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I'm looking for the schematics of a Roland PA250 powered mixer. Or a site where I can download it. Thanks. Jean-Marc Belgium.

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Would probably pay to get in touch with Roland themselves, thats probably all a service techo would do, but keep surfing the net and goolgling the model #, there would be one out there somewhere

Posted on May 31, 2010

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You should ask Roland Service. Here is the link-

https://www.roland.com/us/company/contact_us/

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Thank you but i do have the manual .i need the schematics for the xr 8600, or the site to download from


Internal fuse. Or fuse near the speaker connections.

Remove power. Remove back cover look for
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125V 5x20mm Fast-Acting Glass Fuse

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Where can i get servicemanuals for Roland PA250 Powermixer?


http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CDoQFjAB&url=http%3A%2F%2Fmedia.rolandus.com%2Fmanuals%2FPA-250_250C_OM.pdf&ei=LApBUfGiG4jD4AP7tIBQ&usg=AFQjCNG3-7TgZp_JHVU76xsD6_MBTRNNDA

Mar 10, 2013 | Music

1 Answer

Using Boss FV 50H between output of Tascam M-216 mixer and church PA (line input of main mixer) with microphones on 1 channel and guitars on other. Problem:Quite a loud "pop" or...


The problem is you have an ILLEGAL connection based on proper electronic design. This pedal has UNBALANCED high impedance interconnects and the output of your mixer and the PA SHOULD be BALANCED low impedance interconnects. This makes the system subject to noise and you may even get static discharge noise. Also verify that the TASCAM and the PA system are ALL powered from the SAME receptacle or power conditioning module. This is a tough design problem to achieve what you want. Essentially you want to make the master gain of the TASCAM on a foot pedal as I understand it. There is one pedal that CLAIMS to have balanced in and out and if I had the schematic I could verify it... but I could not find the schematic in my searches... look at: http://www.sweetwater.com/store/detail/StealthPedal
This one MIGHT do the job right. You MUST use TRS BALANCED cables, NOT TS, from the mixer to this and from this to the PA. Do research on BALANCED and UNBALANCED and TRS and TS and also XLR cables using google to understand the difference and importance of using balanced interconnections in your system. I would try to get one of these pedals on approval with the correct cables and test it.

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Hi, My Roland Fantom G6 keyboard has an accident and the analog output is dead. I ask you if it is a possibility to find the entire Jack Board for replacement. It is named: FANTOM-G6 JACK BOARD ASSY...


Does the headphone jack work? Replacing a whole board would be expensive and the problem could be elsewhere. What was the accident? If large signals were driven back into the audio out lines, probably the output driver chip is fried... They likely use a common 8 pin dual op amp as the driver and the part costs 50 cents. It takes a little care to replace it as it is likely surface mounted. I am looking at the audio/jack board for a G-600 and there are a pair of transistors for some testing they do that could also be fried and might be the whole problem if the G-6 uses same or similar circuitry. The Fantom X6 uses very similar circuitry... Download service manual here:

http://elektrotanya.com/roland_fantom-x6.pdf/download.html

Scroll down to "get manual" and click to download. IGNORE other download links. On page 57 of 66 you will find the audio drivers at the right. They use little dual op amps M5218APF which probably are available someplace, however probably 4568's would work fine and are readily available. If you drove high voltage into the audio outs, I suspect first that the RF bypass caps such as C203 on the above schematic shorted. Simple to replace... pennies apiece... The test path transistors such as Q37 may also be shorted... Next would be IC18... While this circuit may not be the exact one for the G6 it probably is CLOSE as the several Rolands all seem to use similar circuitry. Regarding system SAFETY... Make sure ALL and I do mean ALL equipment interconnected including mixers, powered speakers, keyboards, etc. are powered from the SAME receptacle or power conditioning module to avoid accidents. Also for keyboards sent to mixers, USE DI boxes please! These protect against ground loops and these accidents.

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1 Answer

How do i connect it? does it need a sound card to be connected? thanks..


The Roland DR-80C Microphone is an condenser microphone which requires phantom power or a 12V power supply.. Usually this is supplied by connecting the mic to a microphone preamp or an audio mixer that has an 12v mic/line input.

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I've owned a Roland AC-90 acoustic guitar amp for 8 months and am having problems with the XLR mic preamp. There is some very low-level output with the volume fully advanced, and with an external...


I don't have the exact schematic... however sometimes they have RF bypass capacitors to ground on the balanced input lines and one side gets shorted. The schematic I do have is for an AC100. It shows a rather unconventional input circuit. You can download it here and it MIGHT be close to your unit:

http://elektrotanya.com/roland_ac-100ut.pdf/download.html

I note that this unit does NOT have Phantom power so you CANNOT use a condenser type mic with it unless you use a preamp with Phantom power... Maybe that is the problem?

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1 Answer

Need assistance in getting details of part number for power mixer


I tried to post a possible solution and it may have not made it so I will try again.

Download the data sheet for an LM3886.

This chip is used in a lot of linear audio amps in the 50 Watt range.

Download the data sheet and then check if connections on your unit make sense.

Smaller units sometimes use the TDA2050 7 lead TO220 style chip so look at that one in the LM3886 isn't the one.

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2 Answers

Mixer makes crackling noise while still on stand-by also volume increases involuntarily 35%


We here at proline music are Yahama dealers. It sounds like you could have a few different problems. Your head should go in for service. You can call us at 215-736-8055 if you have any more questions

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