Casio ct-650 manual - Music

No you can't as our PROPER Expert Cindy says.

Casio Ct-636 does not support any sustain pedals.Amazon.comhttps://www.amazon.com > ask > questions
A: Casio Ct-636 does not support any sustain pedals.

The other 'Contributor' probably saw this

CT-S1000V - SupportCasio https://support.casio.com > manualPDF

This Digital Keyboard does not come with a pedal unit. • You can use the PEDAL1 jack to connect an optional (SP-3, SP-20) sustain pedal. You can use the.

Link to free manual:

https://www.manualscenter.com/manuals/casio/ct625-owner-manual.html#.XufFjEVKjic

try this... Casio Casiotone CT 360 Manuals ..or this... Casio CT 360 keyboard manual Google Search

Difficult to find, but there is a seller on Ebay who has one Casio CT 647 CT 648 Digital Piano Keyboard Owner User Manual Booklet

https://dl.dropboxusercontent.com/u/7502291/keyboard-manuals/casio-ct-650_manual.pdf

http://dl.dropboxusercontent.com/u/7502291/keyboard-manuals/casio-ct-360_manual.pdf

There is no such model.
If you are referring to CT-615, you can purchase a PDF copy of manual from ebay

http://www.ebay.com.au/itm/Casio-CT615-Keyboard-Users-Owners-Manual-CTK-615-/200932122034

https://www.manualslib.com/manual/993054/Casio-Casiotone-Ct-360.html

Try this

The only places I found for the manual were pay sites.   Here is one for you to choose from.   They both were the same price.
http://www.user-manuals.com/advanced_search_result.php?keywords=casio+ct-420+manual&forward=plist

Here is the site to download the manual:http://safemanuals.com/user-guide-instructions-owner-manual/CASIO/CT-395-_E