Jvc EX-AK2-DB Service Manual

SERVICE MANUAL

MB658<Rev.001>20083SERVICE MANUAL

COMPACT COMPONENT SYSTEM

EX-AK2DB

COPYRIGHT © 2008 Victor Company of Japan, Limited

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

COPYRIGHT © 2008 Victor Company of Japan, Limited

No.MB658<Rev.001>

2008/3

SPECIFICATION

EX-AK2DB

General

Power source AC 230 V
Power consumption 24 W (in operation)

0.9 W (on standby)
Mass 3.1kg
External dimensions ( W × H × D) 232 mm × 100 mm × 269 mm

Playable discs/files DVD VIDEO, DVD AUDIO, DVD,VR, VCD, Super VCD, CD, CD-R/RW

(CD, VCD, MP3, WMA, WAV,JPEG, MPEG1, MPEG2 format),DVD-R/RW (video format)

Color system PAL
Horizontal resolution 500 lines

Analog sound output Speakers × 2
Output power (IEC 268-3) 60 W (30 W + 30 W) at 4 C (1 kHz/10% THD)
Fitting impedance 4 Ω to 16Ω
Headphones 11 mW/32 Ω
Fitting impedance 16 Ω to 1 kΩ
Subwoofer 500 mVrms/10 kΩ

Optical -21 dBm to -15 dBm

Sound input AUX × 1
Level 1 250 mV/50 kΩ
Level 2 500 mV/50 kΩ

Band III tuner Receiving Frequency: 5A (174.928) - 13F(239.200) MHz
L-Band tuner Receiving Frequency: LA (1452.960) - LW(1490.624) MHz

Type 1-way bass-reflex type

Magnetically shiel ded type
Speaker 8cm cone × 1
Power handling capacity 30 W
Impedance 4Ω
Sound pressure level 81 dB/Wzm
Dimension (W × H × D) 120 mm × 161 mm × 239 mm
Mass (1 unit ) 1.7 kg

~, 50 Hz

DVD player

Video output

Audio output

Digital sound output

Audio input

Tuner (Digital Audio Broadcasting)

Speaker

Designs and Specifications are subject to change without notice.

1-2 (No.MB658<Rev.001>)

1.1 Safety Precautions

SECTION 1

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.

(No.MB658<Rev.001>)1-3

1.2 Preventing static electricity

Electrostatic disc ha rge (ESD ), wh ic h oc cu rs w he n st ati c el ec tric ity sto r ed in th e bod y, f abri c, e tc. is d is cha rge d, ca n de st roy 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 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.

(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 ch eck the co ndition of th e laser dio de in the op tical pickup . The tester' s interna l power sourc e 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 nip pers, etc. aft er replacing the optical pi ckup. For sp ecific det ails, refer to the

replacement procedu re i n the text. Remove the an ti-s tat ic pin w he n re pl aci ng the traverse unit. Be c are ful 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 pickup unit.

• Apply solder to the short land before the card wire is disconnected from the connector on the pickup unit.
(If the card 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 after connecting the card wire.

Solder short land section

1-4 (No.MB658<Rev.001>)

1.5 Important for laser products

1.CLASS 1 LASER PRODUCT

2.CAUTION :

(For U.S.A.) Visible and/or invisible class II laser radiation
when open. Do not stare into beam.
(Others) Visible and/or invisible class 1M laser radiation
when open. Do not view directly with optical instruments.

3.CAUTION : Visible and/or invisible laser radiation when
open and inter lock failed or defeated. Avoid direct
exposure to beam.

4.CAUTION : This laser product uses visible and/or 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 and PRINT

WARNING LABEL and PRINT

(No.MB658<Rev.001>)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the Top cover (See Fig 1, 2)

(1) Remove the four screws A attaching the Top cover. (See

Fig.1)

(2) Takeout two washers B and two washers C on the Top cov-

er. (See Fig.2)

A

A

Fig.1

C

B

Fig.2

1-6 (No.MB658<Rev.001>)

3.1.2 Removing the AL panel L and AL panel R (See Fig.3
to 5)

(1) Remove the two screws D and two screws E attaching the

Bridge A. (See Fig.3)

(2) Remove the two screws F attaching th e Bridge B. (See

Fig.3)

(3) Remove the two screws G and three screws H attaching

the bridge C. (See Fig.3, 4)

(4) Remove the two screws J attaching the AL panel L a nd AL

panel R. (See Fig.3)

(5) Remove the two screws K and six screws L attaching the

AL panel L and AL panel R. (See Fig.5)

G

F

G

F

E

E

D

JJ

Fig.3

H

Fig.4

K

LL

Fig.5

(No.MB658<Rev.001>)1-7

3.1.3 Removing the Front panel (See Fig.6, 7)

(1) Remove the two screws M attaching the Foot. (See Fig.6)
(2) Remove the three screws N attaching the Foot. (See Fig.6)
(3) Disengage two hooks a engaged both side of the Front

panel. (See Fig.7)

N

M

Fig.6

hook a

3.1.4 Removing the Rear panel (with DAB tuner pack) (See Fig.8, 9)

(1) Disconnect the card wire from DAB tuner pack connected

to connector CN21

(2) Remove the eleven screws P attaching the Rear panel.

(See Fig.9)

of the Micon board. (See Fig,8)

CN21

Fig.7

P

P

Fig.9

1-8 (No.MB658<Rev.001>)

Fig.8