Alto Mac-2.3-Mk2, Mac-2.2-Mk2 Service Manual
MODEL: MAC2.2/2.3 MKII
www.altoproaudio.com
Version 1.0
CONTENT
1. INTRODUCTION……………………………………………………1
2. TECHNICAL SPECIFICATIONS…………………………………2
3. BLOCK DIAGRAM & SCHEMATIC DIAGRAM…………………3
4. PCB LAYOUT ………………………………………………………9
5. EXPLODED VIEW & PARTS LIST ……………………………… 15
6. BOM.........................................................................… ………… 17
1 INTRODUCTION
MAC2.2/2.3MK II is highly effective AMP with high power, providing
balanced input , Barrier strip for SP output ,as well as
STEREO/PARALLEL/BRIDGE/LIMT/30HZ filter functions .
The users can choose the respective inner protection measures and power supply to
avoid high temperature and short circuit.
2U body﹐big professional stereo power amplifier.
Wonderful tone quality and great volume level
Hard appearance and durable, it can be installed in cabinet or as a solo one.
The amplifier power :
MAC2.2MK II :
stereo output :350W*2(4ΩRMS), 750W*2(2ΩEIAJ)
bridge output: 710W(8ΩRMS), 1500 W*2(4ΩEIAJ)
MAC2.3MK II :
stereo output :550W*2(4 ΩRMS), 750W*2(2ΩEIAJ)
bridge output: 1150W (8ΩRMS), 1500 W*2(4ΩEIAJ)
Many controls on the rear panel:
the clip limiter SW
the filter switch :30HZ
Stereo / Double-single /Parallel or Bridge operation modes.
separate balanced signal input .
Connect speaker cable to output terminal of rear panel
Signal,clip ,protection ,power LEDs on the panel
Each channel ha s separate DC, heat protection and over-load circuit , protecting the
amplifier and speaker automatically.
2 TECHNICAL SPECIFICATIONS
POWER SPECIFICATIONS MAC2.2 MAC2.3
Stereo Mode
(Both channels driven)
20Hz— 20KHz
20Hz— 20KHz 4 Ohms(EIAJ) 1500W 2200W
ELECTRICAL SPECIFICATIONS
INPUT SENSITIVITY 1.15V(+3.4dBu)
INPUT IMPEDANCE 10kΩ Unbalanced 20kΩ Balanced
FREQUENCY RESPONSE
at 10dB below rated output power
VOLTAGE GAIN 30dB 32dB
DISTORTION(SMPLE-1M) ﹤0.03% ﹤0.03%
S/N ration 100dB 100dB
GENERAL SPECIFICATIONS
PROTECTIONS
2 Ohms(EIAJ) 750W×2 1000W
4 Ohms(RMS) 350W×2 510W
8 Ohms(RMS) 230W×2 285W
8 Ohms(RMS) 710W 1000W Bridge Mono Mode
25Hz— 25KHz +0/-1 dB
-3dB points:5 Hz— 50KHz
Full short circuit,open circuit,thermal,ultrasonic,and
RFprotection stable into reactive or mismatched
loads,turnON/OFF,muting,tried crowbar
CONTROLS
INDICATIORS SIGNAL:2 green LEDs CLIP:2 red LEDs
CONNECTORS INPUT:Active balanced XLR and 1/4 ”(6.3mm)TRS
POWER SUPPLY Available for 110-120V or 220-240V AC,50/60Hz
DIMENSIONS 483(W)*460(D)*88.8(H)mm
WEIGHT 13.6kg 15.6kg
Front:AC switch,Input level control for each channel
Rear:stereo/parallel/bridged selector,30Hz filter
selector clip ON/OFF selector
POWER:1 blue LED PROTECTION:1 red LED
OUTPUT:touch-proof binding posts and speakon
jacks
4321
MAC2.2/2.3MKII (1/1)方框圖
D
CH.A INPUTS
XLR
PREAMP
MAC2.2/2.3MKII SYSTEM BLOCK DIAGRAM
PROTECT
SIN PROTCLIP
CH.A PWRAMP
D
CH.A
SPKR
CH.A OUTPUTS
C
SIGNAL SMART
SENSITIVITY
OUT
C
PROTECTION
STEREO:
INPUT ATO CH.A.INPUT B TO CH.B
CH.B INPUTS
BRIDGE
INPUT A TO MONO BRIDGED
SENSITIVITY
PROTECTION
BRIDGE
PARALLAE
INPUT A TO MONO
XLR
B
CH.B OUTPUTS
PREAMP
CH.B PWRAMP
CH.B
SPKR
B
OUT
SIN PROTCLIP
PROTECT
Titel
A
1 2 3 4
MAC2.2/2.3MKII SYSTEM BLOCK DIAGRAM
Size
A3
Date:
File:
Model No:
MAC2.2/2.3MKII
02-Nov-2007
AC2.2/2.3MK II方框圖
Sheet
Drawn By:
Revision
1 1
VER071102
of
JJZ
A
4321
MAC2.3MKII VRL_VER071102 (1/1)
J1
10
CN4
1
2
3
4
CON4P
CN5
1
2
3
4
CON4P
PA
SLA
TO AMP CHA
SINA
PB
SLB
TO AMP CHB
SINB
D
C
D
+15V
GND1
1
2
CN1
S1A
S2A
GND
S3B
S2B
S1B
1
2
3
1
2
3
4
GNDD
CN2
TO INPUT
C
S1A
S2B
S1B
+12V
GND
GA
S2A
GB
S2B
SLA
4
DC12V 8P
3
RY1
5
8
13
VR2
7
6
+12V
1
D3
1N4148
2
A K
Q9
C1815
2
S2B
S3B
10K
13
VR1
10K
GA
R40
10K
C9
10UF/50V
2
S2A
GND
LED2
R41
8.2K
PR RED
S2A
S3B
GA GND
R1
20K
GA
SLB
GB GND
R2
20K
CN3
GND
GB
GND
GB
J2
5
GNDGND
+12V
R7
R14
1k
4.7K
R44
C5
1UF
R18
4.7K
+12V
R13
10K
R9
1M
100R
C1
B
LED1
power led
SLA
10UF
R3
8.2K
R11
68K
Q1
C1815
Q2
C1815
R25
C7
10UF
R26
51K
10k
GND
C2
D1
IN4148
GND
1UF
GND
C3
SLB
Q7
2N5401
R22
3.9K
S2A
LED3
CLIP RED
GND
4.7K
D5
IN4148
R17
Q3
C1815
GND
R6
2.2k
LED4
SIG GRN
R4
8.2K
GND
R10
1M
R12
68k
C4
1UF/25V
R15
1k
Q4
C1815
D2
IN4148
10UF/25V
GND
R19
4.7K
R24
100R
Q5
C1815
Q8
2N5401
R20
C6
4.7K
1UF
C8
12
R5
10UF
R16
51K
R23
3.9K
D6
IN4148
S3B
LED6
CLIP RED
R8
2.2k
LED5
SIG GRN
B
10k
GND
R21
4.7k
Q6
C1815
GND
A MAC2.3MKII VRL
Titel:
Size:
Date:
File: Drawn By: JJZ
Model No:
A4
02-Nov-2007 Sheet:
MAC2.3MKII VRL.SCH
MAC2.2/2.3MKII
1 2 3 4
Revision:
1 1
of
A
VER071102
4321
J1
250
D
J2
250
C
CN4
5
4
3
2
1
CON5
B
R1
0.22/2W
R2
0.22/2W
2
A K
F3
12A
F2
12A
V+
3
AC2
V-
AC1
KBP206G
1
C4
2200UF/25V
D6
IN4007
D7
IN4007
BR2
GND
4
4
+17V
C1
CL10
V-
CL10
GND
C14
1
CL10
AC1
V+
AC2
C2
C3
2200UF/25V
KBPC2504
3
Vin
2
BR1
C15
CL10
D5
IN4007
100UF/16V
U37815
Vout
GND
C16
C17
D8
IN4007
0.1u/250v
10000uF/80V
0.1u/250v
10000uF/80V
100UF/50V
R7
10K1/4W
C33
C18
C25
ZD1
C26
R8
10K1/4W
Q6
C2383
C5
0.1u/250v
C6
0.1u/250v
IN4744
250
250
250
250
250
250
250
GND
J3
J4
J5
J6
J7
J8
Q4
A1013
Q5
2SA1837
Q3
2SC4793(
J9
ZD2
IN4744
C27
220UF/25V
CN1
4
3
2
1
CON4
CN3
4
3
2
1
CON4
-15V
+15V
C28
GND
220UF/25V
GND J20
+16V
CN5
-15V
5
GNDD
4
+15V
3
+16V
2
GND1
1
CN5P2.54-180
GND GND
NTC1
NTC2
+17V
NTC1
NTC2
+17V
TO AMP-CN7
8MM
MAC2.3MKII POWER_VER071102(1/1)
D
C
B
C30
0.1UF/100V
NTC1
NTC2
C35
10UF
GND
0.1
CN6
1
FAN1 FAN2
2
CON2
CN12
CON2
1
2
Titel:
MAC2.3MKII POWER
Size:
Model No:
A4
Date:
MAC2.3MKII POWER.SCH
File:
MAC2.2/2.3MKII
02-Nov-2007 Sheet:
Drawn By:
A
Revision:
VER071102
1 of 1
JJZ
Vout
GND
R9
1k
C31
220UF/35V
3
R10
0
C29
470UF/25V
U4
LM317
1
R11
0.22
C34
A
1 2 3 4
BR3
KPB206G
470u C36
Vin
2
87654321
GNDGND
MAC2 3MKII INPUT_VER071102 [1/1]
R2
C2
3 30K
470P
2
2
3
MIC1
D
CH1 IN
C
3
1
1
HCSM-94M007P1
HCSM-94M
C3
470P
6MIC3
5
4
3
2
1
GND GND
GND
R7
10K
R8
10K
R6
3 30K
7
8
3
2
GND
U1A
4580M
C18
22P
R9
10K
C6
0 1
U2A
LM13600
R14
10K
11
6
R38
150K
5 2
1
R28
39K
R42
100R
R40
270
GND
C22
10U
8 20K
R43
100R
C8
0 1
1
+14V
3
_
+
4
C7
0 1
C34
45U/25V
R10
2 2K
R30
Q1
2N3906
GND
-14V
SW1
BR
C28
S1F S2F
0 15UF
R32
4 7K
312
GND
R34
20K
SW3A
CILP
C29
0 15UF
R16
0 0R
GND
R35
20K
GND
R11
1 8K
GND
R12
10K
3
U3A
R13
15K
C1922P
R4
10K
4580M
D1
IN4148
D3
IN4148
C1
22P
U4A
1
4580m
2
1
2
3
C14
10UF
A K
R1
10K
R3
10K
C24
10U
LED1
LED-3
GND
D2
IN4148
D4
IN4148
7
U4B
4580M
R23
680R
GND
D
CN-3P-180
CN1
6
5
GND
GND
CN3
CN-2P-180
1
2
3
4
3
2
1
1
2
S1A
GNDD
S2A
S1B
S2B
S3B
G
+12V
GND1
TO VRL
CN2
CN-4P-180
C
GND
R17
3 30K
R19
10K
GND
9
R18
3 30K
R20
10K
0
4
2
SW2
FILTER
B
A
CH2 IN
MIC2
MIC4
2
1
HCSM-94M007P1
HCSM-JY6351
1 2 3 4 5 6 7 8
1
3
5 6
3
2
3
1
C5
470P
GND
GND
C4
470P
GND
CN6
7
6
5
4
3
2
1
CN-7P-180
CN5
7
6
5
4
3
2
1
CN-7P-180
S1F
S3F
S2F
S4F
GND
1 2
5
4580M
6
C20
22P
R21
10K
U2B
12 15
16
LM13600
R26
10K
R39
150K
U1B
3 4
5 6
7 8
9 10
11 12
13 14
15 16
7
14
_
+
13
GND
+14V
C35
45UF/25V
C9
0 1
R29
39K
R44
100
R41
270
-14V
C25
10U
R31
8 20K
R45
100
R22
2 2K
Q2
GND
4
C30
S3F S4F
0 15UF
R33
R36
4 7K
2N3906
5
6
20K
R27
0 0R
SW3B
CILP
GND
C31
0 15UF
R15
1 8K
GND
GND
+14V
-14V
R5
0R
R37
20K
U1C
4580M
4 8
GND
R24
10K
U3B
+
5
4580M
6
_
7
R25
15K
C2122P
D5
IN4148
D6
IN4148
U3C
4580M
4 8
C15
10UF
C27
10U
A K
U4C
4580M
4 8
LED2
LED-3
D7
IN4148
D8
IN4148
C10
0 1
C11
0 1
C12
0 1
C13
0 1
R46
680R
GND
C36
100U
C37
100U
Titel
Size
A3
Date:
File:
CN4
CN-5P-90
1
GND
2
+12V
3
+15V
4
5
TO POWER
GND
-15V
MAC2.3MKII INPUT
Model No:
MAC2.2/2.3MKII
02-Nov-2007 Sheet
MAC2.3MKII INPUT.SCH
Revision
of
1 1
Drawn By: JJZ
B
A
VER071102
87654321
D21
1N4007
Q12
22uF/100V
R44
10K
C7
R32
2K7
CN3
C4
PRO SW
NO 85度
C4832
Q4
MJE350
Q19
MJE350
Q20
MJE340
C5
22uF/100V
C24
22uF/100V
1
2
R66
4 7K
ZD2
1N4753 36V
ZD3
1N4753 36V
R48
887R
R31
2K7
1N4753 36V
Q15
A1668
D20
1N4007
470P/1KV
ZD5
1N4753 36V
C21
ZD4
R68
4 7K
D13
4148
C19
47u-16v
C20
C11
224
D12
4148
Q5
MJE340
R17
200
D7
4148
D6
4148
R18
200
Q22
MJE350
470P/1KV
R24
100k
ZD7
5 1V
R122
82K
CE
Q6
2SC4382
GND
R7
10R-2W
R49
10R-2W
Q23
2SA1668
Q21
D667
R51
8 87K
R50
8 87K
PA
Q30
R60
5 6K
C5200
D28
1N4004
R58
100R
R61
0 22R/5W
R53
0 22R/5W
Q24
A1943
B
C15
102
Q11
R45
5551
10k
R46
Q14
10k
5401
C16
12
102
A
R37
1K
Q29
2N5551
D27
1N4004
Q9
C5200
R54
0 22R/5W
R55
0 22R/5W
Q25
A1943
4
4
3
3
OUT
2
1
P3
SP
250
RY1
2
1
HEM-DC12V12-5P
Q8
2SC5200
R56
0 22R/5W
R57
0 22R/5W
Q26
A1943
GND
C18
22U/25V
+18V
Q7
C5200
R52
0 22R/5W
R63
0 22R/5W
Q31
A1943
Titel:
22UF/100V
+50V
R35
10K
R15
0R
C6
D
CN1
2 54 3P
R28
R70
47K
6 2K
4
3
2
1
PA
R71
47K
C1
R33
4 7u-16v
20K
G
100p
C9
MOUNT (JUMP OR OE RESISTOR)
SP
C
Q30, Q9,Q7,
C5200
Q31, Q26Q25,
A1943
R61,R56,
R52,
0.22R/5W
B
R57,R63
R28 9 09KO 6 2KO
5V 5V
ZD1
+50V
MOUNT (JUMP OR OE RESISTOR)
MAC2 3MAC2 2
Q30, Q8,Q9Q7,
Q24,Q25,Q26,
Q31
R61,R54,R56,
R55,
R52,R53,R55,
R57, R63
8 87KR50,R51 909KO
ZD1
43V
GND
22UF/100V
ZD1 2.2K改插 的電阻
R27
C10
10k
224
R34
A
68k
D5
4148
ZD6
10V
GND
Q13
5401
R21
100k
A
C22
1uF/25V
C17
D1
4148
R3
1K
D2
4148
R1
39k
R11
100
Q16
2SC2240
R39
47
R2
39k
D10
4148
R5
1K R6
D11
4148
D13_2
C8
22uF/50V
Q10
5551
GNDGND
R38
47
Q2
A970
B
R23
100K
R62
47K
R8
300
R42
6K8
Q1
5401
R43
6K8
R9
300
Q18
5551
R4
1K
C2
221/1KV
Q17
2SC2240
R40
47
R41
47
Q3
A970
C3
221/1KV
1K
Q27
2N5551
C23
22uF/100V
R10
100
C12
33P
C14
10p
C13
33P
R12
100
G
R14
68
Q28
2N5551
R13
68
220u/16v
R47
330
Size:A3Model No:
Date:
1 2 3 4 5 6 7 8
File:
MAC2.3MKII AMP_VER081022 (1/1)
+90V
C25
0 1UF/250V
D29
IN4007
GND
TO A
A
R65
680
CN2
1
2
3
4
CON4
MAC2 3MKII AMP
Q32
5551
R64
10K
TO B
B
R58
2 7
C17
0 0068
D30
IN4007
GND
C26
0 1UF/250V
TH1
NTC-10K
NTC1
GND1
+18V
MAC2 2/2.3MKII
22-Octo-2008 Sheet:
MAC2 3MKII AMP.SCH
NTC2
R59
10
L1 1 1UH
-90V-50V
Drawn By:
P1250
P2250
+90V
OUT
-90V
Revision:
1 of 1
JJZ
P4 250
D
C
B
P5250
A
VER081022
D
4321
C
B
A
CHB-PU-2
VER021004
Revision
MAC2.4 MKII
DECHUN QIN
Drawn By:
CHB NPUT.SCH
A4
Titel
Size Model No:
Date: 19-Nov-2007 Sheet 1of1
File:
C4 470P
2
CH2
FILTER
C3 470P
3
1
T
R
CH22
CN3
TO CN4
7
6
5
4
3
2
1
S
1 2 3 4
D
C
B
A
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