JVC KS-FX202 User manual

SERVICE MANUAL
CASSETTE RECEIVER
No.49682
Jan. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
KS-FX202
KS-FX202
Area Suffix
E -------- Continental Europe
EX ------------Central Europe
KS-FX202
Contents
Safety precaution
Disassembly method
Adjustment method
1-2
1-3
1-12
1-16
Description of major ICs

KS-FX202
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

KS-FX202
1-3
Fig. 3
d
Front chassis
a
a
Disassembly 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.
Removing the bottom cover
( See Fig. 2 to 4 )
1. Removie the front chassis.
2. Turn the unit up side down.
3. Insert the screwdriver to the four engagements
( b, c, d, f ) .
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 chassis
Bottom cover
b
c
Fig. 4
f
Bottom cover
Rear panel

KS-FX202
1-4
Removing the heat sink (SeeFig.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 main 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 screw ( 3 ),the two screws(4) and the
four screws(5)retaining the rear panel .
6. Separate the main board assembly and cassette
mechanism assembly.
7. Take out the main board assembly.
Heat sink
Fig. 5
11
1`
Main board assembly
Fig. 6
2
2
( )
Rear panel Fig. 7
3
4
55

KS-FX202
1-5
Front cover
Front panel
Operation switch board
Fig. 9
Fig. 11
Fig. 10
Front cover
ii
i
77
77
g
h
h
h
gg
A
Removing the cassette mechanism assembly
( See Fig. 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 ( 6 ) retaining the cassette
mechanism.
6. Separate the top chassis and cassette mechanism.
Cassette mechanism
Front side
Top chassis
Fig. 8
6
6
66
Removing the operation switch 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 ( 7 ) 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 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-FX202
1-6
Fig. 14
10
10
Chassis 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 ( 8 ) 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 the 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 mechanism.
8. Remove the screw ( 9 ) 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
( 10 ) retaining the chassis assembly.
Fig. 12
To head relay board
Head amplifier board
CJ901
8
j
j
B
Fig. 13
Relay board
C
9k
10
10

KS-FX202
1-7
Prior to performing the following procedures, remove
the head amplifier board, the relay board and the
mechanism bracket.
<Cassette mechanism assembly>
Unsolder the three wires aon the direction switch
board.
Remove the one screw Aattaching the direction
switch board.
1.
2.
Removing the direction switch board
(See Fig.1)
Remove the screw Battaching the FF / REW lever
assembly on the back of the cassette mechanism
assembly.
Remove the screw Con the upper side of the FF /
REW lever assembly.
Lift and pull forward the FF / REW lever assembly to
disengage the joints b, c, dand 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 eto 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
Soldering a
Fig.1

KS-FX202
1-8
Prior to performing the following procedure, remove
the direction switch board and the FF / REW lever
assembly.
Remove the screw Dattaching 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 performing 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) assembly 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 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
Fig.2

KS-FX202
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 gin 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 direction of the arrow.
Lift the cassette hanger / cassette holder and disengage
the joint iof the return link and the eject lever.
1.
2.
3.
Removing the cassette hanger / cassette
holder (See Fig.3)
Unsolder the two wires jon 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 Gattaching 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 Eand one screw F. Replace
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)
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
Sub-belt
Motor assembly
Motor pulley
Soldering j
Fig.3
Fig.4
Fig.5
C washer
C washer
Chassis

KS-FX202
1-10
Raise the part kof 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 Eand 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 from 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.
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
Soldering j
Fig.4
Fig.5
Fig.6Fig.7
C washer
C washer
Pinch-roller (R) assembly
Turn the selector link (B).
k

KS-FX202
1-11
Unsolder the two wires lon the mute switch board on
the back of the cassette mechanism assembly.
Remove the screw Hattaching 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 mon the power switch on the
side of the cassette mechanism assembly.
Remove the screw Iattaching the power switch.
1.
2.
Removing the power switch (See Fig.9)
Cassette mechanism assembly
Soldering l
HMute
switch board
Soldering m
IPower switch
Cassette mechanism assembly
Rower switch
Motor assembly
Fig.8
Fig.9

KS-FX202
1-12
AM mode 999kHz/62dB,INT/400Hz,30%
modulation signal on recieving.
FM mono mode
FM stereo mode 1kHz,67.5kHz dev.pilot 7.5kHz dev
Output level 0dB(1 V,50 /open terminal)
97.9MHz/66dB,INT/400Hz,22.5kHz
deviation pilot off mono
Frequenc
Band
Adjustment method
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)
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)
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.
FM: 87.5 MHz to 108.0 MHz
AM : 522 kHz to 1620 kHz(MW)
144 kHz to 279 kHz(LW)

KS-FX202
1-13
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 , 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 assembly.
Check for mechanism driving section such as motor ,etc..
Disassembly methodl
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 carried by connecting
an extension cord jig.
Note
Available to connect to the CN701 connector when in-
stalling the front panel.

KS-FX202
1-14
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-FX202
1-15
Mechanism adjustment section
Item Adjusting & Confirmation Methods Adjust Std. 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
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.
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
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-FX202
1-16
AN80T05LF (IC781) : Regulator
1.Terminal layout & Block diagram
2.Pin function
Pre
Drive
Thermal
Protection
Reference Voltage
Pre
Drive
AMP
Out
ASO & Peak
Current Protection
AMP
Out
Pre
Drive Pre Drive Pre
Drive
1 2 3 4 5 6 7 8 9 10 11 12
ILL
10V MODE2 MODE1 STB VDD 5.6V AMP VCC ANT COM 8.7V AM 8.7V FM 8.7V GND
1
2
3
4
5
6
7
8
9
10
11
12
NC
TUNER
FM/AM
POWER CNT
5V
VSW 14VOUT
MEMORY
NC
9V
AM
FM
GND
Non connect
When 5V is input,becomes AM. and the antenna output is turned on.
When 5V is input,becomes AM. and the output of FM is switched.
When 5V is input, outputs to ILL,COM,and AMP. It is 0V usually.
5.6V power supply.
Power supply supply to remote amplifier
Back up. connects with ACC with it.
Non connect
8.7V power supply.
The power supply of 8.7V to AM.
The power supply of 8.7V to FM.
Ground
Pin
No.
Symbol Function
Description of major ICs

KS-FX202
1-17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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
DATA CLOCK CE OSC Vss INH VDD COM3 COM2 COM1 S52 S51 S50 S49
LC75823W (IC651) : LCD driver
1. Pin Layout & Symbol
2. Pin Function
Pin No.
1 to 7
8 to 52
53 to 55
57
58,59
60
61
62
63
64
I/O
--
O
--
I
--
I/O
I
Non connect
Common driver output pins. The frame frequency is given
by : t0=(fosc/384)Hz.
Power supply connection. Provide a voltage of between
4.5 and 6.0V.
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.
Non connect
Power supply connection. Connect to GND.
Oscillator connection.
An oscillator circuit is formed by connecting an external
resistor and capacitor at this pin.
Serial data CE : Chip enable
interface connection
to the controller. CL : Sync clock
DI : Transfer data
Symbol
S8 to S52
S53 to S55
INH
Vss
OSC
CE
CLOCK
DATA
Function

KS-FX202
1-18
LC72362N-9920 (IC701):System controller
1.Terminal Layout
41 - 64
24 - 1
25
40
80
64
- -
DIVIDER REFERENCE DIVIDER SELECTOR PHASE
DETECTOR E01
E02
SUBPD
SUB
C.P.
1/114, 1/124
PROGRAMMABLE DIVIDER
LATCH
SNSFF
V-DET
1/2 UNIVERSAL
COUNTER
(20bits)
UNLOCK
F/F
PHASE
DETECTOR EO3
PQ0
LATCH
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
BEEP
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
BUS
DRIV.
INTERRUPT
BUS
DRIV.
MPX
PI1/ADI5
PI0/ADI4
PH3/ADI3
PH2/ADI2
PH1/ADI1
PH0/ADI0
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
LATCH
BUS
DRIV.
BUS
DRIV.
SIO
RAM
512 4bits ADDRESS
DECODER
ROM
12K 16bits
BUS
DRIVER
INSTRU-
CTION
DECODER
ADDRESS DECODER
PROGRAM COUNTER
STACK
JUDGE
ALU
ADC
PP3
PP2
PP1
PP0
PO3
PO2
PO1
PO0
PN3
PN2
PN1
PN0/BEEP
PM3
PM2
PM1
PM0
PL3
PL2
PL1
PL0
PK3
PK2
PK1/INT1
PK0/INT0
PJ3
PJ2
PJ1
PJ0
MPX
1/16, 1/17
2.Block diagram
HOLD
TEST1
TEST2
PA0
PA1
PA2
PA3
PB0
PB1
PB2
BP3
PC0
PC1
PC2
PC3
PD0
PD1
PD2
PD3
PF0
SCK1/PF1
SO1/PF2
SI1/PF3
PF0
SCK1/PF1
SO1/PF2
SI1/PF3
PE0
SCK2/PE1
PO2/PE2
SI2/PE3
XIN
XOUT
FMIN
AMIN
SNS
VDD
VSS
HCTR
LCTR

KS-FX202
1-19
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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
XIN
GND
J BUS SI
J BUS SO
J BUS SCK
J BUSI/O SEL
NC
LCD SO
LCD SCK
LCD CE
NC
E.VOL SO
E.VOL SCK
NC
TUNER ILLUM
TAPE ILLUM
CD ILLUM
DIMMER OUT
NC
NC
NC
NC
NC
NC
KS1
KS0
K3
K2
K1
K0
Vdd
TEST
NC
SEEK/STOP
MONO
RADIO/TAPE
BEEP LEVEL
POWER CNT
Acc
NC
NC
NC
NC
BEEP
NC
NC
NC
TAPE IN
F/R SENSE
TAPE MUTE
SD/ST
NC
DETACH
NC
J BUS INT
REMOCON
FM/AM
DOLBY
NC
MUTE
MEMORY DET
LEVEL METER
SMETER
KEY 2
KEY1
KEY0
ACCDET
SENS
NC
FM/AM IF COUNT
NC
NC
Vdd
AM OSC
FM OSC
Vss
NC
ED
TEST 1
XOUT
I
-
I
O
O
O
-
O
O
O
-
O
O
-
-
-
-
-
-
-
-
-
-
-
-
O
I
I
-
I
-
I
-
O
O
-
-
O
-
-
-
-
-
-
-
-
-
I
I
I
I
-
I
-
I
-
I
-
-
-
I
I
I
I
I
I
I
-
I
-
-
-
I
I
-
-
O
-
O
Crystal oscillator
To GND
Bus serial data input from CP751
Bus serial data output to CP751
Bus serial clock output to CP751
BUS I/O switch signal output
Non connect
Serial data output to IC651
Serial clock output to IC651
Chip enable output to IC651
Non connect
Serial data output
Serial clock output
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
Initializing output port
Initializing input port
Initializing input port
Non connect
Initializing input port
Power supply
Test input
Non connect
Output the "If signal request"
Monaural and stereo change
over output
Non connect
Non connect
Power control output
Power supply
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
Non connect
H:RADIO L:TAPE
FORWARD/REVERSE switch detector
DIR.FF/REW MUTE
Station detector and ST input
Non connect
Detection of Front Panel
Non connect
BUS interruption signal detection communication
To GND
Change over the FM/AM Input
Non connect
Non connect
The mute time is controlled by the
connected capacitor when changing
over the FM/AM
Memorydetector input
Mementary key input
Mementary key input
Mementary key input
Signal meter input
ACC DET
To GND
Non connect
AM/FM Frequency detection
Non connect
Non connect
Power supply
Power supply
Input the local oscillator signal of AM
Input the local oscillator signal of FM
Non connect
PLL Error signal output
To GND
Crystal oscillator
Pin
No. Symbol I/O Function Pin
No. Symbol I/O Function
3.Description
LC72362N-9920

KS-FX202
1-20
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
1.Pin layout
3.Pin functions
2.Block diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin
No. Pin No.
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
SDA
GND
OUTLR
OUTLF
TL
B2L
B1L
IVL
ILL
QSL
IDL
MUTE
ICL
IMO
IBL
IAL
Serial data input/output.
Ground.
output left rear.
output left front.
Treble control capacitor left channel or
input from an external equalizer.
Bass control capacitor left channel or
output to an external equalizer.
Bass control capacitor left channel.
Input volume 1. left control part.
Input loudness. left control part.
Output source selector. left channel.
Not used
Not used
Input C left source.
Not used
Input B left source.
Input A left source.
I/O
-
O
O
I
-
-
I
I
O
-
-
I
-
I
I
Symbol I/O Symbol I/O
Input A right source.
Input B right source.
Electronic filtering for supply.
Input C right source.
Reference voltage (0.5Vcc)
Not used
Output source selector right channel.
Input loudness right channel.
Input volume 1. right control part.
Bass control capacitor right channel
Bass control capacitor right channel or
output to an external equalizer.
Treble control capacitor right channel or
input from an external equalizer.
Output right front.
Output right rear.
Supply voltage.
Serial clock input.
I
I
-
I
-
-
O
I
I
-
O
I
O
O
-
I
IAR
IBR
CAP
ICR
Vref
IDR
QSR
ILR
IVR
B1R
B2R
TR
OUTRF
OUTRR
Vcc
SCL
Functions Functions
TEA6320T-X (IC931) : E.volume