How can I get circuit diagram of Dewalt Dcb-107.fault is not charging.

You would have to contact DeWalt direct. There is nothing online. There are some repairs videos to the electronics. Perhaps your issue is the same?

https://www.google.com/search?q=%22DeWalt+DWST1-81078%22+wiring+schematic&tbm=isch&ved=2ahUKEwi-jrn8gIj3AhWYrXIEHWYHAY4Q2-cCegQIABAA&oq=%22DeWalt+DWST1-81078%22+wiring+schematic&gs_lcp=CgNpbWcQAzIHCCMQ7wMQJ1CeDVi4TWCIV2gAcAB4AIABVogB0gKSAQE0mAEAoAEBqgELZ3dzLXdpei1pbWfAAQE&sclient=img&ei=tAVSYr7kIZjbytMP5o6E8Ag&bih=937&biw=1920&rlz=1C1QJDB_enCA643CA644

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check battery. Check fuse.

Here is the manual for the charger - note on page 2 the meaning of the problem you describe - time to replace batteries (depends how old they are)
http://download.sears.com/own/00925737e.pdf

That being said, check the videos out, perhaps can get it to work after all for a while longer.

I researched this item and the battery in a photo looks the same as a Dewalt DCB 140 XR - 14.4 v. Take your battery to a battery shop and check it out or go on line to check if the Dewalt battery is a replacement for your battery. failing that there are battery shops that can re battery your unit for around 75% of the new price.;

Several sites show this is a MAP sensor Code for Mercedes.

The Dewalt charger's red light will flash while charging and go to steady red when the battery is fully charged. If you go to the Dewalt ServiceNET site at http://servicenet.dewalt.com/ you can search for the manual for any of your tools. DCK294L3 does not have a manual as that is the model number for the whole kit. Search for the model number of each of your tools and you can get the manual for them. Inside the manuals it also describes the different meanings of how the red light is flashing on your charger.

Change it and Look at eReplacementParts.com and the parts diagrams

You can contact a Dewalt Service Center to see if they have the diagram. Black and Decker is Dewalts lower priced line. A quick search on their website did not reveal anything. They may not have the diagram. As far as I know there are no parts available for the chargers so you may have a hard time locating the diagram. Try giving Dewalt a call.

Hi,I just find the circuit diagram,hopefully that could help you ! :-)