JVC KS-F383R User manual

SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. No.49813
2003/03
KS-F383R,KS-F380R
CASSETTE RECEIVER
49813200302 KS-F383R,KS-F380R
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Area Suffix
E ---- Continental Europe
EX -------- Central Europe
SEL
LO UD
D ISP
SS M
S C MM O
TP
PTY
A M
F M
Model
KS-F383R
KS-F380R
Illumination color
Amber
Green

KS-F383R,KS-F380R
1-2 (No.49813)
SECTION 1
Important Safety Precautions
1.1 Safety Precautions
!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.

KS-F383R,KS-F380R
(No.49813)1-3
SECTION 2
Disassembly method
2.1 Main body
2.1.1 Removing the front panel assembly
(See Fig.1)
(1) Press the release button and remove the front panel as-
sembly.
Fig.1
2.1.2 Removing the bottom cover
(See Fig.2)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Turn the body upside down.
(2) Insert a screwdriver under the joints to release the two
joints aon the left side, the two joints bon the right side and
the joint con the back of the body, then remove the bottom
cover from the body.
CAUTION:
When releasing the joint c using a screwdriver, do not
damage the main board.
Fig.2
2.1.3 Removing the front chassis
(See Fig.3)
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover.
(1) Remove the screw Aon each side of the body.
(2) Release the two joints dand two joints eon the sides, then
remove the front chassis toward the front.
Fig.3
Front panel assembly
Release button
Bottom cover
Joint b
Joint b
Joint c
Joint a
Joint a
Joint d
Front chassis
A
Joint e
Joint d Joint e

KS-F383R,KS-F380R
1-4 (No.49813)
2.1.4 Removing the heat sink
(See Fig.4)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws Band two screws Cattaching the
heat sink on the left side of the body, and remove the heat
sink.
Fig.4
2.1.5 Removing the rear panel
(See Fig.5 )
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover.
(1) Remove the two screws D, screws Eand screw Fattaching
the rear panel on the back of the body.
Fig.5
2.1.6 Removing the main board
(See Fig.6)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink and
rear panel.
(1) Remove the two screws Gattaching the main board on the
top chassis.
(2) Disconnect the two connectors CN901 and CN902 on the
main board from the cassette mechanism assembly.
Fig.6
Heat sink
CB C
FD
D
E
Rear panel
GG
Main board
CN901
CN902

KS-F383R,KS-F380R
(No.49813)1-5
2.1.7 Removing the cassette mechanism assembly
(See Fig.7)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel and main board.
(1) Remove the four screws Hattaching the cassette mecha-
nism assembly on the top chassis.
Fig.7
2.1.8 Removing the head amplifier board
(See Fig.8)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board and cassette mechanism assembly.
(1) Disconnect the wire from CJ901 on the head amplifier
board.
(2) Remove the screw Jattaching the head amplifier board.
(3) Move the head amplifier board in the direction of the arrow
to release the two joints f, the head amplifier board can be
removed.
Fig.8
HH
HH
Top chassis
Cassette mechanism assembly
Joint f
J
CJ901
Head amplifier board
To head relay board
Joint f

KS-F383R,KS-F380R
1-6 (No.49813)
2.1.9 Removing the relay board
(See Fig.9)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board and cassette mechanism assembly.
(1) Disconnect the wire from CP722 on the relay board.
(2) Remove the screw Kattaching the relay board.
(3) Move the relay board in the direction of the arrow to release
the joint g, the relay board can be removed.
Fig.9
2.1.10 Removing the mecha bracket
(See Fig.10)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board, cassette mechanism assembly, head am-
plifier board and relay board.
(1) Remove the four screws Lattaching the mecha bracket.
Fig.10
Joint g
K
CP722
Relay board
Mecha bracket
L
L
L
L

KS-F383R,KS-F380R
(No.49813)1-7
2.1.11 Removing the switch (LCD & key) board
(See Fig.11~13)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the four screws Mattaching the rear cover on the
back of the front panel assembly.
(2) Release the eleven joints h, the front panel and the rear
cover become separate.
(3) Remove the switch board from the rear cover.
Fig.11
Fig.12
Fig.13
M
M M
M
Joint h
Joint hJoint h
Joint h
Switch (LCD & Key) board

KS-F383R,KS-F380R
1-8 (No.49813)
2.2 Cassette mechanism assembly
• Prior to performing the following procedures, remove the head
amplifier board, the relay board and the mechanism bracket.
2.2.1 Removing the direction switch board
(See Fig.1)
(1) Unsolder the three wires aon the direction switch board.
(2) Remove the one screw Aattaching the direction switch
board.
2.2.2 Removing the FF / REW lever assembly
(See Fig.1)
(1) Remove the screw Battaching the FF / REW lever assem-
bly on the back of the cassette mechanism assembly.
(2) Remove the screw Con the upper side of the FF / REW
lever assembly.
(3) Lift and pull forward the FF / REW lever assembly to disen-
gage the joints b, c, dand e.
2.2.3 Reattaching the FF / REW lever assembly
(See Fig.1)
(1) Reattach the FF / REW lever assembly to the joint con the
back of the chassis.
(2) Reattach the pinch-roller shaft e, the change lever dand
the return link eto the chassis.
Fig.1
2.2.4 Removing the playback head
(See Fig.2)
• Prior to performing the following procedure, remove the direc-
tion switch board and the FF / REW lever assembly.
(1) Remove the screw Dattaching the playback head.
(2) Remove the Cwasher and pull out the FF roller.
(3) Remove the Ssupport plate, the A arm spring (a) and (b),
the playback head.
ATTENTION:
The A arm spring (a) differs from the A arm spring (b).
2.2.5 Removing the pinch-roller (R) and (F) assembly
(See Fig.2)
• Prior to performing the following procedure, remove the direc-
tion switch board and the FF / REW lever assembly.
(1) Remove the P arm spring (f) in the pinch-roller (F) assem-
bly from the chassis.
(2) Remove the P arm spring (r) in the pinch-roller (R) assem-
bly from the chassis.
(3) Draw out the pinch roller (F) and (R) assembly from the
shaft.
ATTENTION:
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.
Fig.2
C
FF / REW lever assembly
Joint c
Joint b
B
A
Direction switch board
Joint d
Joint e
Soldering a
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 the P arm spring (f)
from the chassis.
Remove the P arm spring (r)
from the chassis.
Playback head
FF roller

KS-F383R,KS-F380R
(No.49813)1-9
2.2.6 Removing the cassette hanger / cassette holder
(See Fig.3)
• Prior to performing the following procedure, remove the FF /
REW lever assembly.
(1) From the rear of the unit, bend the two tabs foutwards and
disengage the two joints gin the direction of the arrow.
(2) Push the eject lever and remove the cassette holder from
the playback head. Disengage the two joints hof the cas-
sette hanger / cassette holder and the eject lever in the di-
rection of the arrow.
(3) Lift the cassette hanger / cassette holder and disengage
the joint i of the return link and the eject lever.
Fig.3
2.2.7 Removing the reel disc assembly
(See Fig.4)
• Prior to performing the following procedure, remove the FF /
REW lever assembly and the cassette hanger / cassette hold-
er.
(1) Remove the C washer and pull out reel disc assembly.
ATTENTION:
Replace with a new C washer when reattaching.
Fig.4
2.2.8 Removing the motor assembly
(See Fig.5)
(1) Unsolder the two wires jon the motor assembly.
(2) Turn over the cassette mechanism assembly and remove
the main belt and the sub-belt from the motor pulley.
ATTENTION:
The main belt can now be removed.
(3) Remove the two screws Gattaching the motor assembly.
Fig.5
Cassette holder
Cassette hanger
Return link
Joint i
Eject lever
Joint h
Joint h
Joint g
Joint g Tab f
Tab f
Chassis
Reel disc assembly
C washer
C washer
Flywheel (BF)
Flywheel (BR)
E
E
E
F
G
G
Main-belt
Reel base assembly
Sub-belt
Motor assembly
Motor pulley
Soldering j

KS-F383R,KS-F380R
1-10 (No.49813)
2.2.9 Removing the Flywheel (BF) and (BR) assembly
(See Fig.4 and 5)
• Prior to performing the following procedure, remove the cas-
sette hanger / cassette holder.
(1) From the upper side of the cassette mechanism assembly,
remove the C washer from each shaft of the flywheel (BF)
and (BR).
(2) Turn over the cassette mechanism assembly and remove
the main belt. Pull out the flywheel (BF) and (BR) down-
ward respectively.
Fig.4
Fig.5
2.2.10 Removing the reel base assembly
(See Fig.5 and 6)
(1) Raise the part kof the reel base assembly slightly and re-
move the selector link (B) on the front side of the cassette
mechanism assembly by turning it as shown in Fig.6.
(2) Remove the three screws Eand the one screw Fon the
underside of the cassette mechanism assembly.
ATTENTION:
The reel base assembly is not repairable. Handle with care.
Fig.6
Fig.7
Reel disc assembly
C washer
C washer
Flywheel (BF)
Flywheel (BR)
E
E
E
F
G
G
Main-belt
Reel base assembly
Sub-belt
Motor assembly
Motor pulley
Soldering j
Selector link (B).
Pinch-roller (R) assembly
Turn the selector link (B).
k
Inside of the reel base assembly

KS-F383R,KS-F380R
(No.49813)1-11
2.2.11 Removing the mute switch board
(See Fig.8)
(1) Unsolder the two wires lon the mute switch board on the
back of the cassette mechanism assembly.
(2) Remove the screw Hattaching the mute switch board.
Fig.8
2.2.12 Removing the power switch
(See Fig.9)
• Prior to performing the following procedure, remove the motor
assembly.
(1) Unsolder the two wires mon the power switch on the side
of the cassette mechanism assembly.
(2) Remove the screw Iattaching the power switch.
Fig.9
Cassette mechanism assembly
Soldering l
HMute switch board
Rower switch
Motor assembly
Soldering m
IPower switch
Cassette mechanism assembly

KS-F383R,KS-F380R
1-12 (No.49813)
SECTION 3
Adjustment method
AM mode 999kHz/62dB, INT/400Hz,30%
modulation signal on recieving.
FM mono mode 97.9MHz/66dB, INT/400Hz,
22.5kHz deviation pilot off mono
FM stereo mode 1kHz, 67.5kHz dev.pilot 7.5kHz dev
Output level 0dB(1 V,50 /open terminal)
Band
Test instruments reqired for adjustment Standard volume position
Measuring conditions(Amplifier section)
Frequency band
1. Digital oscilloscoe(100MHz)
2. Frequency counter meter
3. Electric voltmeter
4. Wow & flutter meter
5. Test tapes
6. Torque gauge...................Cassette type for CTG-N
(Mechanism adjustment)
VT724.......................for DOLBY level measurement
VT739............For playback frequency measurement
VT712....For wow flutter & tape speed measurement
VT703.....................For head azimuth measurement
Balance and Bass, Treble volume, Fader
: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.
Power supply voltage.............. DC14.4V(11V - 16V allowance)
Load impedance............ 4 (4 to 8 allowance)
Line out level/Impedance..............1.0V/20k load (250 nWb/m)
FM: 87.5 MHz to 108.0 MHz
AM : (MW) 522 kHz to 1620 kHz
(LW) 144 kHz to 279 kHz

KS-F383R,KS-F380R
(No.49813)1-13
Information for using a car audio service jig
Disassembly method
1. Remove the front panel assembly.
2. Remove the bottom cover.
3. Remove the front chassis.
4. Remove the two screws D of the rear panel. (Refer to Disassembly method.)
5. Remove the heat sink.
6. Reattach the heat sink with two screws B. (Refer to Disassembly method.)
7. Install the front chassis and front panel assmbly.
8. Confirm that current is being carried by connecting an extension cord jig.
Note
Available to connect to the CJ701 connector when installing the front panel.
CAUTION :
Be sure to attach a heat sink on the power amplifier IC of a main board when supplying the power.
If voltage is applied without attaching the heat sink, the power amplifier IC will be destroyed by heat.
1. For 1995 and 1996, we're 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
mechanism assembly after disassembly.
3. Extension cord : EXTKSRT002-6P ( 6 pin extension cord ) For connection between mechanism assembly
and main board.
4. Check for mechanism driving section such as motor ,etc..
EXTKSRT002-6P
Extension cord
: EXTKSRT002-6P
Front panel assembly
Main board
Cassette mechanism

KS-F383R,KS-F380R
1-14 (No.49813)
Head section view
Head azimuth screw
Cassette mechanism
(Surface)
Tape speed adjust
Motor assembly
Fixed screw
Height adjusting screw
c
Height adjusting screw
b
Height adjusting screw
a
Playback head
Playback head
Azimuth screw
Arrangement of adjusting & test points

KS-F383R,KS-F380R
(No.49813)1-15
Mechanism adjustment section
Item Adjusting & Confirmation Methods Adjust Std. Value
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 screw
045
"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
adjustment screw (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 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 test tape (VT703: 10kHz) and play it back in the
forward play mode. Adjust the Rch and 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 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
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 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
readjust the azimuth.
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-F383R,KS-F380R
1-16 (No.49813)
SECTION 4
Description of major ICs
4.1 AN80T05LF (IC961) : Regulator
• Pin layout & Block diagram
• Pin function
Pin No. Symbol Function
1 ILL 10V power supply for illumination.
2 MODE2 When 5V is input, becomes AM. and the antenna output is turned on.
3 MODE1 When 5V is input, becomes AM. and the output of FM is switched.
4 STB When 5V is input, outputs to ILL, COM, and AMP. It is 0V usually.
5 VDD 5.6V power supply.
6 AMP Power supply supply to remote amplifier
7 VCC Back up. connects with ACC with it.
8 ANT Power supply supply to auto antenna.
9 COM 8.7V power supply.
10 AM The power supply of 8.7V to AM.
11 FM The power supply of 8.7V to FM.
12 GND Ground
Pre
Drive
Thermal
Protection
Reference Voltage
Pre
Drive AMP
Out
ASO & Peak
Current Protection
AMP
Out
Pre
Drive Pre Drive Pre
Drive
123456789101112
ILL
10V MODE2 MODE1 STB VDD 5.6V AMP VCC ANT COM 8.7V AM 8.7V FM 8.7V GND

KS-F383R,KS-F380R
(No.49813)1-17
4.2 LC75823W (IC651) : LCD driver
• Pin Layout
• Pin function
Pin No. Symbol I/O Functions
1 to 52 S1 to S52 O Segment output pins used to display data transferred by serial data input.
53 to 55 COM1 to COM3 O Common driver output pins. The frame frequency is given by : t0=(fosc/384)Hz.
56 VDD -- Power supply connection. Provide a voltage of between 4.5 and 6.0V.
57 INH I Display turning off input pin.
INT="L" (Vss) ----- off (S1 to S52, COM1 to COM3="L"
INT="H" (VDD)----- on
Serial data can be transferred in display off mode.
58 VDD1 I Used for applying the LCD drive 2/3 bias voltage externally.
Must be connected to VDD2 when a 1/2 bias drive scheme is used.
59 VDD2 I Used for applying the LCD drive 1/3 bias voltage externally.
Must be connected to VDD1 when a 1/2 bias drive scheme is used.
60 Vss -- Power supply connection. Connect to GND.
61 OSC I/O Oscillator connection.
An oscillator circuit is formed by connecting an external resistor and capacitor at this pin.
62 CE I Serial data interface connection to the controller. CE : Chip enable
63 CL I Serial data interface connection to the controller. CL : Sync clock
64 DI I Serial data interface connection to the controller. DI : Transfer data
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
S48
S47
S46
S45
S44
S43
S42
S41
S40
S39
S38
S37
S36
S35
S34
S33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32
DI CL CE OSC Vss VDD2 VDD1 INH VDD COM3 COM2 COM1 S52 S51 S50 S49

KS-F383R,KS-F380R
1-18 (No.49813)
4.3 LA4743K (IC941) : Power amp.
• Block diagram
11
6 20
1
4
10
15
25
13
14
16
12
9
8
5
7
2
22
17
19
18
21
23
24
3
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
IN 1
IN 2
ST BY
Vcc 1/2 Vcc 3/4
OUT 1+
OUT 1-
PWR GND1
OUT 2+
OUT 2-
PWR GND2
R.F
IN 3
IN 4
PRE GND
ON TIME C Muting &
ON Time Control
Circuit
Protective
circuit
Protective
circuit
Mute
circuit
Ripple
Filter
Stand by
Switch
N.C
+
+
0.22 F
2200 F 0.022 F
0.22 F
TAB
+5V
ST ON
+
+
+
+
47 F
0.22 F
0.22 F
22 F
+
Mute 10K
+
3.3 F
OUT 3+
OUT 3-
Low Level
Mute ON
PWR GND3
OUT 4+
OUT 4-
PWR GND4

KS-F383R,KS-F380R
(No.49813)1-19
•Pinlayout
• Pin function
TAB GND FR- STDBY FR+ VP1 RR- GND RR+ RIPPLE INRF INRR SGND FLIN RLIN DNTIME RL+ GND RL- VP3 FL+ MUTE FL- GND NC
Pin No. Symbol Function
1 TAB Header of IC
2 GND Power GND
3 FR- Outpur(-) for front Rch
4 STDBY Stand by input
5 FR+ Output (+) for front Rch
6 VP1 Power input
7 RR- Output (-) for rear Rch
8 GND Power GND
9 RR+ Output (+) for rear Rch
10 RIPPLE Ripple filter
11 RRIN Rear Rch input
12 FRIN Front Rch input
13 SGND Signal GND
14 FLIN Front Lch input
15 RLIN Rear Lch input
16 ONTIME Power on time control
17 RL+ Output (+) for rear Lch
18 GND Power GND
19 RL- Output (-) for rear Lch
20 VP3 Power input
21 FL+ Output (+) for front
22 MUTE Muting control input
23 FL- Output (-) for front
24 GND Power GND
25 NC Non connection

KS-F383R,KS-F380R
1-20 (No.49813)
4.4 TEA6320T-X (IC911) : E.volume
• Pin layout
• Block diagram
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
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 to -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
23 25 24 26 27 28
30
29
1
32
3
4
10 8 9 7 6 512