Jvc-KDG-814-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.MA185 2005/3 CD RECEIVER MA18520053 KD-G814 TABLE OF CONTENTS 1PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SER

2、VICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 4ADJUSTMENT

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29 A

4、rea suffix UI - India RadioFans.CN 收音机爱 好者资料库 1-2 (No.MA185) SPECIFICATION Design and specifications are subject to change without notice. AUDIO AMPLIFIER SECTION Maximum Power OutputFront50 W per channel Rear50 W per channel Continuous Power Output (RMS) Front19 W per channel into 4 , 40 Hz to 20 0

5、00 Hz at no more than 0.8% total harmonic distortion. Rear19 W per channel into 4 , 40 Hz to 20 000 Hz at no more than 0.8% total harmonic distortion. Load Impedance4 (4 to 8 allowance) Equalizer Control RangeLow12 dB (60 Hz, 80 Hz, 100 Hz, 120 Hz) Mid12 dB High12 dB (8 kHz, 10 kHz, 12 kHz, 15 kHz)

6、Frequency Response40 Hz to 20 000 Hz Signal-to-Noise Ratio70 dB Line-Out Level/Impedance5.0 V/20 k load (full scale) Output Impedance1 k Subwoofer-Out Level/Impedance2.0 V/20 k load (full scale) Other TerminalsCD changer, SUBWOOFER TUNER SECTION Frequency RangeFM87.5 MHz to 108.0 MHz AM531 kHz to 1

7、602 kHz FM TunerUsable Sensitivity11.3 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 d

8、isc player Signal Detection 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 MP3 Decoding FormatMPEG1/2 Audio Layer 3 Max. Bit Rate:

9、 320 kbps WMA (Windows Media Audio) Decoding FormatMax. Bit Rate: 192 kbps GENERAL Power RequirementOperating VoltageDC 14.4 V (11 V to 16 V allowance) Grounding SystemNegative ground Allowable Operating Temperature0C to +40C Dimensions (W H D)Installation Size (approx.)182 mm 52 mm 159 mm Panel Siz

10、e (approx.)188 mm 58 mm 12 mm Mass (approx.)1.5 kg (excluding accessories) RadioFans.CN 收音机爱 好者资料库 (No.MA185)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 r

11、epair of this system. ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. RadioFans.CN 收音机爱 好者资料库 1-4 (No.MA185) 1.2Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabr

12、ic, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). 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

13、 players. Be careful to use proper grounding in the area where repairs are being performed. (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 U

14、se an anti-static wrist strap to release any static electricity built up in your body. (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 sho

15、rted parts to their original condition. (Refer to the text.) 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. 1.3Handling the traverse unit (optical pickup) (1) Do not subject the traverse unit

16、(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-static pin when replacing the traver

17、se 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 turn it. 1.4Attention when travers

18、e unit is decomposed *Please refer to Disassembly method in the text for the CD pickup 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

19、 by static electricity.) In the assembly, be sure to remove solder from the short land after connecting the flexible wire. 1M (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate Pickup Short-circuit point (Soldering) Flexible wire (No.MA185)1-5 1.5Important for las

20、er products 1.CLASS 1 LASER PRODUCT 2.DANGER : 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

21、. 4.CAUTION : The CD,MD and DVD player uses 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

22、malfunction, the laser is able to function. 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

23、 case of an adjustment or operation check. 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 : Avat

24、taessa ja suojalukitus ohitettuna tai viallisena 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-

25、6 (No.MA185) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MA185)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

26、assembly. (2) Take out the front panel assembly. Fig.1 3.1.2Removing the heat sink (See Fig.2) (1) From the left side of the main body, remove the two screws A and three screws B attaching the heat sink. (2) Take out the heat sink. Fig.2 Front panel assembly Detach button Heat sink AAB 1-8 (No.MA185

27、) 3.1.3Removing the top chassis assembly (See Figs.3 to 6) Prior to performing the following procedures, remove the heat sink. Reference: Remove the front panel assembly as required. (Refer to 3.1.1 Removing the front panel assembly) (1) From the bottom side of the main body, remove the two screws C

28、 attaching the top chassis assembly to the bottom chassis assembly. (See Fig.3) (2) From the both and rear sides of the main body, remove the four screws D attaching the top chassis assembly to the bottom chassis assembly. (See Figs.4 to 6) (3) Lift the top chassis assembly in the direction of the a

29、rrow, and disconnect the connector CN501 on the mechanism control board from the connector CN101 on the main board. (See Figs.5 and 6) (4) Take out the top chassis assembly from the bottom chassis assembly. Fig.3 Fig.4 Fig.5 Fig.6 Top chassis assembly C C Bottom chassis assembly Bottom chassis assem

30、bly Top chassis assembly D Top chassis assembly D Bottom chassis assembly Mechanism control board Main board CN101 CN501 Top chassis assembly Bottom chassis assembly Rear bracket D D (No.MA185)1-9 3.1.4Removing the front chassis (See Figs.7 and 8) Prior to performing the following procedure, remove

31、the front panel assembly, heat sink and top chassis assembly. (1) From the both sides of the top chassis assembly, remove the two screws E attaching the front chassis. (See Figs.7 and 8) (2) Take out the front chassis Fig.7 Fig.8 3.1.5Removing the mechanism control board (See Fig.9) Prior to perform

32、ing the following procedures, remove the front panel assembly, heat sink and top chassis assembly. Reference: Remove the front chassis as required. (Refer to 3.1.4 Remov- ing the front chassis) (1) Disconnect the card wire from the connector CN601 on the mechanism control board. (2) Remove the five

33、screws F attaching the mechanism control board. (3) Release the claw a, and take out the mechanism control board. Reference: After attaching the mechanism control board, attach it to the claw a and pass the slot b of it into the boss of the CD mech- anism assembly. Fig.9 Top chassis assembly Front c

34、hassis E Top chassis assembly Front chassis E Mechanism control boardCN601 F F F Slot b Craw a 1-10 (No.MA185) 3.1.6Removing the CD mechanism assembly (See Fig.10) Prior to performing the following procedures, remove the front panel assembly, heat sink and top chassis assembly. Reference: Remove the

35、 front chassis and mechanism control board as re- quired.(Refer to 3.1.4 Removing the front chassis and 3.1.5 Removing the mechanism control board) (1) From the inside of the top chassis assembly, remove the three screws G attaching the CD mechanism assembly. (2) Take out the CD mechanism assembly f

36、rom the top chas- sis. Fig.10 3.1.7Removing the main board (See Figs.11 and 12) Prior to performing the following procedures, remove the front panel assembly, heat sink and top chassis assembly. (1) From the rear side of the bottom chassis assembly, remove the two screws H attaching the rear bracket

37、 to the bottom chassis assembly. (See Fig.11) (2) From the top side of the bottom chassis assembly, remove the two screws J attaching the main board to the bottom chassis assembly. (See Fig.12) (3) Release the stopper of the connector CN702 on the main board in an upward direction, disconnect the ca

38、rd wire from the connector CN702. (See Fig.12) (4) Disconnect the wire from the connector of the front door mechanism assembly. (See Fig.12) (5) Disconnect the wire from the connector CN951 on the main board. (See Fig.12) Reference: After connecting the wires, fix the wires with the wire clamp. (6)

39、Take out the main board from the bottom chassis assem- bly. Fig.11 Fig.12 Top chassis G GG CD mechanism assembly Rear bracket H Bottom chassis assembly Connector Wire clampCN702 Stopper Bottom chassis assembly J J CN951 WiresMain board Card wire Front door mechanism assembly (No.MA185)1-11 3.1.8Remo

40、ving the rear bracket (See Fig.13) Prior to performing the following procedures, remove the front panel assembly, heat sink, top chassis assembly and main board. (1) From the rear side of the main board, remove the wires from the rear bracket in the direction of the arrow. (2) Remove the screw K, th

41、ree screws L and screw M attach- ing the rear bracket to the main board. Reference: After attaching the rear bracket to the main board, pass the wires through the wire holder and insert them into the slots of the rear bracket. Fig.13 3.1.9Removing the front door mechanism assembly (See Fig.14) Prior

42、 to performing the following procedures, remove the front panel assembly, heat sink, top chassis assembly and main board. (1) From the top side of the bottom chassis assembly, remove the screw N attaching the FPC guide to the bottom chassis. (2) Remove the five screws P attaching the front door mech

43、a- nism assembly to the bottom chassis. Reference: When attaching the screws N and P, apply a locking agent them. (3) Take out the front door mechanism assembly from the bot- tom chassis. Fig.14 Rear bracket LLK M Main board Slots Wire Rear bracket Wire holder Bottom chassis P P N FPC guide Front do

44、or mechanism assembly 1-12 (No.MA185) 3.1.10 Removing the switch board (See Figs.15 to 17) Prior to performing the following procedures, remove the front panel assembly. (1) From the rear side of the front panel assembly, remove the four screws Q attaching the rear cover assembly to the front panel

45、assembly. (See Fig.15) (2) Release the twelve joints c of the front panel assembly and remove the rear cover assembly. (See Fig.16) (3) Take out the switch board from the front panel assembly. (See Fig.17) Note: When removing the rear cover assembly and front board, be careful not to lose the comp.

46、spring. (See Fig.17) Fig.15 Fig.16 Fig.17 Q Rear cover assembly Q Q Rear cover assembly Joints cJoints c Joints cJoints c Switch board Front panel assembly Comp. spring (No.MA185)1-13 3.2CD Mechanism section 3.2.1Removing the top cover (See Figs.1 and 2) (1) Remove the four screws A on the both side

47、 of the body. (2) Lift the front side of the top cover and move the top cover backward to release the two joints a. Fig.1 Fig.2 A A A Joints aTop cover Joints a Top cover 1-14 (No.MA185) 3.2.2Removing the connector board (See Figs.3 to 5) CAUTION: Before disconnecting the flexible wire from the pick

48、up, solder the short-circuit point on the pickup. No observance of this in- struction may cause damage of the pickup. (1) Remove the screw B fixing the connector board. (2) Solder the short-circuit point on the pickup. (3) Disconnect the flexible wire from the pickup. (4) Move the connector board in

49、 the direction of the arrow to release the two joints b. (5) Unsolder the wires on the connector board if necessary. CAUTION: Unsolder the short-circuit point after reassembling. Fig.3 Fig.4 Fig.5 B Connector board PickupShort-circuit point Joints b Wires Pickup Short-circuit point (Soldering) Flexible wire B Flexible wire Connector board Frame (No.MA185)1-15 3.2.3Removing the DET switch (See Figs.6 and 7) (1) Extend the two tabs c of the feed sw. holder and pull out the switch. (2)