Fig.4
Fig.5
Fig.6
Fig.7
Top panel
Rear panel Rear cover
D
Top panel
Front panel assembly
E
a
Top panel
Front panel assembly
E
a
Front panel assembly
CN601
Main board
CN402
Amp board
CN202

(No.MB355)1-9
3.1.3 Front panel assembly section
3.1.3.1 Removing the front panel assembly
(See Fig7 to 10)
• Prior to performing the following procedure, remove the side
panel (R)/(L) and the top panel.
(1) From top of the body, disconnect the wire from connector
CN202 on the amp board.
(2) From rear left side of the body, disconnect the wire from
connector CN402 on the main board.
(3) From the bottom of the body, remove the screw Fattaching
the front panel assembly.
(4) From each side of the body, remove the two screws Gat-
taching the front panel assembly.
(5) Release the two joints bon both lower sides of the body
and remove the front panel assembly forward while discon-
necting connector CN601 on the front side of the main
board.
Fig.8
Fig.9
Fig.10
Front panel assembly
F
Bottom
CN601 Main board
Front panel assembly
b
G
bG
Front panel assembly

1-10 (No.MB355)
3.1.3.2 Removing the LCD & function board
(See Fig.11)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Pull out the volume knob on the front side of front panel as-
sembly.
(2) Remove the eleven screws Hattaching the LCD & function
board.
Fig.11
3.1.3.3 Removing the AUDIO & AUX board
(See Fig.12)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws Jattaching the AUDIO & AUX
board.
3.1.3.4 Removing the PHONE board
(See Fig.12)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws Kattaching the PHONE board.
Fig.12
Front panel assembly
Volume konb
HH
H
H
LCD & zvfunction board
A
UDIO & AUX board PHONE board
JK

(No.MB355)1-11
3.1.4 Removing the power (single) board
(See Fig.13, 14)
• Prior to performing the following procedure, remove the side
panel (R)/(L) and the top panel.
(1) Disconnect the wire from connector CN901, CN902,
CN905 on the power (single) board.
(2) Disconnect the wire from connector on the amp board.
(3) Remove the two screws Mattaching the power (single)
board.
(4) Disconnect the connector CN906 and CN907 on the power
(single) board from the amp board while moving it in the di-
rection of the arrow.
Fig.13
Fig.14
Rear panel
CN902
CN901
CN906
CN907
Amp board
connector
Power (single) board
CN905
Rear panel Power (single) board
M
M
CN907
CN906

1-12 (No.MB355)
3.1.5 Removing the tuner pack
(See Fig.15)
• Prior to performing the following procedure, remove the side
panel (R)/(L) and the top panel.
(1) Disconnect the card wire from connector CN401 on the
main board.
(2) From the back of the body, remove the two screws Nat-
taching the tuner pack.
Fig.15
3.1.6 Removing the speaker board
(See Fig.16)
• Prior to performing the following procedure, remove the side
panel (R)/(L) and the top panel.
(1) From top of the body, disconnect the wire from connector
CN102 on the amp board.
(2) From the back of the body, remove the two screws Pat-
taching the speaker board.
Fig.16
Main board
CN401 Tuner pack
Rear panel
Rear coverzv
N
P
Rear panel
Amp board
Speaker board
Rear cover
Power (single) board

(No.MB355)1-13
3.1.7 Removing the rear cover/ rear panel
(See Fig.17 to 21)
• Prior to performing the following procedure, remove the side
panel (R)/ (L) and the top panel.
Reference:
You do not have to remove the tuner pack to remove the rear
cover/ rear panel.
(1) From top of the body, disconnect the wire from connector
CN205 on the amp board.
(2) From the back of the body, remove the five screws Qat-
taching the rear cover. The rear cover and the fan come off.
(3) From top of the body, disconnect the card wire from con-
nector CN401 on the main board.
(4) From the back of the body, remove the two screws Pand
the eight screws Rattaching the rear panel.
(5) From the back of the body, remove the four screws Tat-
taching the heat sink bracket.
(6) Release the two joints don both lower side of the rear pan-
el and remove the rear panel backward.
Fig.17
Fig.18
Rear panel
Tuner pack
Rear cover
Main board
CN401
Amp board
CN205
Rear panel
Raer cover
Q
QQ
Q

1-14 (No.MB355)
Fig.19
Fig.20
Fig.21
Rear panel Heat sink bracket
Heat sink
R
R
R
R
R
Base chassis
Rear panel
d
Base chassis
Rear panel
d

(No.MB355)1-15
3.1.8 Removing the fan
(See Fig.22 to 24)
• Prior to performing the following procedure, remove the side
panel (R)/(L), the top panel.
(1) From top of the body, disconnect the wire from connector
CN205 on the amp board.
(2) From the back of the body, remove the five screws Qat-
taching the rear cover.
(3) From the back of the body, remove the four screws Uat-
taching the fan.
Fig.22
Fig.23
Fig.24
Rear panel
Tuner pack
Rear cover Fan
Main board
CN401
Amp board
CN205
Rear panel
Raer cover
Q
QQ
Q
Fan
Rear cover
UU
U
U

1-16 (No.MB355)
3.1.9 Removing the main board
(See Fig.25, 26)
• Prior to performing the following procedure, remove the side
panel (R)/ (L), the top panel and the rear cover/ rear panel.
(1) Disconnect the card wire from connector CN501 and
CN502 on the main board and disconnect the wire from
connector CN402.
(2) From the right side of the body, remove the two screws Y
attaching the main board.
(3) Pull and disconnect connector CN403 and CN404 on the
main board from the amp board. Disconnect connector
CN601 on the main board from the front panel assembly
backward.
Fig.25
Fig.26
Front panel assembly
CN601
CN501
CN502
CN403
CN404
CN402
Main board
Y
Y
CN502
Main board
CN402
Front panel assembly
CN601
CN501
CN403
CN404

(No.MB355)1-17
3.1.10 Removing the power cord
(See Fig.27)
• Prior to performing the following procedure, remove the side
panel (R)/ (L), the top panel and the rear cover/ rear panel.
(1) Disconnect the wire from connector CN901 on the power
(single) board.
(2) Pull the power cord stopper out in the direction of the arrow
and remove it from the base chassis.
Fig.27
Base chassis
Power cord Power cord stopper
CN902
Power (single) board
CN901

1-18 (No.MB355)
3.1.11 Removing the amp board/ heat sink
(See Fig.28, 29)
• Prior to performing the following procedure, remove the side
panel (R)/ (L), the top panel and the rear cover/ rear panel.
(1) From top of the body, disconnect the wire from connector
CN202 on the amp board.
(2) From top of the body, remove the three screws A' and one
screw B' attaching the amp board.
(3) Remove the two screws D' and the three screws E' attach-
ing the heat sink.
Fig.28
Fig.29
CN202
Amp board
A
'
B' A'
A'
Amp board
Heat sink
D'
D'
E'

(No.MB355)1-19
3.1.12 Removing the power transformer assembly
(See Fig.30)
• Prior to performing the following procedure, remove the side
panel (R)/ (L), the top panel, the rear cover/ rear panel and the
main board / power (single) board / amp board.
(1) Remove the four screws F' attaching the power transform-
er assembly.
Fig.30
Power transformer assembly
F' F'
F'F'
Base chassis

1-20 (No.MB355)
3.1.13 CD changer mechanism assembly section
3.1.13.1 Removing the CD changer mechanism assembly
(See Fig.31 to 34)
• Prior to performing the following procedure, remove the side
panel (R)/(L), the top panel, the main board, the power (single)
board, the amp board.
(1) From both side of the body, remove the four screws G' at-
taching the CD changer mechanism cover and detach it in
the direction of the arrow.
(2) From the front side of the body, remove the two screws H'
attaching the CD changer mechanism assembly.
(3) From the back of the body, remove the two screws J' at-
taching the CD changer mechanism assembly.
(4) Remove the CD changer mechanism assembly in the di-
rection of the arrow while pulling the front and rear brackets
outward.
Caution:
To reattach the CD changer mechanism assembly, firstly fit the
point eof the bracket on the front side of the body to the notch
f of the CD changer mechanism assembly and reattach the
front side of the assembly.
Fig.31
Fig.32
Fig.33
Fig.34
CD changer mebhanism cove
r
CD changer mebhanism
assembly
Base chassis
G' G'
CD changer mebhanism cover CD changer mebhanism
assembly
Base chassis
G' G'
H'
H'
e
CD changer mechanism bracket
CD changer
mechanism bracket
f
Base chassis
CD changer mechanism assembly
CD changer mechanism assembly
CD changer mechanism bracket
J'
J'