Schematic for a dewalt de 9107 charger

It's going to be a zener diode, that's the easy part, you will need to know the voltage as well, only way to know that is find a good charger and measure the voltage drop across the diode with a multimeter or find a schematic.

No 'model de 0077'. All question must have FULL 'make model (what it is)'.

https://www.google.com/search?q=dewalt+model+de+0077

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Contact DeWalt directly to request the manual.

There is no schematic - the charger is a disposable accessory, no repair parts are available.

this is the only one I have found.

It is not feasible to convert it internally.

if its anything other than replacing the cord, it is not considered "repairable" and there are no schematics offered.

there was a recall on this model charger, so a dewalt service center might be able to repair or replace it free of charge.

As you know, solid red on your charger means that the battery is fully charged and the BLINKING red light means the battery is charging. Unless the light is blinking irradically everything is working the way it is supposed to. If the light is blinking irradically, the battery may just be too hot or too cold to charge ( like when you are driving many lags and your battery dies) and in this case simply wait 15 minutes to charge. If you get a fast blinking light still, the problem probably is with the battery.

I don't think that would be a problem, For schematics I would go to Dewaltservicenet.com and type in your model number usually in the center of the site and download a breakdown. Let me know if i can help more.