ITC SFB240 User manual

SFB240
Power amplifier
OPERATION MANUAL
Please follow the instructions in this manual to obtain the optimum results from this unit.We also recommend that you keep this manual handy for future reference.PUBLIC ADDRESS SYSTEMMIXER AMPLIFIERT-B120MIC1 INPUTMASTER 10 0MIC 1 10 0AUX 1 10 0AUX 2 10 0POWERPROT100V70VSIGCLIPOLONOFFBASS+10-10TREBLE +10-10TFUSBIR

TABLE OF CONTENTS21. SAFETY PRECAUTIONS .......................................................................................32. GENERAL DESCRIPTION ....................................................................................53. FEATURES ...............................................................................................................54. NOMENCLATURE AND FUNCTIONS4.1 Front Panel ..............................................................................................................6 4.2 emote control.........................................................................................................6R 4.3 Rear Panel...............................................................................................................75. OPERATION ILLUSTRATION ................................................................................86.TROUBLESHOOTING............................................................................................117. APPLICATIONS ..................................................................................................... 128.BLOCK DIAGRAM .................................................................................................139.SPECIFICATIONS ................................................................................................. 14

Be sure to read the instructions in this section carefully before use. Make sure to observe the instructions in this manual as the conventions of safety symbols and messages regarded as very important precautions are included. We also recommend you keep this instruction manual handy for future reference.Safety Symbol and Message ConventionsSafety symbols and messages described below are used in this manual to prevent bodily injury and property damage which could result from mishandling. Before operating your product, read this manual first andunderstand the safety symbols and messages so you are thoroughly aware of the potential safety Indicates a potentially hazardous situation which, if mishandled, couldresult in death or serious personal injury.Indicates a potentially hazardous situation which, if mishandled, couldresult in moderate or minor personal injury, and/or property damage.When Installing the Unit Do not expose the unit to rain or an environment where it may be splashed by water or other liquids, as doing so may result in fire or electric shock. Use the unit only with the voltage specified on the unit. Using a voltage higher than that which is specified may result in fire or electric shock. Do not cut, kink, otherwise damage nor modify the power supply cord. In addition, avoid using the power cord in close proximity to heaters, and never place heavy objects -- including the unit itself -- on the power cord, as doing so may result in fire or electric shock. Be sure to replace the unit's terminal cover after connection completion. Because high voltage is applied to the speaker terminals, never touch these terminals to avoid electric shock. Be sure to ground to the safety ground (earth) terminal to avoid electric shock. Never ground to a gas pipe as a catastrophic disaster may result. Avoid installing or mounting the unit in unstable locations, such as on a rickety table or a slantedsurface. Doing so may result in the unit falling down, causing personal injury and/or property damage.When the Unit is in Use Should the following irregularity be found during use, immediately switch off the power, disconnect the power supply plug from the AC outlet and contact your nearest dealer. Make no furtherITC attempt to operate the unit in this condition as this may cause fire or electric shock. If you detect smoke or a strange smell coming from the unit. If water or any metallic object gets into the unit If the unit falls, or the unit case breaks If the power supply cord is damaged (exposure of the core, disconnection, etc.) If it is malfunctioning (no tone sounds.) To prevent a fire or electric shock, never open nor remove the unit case as there are high voltage components inside the unit. Refer all servicing to your nearest dealer.ITC Do not place cups, bowls, or other containers of liquid or metallic objects on top of the unit. If they accidentally spill into the unit, this may cause a fire or electric shock. Do not insert nor drop metallic objects or flammable materials in the ventilation slots of the unit's cover, as this may result in fire or electric shock.1. SAFETY PRECAUTIONS3

An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated inthe electrical installation of the building.When Installing the Unit Never plug in nor remove the power supply plug with wet hands, as doing so may cause electric shock. When unplugging the power supply cord, be sure to grasp the power supply plug; never pull on the cord itself. Operating the unit with a damaged power supply cord may cause a fire or electric shock. When moving the unit, be sure to remove its power supply cord from the wall outlet. Moving the unit with the power cord connected to the outlet may cause damage to the power cord, resulting in fire or electric shock. When removing the power cord, be sure to hold its plug to pull. Do not block the ventilation slots in the unit's cover. Doing so may cause heat to build up inside the unit and result in fire. Avoid installing the unit in humid or dusty locations, in locations exposed to the direct sunlight, near the heaters, or in locations generating sooty smoke or steam as doing otherwise may result in fire or electric shock.When the Unit is in Use Do not place heavy objects on the unit as this may cause it to fall or break which may result in personal injury and/or property damage. In addition, the object itself may fall off and cause injury and/or damage. Make sure that the volume control is set to minimum position before power is switched on. Loud noise produced at high volume when power is switched on can impair hearing. Do not operate the unit for an extended period of time with the sound distorting. This is an indication of a malfunction, which in turn can cause heat to generate and result in a fire. Contact your dealer as to the cleaning. If dustITC is allowed to accumulate in the unit over a long period of time, a fire or damage to the unit may result. If dust accumulates on the power supply plug or in the wall AC outlet, a fire may result. Clean it periodically. In addition, insert the plug in the wall outlet securely. Switch off the power, and unplug the power supply plug from the AC outlet for safety purposes when cleaning or leaving the unit unused for 10 days or more. Doing otherwise may cause a fire or electric shock.SAFETY PRECAUTIONS4Due to product upgrades, while some of the features and specification in the user manual does not match the actual functions, sorry for any inconvenience and thanks for your kind understanding!

This is a mini desktop constant pressure amplifier, with beautiful appearance, light weight, easy to carry, and it can be used for background music and radio in family, leisure cafes, classrooms, and other small indoor venues.2. GENERAL DESCRIPTION1.With desktop design, beautiful appearance, light weight, and easy to carry.2.It can be used for different sound effect places. This series including 120W and 240W.3.Super sound quality and high definition, switching options can be connected to 70V or 100V output,and to provide beautiful sound for long distance broadcast.4.The output terminal uses standard 6.3 audio microphone jack and line input use RCA jack, to provideusers with different audio input interface options.5.1 channel microphone input with independent volume control.6.2 channel line inputs with independent volume control. And also with EMC input.7.With function of auto play MP3 and power off memory.8.With priority function, when MIC 1 input, the other audio signal can be disconnected.9.With power indicator, the machine has a signal indicator, overload, protection indicator, and 70V,100V output switch indicator.10.With function of short circuit, overload and over temperature protection.11. With function of MP3 module, can read MP3 files in USB flash disk, TF card, support for Bluetoothof mobile phones and FM radio.53.FEATURES

MIC1 INPUTMASTER 10 0MIC 1 10 0AUX 1 10 0AUX 2 10 0POWERPROT100V70VSIGCLIPOLONOFFBASS+10-10TREBLE+10 -10TFUSBIR4. NOMENCLATURE AND FUNCTIONS64.1 FRONT PANEL
1. Power switch2.Mode3.Previous/next4. Volume increase/decrease5. 0~9 number button6.Play/pause7. Sound effect control8.Mute9. Cycle play button10.PauseRemote control usage attention:1. When install battery, please mind electrode.2. Please let remote control aim right with window of host machine.3. When found remote distance get short and insensitive, please change battery.4. Please take out battery when don't use it for a long time.5. Take it easy in case of falling.Normal usage distance of remote control: Remote control distance: 8 meter, angle: level ±35, vertical±15.4.2 Remote control
MODEEQSTOP
12345678910
37589101113141517191224161618201. Recording function button2. MP3 loop playback function button3. MIC1 input4.Play/Pause5. Next song/Volume reduce6. USB interface7.BASS adjustment potentiometer8.TREBLE adjustment potentiometer9.Master volume control10. The Power switch11. Power indicator light12.PROT/100V/70V/OL/CLIP/SIGstatusindicators 13.AUX2volumecontrolknob 14.AUX1volumecontrolknob 15.MIC1volumecontrolknob 16. TF card slot17.Previous song/Volume up18. LCD display19.Mode function button20. Infrared receiving window

74. NOMENCLATURE AND FUNCTIONS4.3 REAR PANELEMC INAUDIO AUX2AUX1 OUTPUT INPUT70V/ 100VOUTPUTCOM COM COM MUTEFM ANTG+70V100V2122242523262728293021.AC power input socket22. Cooling fan23. 100V / 70V speaker output switch24. MUTE mute control25. FM radio antenna interface26.AUX1 input interface, used to connect AUX output interface27.AUX2 input interface28. Line output interface, used to connect the line input interface29. EMC input interface30. 100V/70V output interface

85. OPERATION ILLUSTRATION1.Connect the speakers:①When the 100V and 70V selector switch to70V position, as shown below:②When the 100V and 70V selector switch to100V position, as shown below:Note:1. Before connecting the speakers, please make sure that the equipment is powered off. In thecase of power on, may have the risk of electric shock.2.Please make sure there are no applied load to the speaker cables.
3. During the installation of speakers, please make sure that the sum of the rated input powerof the speakers to be connected is less than rated power of equipment.2.Connect external devices:①Please ensure that the equipment and all equipment will be connected are powered off.②Using the corresponding cable to connect this equipment and other external equipment.3.Connect the power line and turn it on:①Please make sure that the power switch of equipment and its connected equipment areturned off (in the OFF position).②Turn the volume knob to the left③Connect the supplied power line to the AC IN interface④Plug the power line into the applicable socket⑤Turn on the connected equipment (CD player, etc.), and then turn on the equipment.
Note:1.Before powering on, please check and make sure there is no problem with the cable and connection.2.When you turn off the system, turn off the equipment, and then turn off the connected equipment.70V/ 100VOUTPUTCOM COM COM Maximum output voltage: 70VSPK-SPK+70V100V70V/ 100VOUTPUTCOM COM COM Maximum output voltage: 100VSPK-SPK+70V100V

95. OPERATION ILLUSTRATIONNote:1.Turn off the power switch,Please wait about 5 seconds before turning on again.Continuous rapidturning on and off the power switch,it will lead to equipment failure.
2.Even the switch is in the off status, there will be a little current in equipment. If it won’t use theequipment in a long time, please unplug the power cord from the wall AC socket.
4.Microphone using:1.Turning the volume knob to the left,Connect the microphone and microphone input interface.2.Turning the volume knob in the right position.3.Facing the microphone and Speak loudly, turn the volume knob to the right, until the output signalno longer distortion.If input is high but output is low voice, and then increase the volume by usingthe volume knob.If the speaker volume is very high, then reduce the volume by using the volumeknob.5.Shutdown the system:1.Turning the volume knob to the left until the minimum position.2.Turning off the panel power switch of the professional power amplifier, at 0ff.In turn shutoffprocessor equipment and audio source equipment.6.Built-in MP3 player operation method:The buttons are explained as follows:S.NoButtonsFunction/Mode function button; FM / USB / BT / playing (Long press this button to forcibly turn on / off the machine)1
/
6
/
2Previous song (long press to increase volume)3Mp3 loop playback function button; (with Repeat One / Repeat ALL / Random / Repeat Folder mode.)4Play / Pause (long press this button in FM mode to receive the station)5Recording function button; (press this button in PLAYING mode to record) (Long press the Record button to switch between recording and USB playback)Next song (long press to decrease volume)USB functionPress the MODE button to select the USB mode, copy the MP3 file in the U disk (below 32G), and it supports MP3 / WAV / WMA / AEC / FLAC format.TFUSBIR

105. OPERATION ILLUSTRATIONTF card functionInsert a TF card (below 32G) to copy the MP3 file, and it supports MP3 / WAV / WMA / AEC / FLAC format.FM (Radio reception) functionPress the MODE button to select the FM mode, and then long press the PLAY / PAUSE button to automatically receive the radio station. The radio stations received (depending on the sound received) depends on the venue. Bluetooth functionPress the MODE button to select the Bluetooth mode, turn on the mobile phone Bluetooth for connecting, it can play normally when the mobile phone is 10 meters barrier-free away. Bluetooth default name is "BP10_BT". MP3 song loop playbackIn USB or TF card mode, play a song at will, press the mode button to switch between REPeat One / REPeat ALL / Random / REpeat Floder.Functional memory functionYou can turn it off by the remote controller or long pressing the MODE button. After it is turned on, it can remember the function mode selected before. If you unplug the power cable and turn it on again, the default is Bluetooth function mode.Recording functionIn the PLAYING mode, press the lower left Recording button to record and store in the USB flash drive. It shows the current specific number of recordings and recording time. If you want to end the recording, you can long press the Recording button to complete recording and play the current recording file. In USB playback mode, long press Recording button to switch between USB songs and recorded files for playback.Volume +/- Long press the Previous Song button to increase the volume quickly, and long press the Next Song button to decrease the volume quickly.

116.TROUBLESHOOTINGFailure phenomena Failure cause1. Power switch is not opened1.Power line is cut off2. The protection function of the equipment isnot activated2.All lines are connected, but there isno sound.1. The power switch is not opened or the powerplug is bad contacted.2. The fuse is burnt3. The volume knob is not opened or turned downto a extra low level4. There is no audio signal input5. There is short-circuit in the speaker line.3. The sound suddenly disappears innormal status.1. The equipment is in very high temperature tomake it into protection status.2. The connection wire is bad contact.4. Low soundThe equipment is set to be low impedance connection, but the speakers connected is with high impedance.5. Sound is distortedThe input level of Mic or external equipment is too high

EMC INAUDIO AUX2AUX1 OUTPUT INPUT70V/ 100VOUTPUTCOM COM COM MUTEFM ANTG+70V100V7.APPLICATIONSREAR PANEL CONNECTIONS12AC Power Input70V/100V SpeakersMIC1 InputCD PLAYERCD PLAYERMIXER AMPLIFIER External FM antennaVOLPLAYMSGMIC in PLAYSIRENREC inONOFFSTANDBY
PLAYALARM MODERECORDSTOPSTARTALARMING SIGNAL GENERATOR

138. BLOCK DIAGRAM
Amplifier outputMIC1ENC INAUX2AUX12-STAGE EQBASSTREBLELEVELMP3/BT MODLE120W/240WLEVELLEVELLEVELMUTE_MIC1MUTE_ALLQ2GNDMUTE_ALLQ1GNDMUTE_MIC1AUDIO OUTLEVELLEVELDisplay Protection circuitLCD displayFun control Amplifier moduleSwitchover between 70V and 100VDC 24V inverter power supplyswitching power supplyRemote controlButtonBP1048B2
(Crystal: 24MHz)
BT Antenna
2402 ~ 2480MHz

9.SPECIFICATIONSMIC input: + 5mV, unbalanced 6.3 connectorAUX input: 350mV, unbalanced RCA connector70V/100VSpeaker OutputInput Sensitivity&Source ImpedanceRated Power OutputModelSFB240
240WFrequency ResponseShort circuit, overload and overheating protection.≥75dBRated power output, distortion ≤ 1%MIC 1 has the priority than other inputS/N RatioT.H.DPriority functionBass: 100Hz±10dB，Treble: 10KHz±10dBTone80Hz~16KHz(-3dB)SFB120
120WProtectionDimensionWeightPower Consumption320W300×88×280mm4.1Kg180W3.9Kg
Input power
~110V 50Hz ~120V 50Hz ~220V 50Hz ~230V 50Hz ~240V 50Hz ~110V 60Hz ~120V 60Hz ~220V 60Hz ~230V 60Hz ~240V 60Hz14

PUBLIC ADDRESS SYSTEMVersion 0.4FCC Statement
This equipment has been tested and found to comply with 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
generates, 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 turning the
equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•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.
Caution: Any changes or modifications to this device not explicitly
approved by manufacturer could void your authority to operate this
equipment.
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, including interference that may cause
undesired operation.
RF Exposure InformationThis equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator and your body.