Jvc-THM-55-Service-Manual电路原理图.pdf
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1、SERVICE MANUALCOPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB0752003/11DVD DIGITAL THEATER SYSTEMMB075200310TH-M55TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 S
2、PECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84
3、 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-345 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、. . . 1-39Area suffixJ - U.S.A.C - CanadaXV-THM55 SP-PWM55SP-THM55C SP-THM55F SP-THM55F SP-THM55F SP-THM55F1-2 (No.MB075)SPECIFICATIONDesign and specifications are subject to change without notice.Center unitAudio sectionTotal Harmonic Distortion 0.02%NOTE : This value is measured at System cord CON
5、NECTOR for reference.Audio input sensitivity/Impedance (at 1 kHz)Analog input AUDIO IN (VCR) 290 mV/47 kDigital input* DIGITAL IN (DBS) (OPTICAL) -21 dBm to -15 dBm (660 nm 30 nm)* Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kH
6、z)Video sectionColor System NTSCHorizontal Resolution 500 linesSignal-to-Noise Ratio 64 dBVideo output level Composite 1.0 V(p-p)/75 S-video-Y 1.0 V(p-p)/75 S-video-C 0.286 V(p-p)/75 Component-Y 1.0 V(p-p)/75 Component-PB/PR 0.7 V(p-p)/75 Video input sensitivity/Impedance (VCR IN)Composite 1.0 V(p-p
7、)/75 S-video-Y 1.0 V(p-p)/75 S-video-C 0.286 V(p-p)/75 Tuner sectionTuning Range FM 87.5 MHz to 108.0 MHzAM 530 kHz to 1710 kHzGeneralPower Requirements AC 120 V, 60 HzPower Consumption 20 W (at operation), 1.0 W (in standby mode)Dimensions (W H D) 400 mm 85 mm 386 mm (15-3/4 inches 3-3/8 inches 15-
8、1/14 inches)Mass 4.6 kg (10.2 lbs)SubwooferAmplifier sectionFront/Center/Surround 100 W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic distortion.Subwoofer 120 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion.Speaker sectionSpeaker unit 16 cm (6-5/16 inches) Bass-reflex, Magnetic
9、ally ShieldedFrequency Range 30 Hz to 200 HzGeneralPower Requirements AC 120 V, 60 HzPower Consumption 150 W (at operation), 0 W (in standby mode)Dimensions (W H D) 216 mm 353 mm 485 mm (8-9/16 inches 13-15/16 inches 19-1/8 inches)Mass 12.0 kg (26.5 lbs)Satellite SpeakerSpeakers Woofer 10.0 cm (3-15
10、/16 inches)Tweeter 4.0 cm (1-5/8 inches) Bass-reflex, Magnetically ShieldedPower Handling Capacity 100 WImpedance 4 Frequency Range 65 Hz to 20 kHzDimensions (W H D) 140 mm 228 mm 167 mm (5-9/16 inches 9 inches 6-5/8 inches)Mass 1.9 kg (4.2 lbs)Center SpeakerSpeakers Woofer 8.0 cm (3-3/16 inches) 2T
11、weeter 4.0 cm (1-5/8 inches) Bass-reflex, Magnetically ShieldedPower Handling Capacity 100 WImpedance 4 Frequency Range 65 Hz to 20 kHzDimensions (W H D) 326 mm 119 mm 164 mm (12-7/8 inches 4-11/16 inches 6-1/2 inches)Mass 2.4 kg (5.3 lbs)AccessoriesRemote control (1), Batteries (2), FM antenna (1),
12、 AM loop antenna (1), Power cord (1), System cord (1), Composite video cord (1)Speaker codes (1)5 m (16 ft) For satellite (front left/right) and center speakers (3)10 m (32 ft) For satellite speakers (surround left/right) (2) (The length of the above speaker cords are approximate.)(No.MB075)1-3SECTI
13、ON 1PRECAUTION1.1 Safety 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 themanufacturer. Replacement parts m
14、ust 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 or additions will voidthe man
15、ufacturers 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 not evident from visual inspec
16、tion 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 components having such featur
17、esare 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 create shock, fire, orother hazar
18、ds.(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, the original lead routingand
19、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, knobs, metal cabinet, scre
20、w 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 a“Leakage Current Tester“, measure the leakage currentfrom each
21、 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 anAC voltmeter having, 1,00
22、0 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 connection to each exposed metalp
23、art, 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 AC (r.m.s.). 1.2 Warning(1)
24、 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 essential that safety cri
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