* Please refer to the mechanism manual (model TN2007-1010 (No.MY005 and No.MY005B)) for the CD mechanism.
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)
Power Output20 W RMS × 4 Channels at 4 Ω and [< or =] 1% THD+N
Signal to Noise Ratio80 dBA (reference: 1 W into 4 Ω)
Load Impedance4 Ω (4 Ω to 8 Ω allowance)
WMA (Windows Media® Audio) Decoding FormatMax. Bit Rate: 192 kbps
AAC (Advanced Audio Coding) Decoding FormatMax. Bit Rate: 320 kbps
USB StandardUSB 1.1
Data Transfer RateFull SpeedMaximum 12 Mbps
Compatible DeviceMass storage class, MTP
Compatible File SystemFAT 32/16/12
Playable Audio FormatMP3/WMA/AAC/WAV
Max. Current:Less than 500 mA
Power RequirementOperating VoltageDC 14.4 V (11 V to 16 V allowance)
Grounding SystemNegative ground
Allowable Operating Temperature0°C to +40°C
Dimensions (W × H × D)
(approx.)
Mass2.3 kg (excluding accessories)
Front and rear19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total har-
monic distortion.
Mid-range±12 dB at 1 kHz
Treble±12 dB at 10 kHz
TUNER SECTION
FM365.00 MHz to 74.00 MHz
AM(MW) 522 kHz to 1 620 kHz
(LW) 144 kHz to 279 kHz
50 dB Quieting Sensitivity16.3 dBf (1.8 µV/75 Ω)
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response40 Hz to 15 000 Hz
Stereo Separation30 dB
Selectivity35 dB
CD PLAYER SECTION
Compact disc player
Non-contact optical pickup (semiconductor laser)
USB DEVICE
Low SpeedMaximum 1.5 Mbps
GENERAL
Installation Size182 mm × 111 mm × 158 mm
Set Size178 mm × 100 mm × 178 mm
Design and specifications are subject to change without notice.
1-6 (No.MA346)
1.1Safety 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.MA346)1-7
1.2Preventing 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.
(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.
1.3Handling 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.
1.4Attention 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.
Pickup
Wires
Push switch
Base board
1-8 (No.MA346)
Frame
Flexible wire
Connector
CD mechanism
assembly
Pickup
1.5Important 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.MA346)1-9
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-10 (No.MA346)
SECTION 3
DISASSEMBLY
3.1Main body
3.1.1 Removing the FRONT PANEL assembly
(See Fig.1)
(1) From the bottom side of main body, remove the two screws
A attaching the both side of the FRONT PANEL assembly.
(2) Disengage two hooks a engaged CHASSIS assembly.
3.1.2 Removing the HEAT SINK
(See Fig.2)
(1) Remove the five screws B and one screw C attaching the
HEAT SINK.
hookahooka
A
Fig.1
BBC
Fig.2
(No.MA346)1-11
3.1.3 Removing the REAR BRACKET
(See Fig.3)
(1) Remove the seven screws D, two screws E and one screw
F attaching the REAR BRACKET.
D
E
3.1.4 Removing the BOTTOM CHASSIS assembly
(See Fig.4)
(1) Remove the four screws G attaching the BOTTOM CHAS-
SIS assembly.
DD
Fig.3
F
GG
Fig.4
1-12 (No.MA346)
3.1.5 Removing the FUNC BOARD assembly
(See Fig.5)
(1) Remove the one screw H attaching the FUNC BOARD as-
sembly.
(2) Disconnect the connecter wire from MAIN BOARD assem-
bly connected to connector CN322
assembly.
(3) Straighten hook b attaching the FUNC BOARD assembly.
3.1.6 Removing the MIDDLE CHASSIS
(See Fig.5)
(1) Remove the four screws J attaching the MIDDLE CHAS-
SIS.
(2) Disconnect the connector CN501
MIDDLE CHASSIS from the CD mechanism assembly in
an upward direction.
3.1.7 Removing the MAIN BOARD assembly
(See Fig.6)
(1) Remove the four screws K attaching the MAIN BOARD as-
sembly.
of the FUNC BOARD
of the main board on the
CN322
CN501
hook
JJ
b
H
Fig.5
K
K
Fig.6
(No.MA346)1-13
3.1.8 Removing the CD MECHANISM assembly
(See Fig.7)
(1) Remove the three screws L attaching the CD MECHA-
NISM assembly.
3.1.9 Removing the SWITCH BOARD assembly
(See Fig.8)
(1) Remove the volume knob from the front side of the FRONT
PANEL assembly.
(2) Remove the thirteen screws M and two screws N attaching
the SWITCH BOARD assembly.
L
L
Fig.7
MM
N
3.2CD mechanism assembly
For CD mechanism, please refer the MECHANISM MANUAL TN2007-1010 (No.MY005
1-14 (No.MA346)
M
Fig.8
and No.MY005B).
SECTION 4
ADJUSTMENT
4.1Adjustment method
4.1.1 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
4.1.5 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.
4.1.2 Standard measuring conditions
Power supply voltage : DC14.4V(11 to 16V)
Load impedance : 20K.(2 Speakers connection)
Output Level : Line out 2.5V (Vol. MAX)
4.1.3 Standard volume position
Balance and Bass &Treble volume : lndication"0"
Loudness : OFF
4.1.4 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.