Jvc KS-LX200-R Service Manual

SERVICE MANUAL

CASSETTE RECEIVER

KS-LX200R

E EX

KS-LX200R

Area Suffix

Continental Europe

Central Europe

Contents

Safety precaution 1-2 Disassembly method 1-3 Adjustment method 1-13 Description of major ICs 1-17

9 11 12

KS-LX200R

OFFSEL

This service manual is printed on 100% recycled paper.

No.49573 Oct. 2000

1-1

KS-LX200R

Safety precaution

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.

1-2

KS-LX200R

Disassembly method

Removing the top chassis

(See Fig.1 to 5)

Remove the two screws A attaching the bottom cover to the top chassis on the bottom of the body.

Remove the two screws B attaching the top chassis on both sides of the body.

Remove the screw C and the three screws D attaching the heat sink on the left side of the body.

Remove the two screws E and the screw F on the back of the body.

Remove the two screws G on the upper side of the body.

Move the top chassis upward and disconnect the cassette mechanism connector from the main board connector by pulling it. Remove the top chassis from the body.

Bottom cover

Fig.1

Top chassis

Heat sink

Fig.2

Fig.3

Top chassis

Fig.4Fig.5

1-3

KS-LX200R

Removing the main board assembly

(See Fig.6 to 8)

Prior to performing the following procedure, remove the top chassis.

Remove the screw S attaching the bracket (L).

Disconnect the flexible harness from connector CN701, the card wire from CN702 on the main board and the harness from CN503 and CN504 respectively.

Remove the three screws H attaching the main board assembly to the bottom cover on the upper side of the body.

Remove the screw I attaching the rear panel and the bottom cover on the back of the body. Move the main board in the direction of the arrow and release the two joints a. (At this point, the main board can be removed with the rear panel and the rear heat sink.)

Remove the screw J and the two screws K attaching the rear heat sink on the back of the body.

Main board assembly

CN503

Joint

CN702

Joint

Front panel assembly

Fig.6

CN504

Bracket (L)

CN701

S H

Remove the two screws L and the screw M attaching the rear panel. Now, the main board assembly will be removed.

ATTENTION:

When reassembling, correctly engage the switch S561 and S562 on the main board with the part e of the operation assembly (Refer to Fig.7, 18 and 19).

Main board

S652

Fig.7

Rear heat sink

S651

1-4

Rear panel

Fig.8

KS-LX200R

Removing the front panel assembly

(See Fig.9 to 11)

Prior to performing the following procedure, remove the top chassis assembly.

Disconnect the flexible harness from connector CN701 on the main board assembly.

Remove the four screws N attaching the front panel assembly on both sides of the body. Remove the front panel toward the front.

Front panel assembly

Main board assembly

CN701

Front panel assembly

Fig.9

Front panel assembly

Removing the Front Board (See Fig.12)

Prior to performing the following procedure, remove the top chassis assembly and the front panel assembly.

Remove the four screws O attaching the front board on the back of the front panel assembly and release the eight joints b.

CN701

Fig.10Fig.11

Joints b

Fig.12

1-5

KS-LX200R

Removing the lifter unit (See Fig.13)

Prior to performing the following procedure, remove the top chassis assembly and the front panel assembly.

Disconnect the harness from connector CN503 and CN504 on the main board.

Remove the four screws P and detach the lifter unit from the bottom cover.

Removing the feed motor (L) (See Fig.14)

Prior to performing the following procedure, remove the lifter unit.

Remove the washer attaching the clutch assembly and detach the clutch assembly from the shaft of the lifter unit.

Remove the two screws Q attaching the feed motor (L).

Removing the feed motor (R) (See Fig.15)

Prior to performing the following procedure, remove the lifter unit.

CN503

Clutch assembly

CN504

Lifter unit assembly

Fig.13

Lifter unit assembly

Remove the washer attaching the clutch assembly and detach the clutch assembly from the shaft of the lifter unit.

Remove the two screws R attaching the feed motor (R).

Washer

Clutch assembly

Washer

Feed motor (L) assembly

Fig.14

Lifter unit assembly

Feed motor (R) assembly

Fig.15

1-6

Removing the operation assembly

(See Fig.16 to 19)

Prior to performing the following procedure, remove the top chassis assembly, the front panel assembly and the lifer unit.

Remove the three screws S attaching the right and left brackets which fix gears on both sides of the operation assembly.

Remove the springs 5 and 6 from the operation assembly.

Disconnect the card wire from connector CN702 on the main board and remove the operation assembly.

ATTENTION:

When reassembling, correctly engage the switch S561 and S562 on the main board and the right gear with the part c of the operation assembly.

Bracket (R)

Spring 5

Operation assembly

Fig.16

CN702

KS-LX200R

Bracket (L)

Spring 6

Bracket (R)

Operation assembly

S652

S651

Operation assembly

Fig.17

Operation assembly

S652

S651

Fig.18Fig.19

1-7

KS-LX200R

Removing the operation switch board

(See Fig.20 and 21)

Prior to performing the following procedure, remove the operation assembly.

Remove the six screws T attaching the button panel on the operation assembly.

Pull out the operation switch board from inside of the button panel.

Button panel

Fig.20

Operation switch board

Button panel

Fig.21

Removing the cassette mechanism assembly (See Fig.22)

Prior to performing the following procedure, remove the top chassis.

Remove the four screws U and the cassette mechanism assembly from the top chassis.

U U

CD mechanism assembly

Fig.22

1-8

KS-LX200R

Disassembly method

Removing the head amplifier board

(See Fig.1)

Disconnect the wire from connector CP401 on the head amplifier board.

Remove the screw A.

Remove the head amplifier board in the direction of the arrow to unhook two joints a.

Disconnect connector CP402 on the head amplifier board from the connector board.

Removing the mechanism bracket

(See Fig.2)

Prior to performing the following procedure, remove the head amplifier board.

Connector board

Head amplifier board

Joints

Fig.1

Remove the four screws B on the underside of the cassette mechanism assembly.

Prior to performing the following procedure, remove the head amplifier board and the mechanism bracket.

Removing the connector board

(See Fig.3)

Unsolder soldering b and c on the connector board.

Remove the three screws C.

Remove the connector board in the direction of the arrow to unhook joint d.

Fig.2

Soldering

Mechanism bracket

Joint

Connector board

Fig.3

1-9

KS-LX200R

Removing the load arm assembly

(See Fig.4)

Prior to performing the following procedure, remove the connector board.

Remove the slit washer e retaining the load arm assembly.

Remove the spring g in the load arm assembly marked joint f.

Draw out the load arm assembly from the shaft and rotate in the direction of the arrow to remove it from the cach.

ATTENTION:

The spring g comes off as the load arm assembly is drawn out from the shaft.

Load arm assembly

Holder arm

Cach

Joint

Load arm assembly

Slit washer

Joint

Load arm

assembly

Removing the sub chassis (See Fig.4)

Prior to performing the following procedure, remove the connector board and the load arm assembly.

Remove the two screws D attaching the sub chassis.

Draw out the sub chassis from the holder arm shaft in the direction of the arrow (marked joint h). Remove the sub chassis from the main chassis upwards.

Removing the cassette holder / holder arm (See Fig.5)

Prior to performing the following procedure, remove the connector board and the load arm assembly.

Remove the screw E attaching the cassette holder / holder arm.

Draw out the holder arm shaft from the sub chassis in the direction of the arrow (marked joint h).

Main chassis

Holder arm

Joints

Cassette holder

Fig.4

Joint

Worm gear

Sub chassis

Spring

Disengage two joints i and remove the cassette holder / holder arm.

1-10

Main chassis

Cassette holder

Fig.5

Sub chassis

Removing the sub motor

(See Fig.4 and 6)

Prior to performing the following procedure, remove the connector board and the load arm assembly.

Remove the slit washer j and the worm gear.

Slit washer

KS-LX200R

Remove the two screws F.

Removing the play head / pinch roller assembly (twin set) (See Fig.7)

Prior to performing the following procedure, remove the connector board, the load arm assembly and the sub chassis.

Remove the spring K retaining the play head assembly and pull out the play head assembly.

Sub motor

Pinch roller assembly

Slit washer

Worm gear

Fig.6

Pinch roller assembly

Play head

Slit washer

Remove the two screws G.

Remove the two slit washers l attaching the pinch roller assembly (twin set). Pull out each pinch roller assembly.

Spring

Fig.7

1-11

KS-LX200R

Removing the reel disc assembly (twin set) (See Fig.8 to 10)

Prior to performing the following procedure, remove the connector board, the load arm assembly, the sub chassis and the cassette holder / holder arm.

Remove the two slit washers m while pushing down the reel driver on the two reel disc assemblies.

Pull out the two screws I from the shaft with the reel driver and the spring respectively.

Removing the flywheel assembly (F) and (R) (See Fig.8 and 11)

Prior to performing the following procedure, remove the connector board, the load arm assembly, the sub chassis and the cassette holder / holder arm.

Remove the belt from the underside of the mechanism assembly.

Soldering

Slit washers

Motor

Reel driver

Reel disc assembly

Fig.8

Slit washer

Slit washers

Remove the two slit washers on the upper side of the mechanism assembly.

Pull out the flywheel assembly (F) and (R) from underside of the mechanism assembly.

Removing the reel disc board

(See Fig.11)

From the underside of the mechanism assembly, unsolder soldering o on the reel disc board.

Unbend the joint hook p retaining the reel disc board.

Remove the screw H.

Removing the motor (See Fig.8and 11)

Unsolder soldering q on the motor.

Remove the belt from the underside of the mechanism assembly.

Belt

Spring

Flywheel (F)

Fig.9

Fig.10

Reel driver

Reel disc

Motor

Soldering

Reel disc board

Joint hook

Remove the two screws I from the underside of the mechanism assembly.

1-12

Flywheel (R)

Fig.11

Tab

Reel disc board

Adjustment method

KS-LX200R

Test Instruments reqired for adjustment

1.Digital osclloscope(100MHz)

2.Frequency Counter meter

3.Electric voltmeter

4.Wow & flutter meter

5.Test Tapes VT724 VT739 VT712

For wow flutter & tape speed measurement

VT703

6.Torque gauge

For playback frequency measurement

for DOLBY level measurement

For head azimuth measurement

Cassette type for CTG-N (mechanism adjustment)

Measuring conditions(Amplifier section)

Power supply voltage Load impedance

4 (2Speakers connection)

DC14.4V(10.5~16V)

Line out

Standard volume position Balance and Bass,Treble volume .Fader

20k

Tuner section

BAND STEP FM : 100kHz (Seek), 50kHz (Manual) AM : 9kHz step

Preset Memory Initialization

Preset Memory

Band

FM(MHz) AM(kHz)

87.5 153

89.9 216

97.9 603

105.9 999

108.0 1404

DUMMY LOAD Exclusive dummy load should be used for AM and FM dummy load,there is a loss of 6dB between SSG output and antenna input. The loss of 6dB need not be considered since direct reading of figures are applied in this working standard.

87.5

1620

:Center(Indication"0") Loudness,Dolby NR,Sound,Cruise:Off Volume position is about 2V at speaker output with following conditions.Playback the test tape VT721.

AM mode 999kHz/62dB,INT/400Hz,30% modulation signal on receiving. FM mono mode 97.9MHz/66dB,INT/400Hz,22.5kHz deviation pilot off mono. FM stereo mode 1kHz,67.5kHz dev. pilot7.5kHz dev. Output level 0dB(1 V,50 /open terminal).

Arrangement of Adjusting

Cassette Mechanism Section

Capstan motor

Cassette mechanism (Surface)

Azimuth screw

Playback head

(Forward side)

Azimuth screw (Reverse side)

Tape speed adjust

1-13

KS-LX200R

Arrangment of adjusting

Head amplifier board section (Reverse side)

VR402:Rch (Dolby NR level adj)

VR401:Rch (Dolby NR Frequency response adj)

B402

E Q401

D401

B401

CP401

R420

R423

R421 R422

Q402

B409

Q403

D402

B408

FSMW1101A

VR402

C417

D403

C418

R424

IC402

R425

C419

C414

B403

B410

B404

C410

C412

C411

R413

C415

R416

R415

C416

R418

R419

CP403

C409

R411

B415

C413

B411

IC401

B412

VR401

B416

R412

R410

C405

R408

C407

C408

R417

B413

R404

B406

B414

R409

C406

R414

R407

B405

TPP

C404

CP402

R402

C401

R405

C403

R401

R406

R403

C402

B407

Information for using a Car Stereo service jig (for adjustment and checking)

We are advancing efforts to make our extension cords comman for all Car Stereo products. Please use this type of extension cord as follows. As a U -shape type top cover is employed,this type of extension cord needed to check operation of the mechanism assembly after disassembly. Extension cords

EXT-KSRT002-18P(18 pin extension cord)

For connection between mechanism assembly and main board assembly. Check for mechanism-driving section such as moter ,etc.

Disassembly method. (Refer to mthod to remove main parts)

1.Remove the bottom cover.

2.Remove the front panel assembly.

3.Remove the top cover. (Remove the screws at each side of heat sink and rear panel)

4.Install the front panel (whose assembly was removed in step 2) to the main unit.

5.Confirm that current is being is carried by connecting an extension cord jig. Connection diagram

1-14

EXT-KSRT002-18P

EXTLX001-16PF

EXTLX002-4P

EXTLX002-16PC

EXTLX002-SWPWB

EXTLX001-2P

EXTLX001-6PC

EXTLX001-2P

EXTLX001-6PF

Extension cord list

EXTLX002-JIG : Kit including the following 8 extension parts.

KS-LX200R

No.

1 2 3 4 5 6 7

Parts number Quantity Description EXTLX001-2P EXTLX001-6PF EXTLX001-6PC EXTLX002-16PF EXTLX002-16PC EXTLX002-SWPWB EXTLX002-4P

Besides the above kit, we offer the conventional extension cord for CASSETTE mechanism which are not essential to operation check or service. The mechanism should be directly connected to the board using the extension wire. EXT-KSRT002-18P

2 1 1 1 1 1 1

2Pin, 30cm extension cord 6Pin, 30cm flat wire 6Pin x 2, interlocking connector 16Pin flat wire 16Pin, interlocking connector 3 switch PWB 4Pin, 30cm extension cord

EXTGS004-26P

EXTLX001-16PF

EXTLX002-SWPWB

EXTLX002-4P

EXTLX002-16PC

EXTLX001-2P

EXTLX001-6PC

EXTLX001-2P

EXTLX001-6PF

1-15

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