Alto_A400.4_Power_Amp_Service_Manual.pdf

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MODEL:
A400.4
www.altoproaudio.com
Version 1.0
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
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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.
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Single channel over-heat protection.
-1-
2. Specification
MODEL
A400.4 DRAGONFLY
20Hz 20KHz@0.1%THD, Stereo Mode
8 ohms per channel(EIAJ)
4 ohms per channel(EIAJ)
4 ohms per channel(RMS)
Input Sensitivity @4 ohms
Controls
65W
120W
62W+3W
+3dBu
(at THD:1%)
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
Input: COMBO connector
Output: 1/4" TS jack connector
Connectors of each channel
Power Supply
Dimension
Net Weight
190-240 Vac~50Hz / 95-120Vac~60Hz
314mm x 208.5mm x 66.6mm
3.8Kg
-2-
1
2
3
4
3. Block Diagram
D
D
A400.4
BLOCK DIAGRAM
CH1
C
D100W
AMP
C
CH2
PM8PWR
POWER SUPPLY
B
-3-
PRE-AMP
B
CH3
D100W
AMP
CH4
A
A
1
2
3
4

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