Brother International HL-3400CN Service Manual - Page 161

HL-3400CN SERVICE MANUAL 45-3 DBV TUNE UP This mode shall be used when the image optical density needs to be adjusted. Adjustment of the developer bias voltage against the reference value 0 (zero) in the range -4 and +4. NOTE: Do not perform this mode frequently. Description of Procedures 1) Press the Continue button after selecting Screen (a) "NVM TUNE UP". (b) (a) -> a) 2) After selecting DBV TUNE UP Code 3, press the Continue button. (b) -> (c) b) 3) After selecting the color to be adjusted, press the Continue button. (Ex. Magenta). (c) -> (d) c) 4) The adjustment value can be adjusted in 8 steps between -4 and +4. After selecting a given number, press the Continue button. (d) d) 5) Press the Font button to finish the adjustment work for Magenta. (d) -> (e) Repeat steps 3 to 5 for each color. e) 6) Press the Font button to finish the DBV adjustment work. (e) -> (f) LCD Message 39 FACTORY MODE > NVM TUNE UP 45 NVM TUNE UP No.= 45 DBV TUNE UP > Y/M/C/K 45 MAGENTA [ ] -+ 45 DBV TUNE UP > Y/M/C/K 45 NVM TUNE UP No.=