If the print density on the receipt is too weak you can try one or more of the following solutions:
Check if the power cable is in
The print is very weak if the power on the printer is low.
Decreasing the speed of the printing to a lower level
This is done by pressing:
1. Select MENU
2. Select MANAGE DEVICE
3. Select SETTINGS
4. Select GENERAL SETTINGS
5. Select PRINT SPEED
6. Then pick level 1
Increasing the print density
This is done by pressing:
1. Select MENU
2. MANAGE DEVICE
3. Select SETTINGS
4. Select GENERAL SETTINGS
5. Select PRINT DENSITY and then set the level to level 13 for Power and Battery.