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Can't open downloaded manual, how? - Yamaha Music

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Look at the format the manual is in . If it is .pdf I suggest dowloading Adobe reader here:

Posted on Oct 13, 2010


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How do you replace keys

Get replaceement keys from Yamaha America (musical instruments). Search Google for the phone number in California. You will need the model number and the key position that is broken and maybe the SN of your unit.
Download a service manual for instructions here:
When you go to this site DO NOT click on the download button but wait a minute for "Get Manual" to appear in the BOTTOM RIGHT and click on that link. You will get a PDF file of your SERVICE manual that has everything you need to understand how the keys are attached. BE VERY CAREFUL when opening the unit as there are tender ribbon cables between to two halves of the case. The manual probablly has a part number for the key in the parts list.

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A friend of mine has a Casio keyboard CTK-691 which is not functioning. He asked me for help. I have another friend who is a radio repairman (professional). He has found out that the IC with position...

Here is a schematic for a CTK680... might be close to your CTK681...

Scroll down to "get manual" and click to download it. IGNORE other download links on the page.

Assuming this is the correct schematic, IC12 is shown as a TC750BF which is an open collector driver for the MIDI. If this part is bad, the MIDI output drive signal to an external device will not work. Without an external device connected, the output of this chip WILL NOT change as it is an open-collector driver and without the pull-up of the external device the output will remain at zero... so if the tech is testing this particular part AND the symptom is NOT that the MIDI signal to an external device is not working, then he is on the WRONG TRACK. Often radio repairmen do not understand logic chips and their variations.

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Fender Hot Rod Deluxe. Works great except when I turn the amp off it crackles pretty loud. It takes about 5-10 seconds for the crackle is heard. If I turn the standby switch first, then wait a minute or...

As voltages drop, electronics gets unstable as it goes down and becomes noisy... this may be the nature of this beast. Opening the standby might be the best way to avoid the problem.. Here is your schematic for service:

Scroll down to "get manual" and click to download. IGNORE other download links.
Opening the standby switch turns off power to the main amp so noise generated in the preamp will not be amplified.

Jul 25, 2011 | Fender Hot Rod Deluxe Guitar Combo...

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Hello, i spilt some smoothie on my Yamaha YPG-625s keys. The keys sound better now but i just want to properly clean the inside. How can i do this?

It is a lot of work to open and access the key contacts. Here is your service manual:

Scroll down to "get manual" and click on it to download. Ignore other download links on the page as they are for viewers and other software.

Jul 10, 2011 | Yamaha YPG-625 (YPG625) Digital Piano

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Hi, I need the pmp5000 schematic or service manual. Because my mixer smps is faulty.. (On the smps pcb following parts are problem : T12 - D24 and 25? R11 open - D6 and D9 are short - TOP221 ? ) Best...

Oh yeah... know them well The IGBT transistors fail, the sand coated resistors blow open... replace as a pair. The driver transistors get blown... 2SA1020's and 2SC2655-Y's. One or more of the gate speedup diodes for the IGBT's get blown. The switching reg chips, IR2153 is usually gone. and more...

Here is your service manual:

Scroll down to "get manual" and click to download. Ignore other "download links".

You will likely find that one of the power amps has shorted... been there, done that several times. Usually the channel A (rearmost) power amp shorts takeing out the 9140 Mosfets and other parts. Often an internal short between an interior and upper layer of the amp circuit board is the fault that causes all this. Use a light bulb (150 watt) in series with the power input when testing after repair. Use an isolation transformer when working on the supply for personal safety. When supply is running again, discharge the 70 volt source caps before plugging onto the amp to avoid welding arcs at the connectors. I have seen the supply hold charge for several days.

Jun 29, 2011 | Behringer Europower Pmp5000 Powered Mixer...

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Just bought a pair of used Beringers Truth b2031a monitors. one of which doesnt work anymore at all... opened the back of it (took those 6 screws out) and saw that the power connection has been cut of......

Here is the service manual schematics for your speakers:

Scroll doen to "get manual" and click on it to download the manual... Do not click on the other downloads at the site, they are for viewers you don't need.

Take the schematics to a COMPETENT electronic service technician to get units repaired. You obviously bought units that had been hacked before...

Jun 21, 2011 | Behringer Truth B2031a 225-watt Powered...

1 Answer

I have Korg M3 with some weighted keys issues and I need top repair it. Please advise. Thanks, Ted

Hereis your service manual for the M3... 29Mb

Scroll down the site page to "Get Manual" and click on it to download.
Be careful of the ribbon cables within the unit. God to have extra hands available when opening the unit.

May 10, 2011 | Korg M3 88 88 key Workstation/Sampler with...

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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:

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...

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Analog acoustic modeling

About the cable,

This is from

. Plus, the Generation guitars that feature ACM come with a dual-ended cable that sends the two tones to two different amplifiers, opening up even more tone possibilities.

Sep 12, 2008 | Peavey Music

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