© 2004-2 PRINTED IN JAPAN
B53-0140-00 (N) 2704
POWER AMPLIFIER
KAC-PS621
KAC-X621
SERVICE MANUAL
VOLT
FAN
CURR
TEMP
MENU
01
2
3
4 5 6 7
8
9
POWER IN
RESET
LINE IN
LINE OUT
REMOTE
TO H/U
ID NUMBER
25
25
25
Screw set
(N99-1752-05)
Screw set
(N99-1577-15)
Heat sink
(F01-1752-01)
Accessory
(W01-1606-05)
Cover
(F07-1140-12): KAC-X621
(F07-1141-12): KAC-PS621
Screw
(N07-0003-08)
Screw
(N09-4214-08)
Fuse (25A)
(F52-0014-05)
KAC-PS621/X621
2
BLOCK DIAGRAM
PREAMPLIFIER UNIT (X08-4150-10)
Ref. No
Application / Function
Operation / Condition / Compatibility
IC1
Infrasonic filter
IC3
Tone and volume variable
Controlled by microprocessor
IC4
6dB voltage amplification
IC5
HPF
LPF
IC6
Lch : 6dB voltage amplification
Rch : Signal 180 reverse and 6dB voltage amplification
IC7
LCD driver
Controlled by microprocessor
AUDIO UNIT (X09-5770-10)
Ref. No
Application / Function
Operation / Condition / Compatibility
IC1
Buffer
IC2
DC/DC converter
IC3
AMP communication buffer
COMPONENTS DESCRIPTION
IC1,10
ISO AMP
ISO AMP
ISF
ISF
HPF
HPF
BUFFER
BUFFER
LPF
CONTROL
MUTE
MUTE
AMP
CONTROL
AMP
POWER
AMP
POWER
AMP
IC1
IC5
IC4,6
IC3
Q101
Q107-135
OUT
IN
OUT
IN
L
R
OPERATION
IFS
FILTER
SENSITIVITY
AMP CONT
OUT-R
OUT-L
H/U COM
AMP COM
IC6
O.C. PROTE.
D.C. PROTE.
T.M. PROTE.
O.V. PROTE.
5V AVR
+15V AVR
-15V AVR
BATT
GND
P-CON
Q66
u-COM
Q61
Q62
FAN
DISP.
MO/ST
ON/OFF
HPF/OFF/LPF
5V-0.2V
ON/OFF
6dB
12dB
24dB
DC/DC CONV.
KAC-PS621/X621
3
Ref. No
Application / Function
Operation / Condition / Compatibility
IC5
H/U communication buffer
IC6
Microprocessor
IC7
Reset IC
IC9
Current detection
IC10
Isolation amplifier
Q50
5V AVR
Q51~54
DC/DC output driver
Q55~60
DC/DC drive (Final)
Q61
+15V AVR
Q62,63
-15V AVR
Q64,65
DC/DC converter (IC2) ON/OFF
Controlled by microprocessor
Q66,68
5V AVR
Q69
5V AVR ON/OFF
Q70,71
P-CON control
Q81
+15V AVR (Constant current)
Q91,92
DC/DC control
Q97
AMP communication stability power supply
Q101,102
Mute
Q103~112
A class first stage amplifier
Q113~118
A class 2nd stage amplifier
Q119,120
Final temperature compensation
Q121~124
Amplifier current detection (Current limiter)
Q125~132
Final driver
Q133~140
Final
Q141
Mute control
Q142~145
Shock noise prevention
Q146,147
AMP current detection
Q148,149
DC detection
Q249,250,263
ATT control
Synchronized with temperature detection
Q301~307
H/U communication output driver
Q310
H/U communication ON/OFF
Q313
H/U communication output driver
Q341~344
H/U communication input driver
Q346
H/U communication output driver
Q347~349
AMP and H/U communication ON/OFF control
Q351,352
BATT voltage output
Q353~358
Fan stability power supply
Q403
LCD backlight LED control
Q404
LED control
Q601,602
DC/DC drive (Final)
COMPONENTS DESCRIPTION
KAC-PS621/X621
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 : IC6)
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-PS621/X621
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