Jvc-KSF-315-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL CASSETTE RECEIVER No.49623 Feb. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. KS-F315 KS-F315 Area Suffix EE - Russian Federation Contents Safety precaution Disassembly method Adjustment method Description of major ICs 1-2 1-3 1-12 1-16 RadioFans.CN 收音机爱 好者资料库 KS-F315 1-2 ! Burrs

2、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-F315 1-3 Fig. 3 d Front chassis a ee a Disassembly method Detaching the Front Panel Unit ( See Fig

3、.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. Removing the Bottom Cover ( See Fig. 2 to 4 ) 1.Re

4、moving the front chassis. 2.Turn the unit up side down. 3.Insert the six engagements ( b, c, d, e, f ) to the screwdriver . 4.Turn the screwdriver and remove the bottom cover. Fig. 1 Push the release button Front panel unit a a Fig. 2 Top chassis Front chassisBottom cover b c Fig. 4 f Bottom cover R

5、ear panel RadioFans.CN 收音机爱 好者资料库 KS-F315 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 ) retaining the heat sink. Removing the Main Board Assembly ( See Fig. 5 to 7) 1.Removing the front chassis. 2.Removing the bot

6、tom 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 two screws ( 3 ) retaining the rear panel . 6.Separate the main board assembly and cassette mechanism assembly. 7.Take out

7、 the main board assembly. Heat sink Fig. 5 1 1 1 Main board assembly Fig. 6 2 2 ( ) Rear panel Fig. 7 3 3 KS-F315 1-5 Front cover Front panel Operation switch board Fig. 9 Fig. 11 Fig. 10 Front cover iii 5 5 5 5 g h h h g g A Removing the Cassette Mechanism assembly ( See Fig. 8 ) 1.Removing the fro

8、nt 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. Cassette mechanism Front side Top chassis Fig. 8 4 4 4 4 Removing the Operation S

9、witch h board ( See Fig. 9 to 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 dir

10、ection, then disengage the three 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.) KS-F315 1-6 Fig. 14 8 8 8 8 Chassis

11、 assembly 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.Remove the screw ( 6 ) retaining the head ampli- fier board. 7.Shift the two inter

12、 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 the head relay board. Removing the Chassis Assembly ( See Fig. 13 and 14 ) 1.Re

13、moving 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 mechanism. 8.Remove the screw ( 7 ) retaining the relay board. 9.Shift the one

14、 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. Fig. 12 To head relay board Head amplifier board CJ901 6 j j B Fig. 13 Relay boa

15、rd C 7k KS-F315 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 board. Remove the one screw A attaching the direction switch board. 1. 2. Removing the direction switch boa

16、rd (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 and pull forward the FF / REW lever assembly to disengage the joints b, c, d and e. 1. 2. 3. Removing the

17、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 the chassis. 1. 2. Reattaching the FF / REW lever assembly (See Fig.1) C FF / REW lever assembly Joint c

18、Joint b B A Direction switch board Joint d Joint e Soldering a Fig.1 KS-F315 1-8 Prior to performing the following procedure, remove the direction switch board and the FF / REW lever assembly. Remove the screw D attaching the playback head. Remove the C washer and pull out the FF roller. Remove the

19、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 performing the following procedure, remove the direction switch board and the FF / REW lever assembly. Remove

20、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) assembly from the shaft. 1. 2. 3. Removing the pinch-roller (R) and (F) assembly (See Fig.2) The P arm spring (

21、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 Pinch-roller (F) assembly Shaft Shaft S support plate D C washer P arm spring (f)P arm spring (r) Remove t

22、he P arm spring (f) from the chassis. Remove the P arm spring (r) from the chassis. Playback head FF roller Fig.2 KS-F315 1-9 Prior to performing the following procedure, remove the FF / REW lever assembly. From the rear of the unit, bend the two tabs f outwards and disengage the two joints g in the

23、 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 direction of the arrow. Lift the cassette hanger / cassette holder and disengage the joint i of the retu

24、rn 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 remove the main belt and the sub-belt from the motor pulley. 2. Remove the two screws G attaching the motor

25、 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 with a new sub-belt while lifting the reel base assembly slightly. ATTENTION: Prior to performing the fo

26、llowing 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) Replace with a new C washer when reattaching. ATTENTION: The main belt can now be removed.ATTENTION: Cas

27、sette 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 Sub-belt Motor assembly Motor pulley Soldering j Fig.3 Fig.4 Fig.5 C washer C washer Chassis KS-F315 1-10 R

28、aise 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 and the one screw F on the underside of the cassette mechanism assembly. 1. 2. Removing the reel base a

29、ssembly (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 from each shaft of the flywheel (BF) and (BR). Turn over the cassette mechanism assembly and remove the mai

30、n 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. ATTENTION: Selector link (B). Inside of the reel base assembly Reel disc assembly Flywheel (BF) Flywheel

31、 (BR) E E E F G G Main-belt Reel base assembly Sub-belt Motor assembly Motor pulley Soldering j Fig.4 Fig.5 Fig.6Fig.7 C washer C washer Pinch-roller (R) assembly Turn the selector link (B). k KS-F315 1-11 Unsolder the two wires l on the mute switch board on the back of the cassette mechanism assemb

32、ly. 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 wires m on the power switch on the side of the cassette mechanism assembly. Remove the screw I attaching t

33、he power switch. 1. 2. Removing the power switch (See Fig.9) Cassette mechanism assembly Soldering l H Mute switch board Soldering m I Power switch Cassette mechanism assembly Rower switch Motor assembly Fig.8 Fig.9 KS-F315 1-12 Adjustment method Test Instruments reqired for adjustment 1. Digital os

34、cilloscope(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 C

35、TG-N (mechanism adjustment) Measuring conditions(Amplifier section) Power supply voltage. DC14.4V (10.5 - 16V) Load impedance . 4 (4 to 8 allowance) Line out .1.0V / 20k load(250nWb / m) Standard volume position Balance and Bass,Treble volume .Fader :Center(Indication0) Loudness,Dolby NR,Sound,Cruis

36、e:Off Volume position is about 2V at speaker output with following conditions.Playback the test tape VT721. AM mode999kHz/62dB,INT/400Hz,30% modulation signal on receiving. FM mono mode97.9MHz/66dB,INT/400Hz,22.5kHz deviation pilot off mono FM stereo mode 1kHz,67.5kHz dev. pilot7.5kHz dev. Output le

37、vel0dB(1 V,50 /open terminal) Frequency Band FM1/FM2 FM3 87.5-108MHz 65-74MHz Band AM MW522-1620KHz LW144-279KHz KS-F315 1-13 Arrangement of adjusting & Test points Head section view Cassette mechanism (Surface) Tape speed adjust Motor assembly Playback head Azimuth screw Head azimuth screwFixed scr

38、ew Height adjusting screw c Height adjusting screw b Height adjusting screw a Playback head KS-F315 1-14 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

39、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 mechanism assembly after disassembly. 3.Extension cord : EXTKSRT002-6P ( 6 pin extensio

40、n 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. 3.Remove the top cover . 4.Install the front panel. 5.Confirm that current is being car

41、ried by connecting an extension cord jig. Note Available to connect to the CN701 connector when in- stalling the front panel. KS-F315 1-15 Mechanism adjustment section ItemAdjusting & Confirmation MethodsAdjustStd. Value Head Height Adjustment Note Adjust the azimuth directly. When you adjust the he

42、ight 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 adjustment screw (a) and azimuth adjustment screw (b) so that line A of the mirror tape r

43、uns 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 again and check. 3.Adjust the azimuth screw (b) so that line B of the mirror tape runs i

44、n 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 test tape ( VT703: 10kHz ) and play it back in the forward play mode. Adjust the Rch and

45、Lch output levels to maximum, 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 screw (c). *The phase difference should be 45 or more. 4.When switching between forward

46、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 should be within 1.5dB. 1.Check to see if the reading of the frequency counter & Wow flutte

47、r 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 the volume position at 2V. 2.Play the test tape ( VT739 )back and confirm 0 + 3dB at1kH

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

49、 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-F315 1-16 LC72362N-9997 (IC701) : System Controller 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 41 42 43 44 45 46 47 48 49 50 51 52 5