Block Diagram; Components Description - Kenwood KAC-PS521 Service Manual

KAC-PS521/X521
(X09-5760-10)
IC1,10
to H/U
to POWER AMP
BAT
GND
P-CONT
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 (X09-5760-10)
Ref. No
IC1 Buffer
IC2 DC/DC converter
IC3 AMP communication buffer
2

BLOCK DIAGRAM

IC1
I.S.A I.F.S
ED1
LCD
(X08-4150-10)
IC6
u-COM
V PROT.
Q356,358
FAN AVR
IC2
DC/DC
CONVERTER

COMPONENTS DESCRIPTION

Application / Function
Application / Function
L.P.F
IC3,4,6
AMP
CONT.
IC5
H.P.F
IC7
LCD
DRIVER
Q69
Q66
SW 5V
5V AVR
AVR
Q61
+15V AVR
Q62
-15V AVR
Controlled by microprocessor
Controlled by microprocessor
POWER AMP
Q101,102
MUTE
DC PROT
CURRENT PROT
TEMP
PROT.
FAN
Operation / Condition / Compatibility
Operation / Condition / Compatibility