JVC EX-AK2DB User manual

SERVICE MANUAL
COPYRIGHT © 2008 Victor Company of Japan, Limited No.MB658<Rev.001>
2008/3
COMPACT COMPONENT SYSTEM
MB658<Rev.001>20083SERVICE MANUAL 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

1-2 (No.MB658<Rev.001>)
SPECIFICATION
EX-AK2DB
Designs and Specifications are subject to change without notice.
General
Power source AC 230 V~, 50 Hz
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
DVD player
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)
Video output
Color system PAL
Horizontal resolution 500 lines
Audio output
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 Ωto 16Ω
Headphones 11 mW/32 Ω
Fitting impedance 16 Ωto 1 kΩ
Subwoofer 500 mVrms/10 kΩ
Digital sound output
Optical -21 dBm to -15 dBm
Audio input
Sound input AUX ×1
Level 1 250 mV/50 kΩ
Level 2 500 mV/50 kΩ
Tuner (Digital Audio Broadcasting)
Band III tuner Receiving Frequency: 5A (174.928) - 13F(239.200) MHz
L-Band tuner Receiving Frequency: LA (1452.960) - LW(1490.624) MHz
Speaker
Type 1-way bass-reflex type
Magnetically shielded 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

(No.MB658<Rev.001>)1-3
SECTION 1
PRECAUTION
1.1 Safety 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.

1-4 (No.MB658<Rev.001>)
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 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 tocheck thecondition of the laser diode in the optical pickup. The tester'sinternal 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 specificdetails, 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 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.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Solder short land section

(No.MB658<Rev.001>)1-5
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.
REPRODUCTION AND POSITION OF LABELS and PRINT
!Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
WARNING LABEL and PRINT

1-6 (No.MB658<Rev.001>)
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 Aattaching the Top cover. (See
Fig.1)
(2) Takeouttwo washers B and two washers Con theTop cov-
er. (See Fig.2)
Fig.1
Fig.2
A
A
B
C

(No.MB658<Rev.001>)1-7
3.1.2 Removing the AL panel L and AL panel R (See Fig.3
to 5)
(1) Remove the two screws Dand two screws Eattaching the
Bridge A. (See Fig.3)
(2) Remove the two screws Fattaching the Bridge B. (See
Fig.3)
(3) Remove the two screws Gand three screws Hattaching
the bridge C. (See Fig.3, 4)
(4) Remove the two screws Jattaching the AL panel L and AL
panel R. (See Fig.3)
(5) Remove the two screws Kand six screws L attaching the
AL panel L and AL panel R. (See Fig.5)
Fig.3
Fig.4
Fig.5
D
JJ
E
F
E
F
G
G
H
LL
K

1-8 (No.MB658<Rev.001>)
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 Nattaching the Foot. (See Fig.6)
(3) Disengage two hooks aengaged both side of the Front
panel. (See Fig.7)
Fig.6
Fig.7
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 of the Micon board. (See Fig,8)
(2) Remove the eleven screws Pattaching the Rear panel.
(See Fig.9)
Fig.8
Fig.9
N
M
hook a
CN21
P
P

(No.MB658<Rev.001>)1-9
3.1.5 Removing the Switching power supply unit (see Fig.10)
(1) Disconnect the connector wire from Switching power sup-
ply unit connected to connector CN201 of the Main board.
(2) Remove the one screw Qattaching the Switching power
supply unit.
Fig.10
3.1.6 Removing the Headphone board (See Fig.11)
(1) Disconnect the connector wire from Main board connected
to connector CN443 of the Headphone board.
(2) Disconnect the earth wire from Bottom chassis connected
to post pin TP401 of the Headphone board.
(3) Remove the one screw Rattaching the Headphone board.
Fig.11
Q
CN201
TP401
CN443
R

1-10 (No.MB658<Rev.001>)
3.1.7 Removing the Main board (See Fig.12 to 14)
(1) Disconnect the card wire from Micon board connected to
connector CN202 of the Main board. (See Fig.12)
(2) Disconnect the card wire from DVD mechanism connected
to connector CN206 of the Main board. (See Fig.12)
(3) Disconnect the connector wires from Main board connect-
ed to connector CN102 and CN103 of the Digital amp
board. (See Fig.12)
(4) Remove the three screws Sattaching the Main board. (See
Fig.12)
(5) Disconnect the connector wires from Main board connect-
ed to connector CN713 and CN714 of the Micon board.
(See Fig.13)
(6) Disconnect the Earth wire from bottom chassis connected
to test point TP201 and TP204 of the Main board. (See
Fig.14)
Fig.12
Fig.13
Fig.14
SS
S
CN102
CN202
CN206
CN103
CN713
CN714
TP201
TP204

(No.MB658<Rev.001>)1-11
3.1.8 Removing the Micon board (See Fig.15)
(1) Disconnect the connector wire from Micon board connect-
ed to connector CN101 of the Digital amp board.
(2) Disconnect the card wire from SCART board connected to
connector CN711 of the Micon board.
(3) Disconnect the card wire from Loader board connected to
connector CN701 of the Micon board.
(4) Disconnect the card wire from Front end board connected
to connector CN708 of the Micon board.
(5) Remove the two screws Tattaching the Micon board.
Fig.15
3.1.9 Removing the Digital amp board (See Fig.16)
(1) Disconnect the connector wire from Digital amp board con-
nected to connector CN301 of the Speaker terminal board.
(2) Remove the one screw Uattaching the Digital amp board.
Fig.16
TT
CN711
CN701
CN708 CN101
CN301
U

1-12 (No.MB658<Rev.001>)
3.1.10 Removing the DVD mechanism (See Fig.17)
(1) Remove the three screws Vattaching the DVD mecha-
nism.
Fig.17
3.1.11 Removing the SCART board (See Fig.18)
(1) Remove the one screw Wattaching the SCART board.
Fig.18
3.1.12 Removing the Speaker terminal board (See Fig.18)
Remove the one screw X attaching the Speaker terminal board.
3.1.13 Removing the Front board (See Fig.19)
(1) Remove the volume knob.
(2) Remove the nine screws Yattaching the Front board.
Fig.19
V
VV
WX
Y
Y

(No.MB658<Rev.001>)1-13
3.2 DVD mechanism
3.2.1 Removing the traverse mechanism
(See Fig.1 to 6)
(1) Remove the two screws Aattaching the tramecha holder
from top side of DVD mechanism assembly. (See Fig.1)
(2) Remove the two screws Battaching the DVD module
board. (See Fig.2)
(3) Remove the four screws Cattaching the CB holder and
take out it. (See Fig.3)
(4) Remove the four screws Dattaching the traverse mecha-
nism. (See Fig.4)
(5) Solder the solder part of DVD pick up. (See Fig.5)
(6) Disconnect the card wire from CN101 and CN201 on the
DVD module board. (See Fig. 6)
Caution:
• Solder the short land section on the DVD pickup before dis-
connecting the card wire from the connector on the DVD
pickup.If thecard wire is disconnected without attaching sol-
ders, the pickup may be destroyed by static electricity.
• When attaching the DVD pickup, be sure to remove solders
from the short land section after connecting the card wire to
the connector on the DVD pickup.
Fig.1
Fig.2
A
A
Clamper base
DVD mechanism assembly
B
B
DVD module board
DVD mechanism assembly

1-14 (No.MB658<Rev.001>)
Fig.3
Fig.4
Fig.5
Fig.6
CC
C
C
DVD module board
DD
Traverse mechanism assembly
DVD mechanism assembly
Solder short land section
CN101
CN201
DVD module board

(No.MB658<Rev.001>)1-15
3.2.2 Removing the pickup assembly
(See Fig.7 to 11)
(1) Remove the tworod springs pressing the guide shaft. (See
Fig.7)
(2) Remove the screw Eand Fattaching the spring holder.
(See Fig.8)
(3) Remove the read screw from traverse mechanism assem-
bly. (See Fig.9)
Caution:
When remove the lead screw, do not loss the middle
gear. (See Fig.10 and 11)
(4) Remove the bar spring pressing the shaft. (See Fig.10)
(5) Take out the pickup assembly from traverse mechanism
chassis by order. (See Fig.11)
Fig.7
Fig.8
Fig.9
Fig.10
Fig.11
ROD SPRING ROD SPRING
EF
Spring holder
Lead screw
Middle gear
(T.TABLE)
HOOK
(SHAFT)
(BAR SPRING)
order 1
order 2 order 3

1-16 (No.MB658<Rev.001>)
3.2.3 Removing the feed motor assembly
(See Fig.12)
(1) Remove the one screw Gattaching the feed motor assem-
bly.
(2) Remove the feed motor wires from solder part of spindle
motor board.
Fig.12
3.2.4 Removing the spindle motor assembly
(See Fig.13)
(1) Remove the three screws Hattaching the spindle motor
from spindle motor board.
Fig.13
Lead screw
Middle gear
Solder part
G
Spindle motor
H

(No.MB658<Rev.001>)1-17
3.2.5 Removing the tray assembly
(See Fig.14 & 15)
(1) Remove the two screws Jattaching the clamper base.
(See Fig.14)
(2) Remove the one screw Kattaching the shaft guide from
bottom side. (See Fig.14)
(3) Remove the two screws Lattaching the shaft guide from
top side. (See Fig.15)
Caution:
When attach the tray assembly, boss of loading sub assembly
should attach to guide of bottom side at tray assembly. (See
Fig.15)
Fig.14
Fig.15
J
order 1
order 2
clamper base
K
[bottom side]
L

1-18 (No.MB658<Rev.001>)
SECTION 4
ADJUSTMENT
4.1 ATTENTION IN SERVICE OF DVD SECTION
(1) When pickup, Flash ROM ,DVD module board were changed, initialize EEPROM by all means.
(2) When full initialization was executed, execute learning with a DVD test disc by all means.
Test disc : VT-501, VT-502
Learning method : It is adjusted automatically by normal playback of a DVD disc.
4.2 DVD TEST MODE
4.2.1 Content of correspondence TEST MODE
(1) Version, Region, Learning status check mode
(2) NORMAL initialize, FULL initialize
(3) Device key checksum indication mode
(4) Micon version indication mode
(5) FL all on mode
(6) FRONT END check mode
4.2.2 Mode transition
TEST MODE into the press [PLAY] key and [STOP] key together of main body, connect the AC power.
After into the TEST MODE, mode select by [MENU] key.
(*1): Change form Version, Region, Learning status indication mode to NORMAL initialize, FULL initialize is effective only main body key.
The following keys are allocated when there are neither [>>|] key nor [|<<] key in the main body.
NORMAL initialize: PAUSE key
FULL initialize: STOP key 4sec long press
Device key write: PLAY key
When a basic key cannot be allocated by the set, it is assumed it is arbitrary.
4.2.3 Processing details
The communication of operated FL(LCD) display and DVD back end microcomputer is shown as follows.
*It is assumed to be OK to differ from the content of the specification because the number of digits is different according to the set for the FL(LCD) display.
*It is assumed to be OK to differ from the content of the specification because it also has the relation between arrangement and presence by the set also for
the key.
Version, Region, Learning
status indication mode
Micon version
indication mode
FRONT END
check mode
FL all on
mode
Device key
checksum
mode
NORMAL
initialize
FULL
initialize
Device key
write
PLAY+STOP+AC
MENU key
MENU key
MENU key
MENU key MENU key MENU key
[>>|] key(*1) [|<<] key(*1)
[STOP] key 4sec
long press(*1)
STEP Operation Movement RemarksFL(LCD)indication
JC#
132
132
46578
1
Version indication
The display to the version code is as
follows.
JC, 1U, D, E
2U, 3U, UB, UT
4U, UY, EE, UF
Region indication (# part)
Learning and Initialization from the back
end is displayed in the second line( )
of the FL display.
Blank indication at 0xFF
AC is pulled out, and
double press [PLAY]
and [STOP] key of the
main body
2Keep step 1, connect
AC
Version, Region, Learning
status indication mode
Power on by test mode,
version indication to FL
TEST

(No.MB658<Rev.001>)1-19
Learning status (first digit)
BCA CHECK OK incomplete,
DVD learning incomplete,
CD learning incomplete (indication 7)
BCA CHECK OK incomplete,
DVD learning complete,
CD learning incomplete (indication 6)
BCA CHECK OK incomplete,
DVD learning incomplete,
CD learning complete (indication 5)
BCA CHECK OK incomplete,
DVD learning complete,
CD leaning complete (indication 4)
BCA CHECK OK complete,
DVD learning incomplete,
CD learning incomplete (indication 3)
BCA CHECK OK complete,
DVD learning complete,
CD learning incomplete (indication 2)
BCA CHECK OK complete,
DVD learning incomplete,
CD learning complete (indication 1)
BCA CHECK OK complete
DVD learning complete
CD learning complete (indication 0)
(BCA READ CHECK result is only BCA
READ OK, it to complete)
Initialization status (second digit)
FULL initialize complete (indication 3)
NORMAL initialize complete (indication 0)
Initialize incomplete (blank indication)
The AVC protocol is returned from
high speed to normal speed.
(Return it to the normal mode when
coming off the TEST mode. )
Indicate CHECKSUM to FL
3 Press a [MENU] key of
the remote controller.
DEVICE CHECKSUM
indication mode
Indicate the CHECKSUM
of the Device key to FL
(4 byte)
Press a [MENU] key of
the remote controller.
FL all on mode
All FL and all LED to ON
JC#
Press a [>>|] key of the
main body.
NORMAL initialize
Continue pressing a
[STOP] key of the main
body.(4sec)
FULL initialize
TEST
JC#TEST
SU
SC
BE
M
## : Syscon Version
## : Syscon Romcorr Version
$$$$ : DVD Backend Version
4 Press a [MENU] key of
the remote controller.
Micon version indication
mode
Indicate the version of micon
to FL
Micon version indication
mode
Indicate the version of micon
to FL
5
Press a [ON SCREEN]
key of the remote
controller.
Press a [MENU] key of
the remote controller.
FRONT END check mode
Indicate the front end check
mode to FL
KCHEC
6
$$$$
STEP Operation Movement RemarksFL(LCD)indication
132
132
46578
,,,
,,,
: CPPM
: CPRM

1-20 (No.MB658<Rev.001>)
Upper : Laser current value
(BACKUP value,Real measured value)
Lower : 0
Upper : 0x01-0x04 (check port number)
Lower : 0
Press a [3] key of the
remote controller
Port check mode
(TRACK,INDEX,DEMP,COPY)
1:INDEX Port = High
2:TRACK Port = High
3:COPY Port = High
4:DEMP Port = High
Press a [4] key of the
remote controller
CD_LD lights and laser
current is displayed
POT
CLD
Upper : Laser current value
(BACKUP value,Real measured value)
Lower : 0
Press a [5] key of the
remote controller
DVD_LD lights and laser
current is displayed DLD
Upper : Laser current value
(BACKUP value,Real measured value)
Lower : Real measured value
Press a [6] key of the
remote controller
DVD_SL x1 jitter
measurement mode JIT
Upper Byte1 : Display option
0x00 : BACKUP area
0xFF : permanent area
Upper Byte2 : BACKUP memory address
(0x00-0x63)
Lower : Content of BACKUP memory
Press a [8] key of the
remote controller
Content of BACKUP
memory(0x00-0x63)
indication (FWD)
BUP
Upper : 0
Lower : Temperature sensor value
Press a [9] key of the
remote controller
Temperature sensor
(AD value) indication TMP
Upper : 0x00-0x06(measure at VT501)
Lower : Jitter value
Press a [10] key of the
remote controller
DVD-DL(parallel,opposite)
Search & jitter
measurement of the
specified position of
DVD-SL
-DL
Upper : 0x00-0x0C
Lower : 0
Press a [0] key of the
remote controller
MONITOR output switch
1: SRV_MONI_CIRC
2: SRV_MONI_SERVO
3-5: SRV_MONI_ANALOG
6-7: SRV_MONI_DRC
8-11: SRV_MONI_SERVO
_JIG
12: SRV_MONI_DEFAULT
MOT
Press a [ 10] key of the
remote controller
BCA READ CHECK
0:During BCA READ
1:BCA READ OK
2:BCA SEEK ERROR
3:BCA READ ERROR
4:SPINUP adjust ERROR
BCA
STEP Operation Movement RemarksFL(LCD)indication
132
132
46578
Upper : 0
Lower : WOBBLE detection result
Press a [2] key of the
remote controller
Presence of WOBBLE
0:WOBBLE_NO_CHECK
(un check)
1:WOBBLE_PRESS_MEDIA
(press)
2:WOBBLE_MINUS_MEDIA
(DVD-R/-RW media)
3:WOBBLE_PLUS_MEDIA
(DVD+R/+RW media)
WO B
Press a [1] key of the
remote controller
Disc startup and through
playback
(Playback starts from the
start position)
KCHEC
>
=