Question about Allen & Heath Gl240032 4 Bus 32 Input Live Sound Console

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Power Board will not power up at all. Fuse is good. Power supply cord is good. Just wont power up

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Probably the on-board voltage regulators. Little square thingies with three feet. LM1508 or LM1509 or so. Measure the voltage on the third foot and see if they are working. Be good.

Posted on Apr 15, 2014

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Does my Casio g-200 keyboard have a fuse ? If so what type and where is it ?


I'd go exchange the power supply for the correct one (check the voltage, polarity and mA rating that's marked next to the power input). It may be too late, though.
There will be a fuse on the internal power input board, as well as one in the power supply, but if the instrument is turning on and lighting up, it's not a blown fuse.

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Model Yamaha ME-50 no power


John
With AC power off.
Use a meter (on Ohms scale) to check internal fuse for blown (open) fuse.
If you feel qualified & safe with AC Power On.
Check input to internal power supply on AC Scale (Caution when AC is on) for volts in.
Use meter on internal Power Supply for "probably" DC volts leaving internal Power Supply electronics to power the rest of the electronic circuits.
Switch mode power supplies can break down. They stop doing their high frequency switching so they don't convert AC to DC.
If this P/Sup is a separate box or circuit board, inside the unit, then it can have a part number & be replaced.
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1 Answer

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Make sure the plug for the power cord is the same polarity and DC or AC for the mixer. Also make sure the inner diameter is correct for the station power jack as well.

As long as power from the supply is correct and adequate, theother potential sources of problems can be a blown internal fuse, broken power jack circuit tracks/traces, bad solder joints, dirty switch contacts, some contact cleaner sprayed in the gap of the switch toggle and then flipped rapidly for a number of times might clean it up.

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I recently got a Marshall mg100hdfx head for free because it wont turn on, so I am investigating possible parts that may need replacing. The only description I got as to why it wont turn on anymore is...


You may find almost anything in this. I think the power amp is on a separate board so the connections to that might have been broken. Possibility include cracks in the circuit board. First thing is to do after visual check is to check power supply voltages to verify power switch/fuse/transformer/rectifier/capacitor/regulator health. Switches are sometimes damaged... and also wires can fall of or break.

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1 Answer

Behringer Xenyx 2222fx doesn't power up. I've replaced the fuse and power cord, still nothing. When you flip the phantom power switch, the red +48V indicator light comes on on the front. Other than that,...


The Phantom power comes from a seperate winding on the switching power supply.Likely one or more of the other voltages are not present due to a failure of one or more components. The supplies are current limited so a short anyplace on the board may cause the problem. I had one of these short betwen the +/- 15 volt busses because somebody spilled liquid into it.

Here is a close schematic... a slightly different model with less channels, but circuoitry is the same, just more copies of it in yours: I believe it is zipped with four files... the last is the power supply.

http://elektrotanya.com/behringer_xenyx-1222fx_v1000_dpm5m_ub-spsu2_sch.zip/download.html

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2 Answers

It doesnt power up all of a sudden, for no apparent reason.


This is likely a pwer supply problem... BUT do check that the power cord is properly seated... pretty common that these work loose.

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1 Answer

Samson MDR8 blowing internal power supply fuses. Is there a wiring schematic of the power supply board available


Here is a troubleshooting hint:

Put an incandescent lamp in series with the hot side of the power cord. This acts as a resetable fuse while troubleshooting so you don't blow fuses.

Schematics are hard to come by, but power supplies are easy to trace the circuitry.

Check filter caps and the diodes and THEN look for hot (temp) IC's and transistors.

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1 Answer

I have a lowrey organ and when i plug it in it does nothing . no power at all anybody got any ideas


If you feel comfortable doing it you could try removing the back and examining the power supply. Make sure the power cord is not plugged in. Remove the screws holding the back on the organ. Look to see where the power supply is. It will be a fair sized metal box that the power cord comes out of. Look for a fuse holder on the box.If there isn't one or you already checked the fuse look to see how the power supply is fastened down. If you can remove it you can check the power cord from the plug end to the connection in the power supply with a volt ohm meter on the lower resistance scale. Check both sides of the power cord . Look for an internal fuse soldered into the circuit if there is one. Check it also. You can also check the power switch the same way. Think of the power cord and switch etc as a garden hose. You want to make sure that the flow of electricity is not interrupted any where between the plug and the power transformer. Do all these tests with the cord unplugged. Also avoid touching anything connected to the filter capacitors as they store dangerous amounts of electricity. If none of this helps note the plug that connects the power supply to the organ. Unplug it and take the power supply in to be tested. A good piano service place should be able to direct you to someone. Also remember that something had to make the power supply fail if it is indeed faulty. None of this is simple or recommended for a person who has no experience with electricity or electronic repair. If you feel at all hesitant about doing it you are better advised to consult a repair person. If you do have experience but no schematic you can still usually find the problem with careful thought and procedure. Break the circuit down into modules and test them one at a time starting with the power supply. It could be something as simple as a frayed cord or blown fuse to something as complex as a burned out transistor or faulty tube ( in the case of older organs) causing the power supply to fail. I once repaired a home organ that the power supply blew in again because of the customers house wiring. That particular wall plug in had been wired improperly. Hope all this helps.

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1 Answer

Blown fuse and replaced it and burned the amp


BIG problem! You should NOT have replaced the fuse as additional damage has been done. I repaired a PMP5000 and I can tell you likely what you will find: The smoke and smell came from two power resistors that are part of the soft start circuit that now are toast. You will likely find several components in the main portion of the power supply that are toast. These will include transistors, resistors, diodes, and probably the small 8 pin switching regulator chip. There is a small power supply that comes on first which enables a relay that shorts out those soft start resistors AFTER the power amplifier BALANCES and normalizes.
The unit I repaired had severe damage due to arc-over at one power amp section. Three power transistors were destroyed there and board traces and charring had to be handled in that section.
The repaired unit had to be brought up with a light bulb in series with the line power cord to prevent further damage until all bad parts were discovered and repaired. You will need to take the unit to a shop that is expperienced with the product. The repair cost MAY be pretty high.

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