JVC-THA30-ddcs-sm维修电路原理图.pdf

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1、SERVICE MANUAL No.21172 Dec. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. Safety precautions Preventing static electricity Important for laser products 1-2 1-3 1-4 Disassembly method Wiring connection Description of major ICs 1-5 1-12 1-1328 Contents DVD DIGITAL CINEMA SYSTEM TH-A30 TH-A30 Area

2、 suffix US - Singapore UB - Hong Kong UW - Brazil,Mexico,Peru UG - Turkey,South Africa, Egypt A - Australia D I G I T A L STANDBY AUDIO/FM MODE DSPVOLUMESOURCE DVD DIGITAL CINEMA SYSTEM TH-A30 STANDBY/ON DISPLAY TOP MENU AUDIO TUNING ENTER VCR CHANNEL TUNER PRESET DVDFM/AMAUX MUTING STANDBY/ON VCR V

3、CR CONTROL MENU TV AUDIO/ FM MODESUBTITLE RETURN STEP TV VOLUME TV CHANNEL VOLUME B.SEARCHF.SEARCH DOWNUP REWFF RM-STHA30U DVD CINEMA SYSTEM TV/VIDEO PROGRESSIVE SP-XSA30 2 XV-THA30SP-WA30 SP-XA30 3 RadioFans.CN 收音机爱 好者资料库 TH-A30 1-2 1. This design of this product contains special hardware and many

4、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 pe

5、rsonnel 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

6、 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 compon

7、ents 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

8、. 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

9、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 nor

10、mal, 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 th

11、e 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 ex

12、posed 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 ma

13、nner. 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 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 havi

14、ng 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 t

15、o 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.

16、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 chassis. Th

17、erefore, pay attention to such burrs in the case of preforming repair of this system. 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

18、 the mark nearby are critical for safety. (This regulation does not correspond to J and C version.) RadioFans.CN 收音机爱 好者资料库 1-3 TH-A30 Preventing static electricity 1.Grounding to prevent damage by static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the b

19、ody, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 2.About the earth processing for the destruction prevention by static electricity Static electricity in the work area can destroy the optical pickup

20、(laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbench Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical p

21、ickup) on it. 2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 3. Handling the optical pickup 1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are short

22、ed. After replacement, return the shorted parts to their original condition. (Refer to the text.) 2. Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power source can easily destroy the laser diode. 4.Handling the traverse unit (optical pickup

23、) 1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. 2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti

24、-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not

25、 turn it. Attention when traverse unit is decomposed *Please refer to Disassembly method in the text for pick-up and how to detach the substrate. (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate Solder is put up before the card wire is removed from connector on

26、the pick up board as shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.) Please remove solder after connecting the card wire with when you install picking up in the substrate. 1. 2. DVD loading mechanism DVD loader board Pick up board Card wi

27、re Short land Connector DVD mechanism assembly (bottom side)(These two points are soldered respectively, and are made to short-circuit) TH-A30 1-4 Important for laser products 1.CLASS 1 LASER PRODUCT 2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct expos

28、ure to beam. 3.CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions. 4.CAUTION : The compact disc player uses invisible laser radiation and is equipped with safety switches which prevent emission of radi

29、ation when the drawer is open and the safety interlocks have failed or are de feated. It is dangerous to defeat the safety switches. 5.CAUTION : If safety switches malfunction, the laser is able to function. 6.CAUTION : Use of controls, adjustments or performance of procedures other than those speci

30、fied herein may result in hazardous radiation exposure. REPRODUCTION AND POSITION OF LABELS CLASS 1 LASER PRODUCT ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. 1-5 TH-A30 Remove the four screws A attaching the top cover on both side

31、s of the body. Remove the three screws B on back of the body. Remove the top cover from behind in the direction of the arrow while pulling both sides outward. 1. 2. 3. Disassembly method Removing the top cover (See Fig.1) Prior to performing the following procedure, remove the top cover. Remove the

32、three screws C attaching the front panel assembly on bottom of the body. Remove the two screws D attaching the front panel assembly on both sides of the body. Remove the claw1, claw2 and claw3, and detach the front panel assembly toward the front. Disconnect the card wire from the connector FCW1 and

33、 FCW2 on the display board. 1. 2. 3. 4. Removing the front panel assembly (See Fig.2A, 2B and 3) Prior to performing the following procedure, remove the top cover. Cut off the tie band fixing the power cord. Disconnect the power cord from the connector ACW1 on the main board and pull up the cord sto

34、pper upward. Notes : The power cord is exchangeable. 1. 2. Removing the power cord (See Fig.4) D (both sides) Claw2 (both sides) Fig.1 Fig.2A Fig.2B Fig.3 Fig.4 A(both sides) B Top cover CC Claw1 Power cord stopper Power cord Front panel assembly (bottom side) Front panel assembly Front panel assemb

35、ly (Inner side) Rear panel Claw3 Display board FCW1FCW2 ACW1 Tie band TH-A30 1-6 Prior to performing the following procedure, remove the top cover and power cord stopper. Disconnect the harness from the connector J9 on the DSP board. Remove the two screws F, four screws G, one screw I and five screw

36、s J attaching the each board to the rear panel. Remove the three screws K attaching the rear panel on back of the body. 1. 2. 3. Removing the rear panel (See Fig.7 and 8) Removing the tuner pack (See Fig.7 and 8) Prior to performing the following procedure, remove the top cover. Disconnect the card

37、wire from the connector CON01 on the tuner pack. Remove the two screws F attaching the tuner pack to the rear panel. 1. 2. Removing the fan motor (See Fig.7 and 8) Prior to performing the following procedures, remove the top cover . Disconnect the harness from the connector J9 on the DSP board . Rem

38、oving the two screws H attaching the fan motor to the rear panel. 1. 2. Prior to performing the following procedure, remove the top cover. Disconnect the card wire from the connector VW2 on the jack board. Disconnect the harness from the connector J10 on the DSP board. Remove the four screws G attac

39、hing the jack board to the rear panel. 1. 2. 3. Removing the jack board (See Fig.7 and 8) Removing the DVD mechanism assembly (See Fig.5 and 6) Prior to performing the following procedure, remove the top cover. Disconnect the card wire from the connector J14 and J21 on the DVD MPEG board. Remove the

40、 two screws E attaching the DVD mechanism assembly and pull up with drawing out. Disconnect the harness from the connector DJ6 on the DVD loader board. 1. 2. 3. FJ KKK GHI DJ6 Fig.5 Fig.6 Fig.8 Fig.7 DVD mechanism assembly Tuner pack Jack board DSP board Fan motor J9(on the DSP board) J10 (on the DS

41、P board) VW2 CON01 Rear panel E Rear panel Rear panel DVD mechanism assembly J14 J21 DVD MPEG board DVD loader board 1-7 TH-A30 Prior to performing the following procedure, remove the top cover, front panel assembly, power cord, DVD mechanism assembly, jack board and DSP board. Disconnect the card w

42、ire from the connector CW8 on the main board. Disconnect the harness from the connector ACW2, ACW3, ACW4 and ACW5 on the main board. Remove the five screws J attaching the speaker terminals and jack to the rear panel (see fig.7). Remove the nine screws M2 attaching the main board. When the rear pane

43、l is not removed, pull up the main board from front side. 1. 2. 3. 4. 5. Prior to performing the following procedure, remove the top cover, front panel assembly, DVD mechanism assembly, jack board, DSP board and main board. After removing the solder part 1 soldered to the main board, remove each scr

44、ew and remove the heat sink from the power transistor. After removing the solder part 2 soldered to the main board, remove each screw and remove the heat sink from the power IC. 1. 2. Removing the main board (See Fig.10) Prior to performing the following procedure, remove the top cover, front panel

45、assembly, DVD mechanism assembly and jack board. Remove the harness band fixing the harness. Disconnect the harness from the connector J9 and J10 on the DSP board. Disconnect the card wire from the connector J1 and J3 on the DSP board. Remove the one screw L attaching the DSP board. Remove the screw

46、 M1 and remove the earth wire. Remove the one screw I attaching the DSP board to the rear panel (see fig.7). Pull up the DSP board from the front side upwards disconnecting the connector J2, J5, J6 and J7. 1. 2. 3. 4. 5. 6. 7. Removing the DSP board (See Fig.9) Removing the power transistor lay cont

47、roller segment/timing withinternal pull-down resistor in common Internal pull-down resistor output Power pin (+) Output for VFD display controller High voltage input port PC0 to PC3 Power pin (+) for the VFD output pull-down resist Output for VFD display controller High voltage input port PC4 to PC7

48、, PD0 to PD7 Output for VFD displaya controller segment High voltage input port PE0 to PE7 Power pin (+) Output for VFD displaya controller segment High voltage input port PF0 to PF7 Output for VFD displaya controller segment High voltage I/O port PG0 to PG3 8-bit input/output port. Input for port0

49、interrupt. Input/output in nibble unit Input for HOLD release 15V withstand at N-channel open drain output Power pin (-) Power pin (+) 8-bit input/output port. Input for port0 interrupt. Input/output in nibble unit Input for HOLD release 15V withstand at N-channel open drain output SIO0 data output SIO0 data input/bus input/output SIO0 clock input/output SIO1 data output SIO1 data input/bus input/output SIO1 clock input/output 8-bi