JVC KS-FX850R Manuel utilisateur
SERVICE MANUAL
CASSETTE RECEIVER
No.49549
Feb. 2000
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
This service manual is made from 100% recycled paper.
Printed in Japan
200002(V)
VICTOR COMPANY OF JAPAN, LIMITED
MOBILE ELECTRONICS DIVISION,10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan
KS-FX850R
KS-FX820R
KS-FX835R
(No.49549)
KS-FX850R/KS-FX820R/KS-FX835RKS-FX850R/KS-FX820R/KS-FX835R
Area Suffix
E ---- Continental Europe
Contents
Safety precaution 1-2
Instructions 1-3~18
Disassembly method 2-1
Adjustment method 2-8
Description of major ICs 2-12
Block diagram 2-21
Standard schematic diagrams 2-22
Printed circuit board 2-25
Parts list 3-1~17
40Wx4
TP
DISP
RPT
SSM
SCM
MO
RND
7 8 9101112
PTY
CD-CH FM/AM TAPE
/I
ATT
/
DOLBY B NR
5
°
DAB
RDS
40Wx4
TP
DISP
RPT
SSM
SCM
MO
RND
7 8 9101112
PTY
CD-CH FM/AM TAPE
/I
ATT
/
DOLBY B NR
5
°
DAB
RDS
40Wx4
TP
DISP
RPT
SSM
SCM
MO
RND
7 8 9 10 11 12
PTY
CD-CH FM/AM TAPE
/I
ATT
/
DOLBY B NR
5
°
DAB
RDS
KS-FX820R
KS-FX835R
KS-FX850R
KS-FX850R
KS-FX835R
KS-FX820R
Illumination
Color
Blue & Red
White
Remote controller
!CAUTION 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
KS-FX850R/KS-FX835R/KS-FX820R
2-1
Disassembly method
Removing the front panel unit (See Fig.1)
1.
2.
Remove the two screws Aattaching the front
chassis.
Insert a screwdriver to the two joints aon the side
of the front chassis, two joints bon the right side
and one joint cfrom upside, then detach the front
chassis toward the front side.
1. Press the release switch and remove the front
panel unit in the direction of the arrow.
Removing the front chassis (See Fig.2~3)
Removing the heat sink (See Fig.4)
1. Remove the three screws Battaching 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
Fig. 4
Front chassis
KS-FX850R/KS-FX835R/KS-FX820R
2-2
Removing the bottom cover
(See Fig.5)
1.
2.
Turn the body upside down.
Insert a screwdriver to the two joints dand two
joints eon both sides of the body and the joint fon
the back of the body, then detach the bottom cover
from the body.
Removing the rear panel
(See Fig.6 )
1.
2.
3.
4.
Remoe the front chassis.
Remove the heat sink.
Remove the bottom cover.
Remove the five screws Battaching the rear panel
and one screw Cattaching the pine jack on the
back of the body.
Removing the main amplifier board
assembly
(See Fig.7)
1.
2.
3.
4.
5.
Remove the front chassis.
Remove the bottom cover.
Remove the rear panel.
Remove the two screws Dattaching 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. 5
Fig. 6
Fig. 7
B
C
B
B
D
D
CP701
Main board assembly
KS-FX850R/KS-FX835R/KS-FX820R
2-3
Cassette mechanism assembly
F
FF
Top cover
Fig. 8
GG
GG
Fig. 9
Fig. 10
LCD & Key control board
F
Removing the Cassette mechanism
assembly (See Fig.8)
1.
2.
3.
4.
Remove the front chassis.
Remove the bottom cover.
Remove the main amplifier board assembly.
Remove the fore screws Fattaching the cassette
mechanism assembly from the top cover.
Removing the control switch board
(See Fig.9 and 10 )
1.
2.
3.
Remove the front panel unit from the main body.
Remove the five screws Gattaching the rear cover
on the back of the front panel unit.
Remove the control switch board from the front
panel unit.
KS-FX850R/KS-FX835R/KS-FX820R
2-4
For the 6pin harness extending from connector
CN402 on the mecha control P.W.B, disconnect it
from the head relay P.W.B.
Disconnect the card wire from connector CN403 on
the mecha control P.W.B.
Remove the screw A attaching the mecha control
P.W.B.
Move the tab a as shown in Fig.2 and remove the
mecha control P.W.B. while moving it in the direction
of the arrow.
1.
2.
3.
4.
<Removal of the cassette mechanism>
Removing the mecha control P.W.B.
(See Fig.1 and 2)
Disconnect the 6pin harness from connector CN402
and the card wire from CN403 on the mecha control
P.W.B. (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 ass’y
Head relay
P.W.B.
6pin
harness
CN402 CN403
CN402
Mecha control P.W.B.
Fig.2
Tab a
Mecha control P.W.B.
Fig.3
Cassette mechanism ass’y
B
B
A
Mecha control P.W.B.
CN403
KS-FX850R/KS-FX835R/KS-FX820R
2-5
Unsolder the soldering b on the head relay P.W.B.
Remove the screw C attaching the head relay P.W.B.
Remove the head relay P.W.B. in the direction of the
arrow while releasing the two joints c.
1.
2.
3.
Removing the head relay P.W.B.
(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 cach.
1.
2.
Removing the load arm (See Fig.5)
Prior to performing the following procedure, remove
the head relay P.W.B.
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 relay P.W.B., 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. Move 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.4
CSoldering b Joint c
Fig.6
Tab f
D
Tab e
Cach
Head relay P.W.B.
Head relay P.W.B.
Fig.7
Reinforce bracket
Reinforce
bracket
E
Cassette holder
Sub chassis
Head relay
P.W.B.
Joint h
Holder arm
Load arm
Joint h
tab g
Fig.5
Spring d
Load arm E washer
Cassette mecha chassis
KS-FX850R/KS-FX835R/KS-FX820R
2-6
Prior to performing the following procedure, remove
the head relay P.W.B.and the sub chassis.
Remove the two screws F attaching 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 P.W.B.and the sub chassis.
Push each tab i in the direction of the arrow and pull
out the pinch rollers on both sides.
*
1.
Removing the pinch roller ass’y
(See Fig.9)
Unsolder the soldering j on the reel disc P.W.B.
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 P.W.B.
(See Fig.10)
Unsolder the two soldering l of the motor and the sub
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 detached 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 ass’y Pinch roller ass’y
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 ass’y
Tab i Tab i
Tab i
Fig.10
Cassette mechanism ass’y
Tabs k
Reel disc P.W.B.
Soldering j
Tabs k
G
G
Motor Belt
Flyhwheel
KS-FX850R/KS-FX835R/KS-FX820R
2-7
Prior to performing the following procedure, remove
the head relay P.W.B, the load arm, the sub chassis,
the cassette holder, the holder arm and the reel disc
P.W.B.
Remove the belt on the bottom of the cassette
mechanism ass’y.
Remove the slit washer attaching the flywheel on the
upper side of the cassette mechanism ass’y 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 procedure, remove
the head relay P.W.B, 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 spring and the reel table.
*
1.
2.
Removing the reel disc ass’y( )
(See Fig.12 to 14)
When reassembling, make sure to use
a new slit washer.
ATTENTION:
Fig.10
Cassette mechanism ass’y
Tab k
Reel disc P.W.B.
Soldering j
Tab k
G
G
Motor Belt
Flyhwheel
Fig.12
Plate
The part n
Reel driver
Reel disc ass’y( )
Push aside
the gear
Tabs o
Reel disc
ass’y( )
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
KS-FX850R/KS-FX835R/KS-FX820R
2-8
Adjustment method
Test instruments required for adjustment
1. Digital oscilloscope(100MHz)
2. Frequency Counter meter
3. Electric voltmeter
4. Wow & flutter meter
5.TestTapes
VT724
.......................
...................
For DOLBY level measurement
VT739............For playback frequency measurement
VT712....For wow flutter & tape speed measurement
VT703..................... For head azimuth measurement
6.Torquegauge .................... Cassette type for CTG-N
(mechanism adjustment)
Measuring conditions(Amplifier section)
Power supply voltage.............. DC14.4V (10.5 - 16V)
Loadimpedance ........... 4 (2Speakers connection)
Line out............................................................ 20k
Standard volume position
Balance and Bass,Treble volume .Fader
:Center(Indication"0")
Loudness,Dolby NR,Sound,Cruise:Off
following conditions. Playback the test tape VT721.
AM mode 999kHz/62dB,INT/400Hz,30%
modulation signal on receiving.
FM mono mode 97.5MHz/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)
MC-109C For TAPA CURL confirmation
(without Padd type)
Autres manuels pour KS-FX850R
2
Ce manuel convient aux modèles suivants
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