Jvc-KSFX-8-R-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CASSETTE RECEIVER No.49580 Jan. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. KS-FX8R KS-FX8R Area Suffix EContinental Europe 40Wx4 TP DISP RPT SSM SCM MO RND 789101112 PTY CD-CH FM/AM TAPE /I ATT / DOLBY B NRDAB RDS KS-FX8RKS-FX8R Contents Safety precaution Disassembly method Adj

2、ustment method Description of major ICs 1-2 1-3 1-10 1-14 RadioFans.CN 收音机爱 好者资料库 KS-FX8R 1-2 ! 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

3、 KS-FX8R 1-3 Press the release switch and remove the front panel unit in the direction of the arrow. 1. Disassembly method Removing the front panel unit (See Fig.1) Remove the two screws A attaching the front chassis. Insert a screwdriver to the two joints a on the left side of the front chassis, tw

4、o joints b on the right side and one joint c from upside, then detach the front chassis toward the front side. 1. 2. Removing the front chassis (See Fig.23) Remove the three screws B attaching the heat sink on the left side of the body, and remove the heat sink. 1. Removing the heat sink (See Fig.4)

5、 Joint c Heat sink Fig.2 Fig.1 Fig. 3 Fig. 4 Front panel unit Front chassis A Front chassis Joint a Joint a Joint b Joint b B B RadioFans.CN 收音机爱 好者资料库 KS-FX8R 1-4 Prior to performing the following procedure, remove the front chassis and the heat sink. Turn the body upside down. Insert a screwdriver

6、 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 the body. 1. 2. Removing the bottom cover (See Fig.5) Prior to performing the following procedure, remove the front chassis, the heat sink and bottom cover. Remo

7、ve the five screws C attaching the rear panel and one screw D attaching the pine jack on the back of the body. 1. Removing the rear panel (See Fig.6 ) Prior to performing the following procedure, remove the front chassis, the heat sink, bottom cover and the rear panel. Remove the two screws E attach

8、ing the main amplifier board assembly on the top cover. Disconnect connector CP401 on the main amplifier board assembly from the cassette mechanism assembly. 1. 2. Removing the main amplifier board assembly (See Fig.7) Bottom cover Fig. 5 Fig. 6 Fig. 7 Main board assembly Joints d Joints e Joint f C

9、 C C D Rear panel CP401 E E KS-FX8R 1-5 Prior to performing the following procedure, remove the front chassis, the heat sink, bottom cover and the main amplifier board assembly. Remove the four screws F attaching the cassette mechanism assembly from the top cover. 1. Removing the cassette mechanism

10、assembly (See Fig.8) Remove the front panel unit from the main body. Remove the five screws G attaching the rear cover on the back of the front panel unit. Remove the control switch board from the front panel unit. 1. 2. 3. Removing the (LCD & key) control switch board (See Fig.9 and 10 ) Cassette m

11、echanism assembly F F F Top cover Fig. 8 GG G G Fig. 9 Fig. 10 LCD & Key control board F KS-FX8R 1-6 For the 6pin wire extending from connector CN402 on the head amplifier board, disconnect it from the head relay board. Disconnect the card wire from connector CN403 on the head amplifier board. Remov

12、e the screw A attaching the head amplifier board. Move the tab a as shown in Fig.2 and remove the head amplifier board while moving it in the direction of the arrow. 1. 2. 3. 4. Removing the head amplifier board. (See Fig.1 and 2) Disconnect the 6pin wire from connector CN402 and the card wire from

13、CN403 on the head amplifier board (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 board 6pin wire CN402 CN403 CN402 Head amplifier board Fig.2 Tab a Head

14、 amplifier board Fig.3 Cassette mechanism assy B B A Head amplifier board CN403 KS-FX8R 1-7 Unsolder the soldering b on the head relay board. Remove the screw C attaching the head relay board. Remove the head relay board in the direction of the arrow while releasing the two joints c. Removing the he

15、ad relay board (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 ca

16、ch. Removing the load arm (See Fig.5) Prior to performing the following procedure, remove the head relay board. 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. Removing

17、the sub chassis (See Fig.6) Prior to performing the following procedure, remove the head relay board, 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 the arrow and open t

18、he 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. Removing the cassette holder and the holder arm in the eject mode (See Fig.7 and 8) Fig.4C Soldering b Joint c F

19、ig.6 Tab f D Tab e Cach Head relay board Head relay board Fig.7 Reinforce bracket Reinforce bracket E Cassette holder Sub chassis Head relay board Joint h Holder arm Load arm Joint h tab g Fig.5 Spring d Load arm E washer Cassette mecha chassis KS-FX8R 1-8 Prior to performing the following procedure

20、, remove the head relay board, the load arm, the sub chassis, the cassette holder, the holder arm and the reel disc board. 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 fly

21、wheel downward. Then remove 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 board, the load arm, the sub chassis, the cassette holder and the holder arm. Disengage the part n inside of the reel dr

22、iver which engages with the 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. Removing the reel disc assy( I ) (See Fig.12 to 14) When reassembling, make sure to use a new slit washer. ATTENTION: Fig.10 Casse

23、tte mechanism assy Tab k Reel disc board Soldering j Tab k G G Motor Belt Flyhwheel Fig.12 Plate The part n Reel driver Reel disc assy( II ) Push aside the gear Tabs o Reel disc assy( I ) The part n Reel driver Tab o Fig.13 Reel driver Shaft The part n Fig.14 Reel driver spring Reel table Slit washe

24、r Slit washer KS-FX8R 1-9 Release the plate from the three tabs o. Push aside the gear over the reel table using a pincette or something like that. Remove the reel disc assy ( II ) as with the reel disc assy ( I ). 1. 2. 3. Removing the reel disc assy( II ) (See Fig.12 to 15) Do not break the front

25、panel tab fitted to the metal cover. ATTENTION: Prior to performing the following procedure, remove the reel disc ( I ). ATTENTION: Fig.15 Push aside the gear and reattach the reel disc Assy( I ). Reel disc assy( II ) KS-FX8R 1-10 Adjustment method Test Instruments reqired for adjustment 1. Digital

26、osclloscope(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 measurement VT703. For head azimuth measurement 6. Torque gauge. Cassette type for

27、CTG-N (mechanism adjustment) Measuring conditions(Amplifier section) Power supply voltage. DC14.4V (10.5 - 16V) Load impedance . 4 (2Speakers connection) Line out. 20k Standard volume position Balance and Bass,Treble volume .Fader :Center(Indication0) Loudness,Dolby NR,Sound,Cruise:Off Volume positi

28、on is about 2V at speaker output with following conditions.Playback the test tape VT721. AM mode999kHz/62dB,INT/400Hz,30% modulation signal on recieving. FM mono mode97.9MHz/66dB,INT/400Hz,22.5kHz deviation pilot off mono FM stereo mode 1kHz,67.5kHz dev. pilot7.5kHz dev. Output level0dB(1 V,50 /open

29、 terminal) KS-FX8R 1-11 Playback head Head azimuth screw Fixed screw Height adjusting screw c Height adjusting screw b Height adjusting screw a Arrangement of adjusting & test points Head section view Cassette mechanism (Surface) Tape speed adjust Motor assembly Playback head Azimuth screw KS-FX8R 1

30、-12 Extension cord : EXTKSRT002-6P EXTKSRT002-6P Front panel assembly Main board Cassette mechanism Information for using a car audio service jig 1.For 1995 and 1996 , were advancing efforts to make our extension cords common for all car audio products. Please use this type of extension cord as foll

31、ows. 2.As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the mechanism assembly after disassembly. 3.Extension cord : EXTKSRT002-6P ( 6 pin extension cord ) For connection between mechanism assembly and main board assembly. Check for mechanism drivi

32、ng section such as motor ,etc. 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 CN701 connector when in- s

33、talling the front panel. KS-FX8R 1-13 Mechanism adjustment section ItemAdjusting & Confirmation MethodsAdjustStd. Value Head Height Adjustment Note Adjust the azimuth directly. When you adjust the height us- ing a mirror tape, remove the cassette housing from the mechanism chassis. After installing

34、the cassette housing, perform the azimuth adjustment. 1.load the mirror tape ( SCC-1659 ). Adjust with height adjustmentscrew (a) and azimuth adjustment screw (b) so that line A of the mirror tape runs in the center between Lch and Rch in the reverse play mode. 2.After switching from REV to FWD then

35、 to REV, check that the head position set in procedure 1 is not changed. *If the position has shifted, adjust again and check. 3.Adjust the azimuth screw (b) so that line B of the mirror tape runs in the center between Lch and Rch in the forward play mode. Head Azimuth Adjustment 1.Load the test tap

36、e ( VT724: 1kHz ) and play it back in the reverse play mode. set the Rch output level to maximum. 2.Load the test tape ( VT703: 10kHz ) and play it back in the forward play mode. Adjust the Rch and Lch output levels tomaximum, with azimuth adjustment screw (b). In this case, the phase difference sho

37、uld be within 45 . 3.Engage the reverse mode and adjust the output level to maximum, with azimuth adjustment screw (c). *The phase difference should be 45_Kor more. 4.When switching between forward and reverse modes, the difference between channels should be within 3dB. *Between FWD Lch and Rch, REV

38、 Lch and Rch. 5.When the test tape ( VT721 : 315Hz ) is played back, the level difference between channels should be within 1.5dB. 1.Check to see if the reading of the frequency counter & Wow flutter meter is within 2940-3090 Hz( FWD/REV ), and less than 0.35% ( JIS RMS ). 2.In case of out of specif

39、ication, 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/ - 8kHz and -4+2dB at 1kHz/125Hz. 3.When 8kHz is out of specification, it will be necessary to read

40、adjust the azimuth. Head shield Head shield The head is at low position during FWD. The head is at height position during REV. A Line B Line Phase screw (c) screw (a) screw (b) Head azimuth screw Fixed screw 0 45 Built-in volume resistor Tape Speed 2940-3090Hz Wow&Flutter Less than 0.35% (JIS RMS) S

41、peaker out 1kHz/8kHz : 0dB_3dB, 125Hz/1kHz : -4dB+2dB, 1.Head azimuth 2.Tape Speed and Wow & Flutter 3.Playback Frequency response KS-FX8R 1-14 Pin No.Port NameI/ODescriptions 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 KEY 0 KEY 1 K

42、EY 2 LEVEL SM SQ LCDCE LCDDA LCDSCK BUSI/O UNLOCK BUSSI BUSSO BUSSCK NC NC NC NC NC NC GNDPORT VDDPORT AM AFCK MONO FM SEEK/STP NC IFC VDDPLL FMOSC AMOSC GNDPLL AMEO FMEO IC SD/ST STAGE0 NC F/R I I I I I I O O O I - I O I/O - - - - - - - - O O O O O I I - I - - O O - I I - O Key input 0 Key input 1

43、Key input 2 Level meter input S.meter level input S.Quality level input CE output to LCD driver Data output to LCD driver Clock output to LCD driver I/O selector output for J-BUS, H : OUT, L: INPUT Non connect J-BUS Data input J-BUS Data output J-BUS Clock in/output Non connect Non connect Non conne

44、ct Non connect Non connect Non connect Port GND Port Vdd Non connect AF check output, L: AF check Monaural on /off selecting output, H:mono on FM/AM switching output L : FM H : AM Auto seek /stop selecting output, H: Seek, L:Stop Pulse signal input port for Cruise control FM/AM midle frequency count

45、er input PLL Vdd FM/AM limited generator frequency input None connect PLL GND AM error out output FM error out output GND Station detector, Stereo signal input, H:Find Station, L:Stereo Pull up Non connect Main motor output UPD178018AGC-551 (IC701) : Main system control CPU 1. Pin layout 2. Pin func

46、tion 1 20 60 41 21 40 80 61 Description of major ICs KS-FX8R 1-15 Pin No. Port NameI/ODescriptions 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 NC NC TELMUTE TAPEIN I2CCLK I2CDAO I2CDAI NC NC NC NC NC NC NC TAPE TUNER CD NC N

47、C MUTE POWER NC NC NC NC NC ON STOP RDSCK RDSDA REMOCON DETACH BUSINT REGCPU GND X2 X1 REGOSC VDD RESET - - O I O O I - - - - - - - - - - - - O O - - - - - I O I I I I I - - - I - - - Non connect Non connect Telephone mute signal detection input TAPE input I2C information clock output I2C informatio

48、n data output I2C information clock input Non connect Non connect Non connect Non connect Non connect Non connect Non connect Non connect Non connect Non connect Non connect Non connect Mute output Power ON /OFF switching output , H : power on Non connect Non connect Non connect Non connect Non conn

49、ect CPU power supply STOP signal output terminal Clock input for RDS RDS data input Remocom input Detach signal input H : Power save Cut-in input for J-BUS signal Regulator for CPU power supply, Connect the GND with0.1 F. Ground Connecting the crystal oscillator for system clock Connecting the crystal oscillator for system clock Regulator for oscillator cir