CASIO CTK731 Repair

[Ratan]

Friends,
I am new here. Have been playing my trusted CTK-731 since last 25 years. But one day, it does not switch on. On checking at local Yamaha Service Center nearby, I was told that Power Supply IC has gone bad and it is not available.
My question to you my friends is that can I get spare power supply board from anywhere in the world for this model? I will buy it. Can you give me link or address? I know some Electronics and can try to repair it myself with your help.
Please help.

 

[happyrat1]

First of all it's a Casio, not a Yamaha.

Why are you contacting Yamaha about a competitor's product?

Amazon.com : casio ctk-731 power supply

 

[Ratan]

First of all it's a Casio, not a Yamaha.

Why are you contacting Yamaha about a competitor's product?

Amazon.com : casio ctk-731 power supply

The centre was very near to my home and the person was well known to me.

 

[jmemcse]

Looks like they may have been referencing this chip https://m.aliexpress.us/item/2255799929587456.html?gatewayAdapt=glo2usa4itemAdapt&_randl_shipto=US

The chip is a BA 9700A

Here is a link to the schematic https://elektrotanya.com/casio_ctk-731_sm.pdf/download.html#dl

 

[Ratan]

Looks like they may have been referencing this chip https://m.aliexpress.us/item/2255799929587456.html?gatewayAdapt=glo2usa4itemAdapt&_randl_shipto=US

The chip is a BA 9700A

Here is a link to the schematic https://elektrotanya.com/casio_ctk-731_sm.pdf/download.html#dl

Thank you dear friend. I will revert the result.

 

[Ratan]

Thank you dear friend. I will revert the result.

I would prefer if I get whole Power Supply Board (complete) so that I can change it myself..

 

[jmemcse]

I think you may need sub board MA2M. It should be printed on it. If so, yes they are out of stock and discontinued every where I check.

BTW, I've had a CTK-900 for years, that is very dear to me, so I understand your desire to repair.

That MA2M sub board was used in a lot of Casio CTK models. Find a cheap working CTK-550, for example - it uses that same board, swap them out.

If you haven't already, open it up and identify what sub board it has. Post a pic if you want.

 

[Ratan]

I think you may need sub board MA2M. It should be printed on it. If so, yes they are out of stock and discontinued every where I check.

BTW, I've had a CTK-900 for years, that is very dear to me, so I understand your desire to repair.

That MA2M sub board was used in a lot of Casio CTK models. Find a cheap working CTK-550, for example - it uses that same board, swap them out.

If you haven't already, open it up and identify what sub board it has. Post a pic if you want.

Thank you dear. I will open it and post details.

 

[Ratan]

Thank you dear. I will open it and post details.

Yes dear friend,
I have opened the Keyboard and taken Snaps. The Board No. is KDM464 MA2M A. I am trying at Local Service Center of Casio Co.. If you know some link, please update me. Thanks..

 

[Ratan]

Yes dear friend,
I have opened the Keyboard and taken Snaps. The Board No. is KDM464 MA2M A. I am trying at Local Service Center of Casio Co.. If you know some link, please update me. Thanks..