Riso 390 User Manual page 109

When the indicator [Area *3] lights
Because the entire master roll has been consumed, set a new master roll.
p.88
When the indicator [Area *3] lights
Because the Master Disposal Box is full, remove the box and discard the ejected masters.
p.91
When the indicator [Area *3] lights
Because the Ink Cartridge becomes empty, replace with a new Ink Cartridge.
p.86
When the indicator [Area *3] lights
Check error numbers shown on the Error Number Display and contact your dealer.
When the indicator [Area *3] lights
Contact your dealer and take a periodic inspection.
Troubleshooting
Check & Error Display 107