Motion Sound MS-1771 - Manual (Page 5)

5
Main Power Amplifier and Motor Drive PC board.
The Amplifier chassis is located in the bottom right side of the cabinet (rear view). The power amplifier board contains
Motor power drivers, audio amplifiers, and DC power supplies. Some Transistors require 1 or more thermal/electric
isolators. The power amplifier IC’s require heat sink compound. Some models require the fan to beunsoldered from the
PC board. Note polarity and location of wires. All circuits are on this single PC board.
1. Turn the MS-1771 (looking at the cabinet from the rear) on its right side.
2. Remove the two screws just above the rear top of the chassis.
3. Remove the cabinet lower back cover.
4. Remove the 5 screws from the bottom of the cabinet (they go up into the amplifier chassis).
5. Note polarity and unplug the horn and low rotor connectors.
6. If you remove the PC board make careful note of transistor heat sink insulators.
------ATTENTION!-------
If you intend on moving the MS-1771, leave the MDF sheet
attached to the cabinet bottom or replace the MDF sheet with
plywood to help prevent cabinet damage.
Model MS-1771 Specifications
General Remote standby on switch. Zero maintenance ball bearings on rotary horn and low rotor.
Rotary horn diffuser 11 pin industry standard input connection.
Audio Parameters Input s ignal range -- 7 Volts RMS minimum to 17 Volts RMS maximum.
200 watts bi-amped (130 wattsl Low rotor, 70 watts horn
Active crossover 800Hz 18 db/oct.
Rotor Controls Independent horn and low rotor dynamic controls include; Fast and Slow terminal speeds,
Ramp up time, and ramp down time. DC motor control design.
Speakers Horn Driver rated 80 watts RMS with replaceable Motion Sound MS-1.2 8 Ohm diaphragm.
Low Rotor 15” Eminence Delta 15LF 8 Ohms.
Dimensions H 35.5” W 27.5” D 26” W 120 Lbs.
Power USA 120 VAC 400 Watts Europe 220-240 VAC 400 Watts Fuse in AC inlet Module
www.Motion-sound.com
Salt lake City UT. USA