JVC KD-A725J User manual

SERVICE MANUAL
COPYRIGHT © 2011 Victor Company of Japan, Limited No.MA492<Rev.003>
2011/7
CD RECEIVER
MA492<Rev.003>20117SERVICE MANUAL
KD-A725J, KD-R720J, KD-R721BTE,
KD-R721BTEU, KD-R721BTEY, KD-R726U,
KD-R726UH, KD-R726UT, KD-R727BTEE,
KD-R728BTJ, KD-R729BTUR, KD-S48J,
KD-S88BTJ
COPYRIGHT © 2011 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
For KD-A725,
KD-R720, KD-S48,
KD-S88BT
For
KD-R721BT, KD-R727BT,
KD-R728BT, KD-R729BT
For KD-A725, KD-R720,
KD-R721BT, KD-R726,
KD-R728BT, KD-R729BT,
KD-S48, KD-S88BT
For KD-A725,
KD-R720, KD-R728BT,
KD-S48, KD-S88BT
For KD-A725, KD-R720,
KD-R728BT, KD-S48, KD-S88BT
For KD-A725, KD-R720, KD-R726, KD-S48,KD-S88BT For KD-R721BT, KD-R727BT, KD-R728BT, KD-R729BT
For KD-R721BT, KD-R727BT

1-2 (No.MA492<Rev.003>)
SPECIFICATION
• Subject to change without notice.
• If a kit is necessary for your car, consult your telephone directory for the nearest car audio speciality shop.
KD-A725/KD-R720/KD-S48/KD-S88BT
AUDIO AMPLIFIER SECTION
Power Output 20 W RMS ×4 Channels at 4 Ωand ≤1% THD+N
Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 Ω)
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Frequency Response 40 Hz to 20 000 Hz
Line-Out or Subwoofer-Out Level / Impedance 2.5 V/20 kΩload (full scale)
Output Impedance ≤600 Ω
Other Terminal
AUX (auxiliary) input jack, USB input terminal, USB rear cable, Expansion port, Antenna terminal
TUNER SECTION
Frequency Range FM with channel interval set to 200 kHz 87.9 MHz to 107.9 MHz
50 kHz 87.5 MHz to 108.0 MHz
AM with channel interval set to 10 kHz 530 kHz to 1 700 kHz
9 kHz 531 kHz to 1 611 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 µV/75Ω)
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: 40 dB
AM Tuner Sensitivity/Selectivity 20 µV/40 dB
CD PLAYER SECTION
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
Signal-to-Noise Ratio 98 dB
102 dB (For KD-S48)
Wow and Flutter Less than measurable limit
MP3 Decoding Format (MPEG1/2 Audio Layer 3)
Max. Bit Rate 320 kbps
WMA (Windows Media
(R)
Audio) Decoding Format Max. Bit Rate 320 kbps
USB SECTION
USB Standard USB 1.1, USB 2.0
Data Transfer Rate (Full Speed) Max. 12 Mbps
Compatible Device Mass Storage Class (except HDD)
Compatible File System FAT 32/ 16/ 12
Playable Audio Format MP3/ WMA/ WAV
Max. Current DC 5 V 1 A
Output Power (For KD-S48) DC 5 V 1 A , USB input terminal (front/rear)
BLUETOOTH SECTION
Version Bluetooth 2.1 certified (+EDR)
Profile HFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3, PBAP 1.0
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0°C to +40°C (32°F to 104°F)
Dimensions (W×H ×D) : (approx.) Installation Size 182 mm ×52 mm ×158 mm (7-3/16” ×2-1/16” ×6-1/4”)
Panel Size 188 mm ×59 mm ×9 mm (7-7/16” ×2-3/8” ×3/8”)
Mass 1.3 kg (2.9 lbs) (excluding accessories)

(No.MA492<Rev.003>)1-3
•Subject to change without notice.
KD-R721BT, KD-R727BT, KD-R729BT
AUDIO AMPLIFIER SECTION
Maximum Power Output 50 W per channel
Continuous Power Output (RMS)
20 W per channel into 4 Ω , 40 Hz to 20 000 Hz at no more than 1% total harmonic distortion.
Signal-to-Noise Ratio 70 dB
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Frequency Response 40 Hz to 20 000 Hz
Line-Out or Subwoofer-Out Level / Impedance 2.5 V/20 kΩload (full scale)
Output Impedance ≤600 Ω
Other Terminal
USB input terminal, USB rear cable, Auxiliary input jack, Antenna input
TUNER SECTION
Frequency Range FM 87.5 MHz to 108.0 MHz
LW [For KD-R727] 65.0 MHz to 74.0 MHz
AM MW 531 kHz to 1 611 kHz
LW 153 kHz to 279 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 µV/75Ω)
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: 40 dB
MW Tuner Sensitivity/Selectivity 20 µV/40 dB
LW Tuner Sensitivity 50 µV
CD PLAYER SECTION
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
Signal-to-Noise Ratio 102 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format (MPEG1/2 Audio Layer 3) Max. Bit Rate: 320 kbps
WMA (Windows Media
(R)
Audio) Decoding Format Max. Bit Rate: 192 kbps
USB SECTION
USB Standard USB 1.1, USB 2.0
Data Transfer Rate (Full Speed) Max. 12 Mbps
Compatible Device Mass Storage Class (except HDD)
Compatible File System FAT 32/ 16/ 12
Playable Audio Format MP3/ WMA/ WAV
Output Power DC 5 V 1 A, USB input terminal (front/rear)
BLUETOOTH SECTION
Version Bluetooth 2.1 certified (+EDR)
Power Class Class 2 Radio
Service Area 10 m
Profile HFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3, PBAP 1.0
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0°C to +40°C
Dimensions (W×H ×D) : (approx.) Installation Size 182 mm ×52 mm ×158 mm
Panel Size 188 mm ×59 mm ×9 mm
Mass 1.3 kg (excluding accessories)

1-4 (No.MA492<Rev.003>)
• Subject to change without notice.
KD-R726
AUDIO AMPLIFIER SECTION
Maximum Power Output 50 W per channel
Continuous Power Output (RMS)
20 W per channel into 4 Ω , 40 Hz to 20 000 Hz at no more than 1% total harmonic distortion.
Signal-to-Noise Ratio 70 dB
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Frequency Response 40 Hz to 20 000 Hz
Line-Out or Subwoofer-Out Level / Impedance 5.0 V/20 kΩload (full scale)
Output Impedance ≤600 Ω
Other Terminal
USB input terminal, USB rear cable, Auxiliary input jack, Antenna input
TUNER SECTION
Frequency Range FM 87.5 MHz to 108.0 MHz
AM 531 kHz to 1 611 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 µV/75Ω)
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: 40 dB
AM Tuner Sensitivity/Selectivity 20 µV/40 dB
CD PLAYER SECTION
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
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format (MPEG1/2 Audio Layer 3) Max. Bit Rate: 320 kbps
WMA (Windows Media
(R)
Audio) Decoding Format Max. Bit Rate: 320 kbps
USB SECTION
USB Standard USB 1.1, USB 2.0
Data Transfer Rate (Full Speed) Max. 12 Mbps
Compatible Device Mass Storage Class (except HDD)
Compatible File System FAT 32/ 16/ 12
Playable Audio Format MP3/ WMA/ WAV
Max. Current DC 5 V 1 A
BLUETOOTH SECTION
Version Bluetooth 2.1 certified (+EDR)
Profile HFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3, PBAP 1.0
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0°C to +40°C
Dimensions (W×H ×D) : (approx.) Installation Size 182 mm ×52 mm ×158 mm
Panel Size 188 mm ×59 mm ×9 mm
Mass 1.3 kg (excluding accessories)

(No.MA492<Rev.003>)1-5
• Subject to change without notice.
•If a kit is necessary for your car, consult your telephone directory for the nearest car audio speciality shop.
KD-R728BT
AUDIO AMPLIFIER SECTION
Power Output 20 W RMS ×4 Channels at 4 Ωand ≤1% THD+N
Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 Ω)
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Frequency Response 40 Hz to 20 000 Hz
Line-Out or Subwoofer-Out Level / Impedance 2.5 V/20 kΩload (full scale)
Output Impedance ≤600 Ω
Other Terminal
AUX (auxiliary) input jack, USB input terminal, USB rear cable, Antenna terminal
TUNER SECTION
Frequency Range FM
with channel interval set to 200 kHz 87.9 MHz to 107.9 MHz
50 kHz 87.5 MHz to 108.0 MHz
AM
with channel interval set to 10 kHz 530 kHz to 1 700 kHz
9 kHz 531 kHz to 1 611 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 µV/75Ω)
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: 40 dB
AM Tuner Sensitivity/Selectivity 20 µV/40 dB
CD PLAYER SECTION
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
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format (MPEG1/2 Audio Layer 3) Max. Bit Rate: 320 kbps
WMA (Windows Media
(R)
Audio) Decoding Format Max. Bit Rate: 320 kbps
USB SECTION
USB Standard USB 1.1, USB 2.0
Data Transfer Rate (Full Speed) Max. 12 Mbps
Compatible Device Mass Storage Class (except HDD)
Compatible File System FAT 32/ 16/ 12
Playable Audio Format MP3/ WMA/ WAV
Max. Current DC 5 V 1 A
BLUETOOTH SECTION
Version Bluetooth 2.1 certified (+EDR)
Power Class Class 2 Radio
Service Area 10 m (10.9 yd)
Profile HFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3, PBAP 1.0
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0°C to +40°C (32°F to 104°F)
Dimensions (W×H ×D) : (approx.) Installation Size 182 mm ×52 mm ×158 mm (7-3/16” ×2-1/16” ×6-1/4”)
Panel Size 188 mm ×59 mm ×9 mm (7-7/16” ×2-3/8” ×3/8”)
Mass 1.3 kg (2.9 lbs) (excluding accessories)

1-6 (No.MA492<Rev.003>)
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

(No.MA492<Rev.003>)1-7
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 card wire is disconnected from the connector on the servo board. (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 sections after connecting the card wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
SOLDER

1-8 (No.MA492<Rev.003>)
1.8 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

(No.MA492<Rev.003>)1-9
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 KD-S88BTJ
The KD-S88BTJ is packaged products of a CD RECEIVER and a BLUETOOTH ADAPTER+Microphone.
SECTION 3
DISASSEMBLY
3.1 Main body (Used model : KD-R720)
3.1.1 Removing the Bottom chassis (See Fig.1)
(1) Disengage the seven hooks aengaging the Bottom chas-
sis.
(2) Slide the Bottom chassis backward to remove it.
Fig.1
3.1.2 Removing the Front chassis (See Fig.2)
(1) Disengage the four hooks bengaging both sides of the
Front chassis.
Fig.2
3.1.3 Removing the Main board (See Fig.3, 4 and 5)
(1) Remove the one screw Aattaching the Rear Bracket. (See
Fig.3)
Fig.3
(2) Remove the two screws Battaching both sides of the Top
chassis. (See Fig.4)
Fig.4
(3) Remove the three screws Cattaching the Main board. (See
Fig.5)
Fig.5
CD RECEIVER BLUETOOTH ADAPTER
KD-R720J KS-UBT1+ Microphone
hook a
hook a
hook a
hook b
A
B
C

1-10 (No.MA492<Rev.003>)
(4) Disconnect the board to board connector CN502 connect-
ing the Main board and the CD mechanism. (See Fig.6)
Fig.6
3.1.4 Removing the CD mechanism (See Fig.7)
(1) Remove the three screws Dattaching the CD mechanism.
Fig.7
3.1.5 Removing the Switch board (See Fig.8)
(1) Remove the Volume knob.
(2) Remove the four screws Eattaching the Rear cover.
(3) Disengage the thirteen hooks cengaging the Rear cover.
Fig.8
3.2 CD mechanism assembly section
3.2.1 Removing the Mecha control board
(1) Solder the short land on the pickup. (See Fig. 1)
Fig.1
(2) Remove the eight wires from the Mecha control board.
(See Fig.2)
Fig.2
(3) Disconnect the flexible wire from the pickup connected to
the connector CN102 on the Mecha control board. (See
Fig.3)
(4) Remove the two screws Aattaching the Mecha control
board. (See Fig.3)
Fig.3
CN502
D
D
D
hook c
hook c
EE
SOLDER
BLACK
RED
WHITE
ORANGE
ORANGE
WHITE
YELLOW
YELLOW
CN102
A

(No.MA492<Rev.003>)1-11
3.2.2 Removing the Traverse mechanism (See Fig.4, 5)
(1) Remove the five springs from the traverse mechanism.
(See Fig.4)
Fig.4
(2) Remove the three screws Battaching the bottom frame as-
sembly. (See Fig.5)
(3) Remove the three dumpers from the bottom frame assem-
bly. (See Fig.5)
Fig.5
3.2.3 Removing the Pickup (See Fig.6, 7)
(1) Remove the two screws Cattaching the feed bracket as-
sembly. (See Fig.6)
Fig.6
(2) Remove the shaft from the TM base. (See Fig.7)
(3) Disengage the hook aon the pickup from the TM base.
(See Fig.7)
Fig.7
3.2.4 Removing the Spindle motor (See Fig.8. 9)
(1) Remove the HC CL. Spring from the HC CL. base and the
TM base, and then lift up the HC CL. base. (See Fig.8)
Fig.8
B
B
CC
shaft
[ SIDE VIEW ]
HC CL. spring

1-12 (No.MA492<Rev.003>)
(2) Remove the HC CL. base from th holes on the TM base.
(See Fig.9)
Fig.9
(3) Remove the two screws Dattaching the spindle motor.
(See Fig.10)
Fig.10
3.2.5 Removing the Loading motor
(1) Remove the roller arm assembly from the bottom frame as-
sembly. (See Fig.11)
Fig.11
(2) Remove the two screws Eattaching the loading motor as-
sembly, and then remove the loading motor assembly in
the direction of the arrow. (See Fig.12)
Fig.12
D
E

(No.MA492<Rev.003>)1-13
SECTION 4
ADJUSTMENT
4.1 Test instruments required for adjustment
(1) Digital oscilloscope (100MHz)
(2) Digital tester
(3) Test Disc
4.2 Standard measuring conditions
Power supply voltage DC14.4V(10.5 to 16V)
Load impedance 20K ohm (2 Speakers connection)
Output Level Line out 2.5V (Vol. MAX)
4.3 Standard volume position
Balance and Bass &Treble volume : lndication"0"
Loudness : OFF
4.4 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 sincedirect reading of
figures are applied in this working standard.
4.5 How to connect the 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.
Original cable

1-14 (No.MA492<Rev.003>)
4.6 Service Mode
• Operating key: [MENU] →[DOWN] (3 sec)
• Navigation key : Press [SEL] in any main display item to select that option.
• Volume knob turn : forward and backward selection.
INIT ALL Initialize all data to factory shipment state.
MECHA DISP CD mechanism No.
RUNNING 1 For use in running tests. (Only factory use)
RUNNING 2 For use in running tests. (Only factory use)
CD ERROR Display the CD Error past record stored in EEPROM.
Total Error
Latest 3 errors recorded
The first 5 errors recorded
CLR ERR Clear CD Error history from EEPROM.
CDSERV MODE *Only engineering use.

(No.MA492<Rev.003>)1-15
4.7 Tuner service mode
4.7.1 Key operation (FM and AM mode)
• Enter service mode: [SEL] →[MENU] (3 sec)
• Exit service mode: press [ENTER] (SEL) key.
• Go to next item: press [DISP] key
• Back to previous item: press [BACK] key
VER=#*** MICON version display
# indicates destination: J=USA, U=OTHERS (eg. ASIA), R=EUROPE, E=EASTERN EUROPE
*** indicates version No.
TCC-*** Bluetooth control software version.
######## Tuner device and version identification display
Display :TOM V2 for TOMIC V2 tuner.
Display: ATOM V5 for ATOMIC V5 tuner.
TINJ= ## Tuner injection indicator
"##" indicates current tuner injection.
PI =#### PI display of receiving station, "####" indicates PI code.
PTY=## PTY display of receiving station (00~29), "##" indicates PTY code.
TP=#TA=* TP, TA display of receiving station
"#" indicates TP ON/OFF: 1=ON; 0=OFF;
"*" indicates TA ON/OFF: 1=ON; 0=OFF.
MS=#DI=* M/S, DI display of receiving station
"#" indicates M/S ON/OFF: 1=ON; 0=OFF;
"*" indicates DI ON/OFF: 1=ON; 0=OFF.
AF=#### Display the contents of AF memory (by scrolling) "####" indicate AF frequencies.
LEV= ##H Fieldstrength indicator.
U&W= ##H Adjacent and Multipath noise level indicator.
IFC= ##H IFCOUNTER result indicator.
IFBW= # FM IF filter bandwidth indicator.
RFAGC=## FM RF AGC resulting attenuation.
IFAGC=## FM IF AGC resulting attenuation.
##** CLOCK display of receiving station (Original DISP key operation)
######## FOR RDS ONLY
PS NAME display of receiving station (Original DISP key operation)
##### FREQUENCY display of receiving station (Original DISP key operation)
㪝㪦㪩㩷㪩㪛㪪㩷㪦㪥㪣㪰

1-16 (No.MA492<Rev.003>)
SECTION 5
TROUBLESHOOTING
5.1 16PIN CORD DIAGRAM
• For KD-A725,KD-R720,KD-R728BT
YL
BK
GN
VI
GN / BK
VI / BK
WH
GY
GY / BK
WH / BK
RD
OR / WH
6
1
11
16
12
9
7
5
10
8
15
2
3
BL / WH
WH
RD
BK
BL
GN
VI
YL
Green
Gray Yellow
OrangeOR
Violet
White
Blue
Red
Black
GY
8
7
6
5
16
15
134
3
2
1
12
11
10
9
BK
RD
WH GN
VIGY
BL/WH
GN/BK
VI/BK
GY/BK
YL
NC
WH/BK
NC
14
OR/WH
LB/YL
LB / YL
13
LB Light Blue

(No.MA492<Rev.003>)1-17
• For KD-R721BT
RD 1
YL 1
BK
BL / WH
OR / WH
RD 3 RD 2
YL 2
15
16
14
12
2
16
1
3
7
1
5
6
3
8
2
4
15
11
12
10
9
6
5
7
8
GY / BK
GY
WH / BK
WH
VI / BK
VI
GN / BK
GN
BK
RD
BL
WH
VI
Black
Red
Blue
White
Violet
GN
GY Gray
YL Yellow
Green
OR Orange
8
7
6
5
16
15
13
4
3
2
1
12
11
10
9
BK
RD1
WH GN
VI
GY
BL/WH
GN/BK
VI/BK
GY/BK
YL1
NC
WH/BK
NC
LB/YL
OR/WH
14
13
LB Light Blue
VI
GY
WH
GN
NC
NC
NC
YL2
BK
OR/WH
VI/BK
GY/BK
WH/BK
GN/BK
BL/WH
LB / YL
13
RD2
2
1
34
56
78
910
11 12
13 14
15 16

1-18 (No.MA492<Rev.003>)
•ForKD-R726
YL
BK
GN
VI
GN / BK
VI / BK
WH
GY
GY / BK
WH / BK
RD
OR / WH
6
1
11
16
12
9
7
5
10
8
15
2
3
BL / WH
WH
RD
BK
LB
GN
VI
YL
Green
Gray
Yellow
OrangeOR
Violet
White
Light Blue
Red
Black
GY
8
7
6
5
16
15
134
3
2
1
12
11
10
9
BK
RD
WH GN
VIGY
BL/WH
GN/BK
VI/BK
GY/BK
YL
WH/BK
LB/YL
14
OR/WH
NC
13
LB / YL
BL Blue
BL
BL
4

(No.MA492<Rev.003>)1-19
• For KD-R727BT
RD 1
YL 1
BK
BL / WH
OR / WH
RD 3 RD 2
YL 2
15
16
14
12
2
16
1
3
7
1
5
6
3
8
2
4
15
11
12
10
9
6
5
7
8
GY / BK
GY
WH / BK
WH
VI / BK
VI
GN / BK
GN
BK
RD
BL
WH
VI
Black
Red
Blue
White
Violet
GN
GY Gray
YL Yellow
Green
OR Orange
8
7
6
5
16
15
13
4
3
2
1
12
11
10
9
BK
RD1
WH GN
VI
GY
BL/WH
GN/BK
VI/BK
GY/BK
YL1
NC
WH/BK
NC
NC
OR/WH
14
13
VI
GY
WH
GN
NC
NC
NC
YL2
BK
OR/WH
VI/BK
GY/BK
WH/BK
GN/BK
BL/WH
RD2
2
1
34
56
78
910
11 12
13 14
15 16

(No.MA492<Rev.003>)
VSE
Printed in Japan
Victor Company of Japan, Limited
J&K Car Electronics Corporation 2967-3, Ishikawa-machi, Hachioji-shi, Tokyo, 192-8525, Japan