Question about Soundcraft *new* Soundcraft Epm8 Analog Mixer - Epm 8

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I need meter voltage from power suply. what voltage a suply.

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In this device the 48 volt(dc) is used for phantom power . and the o/p volt is from the red cable are 36volt,56volt 56volt and 75volt all in dc. take red as ref.

Posted on Jun 17, 2011

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I get a distorted sound from my speakers throug a Phonic Helix Board. It is connected on a PC through Fire Wire. The distortion is also there while using microphones or other inputs (CD-players etc.). It...


Hallo landgenoot ;)

It seems it is a power supply problem; distorted sound, no meters, solo buttons not working, headphones low level and distorted. One of the power supply voltages might be too low or even missing. The Helix series mixers use mainly 4 supply voltages: + 15 V and - 15 V for the analog part (audio), + 5 V for the DSP and logic and +48 V only for the phantom power. If for example the + or - 15 V is too low, clipping of the positive or negative parts of the waveform (dependng on which voltage is too low) will occur. If possible, first measure the voltages coming out of the power supply. You could use a metal part of a jack as ground reference.
For the FireWire board an extra voltage supplied by the switched PSU is used. It is specified as +12,2 V, but I measured 14 V. This voltage is lowered to + 5 V by a resistor on the FW board and a 7805 regulator. (Not very efficient!) But as far as I can see, the FW voltage is not the problem here. I have some service documentation of the Helix series mixers (12, 17 and 24, so if you need more you can conatct me: frankdevries [at] versatel.nl.

Groeten, Frank.

Mar 18, 2011 | Phonic Helix18fw 18 Channel Mixer with...

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Soundcraft EPM12, need power suply schematic pls.


This isn't your model BUT it is likely so similar as to be close enough to work a power supply problem.

http://elektrotanya.com/soundcraft_folio_f1-6-i-p_mixer.pdf/download.html

These companies don't change designs very much between different models.

Feb 07, 2011 | Soundcraft Epm12 Analog Mixer - Epm 12

1 Answer

Power suply


If the power supply fried, it is likely one of the power amp channels, usually the rearmost one has fried. There is a weak insulation thing between layers of the multi-layer circuit board that shorts.

DO NOT replace a fuse in a failed unit till problem is fixed as you will LIKELY do more damage!!!!

Nov 16, 2010 | Behringer Europower Pmp5000 Powered Mixer...

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I have a Phonic Helix Board 24 firewire MK2 When i open it all the peak led stays open I think the power suply is busted I need an expert


The power supply uses three, 3 terminal regulator chips. You should find +/- 15 volts and +5 volts DC from those. There are two fuses, one for each polarity. If one of those is blown, that would cause the problem and one would need to find WHY it blew before replacing it.
You need to find a competent electronics repair person.

Nov 02, 2010 | Phonic Helix18fw 18 Channel Mixer with...

1 Answer

My mixer wont power up. the only light that comes on is red led +48 v


This MAY be a power supply problem. We need to find if the power supply is putting out what it is supposed to. Using a meter, put one probe in pin 1 (ground) of one of the mic connectors, say channel1. Put the other probe in either pin 2 or 3 of another mic connector... Note we are using different connectors as there often isn't enough clearance for the probes in the same one... With Phantom power turned on and LED +48 lit, how much voltage do you read? If it is say 40 volts or more, then power supply is operating.

If the supply is operating then a POSSIBLE problem is a connector has fallen off where it connects to the supply or the main board.

The power supply provides several voltages such as 5 volts, 12 volts and 15 volts of various polarity.

If the 48 volt supply is found to be operating with the above test, then since the switcher and transformer are shared, it is likely the other voltages are available.

CAREFULLY open the unit and look for a loose cable.

PLEASE NOTE: This is a switching type power supply and part of the supply runs at power line potential. Only work on the supply if you are skilled and have an isolation transformer for your own safety.

Sep 21, 2010 | Behringer XENYX 2442FX Mixer

1 Answer

Mixer not working and board getting hot


There is likely a voltage regulator or a diode burned out in the vicinity of the power supply. If you have the schematic, start at the power supply and work through the circuit to the I.C. Also look up the pinout on the internet for that I.C. With the power on test the voltages at each pin on the I.C. You should not have supply voltage readings on any of the signal pins. This is an indication that the I.C. is also burned out. Use a volt ohm meter with a D.C. voltage setting. Also hopefully your meter should have a diode test function. If not you can still test them with the resistance test function.Here is a link to an explanation:http://www.elexp.com/t_test.htm I hope this helps.

Mar 03, 2010 | Vestax Pmc 280 DJ Mixer

1 Answer

I have a Casiotone MT70 made in 1984. How do I check the polarity as I need to get an AC Adaptor and don't want to damage the keyboard?


Here is how you might check the polarity of a 7.5 volt DC replacement adapter:

Put the 5 batteries into the unit and verify operation. NOW using a DC voltmeter measure the voltage from battery negative and meter negative connected and meter positive to the pin on the power jack. IF you see 7.5 volts positive, then the pin is the positive lead for the adapter.

If you see zero, then continue testing.

With the 5 batteries inserted, connect the positive meter lead to the positive of the stack of batteries. Now touch the negative meter lead to the pin.
If there is 7.5 volts there, then the pin is the negative lead for the adapter.

READ THESE INSTRUCTIONS CAREFULLY.

USUALLY the jack has a contact that disconnects the batteery when the plug with sleeve is inserted.. We are testing the jack without inserting a plug here so the plug should HAVE THE BATTERY VOLTAGE with correct polarity on the pin.

Oct 07, 2009 | Casio Music

1 Answer

Yamaha CVP 309-When I power it up, red power light comes on, but


You have to remember that the voltages coming out of the power transformer are A.C. and the voltages used by the devices in the keyboard are D.C. Check for voltage rectifier I.C.s between the transformer and the rtest of the circuits. They should look like squares with 3 pins coming out of the bottom of them and metal backs that protrude above the top of the black squares. Use a volt ohm meter on direct current range and clip the black lead to a circuit ground such as a ground on an output jack. Touch each pin one at a time taking note of the voltage. If you find one that has the same voltage on all 3 pins it is probably shorted. I think the voltage should be about 12volts direct current positive or negative depending on the circuit. Each one will have a code that you can cross reference on the net to find the pinouts and specs. The same thing goes for all the I.C.s If you can find the pinouts for any that you suspect look for the power supply pins and check what the voltage is. Some will have two supplies, one negative and the other positive. If you find an I.C. with power at all pins or ones that should have no power only signal then it is likely shorted. Go slowly and don't bridge two pins at once by accident and you might be able to find the problem without the schematic or a service manual. There is a memory battery (CR2032) that power the memory that might be dead but that should only affect the programmed sounds not the LED or the amp chip. Hope this helps. Do not measure A.C. with the D.C. range or you'll burn out your meter. Use safety precautions with a live device.

Aug 10, 2009 | Music

1 Answer

Peavy viper 75 watt modulating amplifier stops getting power.


Your are on the right track. This fuse may look good but still be bad. once you in there all ways replace with new, it helps extend the life. 95% sure it s the fuse. If not it will need to go on the bench. Good luck DFD

Apr 11, 2009 | Peavey Music

1 Answer

I plug in my casio ctk-800 and it does not turn on when i press the on button


If you lucky, the power jack may be at fault since it switches from external to internal battery, but most likely the internal supply is what's damaged... IC regulator possibly. A quick voltage check with a volt meter at the power leads on the main board will verify battery or xfmr supply voltage, if voltage is present then look in close proximity for an IC regulator and check for an output.

Jul 21, 2008 | Casio Lighted Keyboard LK90STADMC

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