Casio CT 656 Hi, anyone know where I can purchase a replacement 9v input socket. Not the power supply itself, but the actual input socket which is soldered to the internal pcb. Cheers

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To rule out the power supply, or the related power supply circuitry - try it with batteries. If the problem goes away, you can try another 9v power supply with the same ma current (or higher) just make sure it is the correct polarity.

Hi, There are several common reasons why this and most similar keyboards have this problem.
If you can fit known good batteries, and it works, this confirms the problems will be with the external power supply or connection.
Usually batteries are not available, so.......
Do the obvious.

1. Is the power supply plugged into a known good mains socket?
2. is the mains socket switched on?
3. is the power supply plugged into the keyboard?
4. is the keyboard switched on?

If the power supply is not the one supplied with the keyboard, then check it is compatible.
(You do not have to buy an expensive replacement power supply, a universal, regulated one, with a selection of connectors will be fine. Supermarkets and the like sell them.)
The manual, or a label on the bottom of the keyboard will tell you the voltage, current consumption, and whether the current is AC or DC.
Invariably the current is DC.
All the Casios I have are 9 Volts, (9V) and very few are more than 300 milli amps (300mA) More milli amps is fine, so the current can be the same or greater.
A TYPICAL power supply is likely to be:-

• 9 V
• 300 mA or more
• DC

BUT DO CHECK
Important
The power supply needs to be REGULATED.

Polarity
This is the way round the connector is wired.
Usually the center is negative (-) and the barrel is positive (+)
This information is molded into the plastic or on a label next to the socket.
On a replacement (universal) power supply, there will be a set of connectors, and when you have selected the correct one, the arrow on the end of the lead should point to the correct polarity symbol on the connector.

Fault finding
The most common fault is the power connector being broken or the solder has been broken.
Slowly moving the connector round, to find it works in some positions, is a sure indication that is the fault.

Repair is quite simple, but there are a lot of screws to take out.
Ideally, drill a hole in the case, where convenient, and fit a metal connector. Now connect to the PCB, in place of the original socket, with flexible wires.
Other wise if it is just solder failure, re solder and glue the socket with epoxy resin (Araldite) or hot glue from a glue gun.
Hope this helps, Chris.

try plugging in without the bateries...Also check your adaptor as well as your ac requirements on your keyboard..It specifically calls for a Casio AD-5 Adaptor.

• 9V power supply; 850mA
• Positive sleeve/negative tip This needs to match your adaptor Good Luck

http://support.casio.com/pdf/008/ctk_720_01_e.pdf

Hi, This is a copy and paste from a similar question, please excuse my laziness........

Hi, There are several common reasons why this and most similar keyboards have this problem.
If you can fit known good batteries, and it works, this confirms the problems will be with the external power supply or connection.
Usually batteries are not available, so.......
Do the obvious.

1. Is the power supply plugged into a known good mains socket?
2. is the mains socket switched on?
3. is the power supply plugged into the keyboard?
4. is the keyboard switched on?

If the power supply is not the one supplied with the keyboard, then check it is compatible.
(You do not have to buy an expensive replacement power supply, a universal, regulated one, with a selection of connectors will be fine. Supermarkets and the like sell them.)
The manual, or a label on the bottom of the keyboard will tell you the voltage, current consumption, and whether the current is AC or DC.
Invariably the current is DC.
All the Casios I have are 9 Volts, (9V) and very few are more than 300 milli amps (300mA) More milli amps is fine, so the current can be the same or greater.
A TYPICAL power supply is likely to be:-

• 9 V
• 300 mA or more
• DC

BUT DO CHECK
Important
The power supply needs to be REGULATED.

Polarity
This is the way round the connector is wired.
Usually the center is negative (-) and the barrel is positive (+)
This information is molded into the plastic or on a label next to the socket.
On a replacement (universal) power supply, there will be a set of connectors, and when you have selected the correct one, the arrow on the end of the lead should point to the correct polarity symbol on the connector.

Fault finding
The most common fault is the power connector being broken or the solder has been broken.
Slowly moving the connector round, to find it works in some positions, is a sure indication that is the fault.

Repair is quite simple, but there are a lot of screws to take out.
Ideally, drill a hole in the case, where convenient, and fit a metal connector. Now connect to the PCB, in place of the original socket, with flexible wires.
Other wise if it is just solder failure, re solder and glue the socket with epoxy resin (Araldite) or hot glue from a glue gun.
Hope this helps, Chris.

http://www.ebay.com/itm/DC-9V-AC-Adapter-Casio-CTK-4000-CTK-558-CTK700-Keyboard-/221021599357

Some Casio Keyboards use 9V DC (center negative) others 12V DC (center negative).
If check what voltage your Keyboard use. Generic AC adapters are usually center positive. So you have to invert the wire with a new DC plug to make it center negative,
Easiest is to buy a Casio ac adapter made for your keyboard from a Casio retailer.

This service manual should be close to your unit... it is a CRK671:

http://elektrotanya.com/casio_ctk671_sm.pdf/download.html

Scroll down to "get manual" and click on it to download. IGNORE other download links.
Power input schematic is on page 10, lower right corner. They appear to "or" in the batteries with the adapter if adapter is used. Look for the diodes and also the bifilar power inout filter.

Unfortunately the adapter jacks are a bit of a weak point on many keyboards but it is quite seldom the jack socket itself that is at fault.
Often the sockets are soldered directly on to the printed circuit board and are prone to either one of the soldered legs breaking, or even the circuit board itself cracking around the jack socket. 
Whilst it is generally possible, with care, to resolder a broken leg on the socket if the actual circuit board has cracked the whole board will have to be replaced.
If the actual jack socket itself is damaged it should be possible to snip through the legs and remove it before soldering a new one on to the stumps of the old legs. this is likely to prove easier than trying to solder directly onto the circuit board, unless this is something that you are experienced at doing.

Apparently you can purchase a full service manual for the Casio WK-1200 here for a modest price but I have not used this source myself so cannot vouch for how good it might be.http://www.tradebit.com/filedetail.php/2084335-repair-manual-casio-wk-1200-electronic-keyboard

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.