Jvc-KSFX-834-R-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CASSETTE RECEIVER No.49571 Sep. 2000 COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD. KS-FX834R KS-FX834R Area Suffix E - Continental Europe Contents Safety precaution Disassembly method Adjustment method Description of major ICs This service manual is printed on 100% recycled paper. 1-2

2、1-3 1-10 1-14 RadioFans.CN 收音机爱 好者资料库 KS-FX834R 1-2 !CAUTION 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. Safety precaution RadioFans.CN 收音机爱 好者资料库 KS-FX834R 1-3 Disassembly method R

3、emoving the front panel unit (See Fig.1) 1. 2. Remove the two screws A attaching the front chassis. Insert a screwdriver to the two joints a on the side of the front chassis, two joints b on the right side and one joint c from upside, then detach the front chassis toward the front side. 1. Press the

4、 release switch and remove the front panel unit in the direction of the arrow. Removing the front chassis (See Fig.23) Removing the heat sink (See Fig.4) 1. Remove the three screws B attaching the heat sink on the left side of the body, and remove the heat sink. b a a b c A B B B Heat sink Fig.2 Fig

5、.1 Fig. 3 Fig. 4 Front chassis RadioFans.CN 收音机爱 好者资料库 KS-FX834R 1-4 Removing the bottom cover (See Fig.5) 1. 2. Turn the body upside down. Insert a screwdriver to the two joints d and two joints e on both sides of the body and the joint f on the back of the body, then detach the bottom cover from t

6、he body. Removing the rear panel (See Fig.6 ) 1. 2. 3. 4. Remove the front chassis. Remove the heat sink. Remove the bottom cover. Remove the five screws B attaching the rear panel and one screw C attaching the pine jack on the back of the body. Removing the main amplifier board assembly (See Fig.7)

7、 1. 2. 3. 4. 5. Remove the front chassis. Remove the bottom cover. Remove the rear panel. Remove the two screws D attaching the main amplifier board assembly on the top cover. Disconnect connector CP701 on the main amplifier board assembly from the cassette mechanism assembly. d e f Bottom cover Fig

8、. 5 Fig. 6 Fig. 7 B C B B D D CP701 Main board assembly KS-FX834R 1-5 Cassette mechanism assembly F F F Top cover Fig. 8 GG G G Fig. 9 Fig. 10 LCD & Key control board F Removing the Cassette mechanism assembly (See Fig.8) 1. 2. 3. 4. Remove the front chassis. Remove the bottom cover. Remove the main

9、 amplifier board assembly. Remove the fore screws F attaching the cassette mechanism assembly from the top cover. Removing the control switch board (See Fig.9 and 10 ) 1. 2. 3. Remove the front panel unit from the main body. Remove the five screws G attaching the rear cover on the back of the front

10、panel unit. Remove the control switch board from the front panel unit. KS-FX834R 1-6 For the 6pin harness extending from connector CN402 on the mecha control P.W.B, disconnect it from the head relay P.W.B. Disconnect the card wire from connector CN403 on the mecha control P.W.B. Remove the screw A a

11、ttaching the mecha control P.W.B. Move the tab a as shown in Fig.2 and remove the mecha control P.W.B. while moving it in the direction of the arrow. 1. 2. 3. 4. Removing the mecha control P.W.B. (See Fig.1 and 2) Disconnect the 6pin harness from connector CN402 and the card wire from CN403 on the m

12、echa control P.W.B. (Refer to Fig.1 and 2). Remove the four screws B on the bottom of the cassette mechanism. 1. 2. Removing the cassette mechanism assembly (See Fig.1 to 3) Fig.1 Cassette mechanism assy Head relay P.W.B. 6pin harness CN402 CN403 CN402 Mecha control P.W.B. Fig.2 Tab a Mecha control

13、P.W.B. Fig.3 Cassette mechanism assy B B A Mecha control P.W.B. CN403 KS-FX834R 1-7 Unsolder the soldering b on the head relay P.W.B. Remove the screw C attaching the head relay P.W.B. Remove the head relay P.W.B. in the direction of the arrow while releasing the two joints c. 1. 2. 3. Removing the

14、head relay P.W.B. (See Fig.4) Remove the E washer attaching the load arm using a pincette or something like that and remove the spring d. Move the part of the load arm marked upwards to release it from the axis of rotation. Then rotate the load arm in the direction of the arrow to remove it from the

15、 cach. 1. 2. Removing the load arm (See Fig.5) Prior to performing the following procedure, remove the head relay P.W.B. Remove the screw D attaching the sub chassis. Push the tab e in the direction of the arrow to detach the one side of the sub chassis. Then release the sub chassis from the tab f.

16、* 1. 2. Removing the sub chassis (See Fig.6) Prior to performing the following procedure, remove the head relay P.W.B., the load arm and the sub chassis. Remove the screw E attaching the reinforce bracket. Remove the reinforce bracket. Push the tab g fixing the cassette holder in the direction of th

17、e arrow and open the cassette holder and the holder arm upward until they stop at an angle of 45 degrees. Move the two joints h to the side and remove the cassette holder and the holder arm from the shaft. * 1. 2. 3. Removing the cassette holder and the holder arm in the eject mode (See Fig.7 and 8)

18、 Fig.4C Soldering b Joint c Fig.6 Tab f D Tab e Cach Head relay P.W.B. Head relay P.W.B. Fig.7 Reinforce bracket Reinforce bracket E Cassette holder Sub chassis Head relay P.W.B. Joint h Holder arm Load arm Joint h tab g Fig.5 Spring d Load arm E washer Cassette mecha chassis KS-FX834R 1-8 Prior to

19、performing the following procedure, remove the head relay P.W.B.and the sub chassis. Remove the two screws F attaching the play head (The spring under the play head comes off at the same time). * 1. Removing the play head (See Fig.9) Prior to performing the following procedure, remove the head relay

20、 P.W.B. and the sub chassis. Push each tab i in the direction of the arrow and pull out the pinch rollers on both sides. * 1. Removing the pinch roller assy (See Fig.9) Unsolder the soldering j on the reel disc P.W.B. Push the seven tabs k on the bottom of the cassette mechanism assembly in the dire

21、ction of the arrow. 1. 2. Removing the reel disc P.W.B. (See Fig.10) Unsolder the two soldering l of the motor and the sub motor. Release the sub motor from the three tabs m. Push the sub motor upward and pull out it. Remove the belt on the bottom of the cassette mechanism assembly and remove the tw

22、o screws G attaching the motor. 1. 2. 3. Removing the motor and the sub motor (See Fig.10 and 11) The motors can be detached before removing the load arm. ATTENTION: Fig.8 Cassette holder and holder arm Joint h Shaft Shaft Joint h Fig.9 Tab i Pinch roller assyPinch roller assy F Play head Spring Fig

23、.11 Sub motor Tab m Load arm Motor Soldering l Tab m Soldering l Tab m Soldering j Pinch roller assy Tab i Tab i Tab i Fig.10 Cassette mechanism assy Tabs k Reel disc P.W.B. Soldering j Tabs k G G Motor Belt Flywheel KS-FX834R 1-9 Prior to performing the following procedure, remove the head relay P.

24、W.B, the load arm, the sub chassis, the cassette holder, the holder arm and the reel disc P.W.B. Remove the belt on the bottom of the cassette mechanism assy. Remove the slit washer attaching the flywheel on the upper side of the cassette mechanism assy and pull out the flywheel downward. Then remov

25、e another flywheel in the same way. 1. 2. 3. Removing the flywheel (See Fig.10 and 12) Prior to performing the following procedure, remove the head relay P.W.B, the load arm, the sub chassis, the cassette holder and the holder arm. Disengage the part n inside of the reel driver which engages with th

26、e shaft, using a pincette or something like that. Then remove the reel driver from the shaft. Remove the reel driver spring and the reel table. * 1. 2. Removing the reel disc assy( ) (See Fig.12 to 14) When reassembling, make sure to use a new slit washer. ATTENTION: Fig.10 Cassette mechanism assy T

27、ab k Reel disc P.W.B. Soldering j Tab k G G Motor Belt Flywheel Fig.12 Plate The part n Reel driver Reel disc assy( ) Push aside the gear Tabs o Reel disc assy( ) The part n Reel driver Tab o Fig.13 Reel driver Shaft The part n Fig.14 Reel driver spring Reel table Slit washer Slit washer KS-FX834R 1

28、-10 Adjustment method Test instruments required for adjustment 1. Digital oscilloscope(100MHz) 2. Frequency Counter meter 3. Electric voltmeter 4. Wow & flutter meter 5. Test Tapes VT724. . For DOLBY level measurement VT739.For playback frequency measurement VT712.For wow flutter & tape speed measur

29、ement VT703. For head azimuth measurement 6. Torque gauge. Cassette type for CTG-N (mechanism adjustment) Measuring conditions(Amplifier section) Power supply voltage. DC14.4V (10.5 - 16V) Load impedance . 4 (2 Speakers connection) Line out. 20k Standard volume position Balance and Bass,Treble volum

30、e .Fader :Center(Indication0) Loudness,Dolby NR,Sound,Cruise:Off following conditions. Playback the test tape VT721. AM mode999kHz/62dB,INT/400Hz,30% modulation signal on receiving. FM mono mode97.5MHz/66dB,INT/400Hz,22.5kHz deviation pilot off mono FM stereo mode 1kHz,67.5kHz dev. pilot7.5kHz dev.

31、Output level0dB(1 V,50/open terminal) MC-109C For TAPE CURL confirmation (without Pad type) KS-FX834R 1-11 Head section view Cassette mechanism (Surface) Arrangement of adjusting & test points Motor assembly Tape speed adjust Playback head Azimuth screw B (Reverse) Azimuth screw B (Reverse) Azimuth

32、screw A (Forward) Azimuth screw A (Forward) Playback Head KS-FX834R 1-12 EXTKSRT002-18P Information for using a car audio service jig 1.Were advancing efforts to make our extension cords common for all car audio products. Please use this type of extension cord as follows. 2.As a U-shape type top cov

33、er is employed, this type of extension cord is needed to check operation of the mechanism assembly after disassembly. 3.Extension cord : EXTKSRT002-18P ( 18 pin extension cord ) For connection between mechanism assembly and main board assembly. Check for mechanism driving section such as motor ,etc.

34、 Disassembly method 1.Remove the bottom cover. 2.Remove the front panel assembly. 3.Remove the top cover . 4.Install the front panel. 5.Confirm that current is being carried by connecting an extension cord jig. Note Available to connect to the CP701 connector when in- stalling the front panel. Casse

35、tte mechanism to Main board to Cassette mechanism Front panel assembly Main boardMain board Extension cord EXTKSRT002-18P KS-FX834R 1-13 Mechanism adjustment section ItemAdjusting & Confirmation MethodsAdjustStd. Value 1.Check to see if the reading of the frequency counter & W ow flutter meter is wi

36、thin 2940-3090 Hz( FWD/REV ), and less than 0.35% ( JIS RMS ). 2.In case of out of specification, adjust the motor with a built- in volume resistor . 1.Play the test tape ( VT724 : 1kHz ) back and set the volume position at 2V . 2.Play the test tape ( VT739 )back and confirm 0 3dB at1kHz/ 10kHz and

37、-4+2dB at 1kHz/63Hz. 3.When 10kHz is out of specification, it will be necessary to read adjust the azimuth. Phase 0 45 Built-in volume resistor Tape Speed 2940-3090Hz Wow&Flutter Less than 0.35% (JIS RMS) Speaker out 1kHz/10kHz : 0dB 3dB, 63Hz/1kHz : -4dB+2dB, 1. Tape running adjustment 2. Azimuth a

38、djustment confirmation a) At forward play mode, make adjustment of peak of Lch / Rch output with Azimuth screw A. * For Oscilloscope litharge corrugation, set 45 as standard. b) At Reverse play mode, make adjustment of peak of Lch / Rch output with Azimuth screw B. * For Oscilloscope litharge corrug

39、ation, set 45 as standard. c) With AC volt meter confirm the difference of output for 4ch between Lch / Rch at forward play mode and Lch / Rch Reverse play mode being within 3.0dB. d) After operation, make confirmation of Lch / Rch azimuth output being within 1.0dB from adjustment value. a) At Forwa

40、rd playmode, using mirror tape, make adjustment with Azimuth screw A and Azimuth screw B, without curl of 4 parts of head tape guide. b) At Reverse play mode, using mirror tape, make adjustment with Azimuth screw A and Azimuth screw B, without tape curl of 4 parts of head guide. c) At Forward / Reve

41、rse play mode, make confirmation of no tape curl of 4 parts of head tape guide. 2.Tape Speed and Wow & Flutter 3.Playback Frequency response Azimuth screw A Azimuth screw B HEAD Tape guide OK HEADTAPE Tape curl NG KS-FX834R 1-14 2. Pin function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 2

42、2 23 24 PBTC1 PBOUT1 OUTREF1 TAPEIN1 Vcc NC LINEOUT1 TCH1 NC MSLPF G2FB G1FB MSTC MSOUT NC NRSW MUTESW TAPESW DRSW MSMODE MSSW NC TCH2 LINEOUT2 Pin No.Symbol - O O I - - O - - - - - - O - I I I I I I - - O Playback equalizer amplifier capacitance Playback equalizer amplifier output Output reference

43、TAPE input Power supply Line output Time constant for the HLS Cut-off frequency adjustment of the music sensor LPF Music signal interval detection Music signal interval detection Time constant for detecting music signal interval Music sensor out No use Dolby NR control Mute function control Playback

44、 equalizer amplifier control Head select control Music sensor mode control Music sensor control Time constant for the HLS Line output I/OFunction Pin No.SymbolI/OFunction 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 DIREF GND TAPEIN2 OUTREF2 PBOUT2 PBTC2 PBFB2 PBRIN2 PBGND PBFIN2 VCT PBREF PBFIN1

45、 PBGND PBRIN1 PBFB1 - - I O O - I I - I O O I - I I Resistance for setting the reference Ground TAPE input Output reference Playback equalizer amplifier output Playback equalizer amplifier capacitance Playback equalizer amplifier feedback Playback equalizer amplifier input Playback equalizer amplifi

46、er ground Playback equalizer amplifier input Center Playback equalizer amplifier reference Playback equalizer amplifier input Playback equalizer amplifier ground Playback equalizer amplifier input Playback equalizer amplifier feedback PBFB2 PBRIN2 PBGND PBFIN2 VCT PBREF PBFIN1 PBGND PBRIN1 PBFB1 MSM

47、ODE DRSW TAPESW MUTESW NRSW MSOUT MSTC G1FB G2FB PBTC2 PBOUT2 OUTREF2 TAPEIN2 GND DIREF LINEOUT2 TCH2 NC MSSW PBTC1 PBOUT1 OUTREF1 TAPEIN1 Vcc NC LINEOUT1 TCH1 NC MSLPF 12345678910 30292827262524232221 20 19 18 17 16 15 14 13 12 11 31 32 33 34 35 36 37 38 39 40 7k/12k 300k F2 F1 30k 30k 45k 300k 7k/

48、12k F3 OFF/B 100k T1 - + + - 70 /12070 /120 x1 x1 T2 100kOFF/B NR NR BIAS MUTE TAPE EQ FWD/RVS LPF+ - DET Vcc MS MODE NR MODE MS ON/ OFF - + NC + - 1.Pin layout & block diagram CXA2560Q (IC401) : Dolby B type noise reduction system with play back equalizer amp. Description of major ICs KS-FX834R 1-15 123456789101112 BA4905-V3 (IC901) : Regulator 1.Terminal layout 2.Block diagram EXT EXTACCAUDIO 9VCTRLILM 10VGND RESET RESETCOMPVDD 5.7VCD 8VVCCAJ 1 2 3 4 5 6 7 8 9 10 11 12 37K 5K REGULATOR Overvoltage protection circuit Pin no. Symbol