Brother International HL-3400CN Service Manual - Page 155

HL-3400CN SERVICE MANUAL 41 BD CHECK Laser beam position and laser power can be checked. Procedure Description of Procedures 1) Press the Continue button after selecting screen (a) "BD CHECK". (a) -> (b) a) 2) The scanner motor scans the laser beam as it is rotating. If the scanning position of the laser beam is normal, "GOOD" is displayed on the LCD, otherwise "FAIL". (b) or (c) b) Scanner motor automatically stops rotating after 60 seconds. (d) LCD Message 39 FACTORY MODE , r I,,> BD CHECK 41 BD CHECK GOOD 3) Press the Font button to exit the BD CHECK mode. (b) -> (d) c) 41 BD CHECK FAIL 39 FACTORY MODE d) > DP CHECK 42 FU CHECK Availability of oil in the fusing unit can be checked. Procedure Description of Procedures 1) Press the Continue button after selecting screen (a) "FU CHECK". (a) a) 2) The fusing unit starts the heat-up process, and checks the availability of fuser oil. If oil is available in the fusing unit, "GOOD" is displayed in the LCD, otherwise, "FAIL". b) (b) LCD Message 39 FACTORY MODE I,? FU CHECK 43 FU CHECK OIL:GOOD 3) Press the Font button to exit the FU CHECK mode. (c) d) 39 FACTORY MODE > DP CHECK 5-33