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Any known part on power pcb that goes bad? - Behringer XENYX 2442FX Mixer

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  • digitalri May 06, 2010

    fredy2 -

    thnx for ur reply. This is more of a heat, or time delayed issue. After about 20mins I get distortion across all inputs/outputs.

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  • Behringer Master
  • 5,603 Answers

There are no chronic failure parts.

Faders that get contamination in them can be a problem.

The external driver chips CAN be damaged when people connect the unit to amplifiers that are run from a power source at opposite ends of an auditorium for example, due to common mode ground loops and faults.

Setting up a system is one part knowing what equipment is needed and one part electrical engineering regarding safe interconnection of low level audio signals.

Posted on May 06, 2010

  • Fred Yearian May 07, 2010

    That sounds like a power supply problem...



    With heat related part failure QUICKEST way to find failure is using circuit cooler or "freeze mist".



    Check the supply voltages during failure.

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Hi, There are several common reasons why this and most similar keyboards have this problem.
If you can fit known good batteries, and it works, this confirms the problems will be with the external power supply or connection.
Usually batteries are not available, so.......
Do the obvious.
  1. Is the power supply plugged into a known good mains socket?
  2. is the mains socket switched on?
  3. is the power supply plugged into the keyboard?
  4. is the keyboard switched on?
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(You do not have to buy an expensive replacement power supply, a universal, regulated one, with a selection of connectors will be fine. Supermarkets and the like sell them.)
The manual, or a label on the bottom of the keyboard will tell you the voltage, current consumption, and whether the current is AC or DC.
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A TYPICAL power supply is likely to be:-
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Important
The power supply needs to be REGULATED.

Polarity
This is the way round the connector is wired.
Usually the center is negative (-) and the barrel is positive (+)
This information is molded into the plastic or on a label next to the socket.
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Fault finding
The most common fault is the power connector being broken or the solder has been broken.
Slowly moving the connector round, to find it works in some positions, is a sure indication that is the fault.

Repair is quite simple, but there are a lot of screws to take out.
Ideally, drill a hole in the case, where convenient, and fit a metal connector. Now connect to the PCB, in place of the original socket, with flexible wires.
Other wise if it is just solder failure, re solder and glue the socket with epoxy resin (Araldite) or hot glue from a glue gun.
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Hi, This is a copy and paste from a similar question, please excuse my laziness........

Hi, There are several common reasons why this and most similar keyboards have this problem.
If you can fit known good batteries, and it works, this confirms the problems will be with the external power supply or connection.
Usually batteries are not available, so.......
Do the obvious.
  1. Is the power supply plugged into a known good mains socket?
  2. is the mains socket switched on?
  3. is the power supply plugged into the keyboard?
  4. is the keyboard switched on?
If the power supply is not the one supplied with the keyboard, then check it is compatible.
(You do not have to buy an expensive replacement power supply, a universal, regulated one, with a selection of connectors will be fine. Supermarkets and the like sell them.)
The manual, or a label on the bottom of the keyboard will tell you the voltage, current consumption, and whether the current is AC or DC.
Invariably the current is DC.
All the Casios I have are 9 Volts, (9V) and very few are more than 300 milli amps (300mA) More milli amps is fine, so the current can be the same or greater.
A TYPICAL power supply is likely to be:-
  • 9 V
  • 300 mA or more
  • DC
BUT DO CHECK
Important
The power supply needs to be REGULATED.

Polarity
This is the way round the connector is wired.
Usually the center is negative (-) and the barrel is positive (+)
This information is molded into the plastic or on a label next to the socket.
On a replacement (universal) power supply, there will be a set of connectors, and when you have selected the correct one, the arrow on the end of the lead should point to the correct polarity symbol on the connector.

Fault finding
The most common fault is the power connector being broken or the solder has been broken.
Slowly moving the connector round, to find it works in some positions, is a sure indication that is the fault.

Repair is quite simple, but there are a lot of screws to take out.
Ideally, drill a hole in the case, where convenient, and fit a metal connector. Now connect to the PCB, in place of the original socket, with flexible wires.
Other wise if it is just solder failure, re solder and glue the socket with epoxy resin (Araldite) or hot glue from a glue gun.
Hope this helps, Chris.

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1 Answer

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http://www.line6.com/support/serviceCenters/

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