JVC KS-FX893 User manual

1-1
KS-FX893
SERVICE MANUAL
CASSETTE RECEIVER
No.49763
Nov. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
KS-FX893
KS-FX893
Area Suffix
UF China
Contents
Safety precaution
Disassembly method
1-2
1-3
Adjustment method
Description of major ICs
1-11
1-15~24

1-2
KS-FX893
!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
!Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.

1-3
KS-FX893
Disassembly method
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.
Removing the front chassis (See Fig.1~2)
Removing the heat sink (See Fig.3)
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
BHeat sink
Fig.2
Fig.1
Fig. 3
Front chassis

1-4
KS-FX893
Removing the bottom cover (See Fig.4)
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.5 )
1.
2.
3.
4.
Remoe the front chassis.
Remove the heat sink.
Remove the bottom cover.
Remove the seven 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.6)
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. 4
Fig. 5
Fig. 6
B
C
B
B
D
D
CP701
Main board assembly

1-5
KS-FX893
Cassette mechanism assembly
F
FF
Top cover
Fig. 7
GG
G
G
Fig. 8
Fig. 9
LCD & Key control board
F
Removing the Cassette mechanism
assembly (See Fig.7)
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.8 and 9 )
1.
2.
3.
Remove the front panel unit from the main body.
Remove the four screws Gattaching the rear cover
on the back of the front panel unit.
Remove the control switch board from the front
panel unit.

1-6
KS-FX893
For the 6pin wire extending from connector CN402
on the head amplifier board, disconnect it from the
head relay board.
Disconnect the card wire from connector CN403 on
the head amplifier board.
Remove the screw Aattaching the head amplifier
board.
Move the tab aas shown in Fig.2 and remove the
head amplifier board while moving it in the direction
of the arrow.
1.
2.
3.
4.
<Removal of the cassette mechanism>
Removing the head amplifier board.
(See Fig.1 and 2)
Disconnect the 6pin wire from connector CN402 and
the card wire from CN403 on the head amplifier
board (Refer to Fig.1 and 2).
Remove the four screws Bon 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
board
6pin
wire
CN402
CN403
CN402
Head amplifier board
Fig.2
Tab a
Head amplifier board
Fi
g
.3
Cassette mechanism ass’
y
B
B
A
Head amplifier board
CN403

1-7
KS-FX893
Unsolder the soldering bon the head relay board.
Remove the screw Cattaching the head relay board.
Remove the head relay board in the direction of the
arrow while releasing the two joints c.
1.
2.
3.
Removing the head relay board
(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 board.
Remove the screw Dattaching the sub chassis.
Push the tab ein 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 board, the load arm and the sub
chassis.
Remove the screw Eattaching the reinforce bracket.
Remove the reinforce bracket.
Push the tab gfixing 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 hto 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 C
Soldering b Joint c
Fig.6
Tab f
D
Tab e
Cach
Head relay board
Head relay board
Fi
g
.7
Reinforce bracket
Reinforce
bracket
E
Cassette holder
Sub chassis
Head relay
board
Joint h
Holder arm
Load arm
Joint h
tab g
Fig.5
Spring d
Load arm E washer
Cassette mecha chassis

1-8
KS-FX893
Prior to performing the following procedure, remove
the head relay board and the sub chassis.
Remove the two screws Fattaching 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 board 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 jon the reel disc board.
Push the seven tabs kon the bottom of the cassette
mechanism assembly in the direction of the arrow.
1.
2.
Removing the reel disc board
(See Fig.10)
Unsolder the two soldering lof 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’yPinch roller ass’y
F
Play head
Spring
Fi
g
.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 board
Soldering j
Tabs k
G
G
Motor Belt
Flyhwheel

1-9
KS-FX893
Prior to performing the following procedure, remove
the head relay board, the load arm, the sub chassis,
the cassette holder, the holder arm and the reel disc
board.
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 board, the load arm, the sub chassis,
the cassette holder and the holder arm.
Disengage the part ninside 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 board
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

1-10
KS-FX893
Release the plate from the three tabs o.
Push aside the gear over the reel table using a
pincette or something like that.
Remove the reel disc ass’y ( ) as with the reel disc
ass’y ( ).
1.
2.
3.
Removing the reel disc ass’y( )
(See Fig.12 to 15)
Do not break the front panel tab fitted
to the metal cover.
ATTENTION:
Prior to performing the following
procedure, remove the reel disc ( ).
ATTENTION:
Fig.15
Push aside the gear and reattach the reel disc Ass’y( ).
Reel disc ass’y( )

1-11
KS-FX893
Adjustment method
Test instruments required for adjustment
1. Digital oscilloscope(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 CTG-N
(mechanism adjustment)
Measuring conditions(Amplifier section)
Power supply voltage .............. DC14.4V (10.5 - 16V)
Load impedance ........... 4 (2Speakers connection)
Line out............................................................ 20k
Standard volume position
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.
AM mode 1000kHz/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)

1-12
KS-FX893
Head section view
Cassette mechanism
(Surface)
Arrangement of adjusting & test points
Motor assembly
Tape speed adjust
Playback head
Azimuth screw B
(Reverse)
Azimuth screw B
(Reverse)
Azimuth screw A
(Forward)
Azimuth screw A
(Forward)
Playback Head

1-13
KS-FX893
EXTKSRT002-18P
Information f or using a car audio service jig
1. 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 : EXTKSRT002-18P ( 18 pin extension 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 carried by connecting
an extension cord jig.
Note
Available to connect to the CP701 connector when in-
stalling the front panel.
Cassette mechanism
to Main board
to Cassette mechanism
Front panel assembl
y
Main board
Extension cord
EXTKSRT002-18P
CP701

1-14
KS-FX893
Mechanism adjustment section
Item Adjusting & Confirmation Methods Adjust Std. Value
1.Check to see if the reading of the frequency counter & W ow
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/
10kHz and -4+2dB at 1kHz/63Hz.
3.When 10kHz is out of specification, it will be necessary to
read adjust the azimuth.
Phase
045
Built-in
volume resistor
Tape Speed
2940-3090Hz
Wow&Flutter
Less than
0.35%
(JIS RMS)
Speaker out
1kHz/10kHz
: 0dB 3dB,
63Hz/1kHz
: -4dB+2dB,
1. Tape running
adjustment
2. Azimuth
adjustment
confirmation
a) At forward play mode, make adjustment of peak of Lch / Rch
output with Azimuth screw A.
* For Oscilloscope litharge corrugation, set 45 as standard.
b) At Reverse play mode, make adjustment of peak of Lch / Rch
output with Azimuth screw B.
* For Oscilloscope litharge corrugation, set 45 as standard.
c) With AC volt meter confirm the difference of output for 4ch
between Lch / Rch at forward play mode and Lch / Rch
Reverse play mode being within 3.0dB.
d) After operation, make confirmation of Lch / Rch azimuth
output being within 1.0dB from adjustment value.
a) At Forward playmode, using mirror tape, make adjustment
with Azimuth screw A and Azimuth screw B, without curl of 4
parts of head tape guide.
b) At Reverse play mode, using mirror tape, make adjustment
with Azimuth screw A and Azimuth screw B, without tape
curl of 4 parts of head guide.
c) At Forward / Reverse play mode, make confirmation of no
tape curl of 4 parts of head tape guide.
2.Tape Speed and
Wow & Flutter
3.Playback
Frequency
response
Azimuth
screw A
Azimuth
screw B
HEAD
Tape guide
OK
HEAD TAPE
Tape curl NG

1-15
KS-FX893
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 (IC161) : E. volume
Description of major ICs

1-16
KS-FX893
I/O
LC72366-9987 (IC701) : System CPU
Symbol FunctionPin No.
XIN
GND
J-BUS SI
J-BUS SO
J-BUS SCK
J-BUS I/O
TEL-MUTE
LCD SO
LCD SCK
LCD CE
DIMMER IN
EVOL SO
EVOL SCK
OPEN
POWER ANT
MUTE
CD ILLUM
DEMEROUT
NC
NC
NC
NC
NC
NC
KS1
KS0
K3
K2
K1
K0
Vdd
TEST
FF/REW MODE
SEEK/STOP
MONO
RADIO/TAPE
BEEP LEVEL
PWR-CNT
ACC
KICK
I
-
I
O
O
O
I
O
O
O
-
O
O
I
I
I
-
O
-
-
-
-
-
-
-
O
I
I
-
I
-
I
O
O
O
-
-
O
-
-
Crystal oscillator input port
Connect to GND
Data input for J-BUS information
Data output for J-BUS information
Clock output for J-BUS information
Switching signal output for J-BUS information I/O, H:Out L:In
Telephone mute signal input
Data output for LCD driver
Information clock output for LCD driver data
Chip enable output for LCD driver
None connection
Data output for electrical volume
Clock output for electrical volume information
Door open detect input
Power ant ON signal input
Mute signal input
Non connection
DIMMER control signal output
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
Non connection
Diode matrix output port for initial establishing
Diode matrix output port for initial establishing
Diode matrix output port for initial establishing
Non connection
Diode matrix output port for initial establishing
5V power supply port (+B)
Turn on all light indicator of LCD, L: All light a LED indicator
FF/REW mode select signal output
H:Auto seek, L: Stop Use both as IF count REQ and Seek/Stop
Forced monaural output port, H:Turn on Forced monaural
Non connection
Non connection
"H" : Turn on power
Non connection
Non connection
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
1. Pin layout
2. Pin function
24 ~ 1
41 ~ 64
25
40
~
80
65
~

1-17
KS-FX893
I/OPort Name FunctionPin No.
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
MOTOR
SUBMO+
SUBMO-
BEEP
TAPE IN
STANDBY
REEL
MODE
F/R
MS
SD/ST
DETACH
ENC1
ENC2
J-BUS INT
REMOCON
FM/AM
DOLBY
NC
NC
MEM DET
LEVELMETER
S.METER
KEY2
KEY1
KEY0
ACCDET
SENSE
AM IF COUNT
FM IF COUNT
NC
NC
Vdd
AM OSC
FM OSC
VSS
NC
E0
TEST1
XOUT
O
O
O
-
I
I
I
I
I
I
I
O
I
I
I
-
O
-
-
-
I
I
I
I
I
I
I
I
-
I
-
-
-
I
I
-
-
O
-
O
Main motor output, H:Transport L: Stop
Sub-motor output(+), Loading direction to transport output
Sub-motor output(-), Eject direction to transport output
Non connection
Switch for detecting to input cassette, L: Cassette in
Switch for detecting standby position
Switch for detecting tape end position
Detecting mode position input
Switch for detecting forward/reverse , H:FWD L:REV
MS input port,
Station detector, Stereo signal input, H:SD
Front panel detect
Connect to encoder 1
Connect to encoder 2
Cut in signal detecting port from J-Bus information
Non connection
FM/AM mode switching signal port, H:FM L:AM
Non connection
Non connection
Non connection
Back-up power supply detecting port, H:input L:no input
Pressure voice level voltage input for level meter.
S meter voltage input
Key 2 input port
Key 1 input port
Key 0 input port
Hold port for Acc detecting, L: Hold mode
Voltage sensor port
Non connection
FM frequency detecting
Non connection
Non connection
5V power supply (+B)
Non connection
FM limited signal input
Ground port for power supply
Non connection
Error signal output port for PLL
Test port for LSI, To connect ground
4.5MHz crystal oscillator output
LC72366-9987(2/2)

1-18
KS-FX893
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
TA B
+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
LA4743K (IC301) : Power amp
1.Block diagram

1-19
KS-FX893
2.Terminal layout
3.Pin function LA4743B
TA B
GND
OUTRR-
STBY
OUTRR+
VCC1/2
OUTRF-
GND
OUTRF+
RIPPLE
INRF
INRR
SGND
INLR
INLF
ONTIME
OUTLF+
GND
OUTLF-
VCC3/4
OUTLR+
MUTE
OUTLR-
GND
NC
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
SymbolPin No. Function
Header of IC
Power GND
Outpur(-) for front Rch
Stand by input
Output (+) for front Rch
Power input
Output (-) for rear Rch
Power GND
Output (+) for rear Rch
Ripple filter
Rear Rch input
Front Rch input
Signal GND
Front Lch input
Rear Lch input
Power on time control
Output (+) for rear Lch
Power GND
Output (-) for rear Lch
Power input
Output (+) for front
Muting control input
Output (-) for front
Power GND
Non connection
1 2 3 4 5 6 7 8 9
10
GND OUT1 P1 VZ IN1 IN2 VCC1 VCC2 P2 OUT2
Input Output Mode
IN1 IN2 OUT1 OUT2
Brake
0 0 0 0
1 0 1 0
0 1 0 1
1 1 0 0
CLOCKWISE
COUNTER-CLOCKWISE
Brake
LB1641 (IC402) : DC motor driver
1. Pin layout 2. Pin function

1-20
KS-FX893
2. Pin function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
PBTC1
PBOUT1
OUTREF1
TAPEIN1
Vcc
NC
LINEOUT1
TCH1
NC
MSLPF
G2FB
G1FB
MSTC
MSOUT
NC
NRSW
MUTESW
TAPESW
DRSW
MSMODE
MSSW
NC
TCH2
LINEOUT2
Pin No. Symbol
-
O
O
I
-
-
O
-
-
-
-
-
-
O
-
I
I
I
I
I
I
-
-
O
Playback equalizer amplifier
capacitance
Playback equalizer amplifier
output
Output reference
TAPE input
Power supply
Non connection.
Line output
Time constant for the HLS
Non connection.
Cut-off frequency adjustment
of the music sensor LPF
Music signal interval detection
Music signal interval detection
Time constant for detecting
music signal interval
Music sensor out
No use
Dolby NR control
Mute function control
Playback equalizer amplifier
control
Head select control
Music sensor mode control
Music sensor control
Non connection.
Time constant for the HLS
Line output
I/O Function
Pin No. Sy mbol
I/O Function
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
DIREF
GND
TAPEIN2
OUTREF2
PBOUT2
PBTC2
PBFB2
PBRIN2
PBGND
PBFIN2
VCT
PBREF
PBFIN1
PBGND
PBRIN1
PBFB1
-
-
I
O
O
-
I
I
-
I
O
O
I
-
I
I
Resistance for setting the
reference
Ground
TAPE input
Output reference
Playback equalizer amplifier
output
Playback equalizer amplifier
capacitance
Playback equalizer amplifier
feedback
Playback equalizer amplifier
input
Playback equalizer amplifier
ground
Playback equalizer amplifier
input
Center
Playback equalizer amplifier
reference
Playback equalizer amplifier
input
Playback equalizer amplifier
ground
Playback equalizer amplifier
input
Playback equalizer amplifier
feedback
PBFB2
PBRIN2
PBGND
PBFIN2
VCT
PBREF
PBFIN1
PBGND
PBRIN1
PBFB1
MSMODE
DRSW
TAPESW
MUTESW
NRSW
MSOUT
MSTC
G1FB
G2FB
PBTC2
PBOUT2
OUTREF2
TAPEIN2
GND
DIREF
LINEOUT2
TCH2 NC
MSSW
PBTC1
PBOUT1
OUTREF1
TAPEIN1
Vcc
NC
LINEOUT1
TCH1
NC
MSLPF
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30 29 28 27 26 25 24 23 22 21
20
19
18
17
16
15
14
13
12
11
31
32
33
34
35
36
37
38
39
40
7k/12k
300k
F2
F1
30k
30k
45k
300k
7k/12k
F3
OFF/B
100k
T1
-
+
+
-
70 /120
1
1
T2
100k OFF/B
NR
NR
BIAS
MUTE
TA P E E Q
FWD/RVS
LPF +
-DET
Vcc
MS MODE
NR MODE
MS ON/
OFF
-
+
NC
+
-
1. Pin layout & Block diagram
CXA2560Q (IC401) : Dolby B type noise reduction system with play back equalizer amp.
70 /120