Question about Yamaha Music

1 Answer

Loose AC connection to electronic piano

I have a cheap synthesizer (Kwai MS710) whose AC connector has come a bit loose. When I jiggle the adapter plug up and down I can often get power to the device (but that's obviously not a long term solution). When I opened up the box I can't see any obvious broken connection under the connector's plastic housing but, again, jiggling it does get results. Any ideas how to go about repairing it? I've never soldered anything before, but I'm certainly game to give it a try.

Posted by on

  • dbclin Feb 06, 2009

    Hi,
    Thanks for your reply.
    The cable is definitely not the problem as we've tried more than one adapter with the same results.
    Your suggestion about redoing the soldering does make a lot of sense. Where would those soldering points be, though? Should I just solder away blindly under the plastic connector casing? Is it possible to pull the whole casing off of the circuit board?
    I've attached a photo of the device with the AC connector circled.
    I appreciate your help!
    David


  • dbclin Feb 06, 2009

    Aha. That's what I needed to know.
    Thanks a million.


×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

Your problem is most likely a broken cable in your ac cable. Try to replace the cord first (a place like Radio Shack will have replacements). If it's not the cable, then you might have a broken soldering point inside your keyboard. It might be too small of a crack to see, but redoing the soldering points should work.

Posted on Feb 06, 2009

  • weissmueller Feb 06, 2009

    You have to take the entire circuit board off, the soldering points are underneath. Do not try to pry the connector housing off, it will break. There should be screws holding the board. Be careful to detach all the little wire connectors and re-connect everything properly when you're done. Try not to touch anything on the board and hold it by the edges only.



×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My CTK 720 isn't powering on from the adapter anymore but battery power is working. I bought a new adapter but it still isn't powering on. Can this be repaired?


This could be a loose plug inside the unit or it could be a circuit that is bad. If the plug failed it is from physical damage from something like tripping over it or heavy use. That can be repaired by replacing the plug. If it is something like a component in the unit on a board then it becomes a little more involved.

Mar 26, 2016 | Casio CTK-720 Electronic Keyboard with...

1 Answer

Ac adapter polarity


AC adapters usually have the polarity marked on the case. What you need to know is whether the tip or sleeve is positive as required by your synthesizer

May 14, 2013 | Korg Dynamic Percussion Synthesizer...

1 Answer

It has no power..... my 9v. adapter was no problem ...


Common problem is the power input jack breaks away from the circuit board or the board cracks in the vicinity of the jack Open and inspect the area where power jack solders to the board.

May 07, 2011 | Behringer BSY600 Bass Synthesizer Ultimate...

1 Answer

Place where the ac adapter goes in that piece is loose.the keyboard dosent stay on unless sometimes i find a good position tomove the piece.the problem is internal(not the plug).


Likely the soldering of the connector to the circuit board has come loose. Take it to a shop or repair the unit yourself if electronically competent... the cost will be minimal... there are a lot of screws to take out to access the connector... be careful of the ribbon cables and connectors when opening.

Here is your service manual:

http://elektrotanya.com/korg_pa50_sm.rar/download.html

Scroll down to the link on the page "Get Manual" click on it to download.(nearly 18Mb pdf file, 27 compressed pages)
You will find the power jack on the PA-14.pnd drawing as "DJ1" It has three soldered connections.

Apr 22, 2011 | Korg PA50 61 Key Professional Arranger...

1 Answer

I have an allen and heath Xone 22 Mixer. Its great, except due to the lack of a power switch I pulled the ac adapter/power cord out too many times and now it has a really bad, loose connection. It works,...


Usually the connector that is board mounted is the problem. I would OPEN the unit as there may just be broken solder at the connector inside. If the connector requires replacement, find one at Digikey.com by searching for "power connector coaxial".

Hint: In the future install one of those little lamp switches that are in a little plastic box with knurled knob sticking out the sides. ONLY break ONE wire from the adapter to avoid getting the connections reversed. Since the wires are smaller than lamp cord, tack solder the wires to the piercing points of the switch .

Apr 11, 2011 | Allen & Heath Xone-22 2 Channel Dj Mixer

1 Answer

My power conditioner will not power my cry baby, unless i apply pressure to the 9v adapter on the wah.


If you mean applying pressure to the power connector on the pedal, a COMMON problem is that the soldering of the connector inside has broken loose or there is a crack in the circuit board inside. Open pedal and inspect for these problems.

Mar 20, 2011 | Dunlop Crybaby 9v Ac Adapter W/5.5mm Tip...

1 Answer

I have no cable for my Roland E-86. Witch one sould i buy??? tank you.


If you mean power adapter, it is a 12 volt 2 amp one and I don't know which polarity.
Here is an Ebay seller that has them for the E86:

http://cgi.ebay.com/AC-power-adapter-4-Roland-E-86-E86-Keyboard-Synthesizer-/110432738764?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item19b64dddcc

If it is the audio cable you are after, just get a standard INSTRUMENT cable (not speaker cable) with 1/4 inch plugs.

May 30, 2010 | Music

2 Answers

My Zoom H4 will no longer run with batteries. If I use AC adaptor it works fine but I get nothing on battery power


Probably the connector where you plug the AC adapter into has a switch contact that disconnects the battery when external adapter is used and it has gotten bent so when the adapter is not plugged in, it no longer makes contact to the battery power. This is pretty common for devices that use both battery and adapters.

Aug 23, 2009 | Zoom H4 Handy Recorder

Not finding what you are looking for?
Music Logo

Related Topics:

363 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Music Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Matthew Spark
Matthew Spark

Level 3 Expert

1066 Answers

Mike

Level 3 Expert

4332 Answers

Are you a Yamaha Music Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...