Jvc-XMPX-70-WT-Service-Manual电路原理图.pdf
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1、SERVICE MANUALPORTABLE MINIDISC PLAYERNo.20897Jan. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.XM-PX70WT/BU/PNXM-PX70WT/BU/PNArea Suffix UB Hong KongContentsSafety PrecautionsAttention whenMD pick up is exchangedDisassembly methodAdjustment methodMaintenance of laser pickupReplacement of laser p
2、ickupDescription of major ICsAttention when partsare exchanged1-21-31-41-91-101-101-111-24XM-PX70WT/BU/PN1-21. 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 des
3、ign 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 produc
4、t 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 cha
5、racteristics. 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
6、 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 s
7、hown 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 elect
8、ric 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 perfor
9、m 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
10、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 (
11、r.m.s.)Alternate check methodPlug 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 exposed metal part and a known good earth grou
12、nd.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
13、 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 maint
14、ained.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 groundPlace this probe on each exposedmetal part.AC VO
15、LTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.XM-PX70WT/BU/PN1-3The laser diode in the traverse unit (optical
16、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 envi
17、ronment. Please do the earth processing and work.2. About the earth processing for the electrostatic destruction prevention1) Earth of work standPlease 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
18、 to ground.2) Human body earthPlease use the anti-static wrist strap to exhaust the electrified static electricity to the human body.3. Handling the optical pick up1) Please return according to a correct procedure based on short processing after exchangingparts. 2) Do not use a tester to check the c
19、ondition of the laser diode in the optical pick up .The tester s internalpower source can easily destroy the laser diode. 4. Attention when unit is disassembledPlease refer to “Disassembling method“ for how to detach .Conductive material (conductive sheet) or the iron plateanti-static wrist strapAtt
20、ention when MD pickup is exchanged1. About the static electricity protection measuresSolder short1) 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 destroy2) When ins
21、talling , solder in the part of short round should be removed after a flexible wire is connected with connector.XM-PX70WT/BU/PN1-4Shift the door lever to open the door.Remove the four screws A and detach the MD door assembly from the main body.1.2.Disassembly methodRemoving the MD door assembly (See
22、 Fig.1 and 2)Prior to performing the following procedure, remove the MD door assembly.Turn the holder assembly as shown in Fig.3.Pull the side arm (L) marked a and remove outward. Open the holder assembly as shown in Fig.4. Move the marked b in the direction of the arrow and release it from the shaf
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