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Go to Service mode (Function _ Install _ 2nd Screen i.e. 2/4 make img reg 0 Restart machine Again Go to intall press init c aftrer complition press sinitc aftre getting it ready again make img reg to "1"
E840 codes reference problems with the Fuser Unit or Fuser Unit Drive.
Does paper deck R1 have heavier stock loaded in it? Found reference for subcode 0002 stating failure of HP sensors 1 & 2 in the Fuser Unit.
(external heat roller home position sensors) Part number FH7-7306-000 same for both sensors.