COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) 10–3Pre-Checks Density Slope Adjustment Solid Black Density Adjustment Optimum Exposure AdjustmentClean the charging wires. Is therea difference in densitybetween front andrear?Make two to three copiesof the Test Sheet (NA-3).Make a copy.Check the height ofthe charging wire.Set the setting of ‘U12:density correction’ inuser mode to a standardsetting.Turn the adjusting screw atthe rear of the primarychanging assembly counter-clockwise and the adjustingscrew at the front clockwise(1.0 mm max. each).Turn the adjusting screw atthe rear of the primarycharging assembly clockwiseand the adjusting screw atthe front counterclockwise(1.0 mm max. each).Make a copy.Turn the adjusting screw atthe front/rear of the primarycharging assembly counterclockwise so that the primarycharging wire is closer tothe photosensitive drum.Increase the setting of‘scanning lamp ONvoltage adjustment’in service mode (326).Decrease the setting of‘scanning lamp ONvoltage adjustment’in service mode (326).Is the rearlighter?YESYESNONO Is the densityof gray scale No. 1too low (light)?YESNOMake a copy.Is the densityof gray scale No.10 optimum?Is the whitebackgroundfoggy?NO YESYES NOIs the densityof gray scale No. 10 toohigh (dark)?YESNOSee “Preventing ImageFaults.” (p. 10-32)Perform AEadjustment. (p. 10-19)*1*2 *1*2*1*21: If there still is a difference after turning the adjusting screw 1.0 mmeach*, check the charging assembly, scanning lamp, and scanner for dirt.*A full turn causes a change of 0.5 mm.2: When turning the adjusting screw clockwise, be careful that the heightof the charging wire is not less than 10.0 mm.A. Image Adjustment Basic ProcedureNon-AE, Copy Density at 5
