Question about Korg PS60 61-Key Performance Synthesizer

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What screws need to be removed to get inside the keyboard to replace power supply input jack

There is a short, got a new power supply, but I believe it to be the input jack.

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Flip the keyboard on its back and remove all screws with an arrow.

If no arrow, remove all on outside edge.

The jack should be easy to replace but you may need a soldering gun.

Posted on May 07, 2014

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My Casio ctk 811ex wont power up anyone more.Is there an internal battery that needs replacing ? What could be causing the problem ? 2 weeks ago it was working fine


ALWAYS start with the "easy" things 1st. Is the AC outlet on the wall working properly? Is the "wall-wart" power supply working correctly? If no defect is found, check the DC power jack located on the rear of the keyboard. Does it seem to be loose or does moving the power supply jack up/down cause any change? New wall-wart power supplies can be purchased from Radio Shack and usually at a lower price than the original factory replacements.

Mar 29, 2015 | Casio Music

1 Answer

Power switch for Casio key board not switching


Without knowing the model, age of the keyboard if it is moved a lot, etc it's hard to say. Most common problems are damaged power jack(or cracked trace on the supply board near the jack ), bad AC adapter, bad power supply board(shorted semiconductor, regulator, etc ) and rarely a bad power switch. You could try a new ac adapter but it might be a waste of money(if you have access to a multimeter check the output of the adapter before buying a new one).

Jan 02, 2015 | Music

1 Answer

After using two applicable power chords the keyboard will not turn on


Assuming that the adapters are 12v negative(-) center and an incorrect positive(+) center was never used. That would cause a shorted diode in the power supply. The next most common problem would be a cracked trace or solder joint inside the keyboard at the power jack. Other problems require more detailed troubleshooting. A wire soldered across the cracked trace(if that is the cause of the trouble) is relatively easy if you own a soldering iron. If not bring the keyboard to a technician.

Oct 11, 2014 | Casio Cdp-100 88 Note Digital Piano

1 Answer

Yamaha CP 300 broken headphone jack


Some keyboards use the amp output sockets for headphone use.
You might need some adapters for your headphones.
If it fell in, you would see an empty hole. This would be unlikely because it is held on by two screws. If all fails, buy an amp with a headphone jack input. Plug the keyboard into the amp and use the amps jack.

Dec 15, 2011 | Yamaha CP300 Stage Digital Piano...

1 Answer

Input has shorted. Cant figure out how to take this amp apart.


There are USUALLY 4 screws in dress washers on the top... AND hidden are two for the handle that also grab the amp. Sometimes there are caps over the ends of the handle thaat have to be snapped off... they can be a pain to get off. I believe the amp portion slides out the back... Thhere is twwo wires under the amp that go through a hole to go to the speaker... be careful they are short and they MAY have a ferrite donut around them... It is usually a fight to get them free and even worse when reassemblling to get them back on... AND they put hot melt glue on the connector in the amp... You have to carefully release that...I have a BX1200 and have had it apart once for repair... Input shorted? You mean the input power or the input audio jack... if the latter, let me guess... somebody tripped over the guitar cable... happens all the time... that is why we loop the cable through the handle to avoid breaking the inout connectors.
I am not sure how you analyzed the input audio connector is shorted... these jacks are JUNK and easily broken. If the input POWER is shorted, or appears to be shorted, it may be deeper than the power supply... USUALLY one of the amp chips is shorted.

Here is the service manual for the BX1200 which should be similar... they may have paralleled another LM3886 to get the 180 watts.

http://elektrotanya.com/behringer_bx1200_sch.zip/download.html

Scroll down to the "Get Manual" link and click on it to download.

Apr 20, 2011 | Behringer Ultrabass Bxl1800 180w 1x12 Bass...

1 Answer

My marshall mg100 combo took a spill now the front of the input jack came off and the jack itself fell back inside the amp. I don't want to just start unscrewing stuff. whats the proper procedure to get...


Yep! These poor quality jacks become "unriveted" and break in half. This is a fairly common occurence. Don't be afraid to unscrew stuff. USUALLY the corner protector screws are NOT necessary to take out. OFTEN the screws for the handle need to come out and any other screws from the top and the sides in the vicinity of the amp portion need to come out. Just keep track of where they go. The jack MAY be a part of the circuit board and you will need to get an exact replacement. NOTE: If it is mounted on the circuit board do NOT overtighten the panel nut as that can "de-rivet" the brand new jack !!! They are really poorly made...

Apr 06, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Okay i need to know how to get inside my amp to tighten up my input jack cause i cant play at all on my amp cause i cant get inside it i took off all the screws in the back and trying to get it off is a...


One can overtighten the input jack and "un-rivet" the jack. They are not made very well !!! OFTEN when they appear loose, they HAVE un-riveted the threaded sleeve from the metal inside the jack... that USUALLY requires REPLACEMENT of the jack itself.

The cabinet backs on a lot of these have to be PRIED out as the Tolex covering often makes them tight.

The amp portion is often retained by screws from the top and or sides AND even the two holding the handle on... there are many different configurations. Sometimes the amp comes out the front, sometimes the back. It is easy to shear off the speaker wires when removing some of them.

Dec 18, 2010 | Marshall 15 Watt Guitar Amp

6 Answers

I need to install a standard 1/4 phone jack in series with the 2 headphone jacks that are on the left front of my Yamaha P 70 electronic piano. Where can I get a schematic diagram, and a disassembly or...


What you are requesting will not work as you expect. The easiest way to achieve what you seek is to utilize what is called a Direct Box. This is essentially an external transformer that isolates the keyboard from any attached equipment (to eliminate grounding hum) and will allow you to conenct an XLR (low impedance) cable to the keyboard. I assume that you wish to attach the keyboard to some type of sound system which is likely to have standard XLR Mic inputs.

Update this with any additional questions that you have. Please note that using the direct box (about $20-$40) will be both the easiest solution as well as prevent the need to modify the keyboard.

Dan

Oct 18, 2010 | Yamaha Full-Size Keyboard

1 Answer

Loud crack when turning unit on, blows main fuse no lights come on.. bottom of power supply black and signs of burn...


DO NOT REPLACE THE FUSE !!! You will do more damage.

I just repaired one of these. A small ceramic surface mounted cap very near where the +/- 85 volt connectors plug onto the board blew up.

This left a sputtered mess on the insulating material at the right rear corner of the power supply.

The net parts list of parts I had to replace:

1. Main IGBT transistors on heat sinks. You have to remove the heat sinks to get at the mounting screws. 1MBK50D or equivalent. I used DigKey part APT28GA60BD15

2. One 1N4148 surface mount diode that is for gate drive speedup. D24 and D25. (don't remember which one was shorted)

3. All four driver transistors for the gate of the IGBT's. @ each 2SA1020 (PNP) and 2SC2655 (NPN). These are tall TO92-like transistors and I believe that at least one of these I had to get from Mouser.

4. Transistor T9, suface mount BC856B (PNP)

5. Replaced all four surface mount caps, one had exploded.
C50, C51,C54,C56. Replace with 0.01mfd/200 Volt 1206 style surface mount caps Digikey 478-1511-6

6.Replaced ceramic wire wound 10 Watt stand up resistors that were blown open. Replaced with 20 ohm design change. These slowly charge the main input filter caps and when supply is stable, a relay shorts them out. If you have replaced the fuse, you LIKELY blew them out. Original value was 10 ohms on some units. This was a Mouser part. 280-PRM10-20-RC

7. The 2153 switching reg chip IC1. This chip shorts. It is made by International Rectifier and I believe the full number is something like IRF2153. I had these in stock and not sure of which source I had procured them from... It was from one or the other.

Lots of destruction and one really needs a desoldering station to work this. Removal of the blown IGBT's is especially tough. All solder must be removed from the transistor leads AND the thermistor on one of the heat sinks. Once you have verified the leads are loose, one has to rock the heat sinks to get the tabs free. The tabs are NOT soldered! Be careful when restoring to get the thermistor leads started in their holes.

Note: ALL these repair parts were procured from DigiKey.com and Mouser.com. Neither of these places had all, I had to order from both. Mouser had the ceramic resistors.

When restarting this, leave outputs disconnected until it is running again. USE a series 75 watt light bulb in the 120 volt input. ONLY work on the unit using an isolation transformer as a large portion of this is connected right to the power line.

There is a small 15 volt switching supply that comes on first that runs the relay to short out the inrush limiting resistors. With the 2153 shorted as usual, this auxilary supply can't reach voltage enough to turn on the relay. The power for this is supplied through the ceramic resistors.

May 08, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

Power input needle snapped on Casio CTK 1000


The answer is repair shop if you don't have tools or experience with soldering. If you do it is simple to take it apart and take the old supply jack out. Take it to an electronic parts supplier so they can match a new one up for you. Make sure that the holes in the circuit board are clean and free of broken pins. Make sure that the traces leading to the holes are intact. Do not use too much heat or they will separate from the board. It might help to take the adapter with you as the jacks and plug have to match in size.

Aug 04, 2009 | Music

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