Jvc-KDG-179-UR-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2006 Victor Company of Japan, Limited No.MA260 2006/4 CD RECEIVER MA26020064 KD-G179UR Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade) TABLE OF CONTENTS 1PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11 RadioFans.CN 收音机爱 好者资料库 1-2 (No.MA260) SPECIFICATION Design and specifications are subject to change without notice. AUDIO AMPLIFIER SECTION Power Output17 W RMS 4 Channels at 4 and or = 1% THD+N Signal to Nois

5、e Ratio80 dBA (reference: 1 W into 4 ) Load Impedance4 (4 to 8 allowance) Tone Control RangeBass10 dB at 100 Hz Treble10 dB at 10 kHz Frequency Response40 Hz to 20 000 Hz Line-Out Level/Impedance2.0 V/20 k load (full scale) Output Impedance1 k Subwoofer-Out Level/Impedance2.0 V/20 k load (full scale

6、) TUNER SECTION Frequency RangeFM87.5 MHz to 107.9 MHz (with channel interval set to 100 kHz or 200 kHz) 87.5 MHz to 108.0 MHz (with channel interval set to 50 kHz) AM530 kHz to 1 710 kHz (with channel interval set to 10 kHz) 531 kHz to 1 602 kHz (with channel interval set to 9 kHz) FM TunerUsable S

7、ensitivity11.3 dBf (1.0 V/75 ) 50 dB Quieting Sensitivity16.3 dBf (1.8 V/75 ) Alternate Channel Selectivity (400 kHz) 65 dB Frequency Response40 Hz to 15 000 Hz Stereo Separation35 dB Capture Ratio1.5 dB AM TunerSensitivity20 V Selectivity35 dB CD PLAYER SECTION TypeCompact disc player Signal Detect

8、ion SystemNon-contact optical pickup (semiconductor laser) Number of channels2 channels (stereo) Frequency Response5 Hz to 20 000 Hz Dynamic Range96 dB Signal-to-Noise Ratio98 dB Wow and FlutterLess than measurable limit GENERAL Power RequirementOperating VoltageDC 14.4 V (11 V to 16 V allowance) Gr

9、ounding SystemNegative ground Allowable Operating Temperature0C to +40C (32F to 104F) Dimensions (W H D) Installation Size (approx.)182 mm 52 mm 150 mm (7-3/16 2-1/16 5-15/16) Panel Size (approx.)188 mm 58 mm 11 mm (7-7/16 2-5/16 7/16) Mass (approx.)1.2 kg (2.6 lbs) (excluding accessories) RadioFans

10、.CN 收音机爱 好者资料库 (No.MA260)1-3 SECTION 1 PRECAUTIONS 1.1Safety Precautions ! 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. ! Please use enough caution not to see the beam directly or to

11、uch it in case of an adjustment or operation check. RadioFans.CN 收音机爱 好者资料库 1-4 (No.MA260) 1.2Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pi

12、ckup). Take care to prevent this when performing repairs. 1.2.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being per

13、formed. (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 pickup) on it. (2) Ground yourself Use an anti-static wrist strap to release any static electricity built up in your bod

14、y. (3) Handling the optical pickup In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) Do not use a tester to

15、check the condition of the laser diode in the optical pickup. The testers internal power source can easily destroy the laser diode. 1.3Handling the traverse unit (optical pickup) (1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. (2) Cut off t

16、he 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-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector.

17、(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 turn it. 1.4Attention when traverse unit is decomposed *Please refer to Disassembly method in the text for the CD pick

18、up unit. Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit. (If the flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short la

19、nd after connecting the flexible wire. 1M (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate Wires Push switch Pickup Base board Pickup Connector Flexible wire Frame CD mechanism assembly (No.MA260)1-5 1.5Important for laser products 1.CLASS 1 LASER PRODUCT 2.DANG

20、ER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure 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 CD,MD and DVD player use

21、s invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. It is dangerous to defeat the safety switches. 5.CAUTION : If safety switches malfunction, the laser is able to function

22、. 6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified here in may result in hazardous radiation exposure. REPRODUCTION AND POSITION OF LABELS ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

23、 WARNING LABEL CAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e) VARNING : Synlig och osynling laserstrlning nr den ppnas och sprren r urkopplad. Betrakta ej strlen. (s) VARO : Avattaessa ja suojalukitus ohitettuna tai vial

24、lisena olet alttiina nkyvlle ja nkymttmlle lasersteilylle. Vlt steen kohdistumista suoraan itseesi. (f) ADVARSEL : Synlig og usynlig laserstrling nr maskinen er ben eller interlocken fejeler. Undg direkte eksponering til strling. (d) CLASS 1 LASER PRODUCT 1-6 (No.MA260) SECTION 2 SPECIFIC SERVICE IN

25、STRUCTIONS 2.1CD mechanism For the CD mechanism, please refer mechanism manual TN2007-1001 (No. MY003). (No.MA260)1-7 SECTION 3 DISASSEMBLY 3.1Main body section 3.1.1Removing the front panel assembly (See Fig.1) (1) Push the detach button in the lower right part of the front panel assembly and remov

26、e the front panel assembly. Fig.1 3.1.2Removing the bottom cover (See Fig.2) (1) Turn the main body up side down. (2) Insert a screwdriver under the joints to release the two joints a on the left side, two joints b on the right side and joint c on the back side of the main body, then remove the bott

27、om cover from the main body. Note: When releasing the joints using a screwdriver, do not damage the main board. Fig.2 3.1.3Removing the front chassis assembly (See Fig.3) Remove the front panel assembly and bottom cover. (1) Remove the two screws A on the both sides of the main body. (2) Release the

28、 two joints d and two joints e on the both sides of the main body, then remove the front chassis assembly toward the front. Fig.3 Detach button Front panel assembly Bottom cover Joint b Joint b Joint c Joint a Joint a Joint d Front chassis assembly A Joint e Joint dJoint e 1-8 (No.MA260) 3.1.4Removi

29、ng the side panel (See Fig.4) Reference: Remove the front panel assembly as required. (1) Remove the screw B and two screws C attaching the side panel on the left side of the main body. (2) Remove the side panel from the main body. Fig.4 3.1.5Removing the rear bracket (See Fig.5) Remove the bottom c

30、over. (1) Remove the three screws D, three screws E and two screws F attaching the rear bracket on the back side of the main body. (2) Remove the rear bracket. 3.1.6Removing the main board (See Figs.5 and 6) Remove the front panel assembly, bottom cover and side pan- el. Reference: Remove the front

31、chassis assembly as required. (1) Remove the three screws D attaching the rear bracket on the back side of the main body. (See Fig.5.) (2) Remove the two screws G attaching the main board. (See Fig.6.) (3) Disconnect the connector CN501 on the main board from the main body and take out the main boar

32、d with the rear bracket. (See Fig.6.) Reference: Remove the rear bracket from the main body as required. (See 3.1.5 Removing the rear bracket.) Fig.5 Fig.6 Side panel CBC EF DD E Rear bracket F Main board G G CN501 Rear bracket (No.MA260)1-9 3.1.7Removing the CD mechanism assembly (See Fig. 7) Remov

33、e the front panel assembly, bottom cover, side panel, rear bracket and main board. Reference: Remove the front chassis assembly as required. (1) Remove the three screws H attaching the CD mechanism assembly on the top chassis. (2) Take out the CD mechanism assembly. Fig.7 3.1.8Removing the switch bo

34、ard (See Figs.8 to 10) Remove the front panel assembly. (1) Remove the four screws J on the back side of the front pan- el assembly. (See Fig.8.) (2) Release the joints f and remove the rear cover. (See Fig.9.) (3) Release the joint g and take out the switch board from the front panel assembly. (See

35、 Fig.10.) Fig.8 Fig.9 Fig.10 H H CD mechanism assembly Top chassis J JJ Joints f Joints f Joints fJoints f Rear cover Switch board Joint g Front panel assembly 1-10 (No.MA260) SECTION 4 ADJUSTMENT 4.1Adjustment method ? ? Test instruments required for adjustment (1) Digital oscilloscope (100MHz) (2)

36、 Electric voltmeter (3) Digital tester (4) Tracking offset meter (5) Test Disc JVC :CTS-1000 (6) Extension cable for check EXTSH002-22P 1 ? ? Standard volume position Balance and Bass &Treble volume : lndication0 Loudness : OFF ? ? Standard measuring conditions ? ? Dummy load Exclusive dummy load sh

37、ould be used for AM,and FM. For FM dummy load,there is a loss of 6dB between SSG output and antenna input.The loss of 6dB need not be considered since direct reading of figures are applied in this working standard. ? ? How to connect the extension cable for adjusting Caution: Be sure to attach the h

38、eat sink and rear bracket onto the power amplifier IC and regulator IC respectively, before supply the power. If voltage is applied without attaching these parts, the power amplifier IC and regulator IC will be destroyed by heat. Power supply voltageDC14.4V(10.5 to 16V) Load impedance20K(2 Speakers

39、connection) Output LevelLine out 2.0V (Vol. MAX) CAUTION : Be sure to attach the heat sink and rear bracket onto the power amplifier and regulator respectively, before supply the power. If voltage is applied without attaching those parts, the power amplifier IC and regulator IC will be destroyed by

40、heat. Heat sink Rear bracket EXTSH002-22P Extension cable (No.MA260)1-11 SECTION 5 TROUBLESHOOTING 5.1Feed section 5.2Focus section 5.3Spindle section Check the feed motor. Is 4V present at both sides of the feed motor? YES NO Is the voltage output at pin 4 and pin 5 of IC541? Is the power supply pr

41、esent at pin 3, pin 12 and pin 21 of IC541? Check the connections between the feed motor and IC541. YES NO Is the voltage input at pin 28 of IC541? YESYES Check IC541. NO Check the connections of CD8V power supply. NO Is the voltage output at pin 21 and pin 22 of IC561? Check the connections between

42、 IC541 and IC561. YES NO Is the power supply present at pin 4, pin 50, pin 60 and pin 72 of IC561? YES Check IC561. NO Check the connections of CD8V power supply. When the lens is moving: Does the S-search waveform appear at IC541 pins 8 and 9? 4VCheck the pickup and its connections. YES NO Is the v

43、oltage input at pin 15 of IC541? YES NO Is the voltage output at pin 28 of IC561? NO YES Check the connections between IC541 and IC561. Is the power supply present at pin 4, pin 50, pin 60 and pin 72 of IC561? YES Check IC561. NO Check the connections of CD8V power supply. Is the power supply presen

44、t at pin 3, pin 12 and pin 21 of IC541? YES Check IC541. NO Check the connections of CD8V power supply. 1-12 (No.MA260) 5.4Tracking section 5.5Signal processing section Is the disk rotated? NO YES Is the voltage output at pin 6 and pin 7 of IC541? Does the RF signal appear at RF TP? YES Check the sp

45、indle motor and its wiring. Is the RF waveform at TP RF distorted? Proceed to the Tracking section Check the circuits in the vicinity of IC501 or the pickup. YES NONO YES NO Is the voltage input at pin 17 of IC541? YES NO Is the voltage output at pin 24 and pin 25 of IC561? Check the connections bet

46、ween IC541 and IC561. YES NO Is the power supply present at pin 3, pin 12 and pin 21 of IC541? YES Check IC541. NO Check the connections of CD8V power supply. Is the power supply present at pin 4, pin 50, pin 60 and pin 72 of IC561? YES Check IC561. NO Check the connections of CD8V power supply. Whe

47、n the disc is rotated at first: Approx. 1.2V Is the tracking error signal output at TE TP? Check the circuits in IC501 or the vicinity of IC501. Replace IC501 or repair the malfunction connection point YES Check IC561. NO Check the pickup and its connections. YES NO (No.MA260)1-13 No sound from eith

48、er channel. Is 9V present at pin 26 of IC301? Compare the L-ch and R-ch to locate the defective point. Is the sound output from both channels (L, R)? YES NOIs the audio signal (including sampling output components) output to pins 1 and 7 of IC151 during playback? Is the audio signal output at pin 22

49、 and pin 25 of IC301 during playback? Normal YES NO YESYES NO Check IC151 and its peripheral circuits. NO Check IC301 and its peripheral circuits. YES Check the power amplifier IC321. NO Is 9V present at pin 10 of IC901? YES Check the connections between pin 26 of IC301 and pin 10 of IC901. NO Check IC901 and its peripheral circuits. 1-14 (No.MA260) 5.6Maintenance of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cott