Question about Fender 4 Channel Powered Mixer with 10 in Speakers System

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Need schematic for fender LTB type 345 - Fender 4 Channel Powered Mixer with 10 in Speakers System

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SOURCE: Fender LTB 4-channel PA gets distorted after use

1st
make sure your speaker total load impedance is not lower than 4 ohms.
Remember- if you have a pair of 8 ohm speakers plugged in your load will be 4ohms.
SO...if you add another speaker it will drop below 4ohms.
OR.. if you are not using the original 8ohm speakers, they must be combined to make a total impedance load of 4ohms or more using series or parallel combination in the hookup.

Also
the output transistor could be the cause. with the covers off, looking at the two power transistors mounted to the heat sink, one is probably bad. Part # DE9744 or the other one MJW21191. You should NEVER pull the covers off with the unit plugged into the wall unless you have at least SOME training in service work and you know what NOT to touch while the unit is plugged in.

If you are not sure what youre doing... Take it to a qualified service technician ! Deadly voltages are present and could KILL you if you are not carefull.

Another thing - never power up an amplifier without speakers plugged in. You might get away with it once but eventually it will take out the output transistor (s). Even if you know that an amplifier has overload protection, it is not a good habbit to get into.

That might have been the cause of the problem to begin with.Hope this helps.
"Enjoy music, for without music of all kinds, this life would be at a great loss"
10_28_2011_4_11_12_pm.gif

Posted on Oct 28, 2011

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1 Answer

Fender LTB 4-channel PA gets distorted after use


1st
make sure your speaker total load impedance is not lower than 4 ohms.
Remember- if you have a pair of 8 ohm speakers plugged in your load will be 4ohms.
SO...if you add another speaker it will drop below 4ohms.
OR.. if you are not using the original 8ohm speakers, they must be combined to make a total impedance load of 4ohms or more using series or parallel combination in the hookup.

Also
the output transistor could be the cause. with the covers off, looking at the two power transistors mounted to the heat sink, one is probably bad. Part # DE9744 or the other one MJW21191. You should NEVER pull the covers off with the unit plugged into the wall unless you have at least SOME training in service work and you know what NOT to touch while the unit is plugged in.

If you are not sure what youre doing... Take it to a qualified service technician ! Deadly voltages are present and could KILL you if you are not carefull.

Another thing - never power up an amplifier without speakers plugged in. You might get away with it once but eventually it will take out the output transistor (s). Even if you know that an amplifier has overload protection, it is not a good habbit to get into.

That might have been the cause of the problem to begin with.Hope this helps.
"Enjoy music, for without music of all kinds, this life would be at a great loss"
10_28_2011_4_11_12_pm.gif

Feb 09, 2010 | Fender 4 Channel Powered Mixer with 10 in...

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