Oce 3121, Technical & Service Manual

Page: 861 / 908

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ed.1 SDS Description 49
*4* FUNCTION 06 600PWM Density Auto Correction
■
You must execute this mode in combination with PD density auto correction
and 200PWM density auto correction.
Note: A, B, and D are approximate values so that optimum images may still be
obtained even if the values are outside the range; you may omit “temporary
remedy” as long as the images are optimum.
Item Description Remarks
600PWM density
auto correction 1) Start ‘600PWM PRINT’.
■
A 15-gradation test pattern will be generated.
2)Place a pile of 5 white sheets on the glass platen.
Then, start ‘WHITE MEASURE’.
■
The scanner makes a single scan.
3)Place the 15-gradation test sheet on the glass
platen. Then, start ‘DENSITY MEASURE’
.
4)Check the values under A, B, and D:
20 <= A <= 60
-70 <= B <= 20
0 <= D <= 8
5)If the values are as indicated, press ‘DATA
SET’ to highlight, and press the OK key.
A, B or D not OK:
suspect:
■
drum unit
■
scanning lamp
■
laser unit
■
composite pow-
er supply
■
analog proces-
sor PBA
■
image processor
PBA
See note