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Problem related to the brightness of the laser emission
Error in determining the level of white in the performance of hatching
Error in determining the level of black during hatching
Error output level in the performance of hatching
Failure ASIC (MCU PWB)
Trouble copying lamps
The E7 code is related to the laser and or the distinction between black and white being read/interpreted by the system. There should be a sub code which will point more directly to the problem. The laser could be bad or the glass and mirrors need cleaning. Remove the glass (with the copier unplugged) and clean including the white strip underneath, clean mirrors too.