Jvc-KSFX-893-Service-Manual(1) 电路图 维修手册.pdf

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1、1-1 KS-FX893 SERVICE MANUAL CASSETTE RECEIVER No.49763 Nov. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. KS-FX893 KS-FX893 Area Suffix UFChina Contents Safety precaution Disassembly method 1-2 1-3 Adjustment method Description of major ICs 1-11 1-1524 RadioFans.CN 收音机爱 好者资料库 1-2 KS-FX893 ! Burr

2、s 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 ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. RadioFans

3、.CN 收音机爱 好者资料库 1-3 KS-FX893 Disassembly method 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. Removi

4、ng the front chassis (See Fig.12) Removing the heat sink (See Fig.3) 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.1 Fig. 3 Front chassis RadioFans.CN 收音机爱 好者资料库 1-4 KS-FX893 Removing the bottom cove

5、r (See Fig.4) 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 the body. Removing the rear panel (See Fig.5 ) 1. 2. 3. 4. Remoe the front chassis. Remove the

6、 heat sink. Remove the bottom cover. Remove the seven 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.6) 1. 2. 3. 4. 5. Remove the front chassis. Remove the bottom cover. Remove the rear panel. Rem

7、ove 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. 4 Fig. 5 Fig. 6 B C B B D D CP701 Main board assembly 1-5 KS-FX893 Cassette mechanism assem

8、bly F F F Top cover Fig. 7 G G G G Fig. 8 Fig. 9 LCD & Key control board F Removing the Cassette mechanism assembly (See Fig.7) 1. 2. 3. 4. Remove the front chassis. Remove the bottom cover. Remove the main amplifier board assembly. Remove the fore screws F attaching the cassette mechanism assembly

9、from the top cover. Removing the control switch board (See Fig.8 and 9 ) 1. 2. 3. Remove the front panel unit from the main body. Remove the four screws G attaching the rear cover on the back of the front panel unit. Remove the control switch board from the front panel unit. 1-6 KS-FX893 For the 6pi

10、n 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. Remove the screw A attaching the head amplifier board. Move the tab a as shown in Fig.2 and remove the head amplifier

11、 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 CN403 on the head amplifier board (Refer to Fig.1 and 2). Remove the four screws B on the bottom of the cassette

12、 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 amplifier board Fig.3 Cassette mechanism assy B B A Head amplifier board CN403 1-7 KS-FX893 Unsolder the solder

13、ing 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. 1. 2. 3. Removing the head relay board (See Fig.4) Remove the E washer attaching the load arm using a pincette or something li

14、ke 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 cach. 1. 2. Removing the load arm (See Fig.5) Prior to performing the following procedure, remove the he

15、ad 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. 1. 2. Removing the sub chassis (See Fig.6) Prior to performing the following procedure, remove the head r

16、elay 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 the cassette holder and the holder arm upward until they stop at an angle of 45 degrees. Mo

17、ve 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) Fig.4C Soldering b Joint c Fig.6 Tab f D Tab e Cach Head relay board Head relay board Fig.7 Reinforce bracket

18、 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 1-8 KS-FX893 Prior to performing the following procedure, remove the head relay board and the sub chassis. Remove the two screws F attac

19、hing 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 board and the sub chassis. Push each tab i in the direction of the arrow and pull out the pinch rollers on both sid

20、es. 1. Removing the pinch roller assy (See Fig.9) Unsolder the soldering j on the reel disc board. Push the seven tabs k on the bottom of the cassette mechanism assembly in the direction of the arrow. 1. 2. Removing the reel disc board (See Fig.10) Unsolder the two soldering l of the motor and the s

21、ub 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 two screws G attaching the motor. 1. 2. 3. Removing the motor and the sub motor (See Fig.10 and 11) The motors can be deta

22、ched 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.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 F

23、ig.10 Cassette mechanism assy Tabs k Reel disc board Soldering j Tabs k G G Motor Belt Flyhwheel 1-9 KS-FX893 Prior to performing the following procedure, 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 b

24、ottom 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 remove another flywheel in the same way. 1. 2. 3. Removing the flywheel (See Fig.10 and 12) Prior to performing the following

25、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 driver which engages with the shaft, using a pincette or something like that. Then remove the reel driver from the shaft. Remove the reel driver spri

26、ng 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 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( ) Push

27、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 1-10 KS-FX893 Release the plate from the three tabs o. Push aside the gear over the reel table using a pincette or something like that

28、. Remove the reel disc assy ( ) as with the reel disc assy ( ). 1. 2. 3. Removing the reel disc assy( ) (See Fig.12 to 15) Do not break the front panel tab fitted to the metal cover. ATTENTION: Prior to performing the following procedure, remove the reel disc ( ). ATTENTION: Fig.15 Push aside the ge

29、ar and reattach the reel disc Assy( ). Reel disc assy( ) 1-11 KS-FX893 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 playb

30、ack frequency measurement VT712.For wow flutter & tape speed measurement 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 (2Speakers connection) Li

31、ne out. 20k Standard volume position Balance and Bass,Treble volume .Fader :Center(Indication0) Loudness,Dolby NR,Sound,Cruise:Off Volume position is about 2V at speaker output with following conditions. Playback the test tape VT721. AM mode1000kHz/62dB,INT/400Hz,30% modulation signal on receiving.

32、FM mono mode97.5MHz/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 terminal) MC-109C For TAPA CURL confirmation (without Padd type) 1-12 KS-FX893 Head section view Cassette mechanism (Surface) Arrangement of adjusting &

33、test points Motor assembly Tape speed adjust Playback head Azimuth screw B (Reverse) Azimuth screw B (Reverse) Azimuth screw A (Forward) Azimuth screw A (Forward) Playback Head 1-13 KS-FX893 EXTKSRT002-18P Information for using a car audio service jig 1.Were advancing efforts to make our extension c

34、ords common for all car audio products. Please use this type of extension cord as follows. 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 : EXTKSRT002-18P ( 18 pin extension cord ) For

35、connection between mechanism assembly and main board assembly. Check for mechanism driving 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 conne

36、cting an extension cord jig. Note Available to connect to the CP701 connector when in- stalling the front panel. Cassette mechanism to Main board to Cassette mechanism Front panel assembly Main board Extension cord EXTKSRT002-18P CP701 1-14 KS-FX893 Mechanism adjustment section ItemAdjusting & Confi

37、rmation MethodsAdjustStd. Value 1.Check to see if the reading of the frequency counter & W ow flutter meter is within 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 )

38、 back and set the volume position at 2V . 2.Play the test tape ( VT739 )back and confirm 0 3dB at1kHz/ 10kHz and -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 tha

39、n 0.35% (JIS RMS) Speaker out 1kHz/10kHz : 0dB 3dB, 63Hz/1kHz : -4dB+2dB, 1. Tape running adjustment 2. Azimuth adjustment 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 Revers

40、e play mode, make adjustment of peak of Lch / Rch output with Azimuth screw B. * For Oscilloscope litharge corrugation, 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) Aft

41、er operation, make confirmation of Lch / Rch azimuth output being within 1.0dB from adjustment value. a) At Forward 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 adju

42、stment with Azimuth screw A and Azimuth screw B, without tape curl of 4 parts of head guide. c) At Forward / Reverse 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 guid

43、e OK HEADTAPE Tape curl NG 1-15 KS-FX893 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 SDA GND OUTLR OUTLF TL B2L B1L IVL ILL QSL IDL MUTE ICL IMD IBL IAL SCL VCC OUTRR OUTRF TR B2R B1R IVR ILR QSR IDR Vref ICR CAP IBR IAR CD-CH TAPE TUNER POWER SUPPLY SOURCE

44、 SELECTOR VOLUME 1 +20 to -31 dB LOUDNESS LEFT BASS LEFT +15 dB TREBLE LEFT +12 dB BASS RIGHT +15 dB TREBLE RIGHT +12 dB MUTE FUNCTION ZERO CROSS DETECTOR VOLUME 2 0 to 55 dB BALANCE FENDER REAR VOLUME 2 0 to 55 dB BALANCE FENDER FRONT HC BUS REC VOLUME 2 0 to -55dB BALANCE FENDER FRONT VOLUME 2 0 t

45、o -55dB BALANCE FENDER REAR VOLUME 1 +20 to -31 dB LOUDNESS RIGHT LOGIC 21 31 2 19 16 15 13 11 22 20 18 17 14 23252426 2728 30 29 1 32 3 4 108976512 1. Pin layout 3. Pin functions 2. Block diagram 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin No. Pin No. 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

46、SDA GND OUTLR OUTLF TL B2L B1L IVL ILL QSL IDL MUTE ICL IMO IBL IAL Serial data input/output. Ground. output left rear. output left front. Treble control capacitor left channel or input from an external equalizer. Bass control capacitor left channel or output to an external equalizer. Bass control c

47、apacitor left channel. Input volume 1. left control part. Input loudness. left control part. Output source selector. left channel. Not used Not used Input C left source. Not used Input B left source. Input A left source. I/O - O O I - - I I O - - I - I I Symbol I/O Symbol I/O Input A right source. I

48、nput B right source. Electronic filtering for supply. Input C right source. Reference voltage (0.5Vcc) Not used Output source selector right channel. Input loudness right channel. Input volume 1. right control part. Bass control capacitor right channel Bass control capacitor right channel or output to an external equalizer. Treble control capacitor right channel or input from an external equalizer. Output right front. Output right rear. Supply voltage. Serial clock input. I I - I - - O I I - O I O O - I IAR IBR CAP ICR Vref IDR QSR ILR IVR B1R B2R TR OUTRF OUTRR Vcc SCL FunctionsF