SoundCraft R750 User manual

1584 PETIT JEAN MOUNTAIN ROAD, MORRILTON, AR 72110
www.sound-craft.com | [e-mail] O | 800.643.8747 F | 501.727.5402
Your lectern may not contain all of the electronic modules as shown and explained here. Speakers and lectern microphone are
pre-wired. To install gooseneck microphone, pull out connector from microphone holder and snap microphone into connector.
Install back into microphone holder.
CONTROL PANEL
1. MIC 1: Adjusts volume level of gooseneck microphone on reading table.
2. MIC 2: Adjusts volume level of microphone plugged into the MIC 2 input jack on
amplifier.
3. AUX: Controls output level of device that is plugged into the 1/8" jack.
4. BASS: This control cuts or boosts the bass level.
5. TREBLE: This control cuts or boosts the treble level.
16 CHANNEL WIRELESS RECEIVER
 Channel Display
 RF - Radio Frequency Indicator
 AF - Audio Frequency Indicator
 ASC / IR Auto Channel Select (Handheld Only)
 Select Buttons - Manual Channel Selection
 Mute Level Adjustment
 Volume Control
RECEIVER / HANDHELD MIC/TRANSMITTER SETUP:
The receiver has its own POWER / VOLUME Control. Turn Power On. A
Frequency Channel will appear in the Channel Display. Press Select Buttons to
select a channel. Channel number must match channel number on wireless
transmitter.
MUTE LEVEL is set at half way mark when it leaves the factory. If speaker sound
is breaking up, turn level clockwise with small screwdriver until condition improves.
If you are using the Wireless Handheld Microphone Transmitter, screw off the
lower bottom section of microphone and insert 2 - "AA" 1.5 Volt alkaline batteries.
IMPORTANT: Because the microphone has an AUTO SYNC function, you first
select channel you wish to use on the receiver. Then press the ASC button, the IR
light will start to flash. Turn on microphone and point end of microphone at the
flashing IR light on receiver and the microphone will auto sync to the same channel
as selected on the receiver.
BATTERIES
1. Hold the body of microphone in hand and twist off bottom section of microphone.
2. Insert two “AA” batteries.
3. Twist bottom section back on to microphone.
BATTERY STATUS
The life expectancy of the two batteries is about 10 hours. When the “BATTERY”
symbol on the display screen keeps flashing the batteries should be replaced
immediately.

OPTIONAL BODYPACK TRANSMITTER SETUP:
The receiver has its own POWER / VOLUME Control. Turn Power On. A
Frequency Channel will appear in the Channel Display. Press Select Buttons to
select a channel. Chan-nel number must match channel number on wireless
transmitter.
MUTE LEVEL is set at half way mark when it leaves the factory. If speaker
sound is breaking up, turn level clockwise with small screwdriver until condition
improves.
The transmitter bodypack is operated by 1 - "AA" 1.5 Volt alkaine battery. Slide
off battery cover and install battery as shown. Make certain the battery is fully
seated in its compartment so the cover slides in place easily. Battery life with
alkaline batteries is approximately 8 hours of operating time.
Select a channel (1-16) on side panel using the supplied screw driver to select
channel number. Channel selected should match channel on receiver. When
transmitter and receiver are set to correct channel the RF indicator will
glow red when transmitter is turned on.
Plug the Lapel microphone into the Mic Input Jack. The microphone can be
clipped to a necktie or other clothing,
using the supplied clip. The lapel mic should be placed under the chin, as close
to the center of the body as possible.
Slide the power ON/OFF/MUTE switch to the ON position (the LED indicator
light will illuminate green). Replace batteries when this LED turns red.
GAIN SWITCH: If you are a soft spoken person then set the switch to the 10
dB position. If you are a loud speaking person then set the switch to the -10 dB
position. Adjust to prevent distortion while speaking.
Functions
1) Interchangeable Microphone Head
2) LCD Screen
3) Power / Mute Control Switch
4) Select Button
5) Microphone Input Sensitivity Adjustment—is used to set the gain of
microphone. If you are a soft talking speaker you will need to turn the control
counter clockwise. Turn clockwise if you are a loud talker. Use plastic
screwdriver that is supplied.
TURN ON MICROPHONE: Push and hold the “POWER/MUTE” (3) button until
LCD screen lights up.
TO MUTE: Press “POWER/MUTE” button twice to MUTE. Channel number
will flash when muted.
Press button again twice to remove “MUTE”.
TURN OFF MICROPHONE: Push and hold the “POWER/MUTE” (3) button for
2 seconds to turn microphone “OFF”.
SELECT CHANNEL (Manual): Press and hold the “SELECT” (4) button for 2
seconds until you only see the word Channel and channel number.
To change channel, when flashing, press the “SELECT” (4) button until you
reach the desired channel. Flashing will stop after 10 seconds and channel is
now set.
LOCK / UNLOCK CHANNEL: Push the “POWER/MUTE” (3) button and
“SELECT” button at the same time to lock or unlock channel. When locked,
channel cannot be changed. “LOCKED” symbol appears in upper left-hand
corner.

BLUETOOTH MODULE
With main power switch on, press button to turn
Bluetooth pairing on and hold for 4 seconds to enter into
the pairing mode.
The RED LED will start to flash, searching for a
Bluetooth signal. Search function will stay active for 10
minutes. If no signal is found ,this function will shut off.
During the search function turn on your Bluetooth device
for pairing. On your Bluetooth menu of your device,
choose pin code 0000. Once paired, red LED will stay
on.
Use this button to move to the next song or to
play previous song.
Use to pause. When paused you will need to press
again to start playing.
VOLUME CONTROL Use to adjust the volume of the
Bluetooth material.
150 WATT AMPLIFIER
MIC 2: XLR connector for external wired microphone
AUX IN: 1/8" (3.5mm) connector . Use for connecting
to other electronics.
LINE OUT: 1/4" connector. Use for connecting to
other electronics.
EXTERNAL SPEAKER: 1/4" connector. For external
speaker use.
AMPLIFIER POWER : ON / OFF SWITCH

IMPORTANT
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference received, includ-ing inter-
ference that may cause undesired operation.
The unit’s circuitry may cause interference to nearby radios. To prevent interference, either switch the unit off or move away
from the affected radio.
NOTE: This equipment complies within the limits for a class B digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference in a residential installation. This equipment gener-
ates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turn-
ing the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio / TV technician for help.
NOTE: Shielded cables may be required to be used with this unit to en-sure compliance with the Class B FCC limits.
TROUBLESHOOTING GUIDE
PROBLEM & ITEMS TO CHECK
UNIT WILL NOT TURN ON
 Is unit plugged in?
SOUND IS MUFFLED
 Bass too high
 Treble too low
FEEDBACK: A LOUD SQUEALING, SHRILL OR HOWLING SOUND THAT IS SELF GENERATED
 Feedback occurs when a microphone is too close to the speaker or the microphone volume is too high, or the microphone
is pointed towards the speaker. It is also caused by sound reflecting off hard surfaces.
 Reduce or eliminate Feedback by
 Pointing the microphone in a different direction
 Keeping the microphone BEHIND the speakers
 Turn down the volume levels
POWER IS ON, BUT NO SOUND
 Check main volume level.
 If using wireless, be sure receiver and transmitter battery is installed and both units are turned on.
MICROPHONE SIGNAL IS WEAK
 If microphone has batteries, check batteries.
 Check cables/connectors.
WIRELESS MIC DOES NOT WORK
 Check that transmitter batteries are fully charged and ensure transmitter is on.
 Does yellow “signal” LED light when transmitter is turned on?
 Are the transmitter and receiver on the same channel? (1-16)
WIRELESS MIC CUTS IN AND OUT
 Is unit visible (line of sight) from user? If not, move unit into view when using wireless microphone.
 Does the yellow “signal” LED go out when signal drops out? Check battery in transmitter.
MAKES BUZZING NOISE
 Check cables – a damaged cable will cause this. Unplug cables one at a time until buzzing stops.
 Check for Ground loops – use a ground loop isolator where needed.