Alto A400.4 Dragonfly User manual

www.altoproaudio.com
Version 1.0
MODEL: A400.4

CONTENT
1. Introduction.............................................................................................1
2. Specification............................................................................................2
3. Block Diagram.........................................................................................3
4. Schematic Diagram.................................................................................4
5. Wiring Diagram......................................................................................10
6. Printed Circuit Board..........................................................................11
7. Exploded View & Mechanical Parts List..................................................13
8. Electrical Parts List.............................................................................15

1. Introduction
˙1.5U 1/2 rack, multi-channel high power amplifier.
˙Fantastic audio quality even with extremely high volume levels.
˙Solid and durable, can be mounted into a cabinet.
˙User-controllable clip limiter.
˙4×120Watts on 4 ohms (EIAJ)
˙Balanced XLR inputs and 1/4” TRS jack to ensure noiseless long wiring.
˙1/4”TS jack for sp-output.
˙Front panel LED indicators for signal, limit and clip.
˙Accurate gain control
˙Independent thermal overload protection on each channel automatically
protects amplifier and speakers.
˙Single channel over-heat protection.
- 1 -

2. Specification
8 ohms per channel(EIAJ)
4 ohms per channel(EIAJ)
4 ohms per channel(RMS)
A400.4 DRAGONFLY
20Hz [email protected]%THD, Stereo Mode
MODEL
Controls FRONT: Power switch, LEVEL knobs
REAR: Four LIMITER Switches for channel 1- channel 4
Indicators (per channel)
Power-On: Green LED
Clip: Red LED
Limit: Yellow LED
Signal: Green LED
Connectors of each channel Input: COMBO connector
Output: 1/4" TS jack connector
Power Supply 190-240 Vac~50Hz / 95-120Vac~60Hz
Dimension
Net Weight
65W
120W
(at THD:1%)
3.8Kg
314mm x 208.5mm x 66.6mm
Input Sensitivity @4 ohms +3dBu
62W+3W
- 2 -

1 2 34
A B C D
4
321
D
C B A
CH1 CH2 CH3 CH4
PRE-AMP
D100W
AMP
D100W
AMP
PM8PWR
POWER SUPPLY
A400.4
BLOCK DIAGRAM
- 3 -
3. Block Diagram

1 2 34
A B C D
4
321
D
C B A
1
2
CN11 CON2
1
2
CN12 CON2
1
2
CN13 CON2
1
2
CN14 CON2
1
2
CN15 CON2
1
2
CN16 CON2
1
2
CN17 CON2
1
2
CN18 CON2
CH1_SP+ CH1_SP-
CH2_SP+ CH2_SP-
CH3_SP+ CH3_SP-
CH4_SP+ CH4_SP-
1
2
3
4
5
6
X1
X2
X3
CN1 CN-BAL-COMBI
1
2
3
4
5
6
X1
X2
X3
CN2 CN-BAL-COMBI
1
2
3
4
5
6
X1
X2
X3
CN3 CN-BAL-COMBI
1
2
3
4
5
6
X1
X2
X3
CN4 CN-BAL-COMBI
1
2
3
CN5 CON3
1
2
3
CN6 CON3
1
2
3
CN7 CON3
1
2
3
CN8 CON3
1
2
3
4
CN9 CON4
1
2
3
4
CN10 CON4
1
2
3
SW1A SW PS-22E85L
4
5
6
P
SW1B SW PS-22E85L
1
2
3
SW2A SW PS-22E85L
4
5
6
P
SW2B SW PS-22E85L
1
2
3
SW3A SW PS-22E85L
4
5
6
P
SW3B SW PS-22E85L
1
2
3
SW4A SW PS-22E85L
4
5
6
P
SW4B SW PS-22E85L
CH1 CH2
CH3 CH4
3c
5e
1a
4d
2b
PJ1 PHONEJACK5 (5-PIN)
3c
5e
1a
4d
2b
PJ2 PHONEJACK5 (5-PIN)
3c
5e
1a
4d
2b
PJ3 PHONEJACK5 (5-PIN)
3c
5e
1a
4d
2b
PJ4 PHONEJACK5 (5-PIN)
C1 100P
C2 100P
C3 100P C4
100P
C5 100P C6
100P
C7 100P
C8 100P
C9 100P C10
100P
C11 100P C12
100P
TP1 TP-2
- 4 -
4. Schematic Diagram

12345678
A B C D
8
7654321
D
C B A
C11
56pF/50 cer
R5
10K
GND
CH1 GAIN
C6
100pF/50 cer
C9
47uF/25V
C5
100pF/50 cer
C2
22uF/50V
GND
C1
22uF/50V
3 21
U1A NJM4580L
5 67
U1B
NJM4580L
GND R9
10K
GND
R1 15K
R4 10K
R3 10K
R2 15K
1 2 3
CN1 CON3
GND
CH1-IN
R6 17K4
41
2 3
U2
VTL
C12
56pF/50 cer
R12
10K
GND
CH2 GAIN
C7
100pF/50 cer
C10
47uF/25V
C8
100pF/50 cer
C4
22uF/50V
GND
C3
22uF/50V
3 21
U3A NJM4580L
5 67
U3B
NJM4580L
GND R13
10K
GND
R7 15K
R8 10K
R11 10K
R10 15K
1 2 3
CN2 CON3
GND
CH2-IN
R14 17K4
41
2 3
U4
VTL
84
U3C
NJM4580L
84
U1C
NJM4580L
84
U5C
NJM4580L
3 21
U5A
NJM4580L
5 67
U5B
NJM4580L
C13
56pF/50 cer
C14
56pF/50 cer
C15 104P C16 104P
C17 104P C18 104P
C19 104P C20 104P
R25 10K
R26 82K
R27 10K
R29 82K
R28 10K
R30 10K
GND
GND
1 2 3
CN4 CON3
GND
+15V
-15V
1 2 3
CN6 CON3
CH2-OUT CH1-OUT
C30
56pF/50 cer
R35
10K
GND
CH3 GAIN
C28
100pF/50 cer
C29
47uF/25V
C27
100pF/50 cer
C24
22uF/50V
GND
C23
22uF/50V
3 21
U6A NJM4580L
5 67
U6B
NJM4580L
GND R39
10K
GND
R31 15K
R34 10K
R33 10K
R32 15K
1 2 3
CN9 CON3
GND
CH3-IN
R36 17K4
41
2 3
U7
VTL
C34
56pF/50 cer
R42
10K
GND
CH4 GAIN
C33
100pF/50 cer
C44
47uF/25V
C32
100pF/50 cer
C26
22uF/50V
GND
C25
22uF/50V
3 21
U8A NJM4580L
5 67
U8B
NJM4580L
GND R43
10K
GND
R37 15K
R38 10K
R41 10K
R40 15K
1 2 3
CN10 CON3
GND
CH4-IN
R44 17K4
41
2 3
U9
VTL
3 21
U10A
NJM4580L
5 67
U10B
NJM4580L
C31
56pF/50 cer
C35
56pF/50 cer
R55 10K
R56 82K
R57 10K
R59 82K
R58 10K
R60 10K
GND
GND
1 2 3
CN12 CON3
GND CH4-OUT
CH3-OUT
84
U8C
NJM4580L
84
U6C
NJM4580L
84
U10C
NJM4580L
C36 104P C37 104P
C38 104P C39 104P
C40 104P C41 104P
GND
C42 220u/25V C43 220u/25V
R21 82R
CLIP SIG LIMITER
R22 30R
R19 180R
VR1 A10K
1 2 3 4
CN3 CON4
R24 82R
CLIP SIG LIMITER
R23 30R
R20
180R
VR2 A10K
1 2 3 4 5
CN8 CON5
1 2 3 4 5
CN5 CON5
R15 270R
R17 270R
R51 82R
R52 30R
R49 180R
VR3 A10K
1 2 3 4
CN7 CON4
R54 82R R53 30R
R50
180R
VR4 A10K
1 2 3 4 5
CN13 CON5
1 2 3 4 5
CN11 CON5
R45 270R
R47 270R
CLIP SIG LIMITER CLIP SIG LIMITER
GND
GND
GND
GND
- 5 -

1 2 34
A B C D
4
321
D
C B A
LED1 RED
LED3 GR
LED2 YEL
1
2
3
4
5
CN1 CON5
LED4 RED
LED6 GR
LED5 YEL
1
2
3
4
5
CN2 CON5
- 6 -

12345678
A B C D
8
7654321
D
C B A
IC4 7815 IC2 7915
C16 100N C14 100N
C25 100N
C12 470N C13 470N
C9 180U/25V
C30 100U/25V C26 100U/25V
C21 2200U/25V
C20 2200U/25V
C24 2200U/25V
C23 2200U/25V
C22 2200U/25V C19 2200U/25V L5
1uH/12A
L6
1uH/12A
D1 KBU8M C7
470U/200V
C8 470U/200V C36 470U/200V C37
470U/200V
C2 2N2/400V C3
2N2/400V
C38 2N2/400V C39
2N2/400V
L2 1uH/12A L3 1uH/12A
R13 150K R14 150K
C1 14D391K
R2 NTC_B57237
CX2 1u/275V
R1 845K
R4 845K R3
150K
1 2 3 4 5 6 7 8 9
10
J1 CON10
1 2 3 4
J2 CON4
Q2 BC640
R8 6R80
D7 BZT03-C16
D2 BYV27-150
D8 BYV27-150
C5 100N
IC1 L7812CV
C4 330U/25V C6
100U/25V
P1 P
P3 P P2 P
A2A1
G
Q1 BT139
M2 STW9NK90Z
D12A 30CPQ150
D12B 30CPQ150 D9B 30CPQ150
D9A 30CPQ150
3 4
1 2
T1 PE67100
1
3
2
4
L1 TL25-050-182
R11 75R0 R12 150R
R6 270R R5 270R
R10 2K2
D4 1N4148
D5 GR
24
L4A LF20_13EED
911
L4B LF20_13EED
12 10
L4C LF20_13EED
1315 L4D
LF20_13EED
16 14
17
L4E LF20_13EED
2 3 4 5 7
8 10 12 13 14 15 17
1
T2
TF20_13EED
1 2
K1 CON2
1 2
K4 CON2
V27NY V27N
V27NY
V27N GND
GND
V15A V15N
V27NFB
V27NFB
C10 470P/500V C11 470P/500V C41 100N
R9 10R/30W
GND
1 2 3 4 5 6 7 8 K2 CON8 1 2 3 4 5 6 7 8 K3 CON8
GND V27N
V27NF
V27NF
V15N V15A
GND V27NF
1 2 S1 CON2
R15 1R8
AC_INPUT
AC_SEL
PMPWRCTL_BOARD
GND 1
2 3 CN4 CON3
V27N V27NF R20
12R/10W R21 12R/10W
C47 180U/25V
C48 100N
D3 1N4007
C49 100N
CX1 0.47u
R7 1M
1
3
2
4
L7 TL25-050-182
CY1 222P CY2 222P
R0 10K
ADD R0 20060120
- 7 -

12345678
A B C D
8
7654321
D
C B A
C20
10U/16V
C22
10U/16V
C23 2200U/35V C24 2200U/35V
R27 5K60 R26 5K60
C28 560P IN1-
4
IN1+
5
SGND1
2
OSC
7
MODE
6
IN2-
9
IN2+
8
SGND2
11
FB1 20
SW1 24
REL1 23
ENA1 21
DIACUR 22
DIATEMP 15
STABEX 18
STABINT 19
ENA2 16
REL2 14
SW2 13
FB2 17
VDD1 3
VDD2 10
VSS1
1VSS2
12
U6
TDA8929
C31 0.1uF/100V
GND
GND
MUTE
+25C
-25C
R28 1K0
C48 220N
-25C C59
1N
C49 220N
SW2
17
REL2
16
ENA2
14
VSTAB
9
POWUP
15
DIAG
3
ENA1
4
REL1
2
SW1
1
BOOT2 12
OUT2 11
BOOT1 6
OUT1 7
VSS1
8VSS2
10
VDD1 5
VDD2 13
U8
TDA8927
-25
+25
C40
22N
C41 22N
C29 560P
C32
560P
C30
560P
C33 560P
C151
2N7 COG C18
470N MKT
C152 2N7 COG C21
470N MKT
C50 0.01uF
C61
470N
C62
1N(NPO) C110
10N(NPO)
C105
100U/35V LOW ESR
C106
100U/35V LOW ESR
R39
5R60 R40
5R60
R41 5R60 R42
5R60
R63 100R R64 100R
R65
47R 1/4W
R66 47R 1/4W
L3
TWKC-22UH
L4
TWKC-22UH
L10
TWKC-22UH
L11
TWKC-22UH
+25 -25 +25 -25
GND GND GND GND GNDGND CASE
TE6
GND
+25C
-25C
C5
470N
C6
0.1uF/100V
C7
470N
C45
220N
C46
NOT USE
C47
220N
GND GND
+25
-25
C60 470N C55 0.1uF/100V
TE7
C8 220N
C9 NOT USE
C10 220N
-25
R31 27K
C34
220N
-25C
R1 56K
D8 ZD5.6
+25C
GND
MUTE
+25
-25
L1
ferrite bead
L2
ferrite bead
TE1
C16 0.1uF/100V
-25C
GND GND
C4 0.1uF/100V
TE3 +VCC
TE4 GND
TE5 -VCC
C56 0.01uF C64
1N(NPO)
C111 10N(NPO)
R68 47R 1/4W
R70 47R 1/4W
GND
GND
CASE
C14
10U/16V
C15
10U/16V
R3 5K60 R2 5K60
C3 560P
GND
TE2
1 2 3
CN1 CON3
L5
ferrite bead
L6
ferrite bead
C1 0.1uF50V C2 0.1uF50V
TE8
C13 10N(NPO)
- 8 -