Kenwood KAC-PS541, KAC-X541 Service Manual
POWER AMPLIFIER
KA C-PS54 1
KA C-X54 1
SERVICE MANUAL
© 2004-2 PRINTED IN JAPAN
B53-0141-00 (N) 2704
Heat sink
(F01-1752-01)
Screw
(N07-0003-08)
30
30
FUSE(30A×2)
Fuse (30A)
(F52-0015-05)
Cover
(F07-1142-12): KAC-X541
(F07-1143-12): KAC-PS541
POWER IN
Screw
(N09-4214-08)
5
6
4
7
3
8
2
9
1
0
VOLTFAN
CURRTEMP
RESETREMOTETO H/UID NUMBER
MENU
Screw set
(N99-1752-05)
Screw set
(N99-1577-15)
Accessory
(W01-1606-05)
KA C-PS541/X541
BLOCK DIAGRAM
(X09-5780-10)
IC1
RCA IN
ACH
RCA IN
RCA IN
BCH
RCA IN
ISOLATION
L BUFFER
AMPLIFIER
IC1
ISOLATION
R
AMPLIFIER
IC1
ISOLATION
L
AMPLIFIER
IC1
ISOLATION
R
AMPLIFIER
(X08-4160-10)
6db 6db 27db
V
V
IC2
IFS
IC2 IC3
IFS
LCD
DISPLAY
LOGO LED
5L COMMUNICATION
to H/U
I2C COMMUNICATION
to AMP
FAN
E2PROM
RST IC
VR4
HIGH
PASS
VR5
LOW
PASS
VR5
LOW
PASS
VR4
HIGH
PASS
LCD
DRIVER IC
KEY LED+B
VR2
VR2
IC3
BUFFER
BUFFER
u-COM
DIP SW
VR3
HIGH
PASS
VR3
HIGH
PASS
VR1
VR1
AMP
CONTROL
IC
COMMUNICATION
I2C
15V/-15V
IC3
IC3
BUFFER
SW5
SW5
Q17,18,26
AVR
Q50-53
MUTE2
POP NOISE CIRCUIT
Q41
MUTE1
Q42
MUTE1
Q43
MUTE1
Q44
MUTE1
Q305,307,311
DIFFERENTIAL
STAGE
Q306,308,312
DIFFERENTIAL
STAGE STAGE
Q405,407,411
DIFFERENTIAL
STAGE STAGE
Q406,408,412
DIFFERENTIAL
STAGE STAGE
VCC
Q11-16,
901,902
DC/DC
CONVERTER
P-SW
Q22
BU5V
Q25
SW5V
Q323,325
B-CLASS
STAGE
Q320,322
B-CLASS
Q423,425
B-CLASS
Q424,426
B-CLASS
Q56,57,60,61
DC DETECTOR
OVER LOAD
DETECTOR
Q30,31
P. CON
CIRCUIT
OVER VOLTA GE
CIRCUIT
THERMAL
PROTECTION
V-DOWN
DETECTOR
I DETECTOR
BU DETECTOR
SP
OUT
SP
OUT
SP
OUT
SP
OUT
PCON
BU
COMPONENTS DESCRIPTION
● PREAMPLIFIER UNIT (X08-4160-10)
Ref. No Application / Function Operation / Condition / Compatibility
IC1 (1/4, 2/4) : Ach HPF, (2/4) : ALch buffer, (3/4) : BRch 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) : BLch buffer, (2/2) : BRch invert buffer
IC7 LCD driver, key scan
IC8 Bch E-VOL IC
2
When AMP-CON SW ON, from H/U (via Lx-Bus) change
sound by AMP-CONTROL
KA C-PS541/X541
COMPONENTS DESCRIPTION
● AUDIO UNIT (X09-5780-10)
Ref. No Application / Function
IC1,2 Input isolation amplifier
IC3 Microprocessor
IC4 Microprocessor reset IC
IC6 Current detection circuit voltage amplification
IC8 LX communication LX-CLK, LX-DATA-M comparator
IC9 AMP I2C communication signal level converter
IC10 Switching regulator
Q1 14V power supply for LX communication circuit and AMP communication IC
Q2 VDD 5V AVR
Q7~10 FET drive
Q11~16 DC/DC converter
Q17,26 +15.6V AVR
Q18,27 -15.6V AVR
Q20,21 Switching regulator power switch
Q22,24 VDD 5V AVR
Q25 SW5V
Q30,31 Standby, P-CON
Q41~44 Mute driver
Q50~53 Shock noise prevention
Q54 Mute
Q56,57 Output DC abnormal voltage detection
Q58 Logo LED power supply
Q59 LCD illumination power supply
Q61 Over current detection and protection
Q62~67 Fan operation circuit
Q73,77 BU over voltage detection
Q74,75 FET drive low start switch
Q80~83 LX communication input signal level converter
Q84 LX communication circuit power supply and AMP communication IC1 power switch
Q85,86,90,92~96,98
Q91 14V power supply for LX communication circuit and AMP communication IC
Q210 Ach first stage differential amplifier
Q212,311,411,412 Temperature compensation bias
Q301~309,312
Q314,319,321
Q315~318,415~418
Q320,322,323,325 Ach final current amplifier
Q401~410 Bch first stage differential amplifier
Q423-426 Bch final current amplifier
Q901,902 DC/DC converter
Q905,906,945,946,967
LX communication output signal level converter
Ach first stage differential amplifier
Over current detection and protection
1dB attenuation circuit
Operation / Condition / Compatibility
3
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