Jvc XVN 44 SL Service Manual

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XV-N40BK,XV-N44SL 1-2 (No.A0040) SPECIFICATION General Other Video outputs Audio outputs Audio characteristics - Specifications and appearance are subject to change without prior notice. - Manufactured under license from Dolby Laboratories. "Dolby" and the double-D symbol are trademarkes of Dolby Laboratories. - Manufactured under license from Digital Theater Systems, Inc. "DTS" and "DTS Digital Surround" are registered trademarks of Dig- ital Theater Systems, Inc. Digital output signal chartReadable discs DVD VIDEO, DVD-R (Video format), DVDRW (Video format), +RW (Video format), SVCD, Video CD, Audio CD (CD-DA), MP3 format, JPEG, CD-R/RW (CD-DA, SVCD, Video CD, MP3 format, JPEG) Video format NTSC, 480i (Interlaced scan)/480p (Progressive scan) selectable Power requirements AC 120 V, 60 Hz Power consumption 10.4 W (POWER ON) 0.7 W (STANDBY mode) Mass 2.1 kg (4.7 lbs) Dimensions (W x H x D) 435mm x 53mm x 248.4mm (17-3/16 inch x 2-1/8 inc x 9-13/16 inch) COMPONENT (pin jacks) Y Output: 1.0 Vp-p (75 ohm) Pb/Pr Output: 0.7Vp-p (75 ohm) VIDEO OUT (pin jack) 1.0 Vp-p (75 ohm) S-VIDEO OUT (S jack) Y Output: 1.0 Vp-p (75 ohm) C Output: 286 mVp-p (75 ohm) Horizontal resolution 500 lines or more ANALOG OUT (pin jack) 2.0 Vrms (10 kohm) DIGITAL OUT (COAXIAL) 0.5 Vp-p (75 ohm termination) DIGITAL OUT (OPTICAL) -21 dBm to -15 dBm (peak) Frequency response CD (sampling frequency 44.1 kHz):2 Hz to 20 kHz DVD (sampling frequency 48 kHz):2 Hz to 22 kHz (4 Hz to 20 kHz for DTS and Dolby Digital bitstream signals) DVD (sampling frequency 96 kHz):2 Hz to 44 kHz Dynamic range 16 bit: More than 98 dB 20 bit: More than 100 dB 24 bit: More than 100 dB Wow and flutter Unmeasurable (less than + 0.002%) Total harmonic distortion less than 0.006% Disc type Output PCM ONLY DOLBY DIGITAL/PCM STREAM/PCM DVD with 48/44.1 kHz, 16/20/24 bit linear PCM48/44.1 kHz, 16 bit, stereo linear PCM DVD with 96 kHz, 16/22/24 bit linear PCM48kHz, 16 bit, stereo linear PCM (Down sampling) DVD with DTS No output DTS bitstream DVD with Dolby Digital 48 kHz, 16 bit, stereo linear PCM Dolby Digital bitstream DVD with MPEG Multichannel48 kHz, 16 bit, stereo linear PCM MPEG bitstream SVCD/Video CD/Audio CD 44.1 kHz, 16 bit, stereo linear PCM Audio CD with DTS No output DTS bitstream CD-R/RW with MP3 Linear PCM

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XV-N40BK,XV-N44SL (No.A0040)1-3 SECTION 1 Important Safety Precautions 1.1 Safety 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 man- ufacturer. 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 Service Manu- al. Electrical components having such features are iden- tified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute re- placement which does not have the same safety character- istics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or oth- er 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, 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, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 ohm 10W resistor paralleled by a 0.15 µF AC-type capacitor between anexposed 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. (Except the JC version)

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XV-N40BK,XV-N44SL (No.A0040)1-11 2.2.2 Removing the traverse mechanism assembly (See Figure 7) Reverse the loading mechanism assembly. Remove the four screws B attaching the traverse mechanism assembly. Remove the traverse mechanism assembly upward. Fig.7 2.2.3 Removing the elevator (See Figure 8 and Figure 9) - Prior to the following procedure, remove the traverse mecha- nism assembly. (1) Remove the two arms of the elevator from the two parts f by moving the arms in a direction of the arrow. (2) Pull out the elevator in a rear direction. Attaching the elevator: Engage the two holes g to the two shafts on the front part of the elevator. And then, attach the elevator. Fig.8 Fig.9 Loading mechanism assembly B B B B Traverse mechanism assembly Part f Part f Elevator Slide cam ShaftShaftShaft Elevator g g

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XV-N40BK,XV-N44SL (No.A0040)1-15 3.4 All-initialization method Please perform all-initialization according to the following procedures in the following case: - Just after you exchange the pick-up. - Just after you exchange the spindle motor. - Just after you exchange the traverse mechanism base. NOTE: Please perform all-initialization when you exchange the parts above and also when you remove the parts above. - Just after the flap adjustment of the pick-up guide shaft (1) Set the main body at test mode. (2) Press and hold "BACKWARD SKIP" key of the main body for more than 2 seconds. (3) When all-initialization is completed, the FL display changes from " 0" to " 33". NOTE: After all-initialization, be sure to perform optimization adjustment of Front End parameter. 3.5 Optimization adjustment of Front End parameter Adjustment to optimize Front End parameter must be performed in each mechanism assembly of this model for high-speed starting. Please perform optimization according to the following procedures just after all-initialization is completed and when FL display shows anything except " 0" (For example when FL display shows " 1", " 2", and " 3") at test mode. (1) Press "POWER" key of the main body to turn the main body on (not to set the main body at test mode). (2) Insert the test disc VT-501 or commercial dual-layer DVD software. (3) Remove the disc when the FL display changes from "READ" to disc information. (4) Perform the same procedures as in (2) and (3) above by using the test disc CTS-1000 or commercial CD-DA software. (5) Set the main body at test mode, and check that the FL display shows " 0". NOTE: Status of this adjustment can be judged by the number displayed at test mode as follows: NOTE: As for a disc used for adjustment, - Disc should be mounted. ("Mounting" means to display "READ" after the disc is inserted and then display the disc informa- tion.) Disc need not be played. - If you do not have test disc either VT-501 (DVD) or CTS-1000 (CD-DA), use a commercial disc (for DVD, dual-layer soft- ware) after seeing and checking that the disc is neither curved nor foreseen that it may shake at the time of playback. If you use a disc with bad features, starting time may be slow or disc may not be read.DVD adjustment CD adjustment FL display at test mode Adjusted Adjusted 0 Not adjusted Adjusted 1 Adjusted Not adjusted 2 Not adjusted Not adjusted 3 2 5 8 1 4 73 6 9 0 10 +10 CANCEL TITLE/ GROUP RETURN VFPPROGRESSIVE SCAN REPEAT ZOOM DIMMER AU DIO 3D PHONICSUB TITLEANGLE OPEN/ CLOSE DISPLAY NEXT PREVIOUS SELECT CLEAR SLOW - SLOW+ TOPMENU MENU ONSCREEN CHOICEENTER STANDBY/ON POWER key STOP key (for test mode)PLAY key (for test mode) BACKWARD SKIP key (for All initialize : It pushes 2 seconds or more.) FL Display