Question about Roland Boss BR-800 Digital Recorder

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Boss br8. I have no power is there a fuse inside the machine?

Replaced power supply, still no power.

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There should be a fuse on the power supply board inside the unit. If it is not that then it is most likely the board itself. You can get a replacement at Allied Electronics.

Posted on Nov 30, 2014

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1 Answer

Why are there only two dots when I power on?


1. Make sure that you have the correct power supply plugged in.
2. If you are using the BOSS power supply, it could be defective. Measure the voltage it is producing and make sure it is correct.
3. If the voltage is correct, then the problem is inside the unit, and it will need servicing.

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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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Why power cutting out on yamaha-p95


Hi, This could be for a number of reasons the most common causes are :

1) Socket where mains adaptor is plugged in becomes loose on the PCB and will need to be replaced / repaired

http://www.beckettsmusic.co.uk/shop/scripts/prodView.asp?idproduct=17018

2) The power supply unit fails and needs to be replaced. You should only use the correct power supply for your instrument.

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The system does not power on. When the power supply was opened up, the 50 V capacitor exploded. When replaced, it got very hot and eventually exploded again.


Hi,

Replace the caps and this time disconnect power supply rails that go to the amp module, then check positive rail for +30V and -30V, if they are present then your power amp ic's that if i remember correct are TDA7293 are blown, or at least one of them, let me know your results.

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check the main switching ic. might be faulty, could be heating.

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I have a Behringer zenyx 2442fx mixer. I was using it one day and all the LEDs started glowing brighter and brighter until the whole desk went dead. It has not worked since. I'm guessing the power...


That sounds bad! I haven't heard of a runaway supply for these... Testing of the power supply is in order. The LED's are all driven from the +15 volt supply which is secondary regulated by a three terminal regulator... probably a 7815. I have seen failures of this chip in another Behringer product so it may be a bad batch. The question now is if this has fried the main switching power supply.

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1 Answer

I used the wrong power supply and now it won't power up at all. Had a look inside for fuses but looks like they are part of the circuit board??


you might of fried the circuit board. if you see fuses and they look burnt out you can try n replace em but my best surruestion is to calll roland and play dumb and tell them it just stopped working chances are its under warranty and youll get a new one.

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1 Answer

Can't download tracks from BR-800 to laptop


Go to this site:

http://www.vsplanet.com/ubbthreads/

In the forums tab, scroll down to the BR8 forums. There is software to convert the BR files to PC readable. You can find discussion there of where and what to get.

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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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