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Service
MODEL: MISTRAL2500/4000
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..................................................19
8. BOM...................................................................................................24
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 special-
designed 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
2. Specification
MISTRAL2500 MISTRAL4000
Output Power
20Hz~20KHz @0.1% THD, SCD MODE
8 ohms per channel (EIAJ) 450W 625W
4 ohms per channel (EIAJ) 700W 1000W
BRIDGE MONO MODE
8 ohms , 1KHz, 0.1%THD 140W 2000W
Distortion (SMPTE-IM) <0.05%
Frequency Response 20Hz-20kHz +/- 0.1dB, -3 dB points: 10Hz-60kHz
Damping Factor, 1 kHz and below >300 at 8 ohms
Signal to Noise, 20 Hz-20 kHz 102 dB
VOLTAGE GAIN 40x (32dB)
Input Sensitivity @ 4 ohms 1Vrms
Input Clipping 10 Vrms (+22 dB)
Input Impedance 10 k ohms unbalanced, 20 k ohms balanced 56(36dB)
FRONT: AC SWITCH, CH1 & CH2 GAIN KNOBS
Controls
REAR: LIMITER, BRIDGE SELECTOR.
Power-On: Blue LED
Operation/Protection : Dual Color (Green/Red LED)
Indicators (1 per channel)
Limit : Red LED
Clip : Red LED
Input: Active balanced XLR
Connectors, each channel Parallel Output : XLR
Output: NEUTRIK Speakon and Binding posts
Cooling Continuously variable-speed fan, rear-to-front air flow
Load Protection On/off muting, DC-fault load grounding relay. Internal fault fuses.
Power Requirements 200-240(100-120)Vac, 50-60Hz
15.9" (40 cm) deep (rack mounting to rear support ears)
Dimensions
19" (48.3 cm) rack mounting, 3.5" (8.9 cm) tall (2 rack spaces)
3
3. Schematic Diagram
1 2 3 4 5 6 7 8
-83V_A R1_58
R1_56 68K 1/2W
+83V_A
82K 1/2W
6 CH1 BILED1 1 2 CH1 BILED2
7 3 4
C1_35 5 CH1 CLIP+ CH1 CLIP-
5 6
56pF/50 cer 7 8
GND1 U1_2B R1_57 9 10
NJM4560L 100R JP1_16
R1_54 HEADER 5X2
10K +83V_A
R1_53
D 8K2 R1_52 D1_9 D
2 47R R1_15 R1_25 R1_28 R1_29 R1_30 R1_31 D1_15
1 1N4148
3 3K3 10W 22R 1W 0.22 5W 0.22 5W 0.22 5W 0.22 5W 1N5402
U1_5 C1_36 R1_51
U1_2A R1_55
GND1 VTL5C2 56pF/50 cer 100K V1+ +15V
NJM4560L 330R Q1_5 Q1_6 Q1_7 Q1_8
3
4
D1_24 D1_1 R1_14
W2-04 ZD15V1.3W 820R
(1.5A 200V)
C1_8
1
4x2SA1943
2
C1_37 GND1 220uF/25V
(CH1 LIMITER MODE) GND1 GND1 GND1 GND1 K1_1
3 S1_1A 220uF/16V 12x1000uF/100V RELAY VBS SERIES
2 D1_7
Q1_1
1 (FTR VT90N1 VACTEC+) ZD5V6 1/2W JP1_1
MJE15032
GND1 SW 2C_2P CH1 PHOTO COUPLER C1_15 C1_17 C1_19 C1_21 C1_23 C1_25 CN-PCB6.3
CH1 PILOTLIM
CH1 OUTPUT 1
CH1 CLIP+ C1_7 TP1_3 2 1+
R1_39
R1_9 D1_5 D1_11
100R 1 5R6 2W 2
R1_8 56pF/50 cer C1_11 1N4936 0R D1_13
GND1 CH1 OUTPUT
10K 6 560pF/50 cer R1_62
D1_2 7 C1_13 1N4148
R1_23
OUTPUT STAGE_A 1
L1_1
2 TO
CH1 CLIP- W2-04 5 5R6 1W SPEAKON PCB
CH1 INPUT 3.3nF/50 cer 1K 5W 2uH 10A
J1_4 (1.5A 200V) D1_6 R1_21
3P2.5 C1_3 C1_40 GND1
U1_1B 1N4936 TRIMMER 1K 1
100pF/50 cer NJM4560L D1_23 2 1-
GND1 22nF/100V poly
C1_1 RB1_1A R1_22 GND1 R1_24 R1_40 R1_41 1N4004
TRIMMER 100R
JP1_2
1
GND1
R1_16
1 22uF/50V 4x10K RB1_1B R1_20 5R6 1W C1_14 12R 5W 12R 5W
3 CH1 IN- 2 6 3.3nF/50 cer D1_14 1K 5W CN-PCB6.3
C 2 9 4x10K C1_5 R1_13 TRIMMER 1K C
5 7 2 47uF/35V C1_12
RB1_1C 68R
4x10K 1 N/C 1N4148 C1_31
J1_1 CH1 IN+ 4 8 3 D1_12 68nF/250V poly
XLR FEMALE90 U1_1A C1_38
C1_2 0R TP1_6 1000uF/100V
NJM4560L 1.5nF/250 cer
3
T1_1 GND1
2 22uF/50V RB1_1D R1_17
3 FCT TAUD600 C1_4 C1_16 C1_18 C1_20 C1_22
1 4x10K NTC 50R Q1_2 C1_24 C1_26
(OPTION) J1_5 100pF/50 cer
CH1 BILED2
R1_18 MJE15033 +83V_A
J1_2 3P2.5 GND1GND1
XLR MALE90 820R
GND1 CH1 INSERT IN
D1_18 R1_49
R1_7 4K7
CH1 INSERT OUT GND1 C1_45 4x2SC5200
1 2 220uF/25V CH1 BILED1 ZD7V5 1/2W 10K 5W
3 4 C1_6 D1_8
(PARALLEL OUTPUT) GND1
5 6 D1_26 47uF/35V D1_4 ZD5V6 1/2W
2 1 7 8 2 1 3 ZD15V1.3W D1_17
V1+ 9 10 V1- 2 Q1_9 Q1_10 Q1_11 Q1_12 5mm RED LED R1_50
1 -15V ON/PROTECTION
D1_25 1N4004 R1_6 V1- PTC 65R
JP1_3 R1_5 4K7 R1_46
1N4004 GND1 HEADER 5X2 GND1 3P-2.5 C1_10 R1_32 R1_33 R1_34 R1_35 R1_36 D1_16 100R/10K
R1_19 100K
CH1 INSERT CONNECTOR 27pF/50 cer D1_10 22R 1W 0.22 5W 0.22 5W 0.22 5W 0.22 5W 1N5402 R1_47 47K
CH1 GAIN 3K3 10W Q1_17
GND1 1N4148 MPSA42
Q1_15 D1_20
-83V_A 1N4004
R1_11 MPSA92
R1_42
BRIDGED S1_1B
15K SPEAKERS BUS 330K TURN ON DELAY
6 R1_10 R1_48
5 SWITCH 2C_2P 330R
4 R1_64 Q1_16
330K
NORMAL C1_9 15K MPSA92
B B
ZD36V 1W
0R
V1+ V1+ R1_43 C1_32 C1_33
D1_21
8 10uF/63 47uF/63V
8
CH1 BRIDGE SWITCH GND1 100K
1 2 U1_1C U1_2C
-V_FAN_CH1 3 4 FAN OUT CH1 NJM4580L NJM4580L
5 6
VAC FAN1-CH1 7 8 VAC FAN2-CH1 D1_19 R1_45
9 10 C1_34
4
4
W2-04 1K5 220uF/16V NP
V1- V1- (1.5A 200V)
JP1_15
GND1 HEADER 5X2 GND1 GND1
TO USE ONLY CH2 PUT JUMPER ON PIN 6&8 R1_44
6K8 1W D1_22
JP1_5 R1_63
JP1_9 JP1_10 RELAY POWER1
CN-PCB6.3 JEF-505
JEF-505 1N4004 1K 3W
2 FUSE1-1
D1_28
1 1 1 +83V_A
2 2 1N4004
RECTIFIER BRIDGE1+ 16AT VAC FAN1-CH1 FAN OUT CH1
JP1_6
D1_27
U1_4
C1_44 MISTRAL2500 Schematic Diagram 1 of 2
1
CN-PCB6.3 LM317T
W2-04 (1.5A 200V) 100nF/50 cer
2 OUTPUT STAGE_A
1 JP1_13 3 4 2
2 +12V JP1_14
COM1 HEADER 3 1 2P2.5
C1_43
JP1_7 JP1_11 JP1_12 C1_42 R1_3 10uF/63 2
CN-PCB6.3 470uF/35V 1
JEF-505 JEF-505 NTC 100R
3
2 CH2 AMPLIFIER
1 1
FUSE1-2
1 -83V_A FAN MIS25-CH2.SCH
A 2 2 A
RECTIFIER BRIDGE1- 16AT
JP1_8 R1_2
6.3x32 FUSE HOLDER -V_FAN_CH1
150R
CN-PCB6.3
2 RELAY POWER1 VAC FAN2-CH1 2 R1_1 1
1
1K8
AC INPUT Titel
ALTO MISTRAL2500-CH1 DRIVE
PCB# MIS4000.PCB
Size Model No: Revision
A2 MISTRAL2500 VER031212
Date: 29-Apr-2004 Sheet 1 of 2
File: MIS25-CH1.Sch Drawn By: KEVIN LIN.
1 2 3 4 5 6 7 8
4
1 2 3 4 5 6 7 8
-83V_B R2_58
R2_56 68K 1/2W
+83V_B
82K 1/2W
6 CH2 BILED1 1 2 CH2 BILED2
7 3 4
C2_35 5 CH2 CLIP+ CH2 CLIP-
5 6
56pF/50 cer 7 8
GND2 U2_2B R2_57 9 10
NJM4560L 100R JP2_16
R2_54 HEADER 5X2
10K +83V_B
R2_53
D 8K2 R2_52 D2_9 D
2 47R R2_15 R2_25 R2_28 R2_29 R2_30 R2_31 D2_15
1 1N4148
3 3K3 10W 22R 1W 0.22 5W 0.22 5W 0.22 5W 0.22 5W 1N5402
U2_5 C2_36 R2_51