To replace the dum you need to:

1. Unscrew the hex screw in the rotor (the black rotating disk with hoppers, in the middle of the drum)
2. Lift the disk from the bottom (push it up through the hexagonal holes in the metal base of the drum). Watch the drum-rotor bearing that may fall down while lifting the rotor. 
3. Unscrew the 4 hex screws now visible at the bottom of the drum.
4. Replace the drum with a new one (fit it in the same position as the one you just removed) and screw it back in place with the 4 hex screws.
5. Place the bearing in the center of the new drum's bottom.
6. Fit the rotor back in place (rotate it until fits - it has 2 positions that will work, both are ok) and screw it back with the screw you removed in step 1.
7. Enjoy your Robocoin! 

In some cases, applying a small amount of lubrication can improve the smooth movement of coins as they exit the hopper and travel through the track, particularly in the sorter area.

Lubrication is typically not required for larger, heavier coins (such as quarters), but it may be helpful—or occasionally necessary—for very light coins, especially dirty or worn pennies.

Only plastic-safe lubricants should be used. Lubricants designed for plastic mechanisms (for example, those commonly used for Rubik’s cubes) are recommended.
Please refer to the table below for guidance on which lubricants are safe for ABS plastic and which should be avoided.

Important guidelines

1. Do not spray lubricant directly onto the machine.

Apply a small amount to a cloth first, then gently wipe the indicated areas (see picture below). Direct spraying may cause damage or contamination

2. Avoid the camera tower area entirely.

Lubricant must never be applied near the camera towers. Any lubricant reaching the camera lenses is extremely difficult to remove and may permanently affect image quality

3. Use the minimum amount required.

Apply only a very thin layer and wipe thoroughly. Robocoin requires only a slight reduction in friction—excess lubricant can attract dirt and worsen performance.


Some plastic-friendly lubrication sprays:
https://www.amazon.com/DuPont-Non-Stick-Dry-Film-Lubricant-14-Ounce/dp/B00D3G6IFE
https://www.amazon.com/CRC-Industrial-Performance-Lubricant-weight/dp/B000P1E7ZS

*** Version 3.0.80 June 2, 2025 ***

• added the list of coins scanned in the current session
• added possibility of convenient scanning a single coin
• drastically decreased time of waiting for the weight to load the new coin
• made preparations for the upcoming HDR mode (not yet released)
• many other minor fixes and improvements
  

The update will be applied to all Robocoin Athena 3 machines automatically.

The USB-C cable shipped with Robocoin is meant to power up Robocoin.

Please attach one side to the supplied USB-C charger and on the other side - in the USB-C port below the on-off button.

Note: the power cable may be different color than black.

The Barcode Scanner (available in some Robocoin versions) is a wireless, battery-powered device and requires charging only when indicated. It can be charged with most of USB-C chargers, icnluding the Robocoin charger.