© 2004-2 PRINTED IN JAPAN
B53-0141-00 (N) 2704
POWER AMPLIFIER
KAC-PS541
KAC-X541
SERVICE MANUAL
01
2
3
4 5 6 7
8
9
30
30
FUSE(30A
×2)
POWER IN
RESET
REMOTE
TO H/U
ID NUMBER
VOLT
FAN
CURR
TEMP
MENU
Screw set
(N99-1752-05)
Screw set
(N99-1577-15)
Heat sink
(F01-1752-01)
Accessory
(W01-1606-05)
Cover
(F07-1142-12): KAC-X541
(F07-1143-12): KAC-PS541
Screw
(N07-0003-08)
Screw
(N09-4214-08)
Fuse (30A)
(F52-0015-05)
KAC-PS541/X541
2
BLOCK DIAGRAM
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
When AMP-CON SW ON, from H/U (via Lx-Bus) change
sound by AMP-CONTROL
COMPONENTS DESCRIPTION
(X09-5780-10)
(X08-4160-10)
ISOLATION
HIGH
AMPLIFIER
R
L
BUFFER
VR3
IC3
Q42
Q41
MUTE1
DIFFERENTIAL
STAGE
Q305,307,311
Q306,308,312
IC1
Q320,322
STAGE
B-CLASS
Q323,325
R
L
IC3
VR5
IFS
IC2
Q405,407,411
Q43
Q423,425
Q406,408,412
Q44
Q424,426
DC DETECTOR
OVER LOAD
Q56,57,60,61
Q30,31
CIRCUIT
P. CON
OVER VOLTAGE
CIRCUIT
I DETECTOR
BU DETECTOR
P-SW
SW5V
BU5V
Q25
DC/DC
CONVERTER
Q17,18,26
AVR
POP NOISE CIRCUIT
MUTE2
Q22
901,902
Q50-53
FAN
RST IC
E2PROM
I2C COMMUNICATION
to AMP
5L COMMUNICATION
to H/U
LOGO LED
DIP SW
DISPLAY
LCD
DRIVER IC
LCD
KEY
LED+B
MUTE1
DIFFERENTIAL
STAGE
STAGE
B-CLASS
MUTE1
DIFFERENTIAL
STAGE
STAGE
B-CLASS
MUTE1
DIFFERENTIAL
STAGE
STAGE
B-CLASS
VR1
VR1
PASS
BUFFER
AMPLIFIER
ISOLATION
AMPLIFIER
ISOLATION
AMPLIFIER
ISOLATION
PASS
HIGH
HIGH
PASS
LOW
PASS
HIGH
PASS
PASS
LOW
BUFFER
BUFFER
VR2
IFS
CONTROL
AMP
IC
SW5
RCA IN
RCA IN
RCA IN
RCA IN
ACH
BCH
VR4
IC1
IC1
IC1
IC2
IC3
VR2
VR5
VR4
SW5
VR3
IC3
SP
OUT
OUT
SP
OUT
SP
OUT
SP
THERMAL
PROTECTION
DETECTOR
DETECTOR
V-DOWN
Q11-16,
u-COM
BU
PCON
VCC
15V/-15V
COMMUNICA
TION
I2C
V
V
6db
6db
27db
KAC-PS541/X541
3
COMPONENTS DESCRIPTION
AUDIO UNIT (X09-5780-10)
Ref. No
Application / Function
Operation / Condition / Compatibility
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
LX communication output signal level converter
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
Ach first stage differential amplifier
Q314,319,321
Q315~318,415~418
Over current detection and protection
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
1dB attenuation circuit
KAC-PS541/X541
4
AMP_SCL
LX_REQ_M
LX_REQ_S
LX_DATA_M
LX_DATA_S
LX_CLK
LX_RST
HU_BU
AD-I
AD-V
TEMP1
TEMP2
TEMP3
TEMP4
TEMP5
TEMP6
COMM-SW
D-PWER
POWER-ON
5VSW
V_DOWN
PCON
LX_CON
L_DATA_L
L_DATA_A
L_CLK
L_CE
FAN1
FAN2
AMP_SDA
AUDIO_SCL
AUDIO_SDA
AUDIO_MUTE
E2P_SCL
E2P_SDA
LCD-ILL
WHITE-LED
MUTE1
MUTE2
DIP-SW1
DIP-SW2
DIP-SW3
DIP-SW4
MODEL1
MODEL2
DC-DET
D-CUR
AB-CUR
ATT1
ATT2
ATT3
AMP
µ-com
784224YGC117
Audio control
AMP communication I/F
LX BUS I/F
Display data monitor
Power supply control
LCD driver I/F
Fan control
Destination, AMP ID
Protection control
Illumination control
Mute control
E2PROM I2C
communication
MICROPROCESSOR : 784224YGC117 (X09 : IC3)
Block Digram
Terminal Function
Pin No.
Pin Name
I/O
Function
Processing Operation Description
1~3
TEMP4~TEMP6
I
Temperature detection 4~6
4AVSS
-
GND
5
L_CE
O
CE output to LCD driver
H : LCD driver CE
6
LX_REQ_S
O
Data transmit request to H/U
H : OFF, L : ON
7AVREF1
-
DA reference voltage
8
L_DATA_L
I
Data input from LCD driver
9
L_DATA_A
O
Data output to LCD driver
10
L_CLK
O
CLK output to LCD driver
11
LX_DATA_M
I
Data input from H/U
12
LX_DATA_S
O
Data output to H/U
13
LX_CLK
I
CLK input from H/U
14
LX_BU
I
LX BUS communication, H/U connect detection
H : Not connect (Except master amplifier), L : Connect
15
NC
O
Not used
16
SDA_AMP
I/O
Data input/output AMP communication
17
NC
O
Not used
MICROCOMPUTER'S TERMINAL DESCRIPTION
KAC-PS541/X541
5
Pin No.
Pin Name
I/O
Function
Processing Operation Description
18
SCL_AMP
I/O
CLK input/output AMP communication
19
AUDIO_SCL
I/O
CLK input/output with audio chip
20
AUDIO_SDA
I/O
Data input/output with audio chip
21
AUDIO_MUTE
O
Mute output to audio chip
H : Mute OFF, L : Mute ON
22
E2P_SCL
I/O
CLK input/output with E2PROM
23
E2P_SDA
I/O
Data input/output with E2PROM
24
NC
O
Not used
25~28
DIP-SW1~DIP-SW4
I
AMP address setting
29
MODEL1
I
Model setting 1
30
MODEL2
I
Model setting 2
31,32
NC
O
Not used
33
VSS1
-
GND
34~37
NC
O
Not used
38
LCD-ILL
O
LCD backlight switch
H : ON, L : OFF
39
WHITE-LED
O
Triangle illumination switch
H : ON, L : OFF
40
NC
O
Not used
41~43
ATT1~ATT3
O
Output attenuate due to rise in temperature 1~3
H : Attenuate, L : Not attenuate
44,45
NC
O
Not used
46
COMM-SW
O
Communication IC power switch
H : ON, L : OFF
47~50
NC
O
Not used
51
D-PWER
O
D class amplifier power supply control
H : ON, L : OFF (2ch/4ch L fixed)
52
DC-DET
I
Speaker output DC voltage detection
H : Normal, L : Abnormal
53
NC
O
Not used
54
POWER-ON
O
Amplifier power supply control
H : ON (D/AB class), L : OFF
55
5VSW
O
5VSW
H : OFF, L : ON
56
MUTE1
O
Amplifier section input stage mute control
H : OFF, L : ON
57
MUTE2
O
Driver stage pop-noise mute control
H : OFF, L : ON
58
FAN1
O
Fan rotation control
H : Operate, L : Stop
59
FAN2
O
Fan speed control
H : Low speed, L : High speed
60
RESET
-
Hard reset
H : Normal, L : Reset
61
PCON
I
Amplifier power control
H : OFF, L : ON
62
LX_CON
I
LX-BUS communication control
H : OFF, L : ON
63
LX_REQ_M
I
Data receive request from H/U
H : ON, L : OFF
64
NC
O
Not used
65
V_DOWN
I
Momentary power down detection
H : ON (Power down detection), L : OFF (L fixed)
66
NC
O
Not used
67
VSS0
-
GND
68
VD1
-
VDD
69
X2
-
Main clock input 1
70
X1
-
Main clock input 2
MICROCOMPUTER'S TERMINAL DESCRIPTION