KAC-7202/7252
2
BLOCK DIAGRAM
50-200Hz
HPF
SENS
L
LINE IN
ISO AMP
IC12,16
IC1(X08)
LINE OUT
L
40-100Hz
BASS
BOOST
MUTE
Q201-258
POWER AMP
IC7-9,13,15
Q241,242
MO/ST
LINE OUT
R
LINE IN
R
MUTE
BOOST
50-200Hz
40-100Hz
HPF
BASS
SP IN
L
SP IN
R
CONTROL
f, GAIN
REMOTE
CONTROL
D.D. CON.
AVR
GAIN=0-18dB
f=40-100Hz
SP OUT L
SP OUT R
P-CON
BATT
GND
15V
LPF
50-200Hz
IC1
LPF/OFF/HPF
IC3(X08)
COMPONENTS DESCRIPTION
ADJUSTMENT
No.
ITEM
ALIGNMENT POINT
METHOD
ALIGN FOR
NOTE
IDLE
VR1 (Lch)
Connect a DC voltmeter
After Power on
1
CURRENT
VR2 (Rch)
between check land
2.5mV
5 minutes
(Refer to PC BOARD)
●
PREAMPLIFIER UNIT (X08-4190-1x)
Ref. No.
Application / Function
IC1
HPF
IC2
Phase reversal amplifier (Lch only)
IC3
LPF
IC4~6
Bass-boost circuit
IC7
Bass-boost mixing amplifier
●
AUDIO UNIT (X09-5830-1x)
Ref. No.
Application / Function
IC1,12,16
Input isolation amplifier
IC5
DC/DC converter
IC6
Temperature detection comparator
IC7,8
For adjusting bass-boost f
IC9
For adjusting bass-boost gain
IC13
Bass-boost phase shifter
IC15
Bass-boost mixing amplifier
Q1,2
±
15V AVR
Q3~8
DC/DC converter FET
Q9~12
DC/DC converter FET driver
Q13,14
For controlling DC/DC converter FET driver
Ref. No.
Application / Function
Q101
Remote controller reference voltage
Q201~204
Power amplifier initial step differential driving
Q209,210
Current limiter
Q205~208
Power amplifier second step differential driving
Q211,213
Temperature detection for idling
Q220,222~227,229
Power amplifier final
Q241,242
Power amplifier mute
Q251~258
Power amplifier driver
Q280,282
Power amplifier ATT (-3dB)
Q601,615~618
Power-ON shock preventer circuit
Q602
P-Con OFF detection
Q603
Mute drive
Q604,605
P-Con control circuit
Q606
Excess voltage detection
Q607,608,619,620
Temperature detection control circuit
Q609
Fan power supply
Q610
Excess current detection
Q611,612
DC detection
Q613,614
DC detection for latch
Q621,622
For LED control
Q623
Temperature detection control circuit
