Jvc KD-S88-BTJ, KD-S48-J, KD-R729-BTUR, KD-R728-BTJ, KD-R726-UT Service Manual

SERVICE MANUAL

CD RECEIVER

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

		For
				For KD-A725, KD-R720,		For KD-R721BT, KD-R727BT
	KD-R721BT, KD-R727BT,		KD-R728BT, KD-S48, KD-S88BT			For KD-A725,
	KD-R728BT, KD-R729BT					KD-R720, 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-A725,

KD-R720, KD-R728BT,

KD-S48, KD-S88BT

For KD-A725, KD-R720,

KD-R721BT, KD-R726,

KD-R728BT, KD-R729BT,

KD-S48, KD-S88BT

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

COPYRIGHT © 2011 Victor Company of Japan, Limited

No.MA492<Rev.003>

2011/7

			SPECIFICATION
		KD-A725/KD-R720/KD-S48/KD-S88BT
AUDIO AMPLIFIER SECTION
Power Output	20 W RMS × 4 Channels at 4 Ω and ≤ 1% THD+N
Signal-to-Noise Ratio	80 dBA (reference: 1 W into 4 Ω)
Load Impedance	4 Ω (4 Ω to 8 Ω allowance)
Frequency Response	40 Hz to 20 000 Hz
Line-Out or Subwoofer-Out Level / Impedance	2.5 V/20 kΩ load (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)

•Subject to change without notice.

•If a kit is necessary for your car, consult your telephone directory for the nearest car audio speciality shop.

1-2 (No.MA492<Rev.003>)

	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 Ω to 8 Ω allowance)
Frequency Response	40 Hz to 20 000 Hz
Line-Out or Subwoofer-Out Level / Impedance	2.5 V/20 kΩ load (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)

• Subject to change without notice.

(No.MA492<Rev.003>)1-3

			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 Ω to 8 Ω allowance)
Frequency Response	40 Hz to 20 000 Hz
Line-Out or Subwoofer-Out Level / Impedance	5.0 V/20 kΩ load (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)
• Subject to change without notice.

1-4 (No.MA492<Rev.003>)

			KD-R728BT
AUDIO AMPLIFIER SECTION
Power Output	20 W RMS × 4 Channels at 4 Ω and ≤ 1% THD+N
Signal-to-Noise Ratio	80 dBA (reference: 1 W into 4 Ω)
Load Impedance	4 Ω (4 Ω to 8 Ω allowance)
Frequency Response	40 Hz to 20 000 Hz
Line-Out or Subwoofer-Out Level / Impedance	2.5 V/20 kΩ load (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)

•Subject to change without notice.

•If a kit is necessary for your car, consult your telephone directory for the nearest car audio speciality shop.

(No.MA492<Rev.003>)1-5

SECTION 1 PRECAUTION

1.1Safety Precautions

(1)This design of this product contains special hardware and many circuits and components specially for safety purposes. 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 performed 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 characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service 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 characteristics 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 reassembling.

(5)Leakage shock hazard testing

After reassembling the product, always perform an isolation check on the exposed metal parts of the product (antenna 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, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current 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, 1,000Ω per volt or more sensitivity in the following manner. Connect a 1,500Ω 10W resistor paralleled by a 0.15µF AC-type capacitor between an exposed metal part and a known good earth ground.

Measure the AC voltage across the resistor with the AC

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

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.).

	AC VOLTMETER
	(Having 1000
	ohms/volts,
	or more sensitivity)
0.15 F AC TYPE
	Place this
	probe on
1500 10W	each exposed
	metal part.

Good earth ground

1.2Warning

(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.

1.3Caution

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.

1.4Critical 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)