2
KAC-7204
BLOCK DIAGRAM
COMPONENTS DESCRIPTION
Bass
Boost
SP
OUTPUT
ISO-AMP
ISO-AMP
SENS.
VOL
LINE IN
L
R
(0.2~5V)
L
R
LINE
OUT
Bass
Boost
MUTE
ATT
POWER AMP
MUTE
ATT
BATT.
GND
P-CON
POWER
ON/OFF
LC FILTER
±B
±15V
AVR
DC/DC
CON
FAN
AVR
THERMAL
DET
OVERLOAD
DET
DC-OFFSET
DET
FAN
L
R
(INV)
L.P.F
FREQ
H.P.F
H.P.F
FREQ
(50~200Hz)
FREQ
LPF/OFF/HPF
FREQ
(40Hz)
L+
L-
R-
R+
SIGNAL
DETECTOR
P-CON
PRIORITY
-0.83dB_ATT
+6.85dB_AMP
=6.0dB
-0.5dB_ATT
+16.4dB_AMP
=15.9dB
+15.8dB
40Hz=18dB
40A x1
-0.83dB_ATT
+6.85dB_AMP
=6.0dB
POWER AMP
40Hz=18dB
(50~200Hz)
(50~200Hz)
IC2
IC1
IC7
IC12
IC7
IC8
IC8
IC10
IC11
Q281,283
Q282,284
Q241
Q242
Q201...229
Q202...226
Q215-218,610
Q611,612
TH601,602,605
Q1,2
D5,6
Q50,D50,52
Q605
Q604
IC5
Q609, 699
●
AUDIO UNIT (X09-8760-10)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1,2
Isolation circuit
IC5
DC/DC converter
IC6
Temperature ATT control
ATT2=on by pin1=H, ATT1=on by pin7=H
IC7
HPF
IC8
Buffer ampli
fi
er, Rch inversion ampli
fi
er
IC10,11
bass-boost
IC12
LPF
Q1,16
+15V power supply
Q2,17
-15V power supply
Q3~8
DC/DC switching FET
Q9~14
DC/DC switching FET drive Tr
Q15
Temperature ATT reference power supply
Q50,51
auto_pcon_off
Disables operation of the auto_pcon circuit when the pcon_ is connected
