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seems to me this will need more than most people can do. tracking down the problem will require a lot of testing of transistors and such... but just maybe it's nothing more than a loose ground wire on the circuit that powers that side. Good luck.
You cannot connect a Gk3 directly to an electric piano or synth. What you have to do is connect the 13 pin DIN connecting cable from the gk3 to the input on a Roland guitar synth unit like GR 20 or the GR 55 which supplies the desired instrument tones as required. The synth can be connected via 5 pin midi cable to an external synth to provide further tones...I personally have never used a keyboard to provide extra tones because I am a guitarist so only used synth modules and not keyboard ....remember also you need an amp or pa system to hear the sound output from the guitar synth module or external module.
If everything lights up and responds to button pushes like normal, and you've done a hard reset as described in the manual, check to see if you have sound out of the headphone jack. It's most likely not a user serviceable problem and will need to go to the shop, but it will probably be the output amp rather than the main board.
I could not find the schematic for this, but other Casio units use a common voltage regulator amplifier chip to drive the speaker... I would firsst check that leads to the speaker have not become disconnected.
I have two Yamaha's and I will say they are maintainable. Almost ALL the weighted piano key models use a keyboard made by one company as I understand it. I can easily get service manuals for the Yamaha, not quite as easy for the Roland... same goes for repair parts. Your decision... listen to each and decide. Hint: Use a set of headphones to do the compparision rather than internal speakers as the orientation in a music store can drastically change the sound.
I first would suspect the switches on the eadphone jack. Normally these cut off the speakers when headphones are plugged in. These jacks and the switches are really weak, poorly made, and easily broken, especially if headphone cord gets yanked.
Make sure that the level of the headphone out put is open. Make sure it is on manual adjustment and no auto level. And test your headphone on a other device to clear that your headphone is not broken. If all these options are correct you headphone pre amp of the XP 50 may be damaged or broken.
They use pre-programed chips. You will have to use the midi out feature to control another midi capable sound module or midi in to a computer and use the internal sound card.
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