Block Diagram; Components Description; Preamplifier Unit (X08-4160-11) - Kenwood KAC-X542 Service Manual

KAC-X542
(X09-5780-11)
(X08-4160-11)
6db
IC1
RCA IN
ISOLATION
L
AMPLIFIER
ACH
IC1
ISOLATION
R
AMPLIFIER
RCA IN
V
IC1
RCA IN
ISOLATION
L
AMPLIFIER
BCH
IC1
ISOLATION
R
AMPLIFIER
RCA IN
V
LCD
DISPLAY
LOGO LED
5L COMMUNICATION
to HEAD UNIT
I2C COMMUNICATION
to AMP
E2PROM
RST IC

PREAMPLIFIER UNIT (X08-4160-11)

Ref. No
IC1 (1/4, 2/4) : Ach HPF, (2/4) : A-Lch buffer, (3/4) : B-Rch invert buffer
IC2 Bch infrasonic filter
IC4 (1/4, 2/4) : Bch HPF, (3/4, 4/4) : Bch LPF
IC5 Bch buffer
IC6 (1/2) : B-Lch buffer, (2/2) : B-Rch invert buffer
IC7 LCD driver, key scan
IC8 Bch E-VOL IC
2

BLOCK DIAGRAM

VR4
HIGH
PASS
IC2
VR2
IFS
VR5
LOW
PASS
VR5
LOW
PASS
IC2
VR2
IFS
VR4
HIGH
PASS
LCD
KEY
DRIVER IC
IC3
FAN
DIP SW

COMPONENTS DESCRIPTION

Application / Function
VR3
6db
HIGH
PASS
IC3
VR1
BUFFER
VR3
HIGH
PASS
IC3
VR1
BUFFER
IC3
BUFFER
AMP
CONTROL
SW5
IC
SW5
IC3
BUFFER
15V/-15V
LED+B
Q17,18,26
AVR
Q50-53
MUTE2
u-COM
POP NOISE CIRCUIT
When AMP-CON SW ON, from H/U (via Lx-Bus) change
sound by AMP-CONTROL
27db
Q305,307,311 Q323,325
Q41
DIFFERENTIAL B-CLASS
MUTE1
STAGE STAGE
Q306,308,312 Q320,322
Q42
DIFFERENTIAL B-CLASS
MUTE1
STAGE STAGE
Q405,407,411 Q423,425
Q43
DIFFERENTIAL B-CLASS
MUTE1
STAGE STAGE
Q406,408,412 Q424,426
Q44
DIFFERENTIAL B-CLASS
MUTE1
STAGE STAGE
Q56,57,60,61
DC DETECTOR
OVER LOAD
VCC
DETECTOR
Q11-16,
901,902 Q30,31
DC/DC P. CON
CONVERTER CIRCUIT
OVER VOLTAGE
P-SW
CIRCUIT
THERMAL
PROTECTION
Q22
V-DOWN
BU5V
DETECTOR
I DETECTOR
Q25
SW5V BU DETECTOR
Operation / Condition / Compatibility
SP
OUT
SP
OUT
SP
OUT
SP
OUT
PCON
BU