What size Phone Output Jack do in need for a Yamaha DGX 200?

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Here is a link to the manual. http://www2.yamaha.co.jp/manual/pdf/emi/english/port/DGX200E.pdf

Here it is in PDF format for you! Use this link:

http://www.manualowl.com/m/Yamaha/DGX-200/Manual/151764

If you have a voltmeter, you can test to make sure that your powere adapter is putting out the right voltage. (Should say on the label something like 120v IN - 12VDC output.
If it is bad or you don't have a meter to test it... You can get a replacement for less than 10 bucks on Ebay.
If the power is good, you have to move on to power button, etc.
I would call an electronics pro...

Here you go:

http://usa.yamaha.com/products/musical-instruments/keyboards/digitalpianos/dgx_series/dgx-640_color_variation/

There is a an "output phones" to put the headphones into on page 17 of the manual here.

Hope this helps!
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Here's a link to a third-party owner's manual
https://www.manualslib.com/manual/539184/Yamaha-Portable-Grand-Dgx-205.html

yes - use two RCA cables from the left and right audio output and connect it to the aux audio RCA inputs of an amplifier or receiver.

The control panel hinges upwards and you have to move the keybed back a bit to get at the jack. All the screws on the bottom for the keybed. I'm not sure where the ones for the control panel are.

From Yamaha DGX 200 Manual

• Q-There is no sound even when the keyboard is played or when a song is being played back.
• A-Check that nothing is connected to the PHONES/OUTPUT jack on the rear panel. When a set of headphones is plugged into this jack, no sound is output. Check the Local Control on/off. (See page 69.)