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Do not power on

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Fuse power amp is good I have power on power supply but the amp does not turn on what meaning is this?


Probably a bad transformer? Do you have power on the secondary side? Power in is one thing power out is another, hope this helps?

Mar 02, 2015 | Fender Frontman 212R 100W 2x12 Guitar...

1 Answer

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.
Good Luck

Jul 14, 2014 | Yamaha Music

1 Answer

I have a Focusrite Pro 10 i/o Firewire Interface and am experiencing 60 Hz hum through the mic pres when phantom power is switched on with the power supply attached. Phantom power running from 6-pin...


I assume you are using condenser mics as you would NOT be using phantom power with any other type connected or other devices plugged in while you have phantom power. It is important to have ALL interconnected equipment, including the computer, powered from the SAME receptacle or power source. Make sure the power supply you are using is SPECIFICALLY for the unit from Focusrite as some supplies have filtering within the wall transformer module and others do not. The power supply MAY be generating magnetic fields... try moving it around and see if hum is affected. The capcitive coupling in a power supply can let in higher frequency components from lamp dimmers. Make sure you have no lamp dimmers anywhere near the equipment.

Apr 25, 2011 | Focusrite Saffire Pro 26I/O 26 In/26 Out...

1 Answer

My Roland kc 550 will not power on.


Hello,

if it does not power up, then it means its having a power problem. it might have worked fine in the past, but that's electronics for you. Power surge, irregular power supply, excess power supply, etc can affect the unit thereby not making it to power on.

This unit must have a power supply board in it where power enters from the mains. A capacitor, fuse, diode, etc may have been defective on the power board and maybe that's why its not making the unit turn on. There might also be some disconnection or something, inside the unit which is not making it to power on.

To actually find out what's wrong, you need to disassemble the unit with a screw driver and check what's wrong. You will be needing a meter in order to test the components on the power board, once you detect any bad component, you can make necessary replacement at any electronics accessories store withing our vicinity. This is the only way by which you can detect the problem.

Of course, testing the power board with a meter will require someone that has the ability. So it you can't, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.

I wish you the best of luck.

Take care........

Mar 21, 2011 | Roland KC550 Amp Keyboard

1 Answer

Bought a powered monitor as it said to do even though I thought it was weird as you usually use a passive monitor with a power amp. Purchased Kustom 10" powered monitor, hooked it up to monitor...


You didn't mention what brand powered mixer you have, HOWEVER MOST powered mixers also have a line level monitor and main output jacks. These are almost always 1/4 inch jacks. In any case you should be using BALANCED lines to the powered speakers using either XLR or TRS connectors on the ends. Please tell us what powered mixer you have so we can give you better answer regarding which connections to use. IF for some reason your mixer does NOT have line level outputs, you can use a high level Direct Box to condition the powered outputs to be sent to the powered speakers..
Also make sure ALL your interconnected equipment is powered by the same receptacle or source to avoid damaging due to ground bounce on utility lines and circuits. This often means running an extension cord from the stage where the powered speakers are along with a snake of the audio cables.

Dec 10, 2010 | Kustom Profile 2 PA Speaker / Mixer Stand

1 Answer

Bought a powered monitor as it said to do in the owner's manual, even though I thought it was weird as you usually use a passive monitor with a power amp. Purchased Kustom 10" powered monitor, hooked...


You haven't mentioned what model and manufacturer the mixer is. I will have to guess and say that the monitor out on the board isn't providing signal to the powered monitor or the monitor out on your board is powered and is now damaged by plugging a powered monitor into it. Carefully reread your manual and determine if the monitor out on your mixer is powered or line level. Reread also and make sure that the signal you are monitoring is assigned to monitor out, levelled correctly etc. If you find that the monitor out is passive (line level) try hooking it up to an external power amp and speaker. A guitar amp will do for testing purposes. Start with a low input volume on the amp. Also make sure that if it is passive to use a shielded cable from monitor out to input. If your board has powered monitor outs you can use a speaker cable from monitor out to speaker input (non powered monitor speaker).

Dec 10, 2010 | Kustom Profile 2 PA Speaker / Mixer Stand

1 Answer

I want a denon repair manual for avr 1000,or any manual showing block diagram of avr-1000,help me please


These are only available from Denon directly. I'm not sure if they will sell them to the public. We used to get them as a Denon service center.

What is the specific problem you are trying to resolve? Perhaps with a description we can guide you through the repair.

Dan

Apr 15, 2010 | Denon Music

1 Answer

Window display not functioning


You need to use a transformer type voltage convertor.

DO NOT use the type for converting 220 down to 120 for hair driers.

The voltage should NOT be a problem as usually these will operate down to 100 volts. If the keyboard is sounding correctely, that would indicate there is NOT a problem with voltage.

It is LIKELY that the connections to the LCD were damaged in shipping. There are many, many connections to the glass assembly and if dislodged will have lines across the display.

Repairing this is usually not something one can do unless very experience in electronics.

Mar 12, 2010 | Yamaha Dtxpress Iv Special Electronic Drum...

1 Answer

Power supply for vocalist 2 goes bad twice


Likely the supply was underated OR it is getting hit with a transient. Transients are common in some venue power systems.

There should be a label on the unit as to what the power requirements are. Make sure the power adapter is rated for that or more CURRENT in amps or milli-amps.

Are you sure the power supply has failed? There could be an intermittent in the unit, most likely with the inout power jack... They often get damaged by tripping over the power cord.

Feb 09, 2010 | DIGITECH VOCALIST LIVE 2

1 Answer

Marshall MG50 DFX makes a squealing noise on power up


Yep, chalk that one up to poor design...The amplifiers are going out of balance during power up and down. Two seconds is pretty long... Try turning down the gain during power on and see if that affects it.

The pop on turning off is normal... None of these have speaker disconnecting hardware that is necessary for very high power amps. The biggies have hardware that checks amplifier is balanced before connecting the speakers and a relay also cuts the speakers immediatley on power down. As power goes up and down the circuitry comes to equilibrium and until it does, strange things happen.

I would investigate the CONDITION of the filter caps for the main power because if they age to a higher internal resistance that COULD cause the high freq oscillation on power up... Two seconds is MUCH too long.

There should also be some non-electrolytic caps NEAR the power output transistors to handle high frequency supply power bypassing.

Check the power bypasses that service the preamp stages. Look for pregnant electrolytic caps that have failed.

Ultimately, you MAY need an oscilloscope to isolate the high freq problem.

Jan 03, 2010 | Marshall Music

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