Jvc-KDLH-300-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MA042 2004/1 CD RECEIVER MA04220041 KD-AR3000, KD-LH300 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2、 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-

3、6 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27 5TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . 1-28 Area suffix J - Northern America KD-AR3000 KD-LH300 KD-AR3000 Line input terminal Amplifier gain control KD-LH300 Power antenna control RadioFans.CN 收音机爱 好者资料库 1-2 (No.MA042) SPECIFICATION Design and specifications are subject to change without notice. AUDIO AMPLIFIER SECTION Maximum Po

5、wer OutputFront50 W per channel Rear50 W per channel Continuous Power Output (RMS) Front19 W per channel into 4 , 40 Hz to 20 000 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

6、8 allowance) Equalizer Control RangeFrequencies60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.4 kHz, 6 kHz, 12 kHz Level10 dB Frequency Response40 Hz to 20 000 Hz Signal-to-Noise Ratio70 dB Line-Out Level/Impedance KD-AR30001.5 V/20 k load Line-Out Level/Impedance KD-AR30005.0 V/20 k load (full scale) KD-LH3004.0

7、V/20 k load (full scale) Output Impedance1 k Subwoofer-Out Level/Impedance2.0 V/20 k load (full scale) TUNER SECTION Frequency RangeFM87.5 MHz to 107.9 MHz AM530 kHz to 1 710kHz FM TunerUsable Sensitivity11.3 dBf (1.0 V/75 ) 50 dB Quieting Sensitivity16.3 dBf (1.8 V/75 ) Alternate Channel Selectivit

8、y (400 kHz)65 dB Frequency Response40 Hz to 15 000 Hz Stereo Separation30 dB Capture Ratio1.5 dB MW TunerSensitivity20 V Selectivity35 dB CD PLAYER SECTION TypeCompact disc player Signal Detection SystemNon-contact optical pickup (semiconductor laser) Number of channels2 channels (stereo) Frequency

9、Response5 Hz to 20 000 Hz Dynamic Range96 dB Signal-to-Noise Ratio98 dB Wow and FlutterLess than measurable limit MP3 decoding formatMPEG 1/2 Audio Layer 3. Max. Bit Rate: 320 Kbps WMA (Windows Media Audio) decoding formatMax. Bit Rate: 192 Kbps GENERAL Power RequirementOperating VoltageDC 14.4 V (1

10、1 V to 16 V allowance) Grounding SystemNegative ground Allowable Operating Temperature0C to +40C (32F to 104F) Dimensions (W H D)Installation Size (approx.)182 mm 52 mm 159 mm (7-3/16 2-1/16 6-5/16) Panel Size (approx.)188 mm 58 mm 12 mm (7-7/16 2-5/16 1/2) Mass (approx.)1.6 kg (3.5 lbs) (excluding

11、accessories) RadioFans.CN 收音机爱 好者资料库 (No.MA042)1-3 SECTION 1 PRECAUTION 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 th

12、e 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.MA042) 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 trav

13、erse 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 players. Be careful to use proper grounding in the area where

14、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 Use an anti-static wrist strap to release any static electricity

15、 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 shorted parts to their original condition. (Refer to the text.) Do

16、 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 (optical pickup) to strong shocks, as it is a sensitive, comple

17、x 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 traverse unit. Be careful not to take too long a time when attaching

18、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 traverse unit is decomposed *Please refer to Disassembly method in the

19、 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 CDpickup may be destroyed by static electricity.) In the assembly, be sure to remove sold

20、er 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.MA042)1-5 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIF

21、IC SERVICE INSTRUCTIONS. 1-6 (No.MA042) SECTION 3 DISASSEMBLY 3.1Main body 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. (2) Remove the front panel assembly. Fig.1 3.1.2Removing the heat sink (See Fig.2) (1) From th

22、e left side of the main body, remove the two screws A and three screws B attaching the heat sink. Fig.2 Front panel assembly Detach button Heat sink AAB (No.MA042)1-7 3.1.3Removing the top chassis assembly (See Figs.3 to 6) Prior to performing the following procedures, remove the heat sink. Referenc

23、e: Remove the front panel assembly as required. (1) From the bottom side of the main body, remove the two screws C 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 ass

24、embly to the bottom chassis assembly. (See Figs.4 to 6.) (3) Lift the top chassis assembly in the direction of the arrow, disconnect the connector CN501 on the mechanism con- trol board from the connector CN702 on the main board. (See Figs.5 and 6.) (4) Take out the top chassis assembly from the bot

25、tom chassis assembly. Fig.3 Fig.4 Fig.5 Fig.6 Top chassis assembly C C Bottom chassis assembly Bottom chassis assembly Top chassis assembly D Top chassis assembly D Bottom chassis assembly Mechanism control board Main board CN702 CN501 Top chassis assembly Bottom chassis assembly Rear bracket D D 1-

26、8 (No.MA042) 3.1.4Removing the front chassis (See Figs.7 and 8) Prior to performing the following procedure, remove 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. Fig.7 Fig.8 3.1.

27、5Removing the mechanism control board (See Fig.9) Prior to performing the following procedures, remove the front panel assembly, heat sink and top chassis assembly. (1) Disconnect the card wire from the connector CN601 on the mechanism control board. (2) Remove the five screws F attaching the mechan

28、ism control board. (3) Release the joints a and b, remove the mechanism control board. Fig.9 Top chassis assembly Front chassis E Top chassis assembly Front chassis E Mechanism control board CN601 F F F a b (No.MA042)1-9 3.1.6Removing the CD mechanism assembly (See Fig.10) Prior to performing the fo

29、llowing procedures, remove the front panel assembly, heat sink and top chassis assembly. Reference: Remove the mechanism control board as required. (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

30、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

31、 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 CN701 on the main board in an upward direction, disconnect the

32、card wire from the connector CN701. (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 holder

33、s. (6) Take out the main board from the bottom chassis assem- bly. Fig.11 Fig.12 Top chassis G GG CD mechanism assembly Rear bracket HBottom chassis assembly Connector Wire holdersCN701 Stopper Bottom chassis assembly J J CN951 Wires Main board Card wire Front door mechanism assembly 1-10 (No.MA042)

34、 3.1.8Removing 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 t

35、wo screws K and three screws L attaching 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.)

36、Prior 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 M attaching the shaft holder to the bottom chas- sis. (2) Remove the five screws N attaching the front

37、 door mecha- nism assembly to the bottom chassis. Reference: When attaching the screws M and N, apply a locking agent them. (3) Take out the front door mechanism assembly from the bot- tom chassis. Fig.14 Rear bracket LLK K Main board Wire holder Slots Wire (KD-AR3000) Rear bracket Wire Bottom chass

38、is N N M Shaft holder Front door mechanism assembly (No.MA042)1-11 3.1.10 removing the front board (See Figs.15 to 18) 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 P attaching the rear cover

39、assembly to the front panel 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) From the left side of the front panel assembly, pull out the knob in the direction of the arrow 2 while pulling the front board in the

40、 direction of the arrow 1. (See Fig.17.) (4) Take out the front board from the front panel assembly. (See Fig.18.) Note: When removing the rear cover assembly and front board, be careful not to lose the comp. spring. (See Fig.18.) Fig.15 Fig.16 Fig.17 Fig.18 P Rear cover assembly P P Rear cover asse

41、mbly joints cjoints c joints cjoints c 12 Front panel assembly Front board Knob Front board Front panel assembly Comp. spring 1-12 (No.MA042) 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 of the body. (2) Lift the front side of t

42、he 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 (No.MA042)1-13 3.2.2Removing the connector board (See Figs.3 to 5) CAUTION: Before disconnecting the flexible wire from the pickup, solder the short-circuit point on the p

43、ickup. 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 the direction of the arrow to release the

44、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 Fr

45、ame 1-14 (No.MA042) 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) Unsolder the DET switch wire if necessary. Fig.6 Fig.7 Connector board DET switch Pickup DET switch Tab c Tab c DET switch wire Feed sw. holder (No.MA042)

46、1-15 3.2.4Removing the chassis unit (See Figs.8 and 9) Prior to performing the following procedure, remove the top cover and connector board. (1) Remove the two suspension springs (L) and (R) attaching the chassis unit to the frame. CAUTION: The shape of the suspension spring (L) and (R) are dif- fe

47、rent. Handle them with care. When reassembling, make sure that the three shafts on the underside of the chassis unit are inserted to the dampers certainly. Fig.8 Fig.9 Suspension spring (L) Suspension spring (L) Suspension spring (R) Suspension spring (R) Chassis unit Frame Chassis unit Frame Shafts

48、 Shaft Damper Damper Damper 1-16 (No.MA042) 3.2.5Removing the clamper assembly (See Figs.10 and 11) Prior to performing the following procedure, remove the top cover. (1) Remove the clamper arm spring. (2) Move the clamper assembly in the direction of the arrow to release the two joints d. Fig.10 Fi

49、g.11 Clamper arm spring Chassis rivet assembly Joint d Joint d Clamper assembly Clamper arm spring Clamper assembly Joint d Joint d Chassis rivet assembly (No.MA042)1-17 3.2.6Removing the loading / feed motor assembly (See Figs.12 and 13) Prior to performing the following procedure, remove the top cover, connector board and chassis unit. (1) Remove the screw C and move the loading / feed motor as- sembly in the direction of the arrow to remove it from the chassis rivet assembly. (2) Disconnect the wire from the loading / fe