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When the set gets dirty, wipe with a soft, dry cloth. If
the set is extremely dirty, soak a soft cloth in a 5 to 6%
solution of dishwashing detergent to water, wring it
tightly, wipe the dirt away, and finally wipe the set with
a dry cloth.

Never use alcohol, thinner, benzine, insecticide or other
volatile agents, as they may damage the surface paint
or gloss of the set.
Also do not wipe the set with a chemical cloth or leave 
it on the set for a long period, as the surface finish may 
be damaged or the paint may be stripped off.

  Should problems occur, they are, in many cases, due to      If the problem cannot be remedied after the following
  simple operation mistakes or the like. On the basis of         checks, please consult your dealer.
  the following checks, you will be able to rectify a 
  number of problems yourself without difficulty.

The karaoke performance you enjoy may be disturbing noise to others.When performing karaoke,be sure to be 
considerate of your neighbors.
The volume of karaoke is at your command. Remember that even small sounds transmit very well in the quiet night. 
Be specially careful in karaoke performance at night.it is recommended to close the windows to avoid sound 
leakages to the neighbors.Avoid noise pollution to protect the comfortable living environment of those around you.

ETIQUETTE OF SOUND

MAINTENANCE

TROUBLESHOOTING

TROUBLESHOOTING

Bad cable or poor contact.

Make sure that all cables are not damaged and all 
contact points are proper. 

No microp-
hone sound

The microphone cable is not plugged into the 
microphone input jack properly.

Make sure the microphone cable is plugged into the 
microphone jack properly.

The switch on the microphone is set to “OFF”.

Set the switch on the microphone to “ON”.

The corresponding INDIVIDUAL MIC VOLUME control or the 
MASTER MIC VOLUME control is in the minimum position.

Adjust the volume control.

The U-shaped connector is not inserted into the MIC 
EFFECT jacks or not properly inserted.

Make sure the U-shaped connector is  properly inserted 
into the MIC EFFECT jacks.

A condenser microphone is used.

Change the condenser microphone to a dynamic microp-
hone or a condenser microphone accepting battery power.

Humming 
noise

Grounding problems between two adjacent equipments.

Try to use an isolator to remove the grounding problems.

PROBLEM

POSSIBLE CAUSES

SOLUTIONS

No power

Power is off.

Turn on the mixer.

AC power cord is unplugged.

Plug the AC power cord to an AC power outlet (120V).

The fuse inside the transformer is open.

Send the mixer to an authorized service center.

One Side 
No Sound

One bad RCA cable or one poor RCA contact.

Make sure that all RCA cables are not damaged and all 
RCA contact points are proper.

One U-shaped connector is not inserted into the 
music effect jacks or one U-shaped connector is not 
properly inserted.

Make sure all the U-shaped connectors are properly 
inserted.

Distorted 
sound

The electrical signal from the output of the player to 
the mixer is over the limit of the input of the mixer.

Turn down the master volume control of the player and 
turn up the volume control of the mixer to maintain the 
same sound level.

Incorrect AC Voltage (The AC power cord is plugged 
to a 240V outlet or to an unstable 120V outlet).

Make sure the AC power cord is plugged to an AC power 
outlet with a correct and stable AC voltage.

No sound

Incorrect input selection.

Make sure the input source selection button is set correctly.

The input level on the rear panel is set to the minimum 
position.

Adjust the input level control.

Music volume control knob is turned all the way down 
(zero sound output).

Turn the music volume knob to a position that the 
sound level is desired.

Both U-shaped connectors are not inserted into the 
music effect jacks or not properly inserted.

Make sure all the U-shaped connectors are properly 
inserted.

Summary of Contents for AKJ7404

Page 1: ...AL ECHO KEY AND FEEDBACK CONTROLS Thank you for purchasing the Audio2000 S professional karaoke mixer with digital echo key and feedback controls To achieve maximum performance from your new unit please read this manual thoroughly and retain it for future reference For more information please visit our website www audio2000s com R 4 1 A C C 7 03 ...

Page 2: ...NIT SAFETY PRECAUTIONS MAINTENANCE TROUBLESHOOTING ETIQUETTE OF SOUND SPECIFICATIONS IMPORTANT For your protection please read these instructions completely and keep this manual for future reference Carefully observe and comply with all warnings cautions and instructions placed on the equipment or described in the operations instructions to guard against injury TABLE CONTENTS 1 2 3 3 3 4 5 6 7 8 9...

Page 3: ...rating and maintenance servicing instructions in the literature accompanying the appliance CAUTION TO PREVENT ELECTRIC SHOCK MATCH WIDE BLADE OF PLUG TO WIDE SLOT FULLY INSERT ATTENTION POUR EVlTER LES CHOCS ELECTRIQUES INTRODUlRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPON DANTE DE LA PRISE ET POUSSER JUSQU AU FOND CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR ...

Page 4: ...y from heat sources such as radiators heat registers stoves or other appliances including amplifiers that produce heat 11 Power Sources The appliance should be con nected to a power supply only of the type des cribed in the operating instructions or as mar ked on the appliance 12 Grounding or Polarization The precautions that should be taken so that the grounding or pola rization means of an appli...

Page 5: ...molding of the plug and pull Power consumption of AC power outlets Be careful that the total power consumption does not exceed the wattage marked on the rear panel Do not connect other appliances than the system components to the power outlets of this unit Do not connect a TV set to this unit even if the power consumption value marked on a TV set is below the permissible limit of this unit A large...

Page 6: ... front panel 2 A This control knob adjusts the microphone input level from the MIC INPUT 2 jack front panel and the MIC INPUT A jack rear panel 3 B This control knob adjusts the microphone input level from the MIC INPUT 3 jack front panel and the MIC INPUT B jack rear panel Normally set these control knobs to the center positions MICROPHONE INPUT JACKS 1 2 3 These jacks are for connecting micropho...

Page 7: ...can be adjusted between 12dB and 12dB KEY CONTROL BUTTONS b Lowers the music key one step each step is 1 4 note each time this button is pressed Resets the music key to its natural key Raises the music key one step each step is 1 4 note each time this button is pressed Note The key will stay until it is changed further ECHO TONE BASS MID TREBLE CONTROLS These controls are used to boost or cut the ...

Page 8: ...CD player to these jacks AUX Connect the audio output of any auxiliary component such as a cable broadcasting tuner to these jacks BGM Connect the output jacks of the BGM background music player to these jacks 230V 115V 230V 115V Voltage Selector AC IN 115V 230V 50Hz 60Hz PRE OUT OUT IN MIC EFFECT MIC EFFECT INPUT OUTPUT JACKS VOLTAGE SELECTOR VIDEO INPUT JACKS DVD VCD AUX BGM DESCRIPTIONS AND FUN...

Page 9: ...S The MIC EFFECT allows the AKJ7404 user to add any sound effecter such as an equalizer as a part of the microphone loop in the AKJ7404 unit If a sound effecter is not used check to make sure that the U shaped connector is connected from the IN jack to the OUT jack If a sound effecter is to be placed in between the IN jack and the OUT jack the U shaped connector needs to be removed from the unit a...

Page 10: ...V 115V 230V 115V Voltage Selector AC IN 115V 230V 50Hz 60Hz PRE OUT OUT IN MIC EFFECT 8 DVD VCD Video Deck Cassette Deck BGM Graphic Equalizer Power Ampilifer MIC MIC TV Monitor MIC EFFECTOR TV Monitor TV Monitor TV Monitor ...

Page 11: ...PRINCIPLE OF AUDIO VIDEO SWITCHOVER PRE OUT 9 1 2 ...

Page 12: ... the ECHO VOLUME control knob Press the KEY CONTROL buttons to set the desired key Connect a desired number of microphones to the microphone inputs on the AKJ7404 Notes for Proper Use of a Microphone Hold a microphone to have the top of its windscreen 1 to 2 inches away from your mouth To get the best pickup result point the microphone toward your mouth To ensure a clear vocal output do not block ...

Page 13: ...me The LED on the MUSIC VOLUME CONTROL knob on the front panel of the main unit blinks during the adjustment A fine adjustment is available by pressing the button intermittently MIC VOLUME These master microphone volume control buttons are used to raise or reduce the microphone volume The LED on the MASTER MIC VOLUME CONTROL knob on the front panel of the main unit blinks during the adjustment A f...

Page 14: ...n or flammable objects such as paper and matches through the ventilation holes or other openings on the unit for this will cause malfunction or hazard of fire and electric shock In case water or a foreign object enters inside the unit consult an authorized service center or your dealer for a check up Hold the power plug when plugging or unplugging the power cord Do not pull the cord or touch it wi...

Page 15: ... is in the minimum position Adjust the volume control The U shaped connector is not inserted into the MIC EFFECT jacks or not properly inserted Make sure the U shaped connector is properly inserted into the MIC EFFECT jacks A condenser microphone is used Change the condenser microphone to a dynamic microp hone or a condenser microphone accepting battery power Humming noise Grounding problems betwe...

Page 16: ...B 10KHz Microphone BASS 10 10dB 100Hz MID 5 5dB 2KHz TREBLE 10 10dB 10kHz Key Control Range 13 steps 3tones Video Input Jack Sensitivity Input impedance 1Vp p 75 Video Output Jack Output level Output impedance 1Vp p 75 Ω Ω Ω Ω Ω Ω Power Supply Supply Voltage AC 115V 230V 50Hz 60 Power Consumption 30W Dimensions W X H X D 17 0 X 5 2 X 17 1 Weight 14 3lbs Accessories Remote Control Unit 1 AAA Batter...

Page 17: ...ng carton Also enclose a note describing the problem along with any other helpful information such as where and how the unit was used LIMITED WARRANTY H F Technologies Incorporated H F hereby warrants that Audio2000 S products will be free from defects in material and workmanship for a period of 1 one year from date of purchase At its option H F will repair or replace the defective product and pro...

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