Alto Mistral-6000 Service Manual
Service
MODEL: MISTRAL 6000
www.altoproaudio.com
Version 2.0
CONTENTS
1. Introduction..………………………………………………………….………………..2
2. Specification.…………………………………………………………….……….…….3
3. Schematic Diagram…………….…………………….……….….…………………....4
4. Wiring Diagram..……………….…………….………...…….………………….……11
5. PCB Layout……..……………….…………….………...…….………………….…...13
6. Test Procedure…………..……………………….………………………….……......18
7. Exploded Views & Mechanical Parts List……….......……………….…………...20
8. BOM.……………………………………………………………………..………………23
1
1. Introduction
ALTO MISTRAL amplifiers are series of innovative design power amplifiers. This series work under high
stability with great power supply in just 2-rack spaces. Airflow is from back to front panel to keep in a nice air
circulation inside the Rack. The automatic fan, which affects the temperature of machine includes various
kinds of speed, therefore, this low-noise fan makes a good result in cooling the heat from machines. MISTRAL
amplifiers include 2 independent channels with separate protection system and power supply. The
independent protection system avoids opening circuit, short, and wrong loading or over-heating. The specialdesigned protective system applies automatically restarting functions upon the default status and then goes
back to normal. All electronic inputs equip standard power connectors. And all inputs are electronic balanced,
with hi-quality transformer, MISTRAL amplifiers provide an outstanding performance in any conditions.
. Innovative design and high stability power amplifiers.
. Fan-cooled AB class high power amplifier in 19”rack, 2Usize
. Rugged amplifiers in a strong, compact chassis.
. 2 independent channels with separate protection system and power supply
. Smart-designed protection system for auto re-operation after fault.
. Auto-adjusting speed fan.
. 4LEDs for operation/protection, limit, power on and clip
. High-current toroidal transformer designed for high power at 2Ohms with low noise.
. Independent DC and thermal overload protection on each channel.
. IEC standard power connectors.
. Binding post and NEUTRIK® SPEAKON outputs power connectors.
. Balanced XLR inputs/ parallel outputs.
2
MODEL MISTRAL6000
(
)
20Hz 20KHz@0.1%THD, Stereo Mode
8 ohms per channel(EIAJ) 1070W
4 ohms per channel (EIAJ) 1500W
Bridge Mono Mode
8 ohms, 1KHz, 0.1% THD (EIAJ) 3000W
Distortion (SMPTE-IM) <0.05%
Frequency Response
Damping Factor, 1KHz and below >400 at 8ohms
Signal to Noise, 20Hz-20KHz 110dB
Voltage Gain
Input Sensitivity @ 4 ohms 6Vrms
Input Clipping 10Vrms (+22dB)
Input Impedance 10K ohms unbalanced, 20k ohms balanced 56 (36dB)
Controls
Indications (1 per channel)
Connectors, each channel
20Hz-20KHz ± 1dB, -3dB points: 10Hz-60KHz
40 × (31dB)
Front: AC switch, CH1 & CH2 Gain Knobs
Rear: Limiter, Bridge selector
Power-on blue LED
Operation / Protection : Dual color (Green/Red LED)
Limit: Red LED
Clip: Red LED
Input: Active balanced XLR
Parallel output: XLR
Output NEUTRIK® Spoken and Binding posts
Cooling Continuously variable-speed fan, rear-to –front air flow
Load Protection
Power requirements 200-240 (100-120) Vac 50~60Hz
Dimensions
Net Weight 26.47Kg
On / off muting, DC-fault load grounding relay: internal fault
19” (48.3cm) rack mounting, 5.2” (13.3cm) tall (3 rack
spaces)
45.3cm) deep (rack mounting to rear support ears
17.8”
7654321
8
D
C
XLR FEMALE90
XLR MALE90
(PARALLEL OUTPUT)
B
A
R1_58
68K 1/2W
CH1 BILED2
CH1 CLIP-
+15V
D1_1
C1_8
220uF/25V
GND1
C1_11
C1_12
N/C
GND1
560pF/50 cer
R1_17
NTC 50R
C1_45
220uF/25V
7
D1_4
-15V
C1_10
27pF/50 cer
R1_11
15K SPEAKERS BUS
R1_64
15K
4
3
2
1
C1_9
0R
R1_15
4K7 10W
R1_14
820R
D1_7
ZD5V6 1/2W
D1_5
1N4936
D1_6
1N4936
R1_16
R1_18
820R
D1_8
ZD5V6 1/2W
R1_19
4K7 10W
VAC FAN1-C H1
1
D1_27
W2- 04
2
3
-V FAN CH1
VAC FAN2-C H1
D1_11
TRIMMER 1K
TRIMMER 1K
D1_12
TRIMMER 100R
V1+
84
U1_1C
NJM4580L
V1-
(1.5A 200V)
0R
R1_21
R1_20
0R
D1_9
1N4148
Q1_1
MJE15032
R1_62
5R6 1W
R1_22
5R6 1W
Q1_2
MJE15033
D1_10
1N4148
C1_42
470uF/35V
V1+
V1-
R1_1
1K8
84
U1_4
LM317T
R1_25
22R 1W
TP1_3
TP1_6
R1_26
0.22 5W
Q2_3
C1_13
3.3nF/50 cer
C1_14
3.3nF/50 cer
GND1
R1_27
0.22 5W
Q2_4
C1_15
470uF/160V
C1_16
6x2SC5200
Q1_9 Q1_10 Q1_11 Q1_12
R1_32
22R 1W
U1_2C
NJM4580L
R1_3
NTC 500R
12
R1_33
0.22 5W
R1_34
0.22 5W
100nF/50 cer
R1_2
0R
C1_44
R1_28
0.22 5W
Q1_5 Q1_6 Q1_7 Q1_8
R1_29
0.22 5W
R1_30
0.22 5W
R1_31
0.22 5W
6x2SA1943
16x470uF/160V
C1_17
C1_19
C1_21
C1_23
D1_13
1N4148
C1_40
22nF/100V poly
D1_14
1N4148
C1_18
C1_20
R1_35
0.22 5W
D1_28
1N4004
C1_43
10uF/63
R1_36
0.22 5W
R1_23
2K2 5W
R1_24
2K2 5W
C1_22
C1_24
Q1_13
R2_37
0.22 5W
FAN OUT CH1
JP1_14
+12V
2P2.5
2
1
FAN
Q1_14
R2_38
0.22 5W
D1_15
1N5402
GND1
C1_25
C1_27 C1_29
OUTPUT STAGE_A
C1_26
C1_28 C1_30
GND1
D1_16
1N5402
+110V_A
1 2
1 2
-110V_A
GND1
K1_1
RELAY VBS SERIES
JP1_1
CN-PCB6.3
CH1 OUTPUT
SPEAKON PCB
JP1_2
CN-PCB6.3
+110V_A
R1_49
15K 3W
R1_50
PTC 65R
100R/10K
Q1_17
MPSA42
TURN ON DELAY
D1_21
ZD36V 1W
R1_39
5R6 2W
L1_1
2uH 10A
R1_40
12R 5W
GND1
5mm RED LED
Q1_15
MPSA92
D1_19
W2- 04
(1 5A 200V)
R1_44
6K8 1W
R1_41
12R 5W
C1_31
68nF/250V poly
CH1 BILED1
D1_17
R1_42
330K
Q1_16
MPSA92
R1_43
100K
D1_23
1N4004
ON/PROT ECTION
R1_46
100K
R1_47 47K
D1_20
1N4004
R1_48
330K
C1_32
10uF/63
R1_45
1K5
RELAY POWER1
CH1 OUTPUT
GND1
D1_18
ZD7V5 1/2W
CH1 BILED2
C1_33
47uF/63V
C1_34
220uF/16V NP
D1_22
1N4004
GND1
R1_63
1K5 3W
MISTRAL6000 Schematic Diagram 1 of 2
CH2 AMPLIFIER
MIS60-CH2.S CH
Titel
ALTO MISTRAL6000-CH1 DRIVE
PCB# MIS6000.PCB
Size
A2
MISTRAL6000
27-Jan-2005
Date:
File:
MIS60-CH1.Sch
Sheet
Drawn By :
1
2
1
2
RevisionModel No:
TO
1+
1-
C.C.L IN
D
C
B
A
VER050127
21 of
CH1 INPUT
J1_1
J1_2
R1_53
8K2
(CH1 LIMITER MODE)
GND1
1
3
2
2
3
1
GND1
2 1
V1+
C1_35
56pF/50 cer
2
3
GND1
CH1 IN-
CH1 IN+
FC T TAUD 60 0
(OPTION)
D1_25
1N4004
U1_2A
NJM4560L
D1_24
W2- 04
(1.5A 200V)
S1_1A
3
1
SW 2C_2P
J1_4
3P2.5
GND1
2
5
4
T1_1
J1_5
3P2.5
GND1 GND1
CH1 INSERT CONNECTOR
6
5
GND1
R1_54
10K
R1_52
47R
1
2
CH1 CLIP+
GND1
CH1 CLIP-
1 2
3 4
5 6
7 8
9 10
JP1_3
6
9
7
8
C1_1
22uF/50V
C1_2
22uF/50V
1
3
HEADER 5X2
-V_FAN_CH1
VAC FAN1-CH1
7
U1_2B
NJM4560L
220uF/16V
C1_37
R1_57
R1_55
330R
(FTR VT90N1 VACTEC+)
CH1 PHOTO COUPLER
R1_9
100R
D1_2
W2- 04
(1.5A 200V)
100pF/50 cer
RB1_1A
4x10K
RB1_1C
4x10K
C1_4
100pF/50 cer
GND1
CH1 INSERT IN
CH1 INSERT OUT
D1_26
2 1
1N4004
BRIDGED
6
4
NORMAL
1 2
3 4
5 6
7 8
9 10
GND1 GND1
JP1_15
HEADER 5X2
RB1_1B
4x10K
2
3
RB1_1D
4x10K
GND1
47uF/35V
V1-
S1_1B
SWITCH 2C_2P
5
-110V_A
+110V_A
CH1 BILED1
CH1 CLIP+
100R
U1_5
VTL5C2
41
2 3
GND1
C1_3
C1_5
47uF/35V
1
U1_1A
NJM4560L
C1_6
3
2
1
R1_5
3P-2.5
CH1 GAIN
CH1 BRIDGE SWITCH
FAN OUT CH1
VAC FAN2-C H1
C1_36
56pF/50 cer
GND1
GND1
R1_7 N/C
R1_6
N/C
R1_56
82K 1/2W
R1_51
100K
GND1
R1_8
10K
1 2
3 4
5 6
7 8
9 10
JP1_16
HEADER 5X2
CH1 PILOTLIM
C1_7
56pF/50 cer
6
5
U1_1B
NJM4560L
R1_10
330R
V1+
ZD15V1.3W
R1_13
68R
C1_38
1.5nF/250 cer
ZD15V1.3W
V1-
GND1
TO USE ONLY CH2 PUT JUMPER ON PIN 6&8
JP1_5
CN-PCB6.3
2
1
RECTIFIER BRIDGE1+
JP1_6
CN-PCB6.3
2
1
COM1
JP1_7
CN-PCB6.3
2
1
RECTIFIER BRIDGE1-
JP1_8
CN-PCB6.3
2
1
AC INPUT
1 2 3 4 5 6 78
OUTPUT STAGE_A
RELAY POWER1
JP1_9
JEF-505
JP1_11
JEF-505
FUSE1-1
1
2
FUSE1-2
1
2
6.3x32 FUSE HOLDER
10AT
10AT
JP1_10
JEF-505
1
2
JP1_12
JEF-505
1
2
+110V_A
-110V_A
JP1_13
HEADER 3
7654321
8
D
C
XLR FEMALE90
XLR MALE90
(PARALLEL OUTPUT)
B
A
R2_58
68K 1/2W
CH2 BILED 2
CH2 CLIP-
+15V
D2_1
C2_8
220uF/25V
GND2
C2_11
C2_12
N/C
GND2
560pF/50 cer
R2_17
NTC 50R
C2_45
220uF/25V
7
D2_4
-15V
C2_10
27pF/50 cer
R2_11
15K SPEAKERS BUS
C2_9
0R
3
2
1
4
R2_15
4K7 10W
1N4936
R2_18
820R
ZD5V6 1/2W
R2_19
4K7 10W
VAC FAN 1
1
D2_27
W2-04
3
-V FAN CH2
VAC FAN 2
R2_14
820R
D2_7
ZD5V6 1/2W
D2_5
D2_6
1N4936
R2_16
TRIMMER 100R
D2_8
V2+
84
V2-
(1 5A 200V)
2
D2_9
1N4148
MJE15032
D2_11
0R
R2_21
TRIMMER 1K
R2_20
TRIMMER 1K
D2_12
0R
Q2_2
MJE15033
D2_10
1N4148
U2_1C
NJM4580L
C2_42
470uF/35V
Q2_1
R2_62
5R6 1W
R2_22
5R6 1W
R2_1
1K8
V2+
84
V2-
R2_25
22R 1W
TP2_3
TP2_6
R2_32
22R 1W
U2_2C
NJM4580L
U2_4
LM317T
12
R2_26
0.22 5W
Q2_3
R2_27
0.22 5W
Q2_4
R2_28
0.22 5W
Q2_5 Q2_6 Q2_7 Q2_8
6x2SA1943
12x470uF/160V
C2_15
C2_17
D2_13
C2_13
3.3nF/50 cer
GND2
C2_14
3.3nF/50 cer
470uF/160V
C2_16
1N4148
C2_40
22nF/100V poly
D2_14
1N4148
C2_18
6x2SC5200
Q2_9 Q2_10 Q2_11 Q2_12
R2_33
0.22 5W
R2_3
NTC 500R
R2_34
0.22 5W
100nF/50 cer
R2_2
0R
C2_44
R2_35
0.22 5W
C2_43
10uF/63
R2_29
0.22 5W
C2_19
C2_20
R2_36
0.22 5W
D2_28
1N4004
R2_30
0.22 5W
C2_21
C2_23
R2_23
2K2 5W
R2_24
2K2 5W
C2_22
C2_24
Q2_13
R2_37
0.22 5W
FAN OUT CH2
JP2_14
+12V
2P2.5
2
1
FAN
R2_31
0.22 5W
GND2
C2_25
OUTPUT STAGE_B
C2_26
Q2_14
R2_38
0.22 5W
D2_15
1N5402
C2_27 C2_29
C2_28 C2_30
GND2
D2_16
1N5402
+110V_B
K2_1
RELAY VBS SERIES
CH2 OUTPUT
R2_39
5R6 2W
1 2
L2_1
1 2
-110V_B
2uH 10A
MPSA92
D2_19
W2-04
(1.5A 200V)
GND2
R2_40
12R 5W
C2_31
68nF/250V poly
GND2
CH2 BILED1
D2_17
5mm RED LED
Q2_15
Q2_16
MPSA92
R2_44
6K8 1W
R2_41
12R 5W
R2_42
330K
R2_43
100K
D2_23
1N4004
ON/PROTECTION
R2_46
100K
D2_20
1N4004
C2_32
10uF/63
R2_45
1K5
RELAY POWER2
R2_47 47K
R2_48
330K
GND2
D2_18
ZD7V5 1/2W
CH2 BILED2
C2_33
47uF/63V
C2_34
220uF/16V NP
D2_22
1N4004
GND2
+110V_B
Q2_17
MPSA42
TURN ON DELAY
D2_21
ZD36V 1W
R2_63
1K5 3W
MISTRAL6000 Schematic Diagram 2 of 2
Titel
ALTO MISTRAL6000-CH2 DRIVE
PCB# MIS6000.PCB
Size
Date:
File:
A2
MISTRAL6000
3-Feb-2005
MIS60-CH2-050203.Sch
Sheet
Drawn By :
JP2_1
CN-PCB6.3
1
2+
2
CH2 OUTPUT
TO
SPEAKON PCB
1
2-
2
JP2_2
CN-PCB6.3
R2_49
15K 3W
R2_50
PTC 65R
100R/10K
RevisionModel No:
VER050203
21 of
C.C.LIN
D
C
B
A
CH2 INPUT
J2_1
J2_2
R2_53
8K2
050203 modify
1
3
2
2
3
1
GND2
V2+
C2_35
56pF/50 cer
2
3
GND2
CH2 LIMITER MODE
CH2 IN-
CH2 IN+
FC T TAUD600
(OPTION)
2 1
D2_25
1N4004
U2_2A
NJM4560L
D2_24
W2-04
(1 5A 200V)
J2_4
3P2.5
GND2
2
5
4
T2_1
J2_5
3P2.5
GND2 GND2
CH2 INSERT CONNECTOR
6
5
GND2
R2_54
10K
R2_52
47R
1
GND2
1
6
9
7
8
3
1 2
3 4
5 6
7 8
9 10
JP2_3
HEADER 5X2
U2_2B
NJM4560L
CH2 CLIP+
R2_9
100R
CH2 CLIP-
C2_1
22uF/50V
C2_2
22uF/50V
100pF/50 cer
2 1
7
R2_55
330R
C2_37
220uF/16V
(1.5A 200V)
RB2_1A
4x10K
RB2_1C
4x10K
C2_4
GND2
GND2
CH2 INSERT IN
CH2 INSERT OUT
D2_26
V2-
1N4004
-110V_B
+110V_B
CH2 BILED1
CH2 CLIP+
R2_57
100R
2 3
GND2
C2_36
56pF/50 cer
U2_5
VTL5C2
41
(FTR VT90N1 VACT EC +)
CH2 PHOTO COUPLER
D2_2
W2-04
C2_3
100pF/50 cer
RB2_1B
2
3
RB2_1D
4x10K
4x10K
C2_6
47uF/35V
C2_5
47uF/35V
1
U2_1A
NJM4560L
3
2
1
R2_5
3P-2.5
CH2 GAIN
GND2
GND2
R2_7 N/C
R2_6
N/C
R2_56
82K 1/2W
R2_51
100K
GND2
R2_8
10K
1 2
3 4
5 6
7 8
9 10
JP2_16
HEADER 5X2
CH2 PILOTLIM
C2_7
56pF/50 cer
6
5
U2_1B
NJM4560L
V2+
ZD15V1.3W
R2_13
68R
C2_38
1.5nF/250 cer
ZD15V1.3W
V2-
050203 modify
CH2 BRIDGE
CH2 LIMITER MODE
-V_FAN_CH2
VAC FAN1
GND2 GND2
BRIDGED
6
4
NORMAL
HEADER 5X2
1 2
3 4
5 6
7 8
9 10
JP2_15
S2_1B
SWITCH 2C_2P
5
S2_1A
3
1
SW 2C_2P
FAN OUT CH2
VAC FAN 2
2
GND2
R2_10
330R
GND2
TO USE O N L Y CH 2 PU T JU M PER ON PIN 6&8
JP2_5
CN-PCB6.3
2
1
RECTIFIER BRIDGE2+
JP2_6
CN-PCB6.3
2
1
COM2
JP2_7
CN-PCB6.3
2
1
RECTIFIER BRIDGE2-
JP2_8
CN-PCB6.3
2
1
AC IN PUT
1 2 3 4 5 6 78
OUTPUT STAGE_B
RELAY POWER2
JP2_9
JEF-505
JP2_11
JEF-505
FUSE2-1
1
2
10AT
FUSE2-2
1
2
6.3x32 FUSE HOLDER
10AT
JP2_10
JEF-505
1
2
JP2_12
JEF-505
1
2
+110V_B
-110V_B
JP2_13
HEADER 3
D
4
C
B
A
VER050127
11 of
C.C.LIN
RevisionModel N o:
Drawn By:
Sheet
MISTRAL6000
ALTO : MISTRAL6000 MAIN2-BOARD
Titel
321
2
1
P3
CON2
+110V_A
R2
0.22 5W
R1
0.22 5W
2x2SA1943
Q1 Q2
2
1
P5
CON2
GND1
Q3 Q4
P4
2
1
CON2
R4
0.22 5W
R3
0.22 5W
-110V_A
2x2SC5200
27-Jan-2005
MIS60MN2.Sch
A2
Size
File:
Date:
1
2
P1
D
C
CON2
1
2
P2
CON2
1 2 34
B
A
D
C
B
A
VER031206
11 of
C.C.LIN
RevisionModel N o:
4
Drawn By:
Sheet
MISTRAL4000
ALTO : MISTRAL4000 INPUT
27-Jan-2005
MIS40IN.Sch
A4
Titel
Size
File:
Date:
321
CN4
123
CN2
CON3
CN3
12345
CON5
123
CON3
123
CN1
CON3
PJ1
PHONEJAC K2
1 2 34
D
C
B
A
D
C
B
A
VER030710
11of
C.C.LIN
RevisionModel No:
4
Drawn By:
Sheet
2
MISTRAL4000
2
D1_30
1 2
321
D2_30
1 2
3mm YELLOW LED
3mm YELLOW LED
D1_3
LIMITER
LIMITER
1 2
D2_3
1 2
D1_29
CLIP
3mm RE D LED
D2_29
CLIP
3mm RE D LED
POWER ON
3mm BL UE LED
1 2
POWER ON
3mm BL UE LED
1 2
RED
D1_1
RED
D2_1
GREEN
1
1
2
1
3mm R/G BLCOL LED
2
GREEN
1
3mm R/G BLCOL LED
JP1_22
1 2
3 4
5 6
7 8
9 10
HEADER 5X2
ON/PROTECTION
JP2_22
1 2
3 4
5 6
7 8
9 10
HEADER 5X2
ON/PROTECTION
ALTO : MIST RAL4000 FP
9-Apr -2004
MIS40FP.Sch
A4
Titel
Size
File:
Date:
VR1_1
B50K
123
CN1_1
D
3P2.5
CN2_1
C
VR2_1
B50K
123
3P2.5
B
A
1 2 34
D
C
B
A
VER050127
11 of
C.C.LIN
RevisionModel N o:
4
Drawn By:
Sheet
MISTRAL6000
ALTO : MISTRAL6000 SP-BOARD
27-Jan-2005
MIS60SP.Sch
A2
Titel
Size
File:
Date:
321
SPK1
SP1
2-
SPEAKON
1+
2+
1-
BR_NEG
JP6
SP1
JP2
GND1
BR POS
JP3
OUT2
BR POS
JP5
JP1
SP1
SPK2
2-
SPEAKON
1+
JP7
SP1
2+
1-
BR_NEG
JP8
SP1
JP4
GND2
1 2 34
D
C
B
A
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