Marchand Electronics mb401 Manual Download Page 1 | Manualshive

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©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com

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Marchand Electronics Inc.

PO Box 473, Webster, NY 14580

Tel:(585) 872-0980 Fax:(585) 872-1960

[email protected] http://www.marchandelec.com

(c)2002 Marchand Electronics Inc.

MB401 300 Watt MOSFET Power Amplifier

500W into 4 Ohm
300W into 8 Ohm

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Summary of Contents for mb401

Page 1: ...2 0980 www marchandelec com 1 Marchand Electronics Inc PO Box 473 Webster NY 14580 Tel 585 872 0980 Fax 585 872 1960 info marchandelec com http www marchandelec com c 2002 Marchand Electronics Inc MB401 300 Watt MOSFET Power Amplifier 500W into 4 Ohm 300W into 8 Ohm ...

Page 2: ...ts Binding Posts Connection for the loudspeakers Fuse Protects the amplifier in case of overload Thermal cutout Protects the amplifier in case it gets too hot Power entry connector Standard line cord for 120V AC 1 phase operation Specifications Frequency response 20Hz 20KHz 1 dB Harmonic Distortion 1KHz 10W 0 02 or better Sensitivity 1 28VRMS Voltage gain 32dB 40X Input impedance RCA 500 KOhm Shor...

Page 3: ...mplifier Inputs Electronic Crossover XM6 XM9 XM16 or XM26 In in in in in in out in out hi out lo High Low Left Right MB401 Power Amplifier In Out MB401 Power Amplifier In Out Left Right MB401 Power Amplifier In Out MB401 Power Amplifier In Out Figure 2 Sound System with 2 way Electronic Crossover Network ...

Page 4: ...elec com 4 Figure 3 Inside view Note the placement of the MB401 power amplifier board mounted on heatsink on the rear of the unit and the PS112 power supply board mounted onto the bottom of the chassis The toroidal power transformer is mounted near the left of the unit on the baseplate ...

Page 5: ... 2001 Marchand Electronics Inc PO Box 473 Webster NY 14580 585 872 0980 www marchandelec com 5 Figure 4 Rear view of the amplifier Figure 5 Inside view of the rear panel ...

Page 6: ...UL 3 22 ga black UL 3 22 ga white UL 1 heatsink compound 1 line cord 1 Hex L Key 3 32 1 Hex L Key 7 64 1 Hex L Key 9 64 Assembly instructions Before assembling the MB401 amplifier complete the assembly of the MB401 power amplifier board and the PS111 power supply board Rear panel Remove the rear panel from the cabinet before starting this assembly Mount the following parts to the rear panel 1 DPDT...

Page 7: ...d Use 22 wire for all other interconnect Chassis grounding Solder the 2400Ohm 2W resistor to a solder lug Solder a length of black wire to the other end of the resistor Install solder lug under one of the hex standoffs of the MB401 board Connect the wire the GROUND connection terminal marked G of the three position terminal block of the MB401 board This will connect the chassis of the amplifier to...

Page 8: ...ck white DPDT switch w light Rear panel Rear Panel Power entry Wire to Case N L Front panel Power switch MB401 GND V V V V Brown 18 AC CT TA AC Red Yellow Blue Gray white black Green yellow orange brown primary connections shown for 120V line Toroidal Power Transformer black white orange brown connect primary like this for 240V line Toroidal Power Transformer black black use black wires with xform...

Page 9: ...lifier Signal Wiring c 2000 Marchand Electronics Inc XLR MB301 inv GND non out GND XLR 1 2 3 RCA RCA RED BLK Binding Posts red Speaker red Orange 22 orange Brown 22 brown Red 18 Brown 18 Use heavy 18 gauge wire for the speaker wires only Red 22 1 2 3 G IN brown Figure 7 Rear panel wiring for signal and speaker ...

Page 10: ... C2 1 0uF Stacked Film C3 1pF Ceramic NPO C4 1pF Ceramic NPO C5 47uf 100v Aluminum Electrolytic C6 47uf 100v Aluminum Electrolytic C7 1000 pF Ceramic Disk C8 4 7uf 250v Aluminum Electrolytic C9 4 7uf 250v Aluminum Electrolytic C10 2200uf 80v Aluminum Electrolytic SF C11 6800uf 6 3v Aluminum Electrolytic C12 6800uf 6 3v Aluminum Electrolytic C13 6800uf 6 3v Aluminum Electrolytic C14 0 22uf Stacked ...

Page 11: ...Terminal block Black 17 4 40x3 4 Machine Screw 17 4 40 Nut 17 4 flat washer 34 4 split lockwasher 1 Heat Sink Bracket 2 TO220 heatsink TALL 1 Bag Heat Sink Compound 1 MB401 circuit board 2 testpoint Assembly Instructions Most parts are installed in the usual way Insert the part at the location on the circuit board as indicated by the silk screen identification and solder on the solder side of the ...

Page 12: ...e Take a few minutes to check all components and orientations Also make sure there are no solder bridges Bias current adjustment Class AB The bias current of the amplifier must be adjusted by setting the potentiometer R22 First turn the potentiometer fully counterclockwise This will set the bias current to zero Hook the MB401 to a bipolar power supply The supply voltage should be between 30V and 6...

Page 13: ...34 A B C D E F G H R30 A B C D E F G H R31 A B C D E F G H C10A B C D V V C16 A B C D Q17A B C D E F G H Q18 A B C D E F G H R1 R2 MB401 MOSFET Power Amplifier c 2002 Marchand Electronics Inc D6 R25 R27 Q16 R33 C14 D16 D14 D15 D17 R35 A B C D E F G H R17 R16 Q6 R18 Q8 Q9 R19 V V R10 Q7 C12 C11 Q14 Q15 R36 A B C D E F G H C6 C5 R14 D8 D9 R26 R28 C13 C15 R29 R37 on heatsink C7 R22 R13 R32 A B C D E ...

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