Trouble shooting a makita dc18rc charger dose not turn on

It sounds like there may be an issue with the charging circuitry on your Makita DC18RC charger. Unfortunately, without a schematic, it can be difficult to diagnose the problem. However, here are a few things you could try: Clean the battery contacts: Sometimes, a buildup of dirt or debris on the battery contacts can prevent the charger from properly detecting the battery. Try cleaning the contacts on both the battery and the charger with a clean, dry cloth. Check the power source: Make sure the charger is plugged into a working outlet and that there are no issues with the power source. Check the thermal sensor: The Makita DC18RC charger is equipped with a thermal sensor that prevents the battery from charging if it gets too hot. If the battery is too hot, let it cool down before trying to charge it again. Try a different charging mode: The Makita DC18RC charger has two charging modes - rapid and maintenance. Try switching to the other mode and see if that makes a difference. Check for loose connections: Inspect the charger and battery for any loose connections or damaged wires. If you find any, try repairing or replacing them. If none of these steps resolve the issue, you may need to take the charger to a professional repair shop or contact Makita customer service for further assistance.

The Makita DC18RC charger is equipped with a diode labeled D14 that helps regulate the voltage. It is a 1N4007 diode, which is a 1-Amp, 1000-Volt diode. You can find the electrical schematic for the DC18RC charger online with a quick search.

Yes, because the voltage and amperage input to the charger is constant, so the board management dumps excess charge once the battery is fully charged. The battery cools, but the charger warms up. Mine does the same. It is a 15 minute charger, so the current is high.

Makita DC18RC 18V Lithium-Ion Rapid Optimum Charger

https://www.amazon.ca > Makita-DC18RC-Lithium-Ion...
Industry leading charge times of 15 min. · During the charging process, the Rapid Optimum Charger monitors actively controls the current, voltage and temperature ...
Battery Cell Type: ‎Lithium Ion
Style: ‎Plug
Batteries Included?: ‎No
Power Source: ‎Ac

R91 is 2R4 ohm

Most chargers have a specific sequence of flashes to indicate whether it is chargers or there is a problem. If mine flashes real fast the battery is usually too hot to charge. You did not say what brand or model you have. The best way to determine if its a bad battery or bad charger is to try charging a known good battery. Usually it is the battery but occasionally the charger can be the culprit.

The DC18RC are most likely to charged the BL1830 battery, which is the most popular of 18V Makita power tools. It is a Li-ion battery.

And the DC18RC battery charger has two volt 110 Volt and 240 Volt.

The 240 Volt DC18RC charger can replace model DC18RA & DC18SD because of its improved performance and full compatibility with Makita's NEW 'Star' labelled batteries that communicate between the tool, battery & charger. And, it is a fast charger.

It can charge a Makita BL1830 Battery in approx 22 minutes.

But, I do not recommend to convert a makita charger model DC18RC at 110 volt to 240 volts.

The reason is as below:

1. This will void product warranty ! If you follow this mod, you do it on your own risk !

2. There are several comments that described
same model # but with different design and components.
Please beware that this mod might not work on your charger
or worst, will damage it.
Only perform this mod if you know your way around with electronics !

Did Someone Succeeded to Change the DC18RC from 110v to 220v ??
What are the component that should be replaced ??
Where can i get them ?
Thx ,
Lio

If both red and green lights are flashing after you put the battery on the charger, the charger is reading the battery as bad or defective and it will not charge the battery. It may be because there is a short in the battery, one of the cells is bad or the battery is just old and won't charge anymore.

I had the exact same problem. I ordered the ZNR V10 241U part from Dija Key. They are around 36 cents if you buy 10 of them. I cut the old one out and soldered the new one in. I changed the fuse over to an automotive one so the fuse is easier to obtain. I plugged it in and charger works fine.
What happens is a voltage spike either low or high gets recieved by the charger. The fuse appears to be slow blowing and does not stop the spike in time. The spike is stopped by the varactor surge supresser. In doing so, it saves the circuit board so all you have to replace is the fuse and the surge surprsser.