Jvc-KSFX-200-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CASSETTE RECEIVER No.49575 Nov. 2000 COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD. KS-FX200 KS-FX200 Area Suffix J - Northern America Contents Safety precaution Disassembly method Adjustment Method Description of major ICs 1-2 1-3 1-12 1-16 This service manual is printed on 100% recycl

2、ed paper. KS-FX200KS-FX200 RadioFans.CN 收音机爱 好者资料库 KS-FX200 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 KS-FX200 1-3 Fig. 3 Disassemb

3、ly Method Detaching the Front Panel Unit ( See Fig.1 ) Push the Release button in the direction of arrow to detach the front panel unit. Removing the Front Chassis ( See Fig. 2 and 3 ) Disengage the four tabs ( a ) in the right and left sides of unit and pull the front chassis forward to remove it.

4、Removing the Bottom Cover ( See Fig. 2 to 4 ) 1.Removing the front chassis. 2.Turn the unit up side down. 3.Insert the four engagements ( b, c, d, e ) to the screwdriver . 4.Turn the screwdriver and remove the bottom cover. Fig. 2 Fig. 4 Front panel unit Fig. 1 Push the release button Front chassis

5、Bottom cover Top chassis Bottom cover a a bc a Front chassisd Bottom cover Rear panel e RadioFans.CN 收音机爱 好者资料库 KS-FX200 1-4 Removing the Heat Sink ( See Fig. 5 ) 1.Removing the front chassis. 2.Removing the bottom cover. 3.Remove the three screws ( 1 and 1 ) retaining the heat sink. Removing the Ma

6、in Board Assembly ( See Fig. 5 to 7) 1.Removing the front chassis. 2.Removing the bottom cover. 3.Removing the heat sink. Attach the heat sink with a screw ( 1 ) on operat- ing checks. 4.Remove the two screws ( 2 ) retaining the main board assembly. 5.Remove the six screws ( 3 ) and one screw ( 3 )

7、retaining 6.Separate the main board assembly and cassette mechanism assembly. 7.Take out the main board assembly. Fig. 5 Fig. 6 Fig. 7 ( ) the rear panel. Heat sink 11 1 2 2 Main board assembly Rear panel 3 3 3 3 KS-FX200 1-5 Fig. 9 Fig. 11 Fig. 10 Removing the Cassette Mechanism assembly ( See Fig.

8、 8 ) 1.Removing the front chassis. 2.Removing the bottom cover. 3.Removing the heat sink. 4.Removing the main board assembly. 5.Remove the four screws ( 4 ) retaining the cassette mechanism. 6.Separate the top chassis and cassette mechanism. Fig. 8 Removing the Operation Switch board ( See Fig. 9 to

9、 11) 1.Detaching the front panel unit. 2.Turn the front panel back side down. 3.Remove the four screws ( 5 ) retaining the front cover. 4.Open the front cover gradually by disengaging the three engagements ( g ) while pushing the top of the front cover in the arrow A direction, then disengage the th

10、ree engagements ( h ) on the both sides. 5.Place the front panel unit front side down. 6.Disengage the three engagements ( i ) on the bottom to separate the front cover from the front panel. (Be careful not to lose the button springs.) Front side Cassette mechanism Top chassis 44 44 g gg Front cover

11、 A 5 5 5 5 hh h Front cover Front panel iii Operation switch board KS-FX200 1-6 Fig. 14 Removing the Head Amplifier Board ( See Fig. 12 ) 1.Removing the front chassis. 2.Removing the bottom cover. 3.Removing the heat sink. 4.Removing the main board assembly. 5.Removing the cassette mechanism. 6.Remo

12、ve the screw ( 6 ) retaining the head ampli- fier board. 7.Shift the two inter rocking sections ( j ) securing the head amplifier board in the direction shown by the arrow B to remove the printed circuit board. 8.From the connector CJ901 on the head amplifier board from connector wire out going to t

13、he head relay board. Removing the Chassis Assembly ( See Fig. 13 and 14 ) 1.Removing the front chassis. 2.Removing the bottom cover. 3.Removing the heat sink. 4.Removing the main board assembly. 5.Removing the cassette mechanism. 6.Removing the head amplifier board. 7.Turn the left side to cassette

14、mechanism. 8.Remove the screw ( 7 ) retaining the relay board. 9.Shift the one inter rocking sections ( k ) securing the relay board in the direction shown by the arrow C to remove the printed circuit board. 10. Turn the back side down, remove the four screws ( 8 ) retaining the chassis assembly. Fi

15、g. 12 Fig. 13 B To head relay board CJ901 Head amplifier board j j 6 Relay board k C 7 Chassis assembly 8 8 8 8 KS-FX200 1-7 Prior to performing the following procedures, remove the head amplifier board, the relay board and the mechanism bracket. Unsolder the three wires a on the direction switch bo

16、ard. Remove the one screw A attaching the direction switch board. 1. 2. Removing the direction switch board (See Fig.1) Remove the screw B attaching the FF / REW lever assembly on the back of the cassette mechanism assembly. Remove the screw C on the upper side of the FF / REW lever assembly. Lift a

17、nd pull forward the FF / REW lever assembly to disengage the joints b, c, d and e. 1. 2. 3. Removing the FF / REW lever assembly (See Fig.1) Reattach the FF / REW lever assembly to the joint c on the back of the chassis. Reattach the pinch-roller shaft e, the change lever d and the return link e to

18、the chassis. 1. 2. Reattaching the FF / REW lever assembly (See Fig.1) C FF / REW lever assembly Joint c Joint b B A Direction switch board Joint d Joint e Solding a Fig.1 KS-FX200 1-8 Prior to performing the following procedure, remove the direction switch board and the FF / REW lever assembly. Rem

19、ove the screw D attaching the playback head. Remove the C washer and pull out the FF roller. Remove the S support plate, the A arm spring (a) and (b), the playback head. 1. 2. 3. Removing the playback head (See Fig.2) The A arm spring (a) differs from the A arm spring (b). ATTENTION: Prior to perfor

20、ming the following procedure, remove the direction switch board and the FF / REW lever assembly. Remove the P arm spring (f) in the pinch-roller (F) assembly from the chassis. Remove the P arm spring (r) in the pinch-roller (R) assembly from the chassis. Draw out the pinch roller (F) and (R) assembl

21、y from the shaft. 1. 2. 3. Removing the pinch-roller (R) and (F) assembly (See Fig.2) The P arm spring (f) differs from the P arm spring (r). ATTENTION: The pinch roller (F) assembly differs from the pinch roller (R) assembly. ATTENTION: A arm spring (b) A arm spring (a) Pinch-roller (R) assembly Pi

22、nch-roller (F) assembly Shaft Shaft S support plate D C washer P arm spring (f)P arm spring (r) Remove the P arm spring (f) from the chassis. Remove the P arm spring (r) from the chassis. Playback head FF roller Fig.2 KS-FX200 1-9 Prior to performing the following procedure, remove the FF / REW leve

23、r assembly. From the rear of the unit, bend the two tabs f outwards and disengage the two joints g in the direction of the arrow. Push the eject lever and remove the cassette holder from the playback head. Disengage the two joints h of the cassette hanger / cassette holder and the eject lever in the

24、 direction of the arrow. Lift the cassette hanger / cassette holder and disengage the joint i of the return link and the eject lever. 1. 2. 3. Removing the cassette hanger / cassette holder (See Fig.3) Unsolder the two wires j on the motor assembly.1. Turn over the cassette mechanism assembly and re

25、move the main belt and the sub-belt from the motor pulley. 2. Remove the two screws G attaching the motor assembly. 3. Removing the motor assembly (See Fig.5) To replace the sub-belt, remove the main belt and the sub-belt from the motor pulley. Then remove the three screws E and one screw F. Replace

26、 with a new sub-belt while lifting the reel base assembly slightly. ATTENTION: Prior to performing the following procedure, remove the FF / REW lever assembly and the cassette hanger / cassette holder. Remove the C washer and pull out reel disc assembly.1. Removing the reel disc assembly (See Fig.4)

27、 Replace with a new C washer when reattaching. ATTENTION: The main belt can now be removed.ATTENTION: Cassette holder Cassette hanger Return link Joint i Eject lever Joint h Joint h Joint g Joint g Tab f Tab f Reel disc assembly Flywheel (BF) Flywheel (BR) E E E F G G Main-belt Reel base assembly Su

28、b-belt Motor assembly Motor pulley Solding j Fig.3 Fig.4 Fig.5 C washer C washer Chassis KS-FX200 1-10 Raise the part k of the reel base assembly slightly and remove the selector link (B) on the front side of the cassette mechanism assembly by turning it as shown in Fig.10. Remove the three screws E

29、 and the one screw F on the underside of the cassette mechanism assembly. 1. 2. Removing the reel base assembly (See Fig.5 and 6) Prior to performing the following procedure, remove the cassette hanger / cassette holder. From the upper side of the cassette mechanism assembly, remove the C washer fro

30、m each shaft of the flywheel (BF) and (BR). Turn over the cassette mechanism assembly and remove the main belt. Pull out the flywheel (BF) and (BR) downward respectively. 1. 2. Removing the Flywheel (BF) and (BR) assembly (See Fig.4 and 5) The reel base assembly is not repairable. Handle with care.

31、ATTENTION: Selector link (B). Inside of the reel base assembly Reel disc assembly Flywheel (BF) Flywheel (BR) E E E F G G Main-belt Reel base assembly Sub-belt Motor assembly Motor pulley Solding j Fig.4 Fig.5 Fig.6Fig.7 C washer C washer Pinch-roller (R) assembly Turn the selector link (B). k KS-FX

32、200 1-11 Unsolder the two wires l on the mute switch board on the back of the cassette mechanism assembly. Remove the screw H attaching the mute switch board. 1. 2. Removing the mute switch board (See Fig.8) Prior to performing the following procedure, remove the motor assembly. Unsolder the two wir

33、es m on the power switch on the side of the cassette mechanism assembly. Remove the screw I attaching the power switch. 1. 2. Removing the power switch (See Fig.9) Cassette mechanism assembly Solding l H Mute switch board Solding m I Rower switch Cassette mechanism assembly Rower switch Motor assemb

34、ly Fig.8 Fig.9 KS-FX200 1-12 Adjustment Method Test Instruments reqired for adjustment 1. Digital 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 flutte

35、r & 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) Line out. 20k Standard volume position Balance a

36、nd 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 mode1,000kHz/62dB,INT/400Hz,30% modulation signal on recieving. FM mono mode97.9MHz/66dB,INT/400Hz,22.5kHz dev

37、iation pilot off mono FM stereo mode 1kHz,67.5kHz dev. pilot7.5kHz dev. Output level0dB(1 V,50 /open terminal) Frequency Band MODELKS-FX200 Band FM87.5-107.9MHz 200KHz step AM530-1710KHz 10KHz step KS-FX200 1-13 Playback head Head azimuth screw Fixed screw Height adjusting screw c Height adjusting s

38、crew 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-FX200 1-14 Extension cord : EXTKSRT002-6P EXTKSRT002-6P Front panel assembly Main board Cassette mechanism Information

39、 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 follows. 2.As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the

40、 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 driving section such as motor ,etc. Disassembly Method 1.Remove the bottom cover. 2.Remove the front panel assembly.

41、 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- stalling the front panel. KS-FX200 1-15 Mechanism Adjustment Section ItemAdjusting & Confirmation MethodsAdjustS

42、td. 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 the cassette housing, perform the azimuth adjustment. 1.load the mirror tape ( SCC-1659 ). Adjust with height

43、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 to REV, check that the head position set in procedure 1 is not changed. *If the position has shifted, adjust

44、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 tape ( VT724: 1kHz ) and play it back in the reverse play mode. set the Rch output level to maximum. 2.Load the t

45、est 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 should be within 45 . 3.Engage the reverse mode and adjust the output level to maximum, with azimuth adjustment s

46、crew (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 Lch and Rch. 5.When the test tape ( VT721 : 315Hz ) is played back, the level difference between channels sho

47、uld 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 specification, adjust the motor with a built- in volume resistor. 1.Play the test tape ( VT724 : 1kHz ) back and set

48、 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 adjust the azimuth. Head shield Head shield The head is at low position during FWD. The head is at height posi

49、tion 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) Speaker out 1kHz/8kHz : 0dB_3dB, 125Hz/1kHz : -4dB+2dB, 1.Head azimuth 2.Tape Speed and Wow & Flutter 3.Playback Frequency response KS-FX200 1-16 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