Brother International HL-3400CN Service Manual - Page 163
FACTORY, No.=<123456789>, <432101234
UPC - 012502526223
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HL-3400CN SERVICE MANUAL 45-5 FBV TUNE UP This mode should be used when image defects attributed to the transfer drum need to be improved. Adjustment is to adjust the drum cleaner 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 FBV TUNE UP Code 6, press the Continue button. (b) -> (c) b) 3) The adjustment value can be adjusted in 8 steps between -4 and +4. After selecting a given number, press the Continue button. (c) c) 4) Press the Font button to finish the adjustment work for FBV. (c) -> (d) d) LCD Message 39 FACTORY MODE > NVM TUNE UP 45 NVM TUNE UP No.= 45 FBV TUNE UP - + 45 NVM TUNE UP No.=