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E7 00 Content ICU communication trouble (ICU detection) Detail Communication setup error, framing/parity/protocol error Cause Slave unit PWB connector improper connection Slave unit PWB – ICU PWB harness trouble Connector pin breakage of the motor PWB of the slave unit PWB Slave unit ROM trouble. no ROM, ROM reverse insertion, ROM pin breakage
The E7 can not be "turned off". This error usually indicates a bad laser unit or "shading" problems. You could try cleaning all the glass/mirror components including the white shading strip under the glass - it may help.
Probably need a new laser.
what is you OS? check you printer drivers. are they properly installed?, what is your connection between your PC to your printer?, AR 275 can be connected thru network, parallel port, and a USB... they have different printer drivers
If you have a finisher on that unit ,that code is upper limit switch problem. Check to make sure your upper tray is in the right position. Otherwise your either your tab is broken or your led is popped.