Alto_MAC2.2,_2.3,_2.4_Power_Amp_Service_Manual.pdf

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MODEL: PS 4LA
MODEL: MAC2.2/2.3/2.4
www.altoproaudio.com
Version 1.0
CONTENT
1. Introduction……………………………………………………………2
2. Specification………………………………………………………..…2
3. Block
Diagram…………………………………………………….…..3
4. Schematic
Fiagram………………………………………………..…4
5. Wiring
Diagram…………………………………………………..….14
6. PCB
Layout…………………………………………………….........17
7. Test
Procedure
and
Test Result………………………………....28
8. Exploded
Views
&
Mechanical Parts List………………….......30
9. BOM…………………………………………………….………….....36
1
1. Introduction
1.1
1.2.
1.3.
1.4.
1.5.
The stereo amplifier apparatus specialization in the performance, have versatility-changed
output (stereo, parallel and bridged selector), you will hear excellence music.
Input matching allows collection with any preamplifier
Excellent frequency echo and sound quality
XLR unbalanced and 6.3ф jack output.
High-speed and low noise fan for releasing heat. When the temperature rises, the fan
automatically switches to high- speed, it re-back to normal speed at other times to reduce
power consumption
The apparatus have changed limited overload function, when it turns on the apparatus
most output.
Status indicators of SIG and CLIP. When there is any signal added, the SIG LED lights up.
When there is overload, the CLIP LED lights up. If anything abnormal happens to the
circuits, the CLIP LED will be continuously on, with no action from the circuits. This helps
the user to determine which status it is in. .
Power supply of steady circuit adopted to unaided voltage output of highly cabinet.
Output jack specialization in female speaker jack.
1.6.
1.7.
1.8.
1.9.
2.
Specification
MAC2.3
MAC2.4
800
1400
450
750
310
575
900
1500
1400
2500
900W
1500W
1.15V(+3.4dBu)
10KΩ unbalanced 20KΩ balanced
25Hz~25KHz +0/-1dB-3dB points:5Hz~50KHz
30dB
32dB
34dB
<0.03%
100dB
600W
900W
1500W
Full short circuit, open circuit, thermal, ultrasonic, and RF
protection stable into reactive or mismatched loads, turn
ON/OFF, muting, tried crowbar.
Front: AC switch 40-detect input level control for each
channel.
Rear: stereo/parallel/bridged selector, 30Hz filter selector
clip ON/OFF selector.
Power specifications
Stereo mode (both channels 2Ohms
4Ohms
driven )20Hz~20KHz
8Ohms
Bridge mono mode 20Hz~KHz 8Ohms
4Ohms
Electrical Specifications
Input sensitivity
Input impedance
Frequency response (at 10dB
Voltage Gain
Distortion (smpte-1m)
Signal to noise ratio
General specification
Protections
MAC2.2
480
300
205
560
800
600W
Controls
Indicators
Connectors
Power supply
Dimensions
Weight
Signal: 2×green LED
CLIP:2×red LED
Input: Active balanced XLR and 1/4”(6.3mm)TRS
Available for 110-120V or 220~240VAC,50/60Hz
483(W) ×400(D) ×88.8(H)mm
14.4kg
16.5kg
19.02kg
2
1
2
3
4
D
D
C
C
B
B
3. Black Diagram
A
Title
Size
A4
Date:
File:
1
2
3
A
Number
Revision
16-Sep-2004
D:\PSA-3000\PSA-3000
.DDB
Sheet of
DrawnBy:
4
3
4. Schematic Diagram
1
2
3
4
5
6
7
8
CHANNEL-A
D
D
R22
PSA3600-R
A1
6.8-1W
CN1:12
NC
CN1:12
P1
CN1:13
NC
NC
CN1:13
R21
SP_A
+VCC_A
R20
1.5K
^R_0805
Q10
1N4148 D7
R19
2.4K-3W
+67V
+VCC_A
R7
47K
^R_1206
D5
1N4148
10K
^R_0805
Q9
2SC2412K
be modify
CN1:5
CN1:5
CN2:2
CN1:2
R11
22-1W
R8
0.2-5W
Q1
2SA1943
R9
0.2-5W
Q2
2SA1943
R10
0.2-5W
Q3
2SA1943
D1
1N4004
C21
180P
^C_0805
R48
10K
^R_0805
R46
10K
^R_0805
C
P1
2SC2412K
TO LED 2(SIG A)
CN1:7
CN2:7
+15V_A
CN2:1
CN1:1
R45 1K
3
^R_0805
2
A1
U2-A NE5532
C27 10U
1
CN1:6
CN1:6
CN2:5
CN1:5
P1
be modify
R41
10K
^R_0805
R44
10K
^R_0805
180P
C20
^C_0805
TO VR1(VOL)
R59
390K
^R_1206
R56
270
^R_0805
C26
0.22U
C18
220U
ZD5
15V 1N4744
P1
CN2:6
CN1:6
C5
0.001U
^C_1206
R6
47
^R_0805
R24
820
^R_1206
ZD2
5.6V-1/2W
D13
D9
1N4937
CN1:7
CN1:7
D8
1N4937
C7
0.0022U
^C_1206
1N4148
Q4
15032
D3
1N4148
4700U/80V
C1
C
FILT-CAP A
FILT-BYP A
C22
^C_0805
56P
8
U2-B
NE5532
D12
7
R1
VR3
3.3K
VR2
3.3K
C8
0.0033U
R12
6.8-1/2W
P1
R4
820-3W
C4
0.022U
R5
820-3W
T1
2UH
5.6-2W
+SPK
FILT-SEND A
C17
CN104
1
3
5
7
9
11
13
15
17
19
21
23
25
2
4
6
7
8
5
8
10
12
14
16
18
20
22
24
26
-14V
1
2
4
C25
+14V
C24
5
6
D13
D14
1N4148*4
^C_1206
0.1U
CN1:4
E200 JP15
BR_POS
U1A
3
11
R61
39K
^R_0805
R47
7.5K
^R_0805
0.15
0.15
R51
R31
R57
20K
20K
4.7K
^ R _ 0 8 0 5^ R _ 0 8 0 5^ R _ 0 8 0 5
A1
be modify
ZD6
CN2:4
15V 1N4744
C19
220U P1
-15V_A
D15
TO LED1(CLIP A)
4
VR1
100
C9
R13
0.0033U 6.8-1/2W
J203+
1+
1-
2+
2-
CN2:3
R23
C6
0.022U 90
C3
0.068U
CN1:3
D10
1N4148
Q5
15033
R2
R3
J203-
12-3W 12-3W
D4
1N4148
4700U/80V
C2
P1
E112
-SPK
P1
E201 JP16
SPEAKON
LM13700
C16
+VCC_A
BR-RET
BR_BAL
B
BR-CUT
F-BYP-B
F-30-B
CLIP-B
-IN B
R40
10K
^R_0805
R73
R49
100
0.1-50V
100
^ C _ 1 2 0 6 R _ 0 8 0^ R _ 0 8 0 5
^
5
A1
R39
R38
150K
R26
100
^R_0805
P1
6
CN1:10
R42
820
^ R _ 1 2 0 6 CN1:10
ZD1
5.6V-1/2W
R22
820
^R_1206
BR_NEG
B
R53
150K
^R_1206
F-SND-B
270
C14 ^ R _ 0 8 0 5
100UF
C9
0.1-50V
^C_1206
CN1:4 CN1:4
Q11
HMBT5401
R52
150K
^R_1206
D6
1N4148
Q6
2SC5200
Q7
2SC5200
Q8
2SC5200
+IN B
A1
TO TH2
TH_A
C23
56P
^C_1206
R18
2.4K-3W
R14
22-1W
R15
0.2-5W
R16
0.2-5W
R17
0.2-5W
D2
1N4004
SW TO GND FOR CLIP LIM
be modify
BR MONO FEED
A1
R32
A1
1K
^R_0805
R50
270
^R_0805
R54
10K-1%-1/2W
-67V
R55
9.09K-1%-1/2W
-VCC_A
GND
-VCC_A
CN1:11
CN1:11
BR_BAL
R58
SP_A
33K
^R_1206
R60
3.3K
^ R _ 0 8 0 5 P1
R24
33K
^R_1206
A
A
PSA3600(MAC2.2) Schematic Diagram 1 of 4
Channel-A
1
2
3
4
5
6
7
SP_A
Title
PSA-3000
Size
D
Date:
File:
Number
Revision
Sheet of
Drawn By:
8
PSA3600-L
17-Sep-2004
D:\MAC\PCB
.ddb
1 4
DingNianCong
4

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