Jvc XMPX 70 WT Service Manual
This is the 38 pages manual for Jvc XMPX 70 WT Service Manual.
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Extracted text from Jvc XMPX 70 WT Service Manual (Ocr-read)
Page 1
XM-PX70WT/BU/PN 1-2 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 manufacturer`s 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 re-assembling. 5. Leakage currnet check (Electrical shock hazard testing) After re-assembling 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, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an e xposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre 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. 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. 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 ! Burrs formed during molding may be left over on some parts of the chassi\ s. Therefore, pay attention to such burrs in the case of preforming repair of this sys\ tem.
Page 2
XM-PX70WT/BU/PN 1-3 The laser diode in the traverse unit (optical pick up) is easy to be destroyed by clothes and the human body to the electrified static electricity. Please note the explosion by static electricity when repairing.In the equipment which uses an optical pick up (laser diode), an optical pick up is destroyed by the static electricity of the work environment. Please do the earth processing and work. 2. About the earth processing for the electrostatic destruction prevention 1) Earth of work stand Please pull the conductive material (conductive sheet) or the iron plate to the depository place of the traverse unit (optical pick up), and take the earth to ground. 2) Human body earth Please use the anti-static wrist strap to exhaust the electrified static electricity to the human body. 3. Handling the optical pick up 1) Please return according to a correct procedure based on short processing after exchanging parts. 2) Do not use a tester to check the condition of the laser diode in the optical pick up .The tester 's internal power source can easily destroy the laser diode. 4. Attention when unit is disassembled Please refer to "Disassembling method" for how to detach . Conductive material (conductive sheet) or the iron plate anti-static wrist strap Attention when MD pickup is exchanged 1. About the static electricity protection measures Solder short 1) Please be sure to solder before a flexible wire is removed from connector on a main printed circuit board as shown. if you removes without soldering.the MD picking up assembly might destroy 2) When installing , solder in the part of short round should be removed after a flexible wire is connected with connector.
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XM-PX70WT/BU/PN 1-18 E-17 E-16 E-15 D-17 D-16 D-15 A-17 B-17 C-17 A-16 B-16 C-16 A-15 B-15 C-15 A-14 B-14 C-14 A-13 B-13 C-13 A-12 B-12 C-12 A-11 B-11 C-11 A-10 B-10 C-10 A-9 B-9 C-9 A-8 B-8 C-8 A-7 B-7 C-7 A-6 B-6 C-6 A-5 B-5 C-5 A-4 B-4 C-4 VSIO2 F0CN VDIO2 DTRF CKRF XLRF NC NC LDDR NC NC APCR TFDR TRDR NC FRDR FFDR VDC4 VSC4 SRDR FS4 SPFD SPRD SFRD TEST2 TEST1 FGIN TST2 EFMO TEST3 VSIO3 TST3 VDIO3 SPCU SPDW SPDVTST4 SPCW SPCVVSC5 SLDW SLDV SLCV SLCU VDC5 BYPS TST5 SLCW - O - O O O - - O - - O O O - O O - - O O O O O I I I O O I - O -I O O O I I - O O I I - O O I/O 2.5V I/O Vss Filter cutoff control output 2.5V I/O VDD Controller data output Controller clock output Controller latch output Open Open Laser digital APC PWM output Open Open Laser APC reference PWM output Tracking servo drive PWM output (+) Tracking servo drive PWM output (-) Open Focus servo drive PWM output (-) Focus servo drive PWM output (+) Internal logic VDD (1.8V) Internal logic GND Sled servo drive PWM output (-) 176.4kHz clock output (X'tal system) Spindle servo drive output Spindle servo drive output Sled servo drive PWM output (+) Test terminal Connect to GND Test terminal Connect to GND Spindle CAV servo FG input Test terminal Open EFM output at recording Test terminal Connect to GND 2.5V I/O Vss Test terminal Open 2.5V I/O VDD Blush less spindle motor drive comparate input (U) Blush less spindle motor 3 phase drive truth output (W) Blush less spindle motor 3 phase drive truth output (V) Test terminal Open Blush less spindle motor drive comparete input (W) Blush less spindle motor drive comparate input (V) Internal logic GND Blush less sled motor 3 phase drive truth output (W) Blush less sled motor 3 phase drive truth output (V) Blush less sled motor 3 phase drive comparate input (V) Blush less sled motor 3 phase drive comparate input (U) Internal logic VDD (1.8V) Open Test terminal Open Blush less sled motor 3 phase drive comparate input 2.Pin function (4) Pin No. Symbol I/O Function