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1、SERVICE MANUAL COPYRIGHT 2011 Victor Company of Japan, Limited No.MA492 2011/7 CD RECEIVER MA49220117 SERVICE 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 Jap
2、an, 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 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 K
6、D-A725, KD-R720, KD-R728BT, KD-S48, KD-S88BT For KD-A725, KD-R720, KD-R726, KD-S48,KD-S88BTFor KD-R721BT, KD-R727BT, KD-R728BT, KD-R729BT For KD-R721BT, KD-R727BT RadioFans.CN 收音机爱 好者资料库 1-2 (No.MA492) SPECIFICATION Subject to change without notice. If a kit is necessary for your car, consult your t
7、elephone directory for the nearest car audio speciality shop. KD-A725/KD-R720/KD-S48/KD-S88BT AUDIO AMPLIFIER SECTION Power Output20 W RMS 4 Channels at 4 and 1% THD+N Signal-to-Noise Ratio80 dBA (reference: 1 W into 4 ) Load Impedance4 (4 to 8 allowance) Frequency Response40 Hz to 20 000 Hz Line-Ou
8、t or Subwoofer-Out Level / Impedance2.5 V/20 k load (full scale) Output Impedance 600 Other TerminalAUX (auxiliary) input jack, USB input terminal, USB rear cable, Expansion port, Antenna terminal TUNER SECTION Frequency RangeFMwith channel interval set to 200 kHz87.9 MHz to 107.9 MHz 50 kHz87.5 MHz
9、 to 108.0 MHz AMwith channel interval set to 10 kHz530 kHz to 1 700 kHz 9 kHz531 kHz to 1 611 kHz FM TunerUsable Sensitivity9.3 dBf (0.8 V/75) 50 dB Quieting Sensitivity16.3 dBf (1.8 V/75 ) Alternate Channel Selectivity (400 kHz) 65 dB Frequency Response40 Hz to 15 000 Hz Stereo Separation:40 dB AM
10、TunerSensitivity/Selectivity20 V/40 dB CD PLAYER SECTION TypeCompact disc player Signal Detection SystemNon-contact optical pickup (semiconductor laser) Number of Channels2 channels (stereo) Frequency Response5 Hz to 20 000 Hz Signal-to-Noise Ratio98 dB 102 dB (For KD-S48) Wow and FlutterLess than m
11、easurable limit MP3 Decoding Format (MPEG1/2 Audio Layer 3) Max. Bit Rate320 kbps WMA (Windows Media(R) Audio) Decoding Format Max. Bit Rate320 kbps USB SECTION USB StandardUSB 1.1, USB 2.0 Data Transfer Rate (Full Speed)Max. 12 Mbps Compatible DeviceMass Storage Class (except HDD) Compatible File S
12、ystemFAT 32/ 16/ 12 Playable Audio FormatMP3/ WMA/ WAV Max. CurrentDC 5 V 1 A Output Power (For KD-S48)DC 5 V 1 A , USB input terminal (front/rear) BLUETOOTH SECTION VersionBluetooth 2.1 certified (+EDR) ProfileHFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3, PBAP 1.0 GENERAL Power RequirementOperating Voltag
13、eDC 14.4 V (11 V to 16 V allowance) Grounding SystemNegative ground Allowable Operating Temperature0C to +40C (32F to 104F) Dimensions (W H D) : (approx.)Installation Size182 mm 52 mm 158 mm (7-3/16” 2-1/16” 6-1/4”) Panel Size188 mm 59 mm 9 mm (7-7/16” 2-3/8” 3/8”) Mass1.3 kg (2.9 lbs) (excluding ac
14、cessories) RadioFans.CN 收音机爱 好者资料库 (No.MA492)1-3 Subject to change without notice. KD-R721BT, KD-R727BT, KD-R729BT AUDIO AMPLIFIER SECTION Maximum Power Output50 W per channel Continuous Power Output (RMS)20 W per channel into 4 , 40 Hz to 20 000 Hz at no more than 1% total harmonic distortion. Sign
15、al-to-Noise Ratio70 dB Load Impedance4 (4 to 8 allowance) Frequency Response40 Hz to 20 000 Hz Line-Out or Subwoofer-Out Level / Impedance2.5 V/20 k load (full scale) Output Impedance 600 Other TerminalUSB input terminal, USB rear cable, Auxiliary input jack, Antenna input TUNER SECTION Frequency Ra
16、ngeFM87.5 MHz to 108.0 MHz LW For KD-R72765.0 MHz to 74.0 MHz AMMW531 kHz to 1 611 kHz LW153 kHz to 279 kHz FM TunerUsable Sensitivity9.3 dBf (0.8 V/75) 50 dB Quieting Sensitivity16.3 dBf (1.8 V/75 ) Alternate Channel Selectivity (400 kHz)65 dB Frequency Response40 Hz to 15 000 Hz Stereo Separation:
17、40 dB MW TunerSensitivity/Selectivity20 V/40 dB LW TunerSensitivity50 V CD PLAYER SECTION TypeCompact disc player Signal Detection SystemNon-contact optical pickup (semiconductor laser) Number of Channels2 channels (stereo) Frequency Response5 Hz to 20 000 Hz Signal-to-Noise Ratio102 dB Wow and Flut
18、terLess than measurable limit MP3 Decoding Format (MPEG1/2 Audio Layer 3) Max. Bit Rate: 320 kbps WMA (Windows Media(R) Audio) Decoding FormatMax. Bit Rate: 192 kbps USB SECTION USB StandardUSB 1.1, USB 2.0 Data Transfer Rate (Full Speed)Max. 12 Mbps Compatible DeviceMass Storage Class (except HDD)
19、Compatible File SystemFAT 32/ 16/ 12 Playable Audio FormatMP3/ WMA/ WAV Output PowerDC 5 V 1 A, USB input terminal (front/rear) BLUETOOTH SECTION VersionBluetooth 2.1 certified (+EDR) Power ClassClass 2 Radio Service Area10 m ProfileHFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3, PBAP 1.0 GENERAL Power Requi
20、rementOperating VoltageDC 14.4 V (11 V to 16 V allowance) Grounding SystemNegative ground Allowable Operating Temperature0C to +40C Dimensions (W H D) : (approx.)Installation Size182 mm 52 mm 158 mm Panel Size188 mm 59 mm 9 mm Mass1.3 kg (excluding accessories) RadioFans.CN 收音机爱 好者资料库 1-4 (No.MA492)
21、 Subject to change without notice. KD-R726 AUDIO AMPLIFIER SECTION Maximum Power Output50 W per channel Continuous Power Output (RMS)20 W per channel into 4 , 40 Hz to 20 000 Hz at no more than 1% total harmonic distortion. Signal-to-Noise Ratio70 dB Load Impedance4 (4 to 8 allowance) Frequency Resp
22、onse40 Hz to 20 000 Hz Line-Out or Subwoofer-Out Level / Impedance5.0 V/20 k load (full scale) Output Impedance 600 Other TerminalUSB input terminal, USB rear cable, Auxiliary input jack, Antenna input TUNER SECTION Frequency RangeFM87.5 MHz to 108.0 MHz AM531 kHz to 1 611 kHz FM TunerUsable Sensiti
23、vity9.3 dBf (0.8 V/75) 50 dB Quieting Sensitivity16.3 dBf (1.8 V/75 ) Alternate Channel Selectivity (400 kHz)65 dB Frequency Response40 Hz to 15 000 Hz Stereo Separation:40 dB AM TunerSensitivity/Selectivity20 V/40 dB CD PLAYER SECTION TypeCompact disc player Signal Detection SystemNon-contact optic
24、al pickup (semiconductor laser) Number of Channels2 channels (stereo) Frequency Response5 Hz to 20 000 Hz Signal-to-Noise Ratio98 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 FormatMax. Bit Rat
25、e: 320 kbps USB SECTION USB StandardUSB 1.1, USB 2.0 Data Transfer Rate (Full Speed)Max. 12 Mbps Compatible DeviceMass Storage Class (except HDD) Compatible File SystemFAT 32/ 16/ 12 Playable Audio FormatMP3/ WMA/ WAV Max. CurrentDC 5 V 1 A BLUETOOTH SECTION VersionBluetooth 2.1 certified (+EDR) Pro
26、fileHFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3, PBAP 1.0 GENERAL Power RequirementOperating VoltageDC 14.4 V (11 V to 16 V allowance) Grounding SystemNegative ground Allowable Operating Temperature0C to +40C Dimensions (W H D) : (approx.)Installation Size182 mm 52 mm 158 mm Panel Size188 mm 59 mm 9 mm Ma
27、ss1.3 kg (excluding accessories) (No.MA492)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 Output20 W RMS 4 Channels at 4 and 1% THD+N Signal-to-Noise Ratio80
28、 dBA (reference: 1 W into 4 ) Load Impedance4 (4 to 8 allowance) Frequency Response40 Hz to 20 000 Hz Line-Out or Subwoofer-Out Level / Impedance2.5 V/20 k load (full scale) Output Impedance 600 Other TerminalAUX (auxiliary) input jack, USB input terminal, USB rear cable, Antenna terminal TUNER SECT
29、ION Frequency RangeFMwith channel interval set to200 kHz87.9 MHz to 107.9 MHz 50 kHz87.5 MHz to 108.0 MHz AMwith channel interval set to 10 kHz530 kHz to 1 700 kHz 9 kHz531 kHz to 1 611 kHz FM TunerUsable Sensitivity9.3 dBf (0.8 V/75) 50 dB Quieting Sensitivity16.3 dBf (1.8 V/75 ) Alternate Channel
30、Selectivity (400 kHz) 65 dB Frequency Response40 Hz to 15 000 Hz Stereo Separation:40 dB AM TunerSensitivity/Selectivity20 V/40 dB CD PLAYER SECTION TypeCompact disc player Signal Detection SystemNon-contact optical pickup (semiconductor laser) Number of Channels2 channels (stereo) Frequency Respons
31、e5 Hz to 20 000 Hz Signal-to-Noise Ratio98 dB Wow and FlutterLess 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 StandardUSB 1.1, USB 2.0 Data Transfer Rate (Full Speed)Max
32、. 12 Mbps Compatible DeviceMass Storage Class (except HDD) Compatible File SystemFAT 32/ 16/ 12 Playable Audio FormatMP3/ WMA/ WAV Max. CurrentDC 5 V 1 A BLUETOOTH SECTION VersionBluetooth 2.1 certified (+EDR) Power ClassClass 2 Radio Service Area10 m (10.9 yd) ProfileHFP 1.5, OPP 1.1, A2DP 1.2, AVR
33、CP 1.3, PBAP 1.0 GENERAL Power RequirementOperating VoltageDC 14.4 V (11 V to 16 V allowance) Grounding SystemNegative ground Allowable Operating Temperature0C to +40C (32F to 104F) Dimensions (W H D) : (approx.)Installation Size182 mm 52 mm 158 mm (7-3/16” 2-1/16” 6-1/4”) Panel Size188 mm 59 mm 9 m
34、m (7-7/16” 2-3/8” 3/8”) Mass1.3 kg (2.9 lbs) (excluding accessories) 1-6 (No.MA492) SECTION 1 PRECAUTION 1.1Safety 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 ma
35、de 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
36、 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 hav
37、e 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
38、 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
39、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
40、 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 produc
41、t, 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
42、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
43、 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, 1,000 per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15F AC-type capacitor between an ex- posed metal part and a
44、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
45、 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.). 1.2Warning (1) This equipment has been designed and manufactured to meet international safety standards. (2) It is the legal responsibility of the repairer to ensure
46、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 form
47、ed 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. 1.4Critical parts for safety In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts
48、 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
49、) 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)1-7 1.5Preventing 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
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