Block Diagram; Components Description - Kenwood KAC-PS621 Service Manual

KAC-PS621/X621
IC1,10
IN ISO AMP
L
OUT
IN ISO AMP
R
OUT
DISP.
FAN
H/U COM
AMP COM
PREAMPLIFIER UNIT (X08-4150-10)
Ref. No
IC1 Infrasonic filter
IC3 Tone and volume variable
IC4 6dB voltage amplification
HPF
IC5
LPF
Lch : 6dB voltage amplification
IC6
Rch : Signal 180 reverse and 6dB voltage amplification
IC7 LCD driver
AUDIO UNIT (X09-5770-10)
Ref. No
IC1 Buffer
IC2 DC/DC converter
IC3 AMP communication buffer
2

BLOCK DIAGRAM

6dB
OPERATION IFS FILTER
MO/ST ON/OFF HPF/OFF/LPF
IC1 IC5
ISF HPF
LPF
ISF HPF
IC6
u-COM

COMPONENTS DESCRIPTION

Application / Function
Application / Function
12dB
SENSITIVITY AMP CONT
5V-0.2V
IC3
IC4,6
CONTROL
BUFFER
AMP
CONTROL
BUFFER
AMP
O.C. PROTE.
D.C. PROTE.
O.V. PROTE.
T.M. PROTE.
Q66
5V AVR
Q61
DC/DC CONV.
+15V AVR
Q62
-15V AVR
Operation / Condition / Compatibility
Controlled by microprocessor
Controlled by microprocessor
Operation / Condition / Compatibility
24dB
ON/OFF
Q107-135
Q101
POWER
MUTE
AMP
POWER
MUTE
AMP
OUT-L
OUT-R
BATT
GND
P-CON