Panasonic UF-490 Service Manual page 149

5.1.5.3. Shading Adjust
This Service Mode is used to adjust shading of the CIS Scanner, when the CIS Unit is replaced or the
Scanning Image is dirty.
Step
1 Standby
2 Press "FUNCTION" and then "7".
3 Press "MONITOR" four times, then press "*".
4 Press "5".
5 Press "6" or
use "V" or "/\ " to select the Adjust Shading mode.
6 Set the White 10 inches (254 mm) wide blank original
in the ADF.
7 Press "START".
8 The original feed into the scanner and exit out when
the adjustment is completed.
9 Press "STOP" twice to return to standby.
Service Mode 5
Operation or Unit Condition
149
LCD Display
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SET MODE (1-8)
SERVICE MODE
SCANNER LED TEST
ADJUST SHADING
ADJUST SHADING
* CHECK NOW *
ADJUST SHADING
OCT-12 10:58 00%