Scanner White Level Adjustment; White Level Check; White Level Adjustment - Ricoh B156 Service Manual

SCANNER WHITE LEVEL ADJUSTMENT

3.14 SCANNER WHITE LEVEL ADJUSTMENT
Check the scanner white level after the left scale (with the white reference plate),
scanner lamp, 1st or 2nd scanner (carriage), or the lens block assembly is replaced.
If the white level is not correct, adjust the level.

White Level Check

1. Load the following paper (referred to as "standard paper" in this section) into
the paper tray.
• Hammermill Copy Plus, 20 lbs. (North America)
• Ricoh Copy paper for Aficio Color, 100 g (Europe)
2. Print out the ACC test pattern (User Tools – Maintenance – ACC).
3. Put the ACC test pattern on the exposure glass.
4. Stack 250 sheets or more of the standard paper on the ACC test pattern.
5. Scan the ACC pattern.
6. Remove the stack of the standard paper and the ACC test pattern from the
exposure glass.
7. Put Color Chart C-4 on the exposure glass.
8. Activate the full color, text/photo mode.
9. Copy Color Chart C-4.
10. Check whether any of the coloured patches in column 2 (in the gradation
pattern area right below the caption "COLOR CHART C-4") are printed. Also,
check that yellow patch 10 does not contain any other colours.
11. If any of the patches in column 2 is printed, or if yellow patch 10 contains other
colours, adjust the white level (
not required.

White Level Adjustment

1. Perform as instructed in "White Level Check".
2. Activate the SP mode.
3. Select SP5-990-002 and print out the SP mode data list.
4. Select SP4-902-002 (G_DATA1) and read the value.
5. Compare the value with the values in table 1 (when Hammermill Copy Plus is
used) or 2 (when Ricoh Copy paper for Aficio Color is used).
6. Increase or decrease the values in SP4-885-1, 886-1, and 887-1 if necessary.
7. Check the white level as instructed in "White Level Check".
NOTE: The machine may have some other trouble when this adjustment causes
abnormal outputs or when this adjustment is not effective.
B156/B220
CÓPIA NÃO CONTROLADA
White Level Adjustment). If not, adjustment is
3-72
CÓPIA NÃO CONTROLADA
SM