JVC-THS77-ddcs-sm 维修电路原理图.pdf
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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB4212005/7DVD DIGITAL CINEMA SYSTEMMB42120057TH-S77Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-205TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . .
4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25PHONESMIC 2MIC 1MINMIC LEVELMAXArea suffixUS - SingaporeUP - KoreaUT - TaiwanUX - Saudi ArabiaUG - Turkey,South Africa,EgyptUN - Asean(SP-THS77F)(SP-THS77F)(SP-THS77S)(SP-PWS77)(XV-THS77)(SP-THS77C)RadioFans.CN
5、收音机爱 好者资料库1-2 (No.MB421)SPECIFICATIONCenter unit (XV-THS77)*1: This value is measured at System cord CONNECTOR for reference.*2: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz)Subwoofer (SP-PWS77)Audio section Total Harmonic Di
6、stortion *10.02%Audio input level AUDIO IN (VCR)270 mV/47 kDigital input *2DIGITAL IN (OPTICAL)-21 dBm to -15 dBm (660 nm E30 nm)Video section Video SystemPAL/NTSCHorizontal Resolution500 linesSignal-to-Noise Ratio64 dBVideo input sensitivity/Impedance (VCR IN)Composite: 1.0 V(p-p)/75 S-video-Y: 1.0
7、 V(p-p)/75 S-video-C: For PAL 0.3 V(p-p)/75 S-video-C: For NTSC 0.286 V(p-p)/75 Video output levelComposite: 1.0 V(p-p)/75 S-video-Y: 1.0 V(p-p)/75 S-video-C: For PAL 0.3 V(p-p)/75 S-video-C: For NTSC 0.286 V(p-p)/75 Component-Y: 1.0 V(p-p)/75 Component-PB/PR: 0.7 V(p-p)/75 Tuner section Tuning Rang
8、eFM87.50 MHz to 108.00 MHzAM (Except for the countries of Middle East) 531 kHz to 1 710 kHz(at 9 kHz intervals)530 kHz to 1 710 kHz(at 10 kHz intervals)AM (For the countries of Middle East)531 kHz to 1 602 kHz(at 9 kHz intervals)530 kHz to 1 600 kHz(at 10 kHz intervals)GeneralPower RequirementsAC 11
9、0 - 240 V , 50/60 HzPower Consumption17 W (at operation)1.4 W (in standby mode)Dimensions (W H D)435 mm 55 mm 304 mmMass2.5 kgAmplifier sectionFront140 W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic distortion.Center/Surround130 W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic
10、distortion.Subwoofer140 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion.Speaker sectionSpeaker unit16 cm Bass-reflexPower Handling Capacity140 WImpedance4 Frequency Range30 Hz to 200 HzGeneralPower RequirementsAC 110 V/AC 127 V/AC 220 - 240 V, 50 Hz/60 HzPower Consumption135 W (at operati
11、on)0 W (in standby mode)Dimensions (W H D)170 mm 411 mm 451 mmMass11.5 kgRadioFans.CN 收音机爱 好者资料库(No.MB421)1-3Satellite SpeakersDesigns & specifications are subject to change without notice.Front speakers(SP-THS77F)Speaker unit5.5 cm 21-way 2-speaker bass-reflex type, Magnetically ShieldedPower Handl
12、ing Capacity140 WImpedance4 Frequency Range90 Hz to 20 kHzSound Pressure Level78 dB/WmDimensions (W H D)230 mm 1 104 mm 285 mmMass3.6 kgCenter speaker (SP-THS77C)Speaker unit5.5 cm 21-way 2-speaker bass-reflex type, Magnetically ShieldedPower Handling Capacity140 WImpedance4 Frequency Range90 Hz to
13、20 kHzSound Pressure Level80 dB/WmDimensions (W H D)220 mm 84 mm 91 mmMass0.96 kgSurround speakers(SP-THS77S)Speaker unit5.5 cm 21-way 2-speaker bass-reflex typePower Handling Capacity140 WImpedance4 Frequency Range90 Hz to 20 kHzSound Pressure Level75.5 dB/WmDimensions (W H D)230 mm 1 104 mm 285 mm
14、Mass3.5 kg1-4 (No.MB421)SECTION 1PRECAUTION1.1Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, no changes should be madeto the original design unless authorized in writing by themanuf
15、acturer. Replacement parts must be identical tothose used in the original circuits. Services should be per-formed by qualified personnel only.(2) Alterations of the design or circuitry of the product shouldnot be made. Any design alterations of the product shouldnot be made. Any design alterations o
16、r additions will voidthe manufacturers warranty and will further relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom.(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. These characteris-tics are often no
17、t evident from visual inspection nor can theprotection afforded by them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age, etc. Replacement parts which have these specialsafety characteristics are identified in the Parts List of Ser-vice Manual. Electrical c
18、omponents having such featuresare identified by shading on the schematics and by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement which does not have the same safety charac-teristics as the recommended replacement parts shown inthe Parts List of Service Manual may creat
19、e shock, fire, orother hazards.(4) The leads in the products are routed and dressed with ties,clamps, tubings, barriers and the like to be separated fromlive parts, high temperature parts, moving parts and/orsharp edges for the prevention of electric shock and firehazard. When service is required, t
20、he original lead routingand dress should be observed, and it should be confirmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazard testingAfter reassembling the product, always perform an isola-tion check on the exposed metal parts of the product (an-tenna terminals
21、, knobs, metal cabinet, screw heads,headphone jack, control shafts, etc.) to be sure the productis safe to operate without danger of electrical shock.Do notuse a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using aLeakage Current Tester, measure th
22、e leakage currentfrom each exposed metal parts of the cabinet, particular-ly any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakage cur-rent must not exceed 0.5mA AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use a
23、nAC voltmeter having, 1,000 per volt or more sensitivityin the following manner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between an ex-posed metal part and a known good earth ground.Measure the AC voltage across the resistor with the ACvoltmeter. Move the resistor connect
24、ion to each exposed metalpart, particularly any exposed metal part having a returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5mA A
25、C (r.m.s.). 1.2Warning(1) This equipment has been designed and manufactured tomeet international safety standards.(2) It is the legal responsibility of the repairer to ensure thatthese safety standards are maintained.(3) Repairs must be made in accordance with the relevantsafety standards.(4) It is
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