Xerox Wide Format 6705 System Manual page 306

ADJ8.1.5.4 LPH Joint Slow Scan Direction Adjustment
Purpose To eliminate the image misalignment (horizontal line misalignment) in the slow scan
direction for the 3 LPH.
Note 8.1.5.1 LPH Focus Rough Adjustment, 8.1.5.2 LPH Density Difference Fine Adjustment
(Light Duty Adjustment), and 8.1.5.3 LPH Joint Fast Scan Direction Adjustment must
already be adjusted correctly.
Check Procedure
1. Load A0 (36") roll paper into Roll 1.
2. Enter the Diag Mode and select IOT DC606 Test Print.
3. Print the Test Pattern by using the following parameter settings.
• 1. Output Image : LPH Adjust
• 2. Quantity : 1 sheet
• 3. Paper Supply : Roll 1
• 4. Media Cut Mode : Fixed Landscape
4. Check for image misalignment (horizontal line misalignment) at the joints of the 3 LPH
(Figure 1: between H1 and J1, H2 and J2, H3 and J3).
Adjustment Procedure
1. Use IOT DC131 NVM Access to change the following NVM values until the image
misalignment (horizontal line misalignment) at the joints if the 3 LPH are eliminated.
Note Compare the amount of horizontal line misalignment at the check location with the
sample at K1 to K4 in Figure 1 and change the scale value (step value) that is
closest to the amount of misalignment.
• When horizontal line misalignment occurs between LPH 1 and 2:
Change the value of 910-410 (LPH 2 (center image) Slow Scan Shift) in the positive or
the negative direction.
(1 step = 0.021 mm (1/2 dot))
Note Changing 910-410 (LPH 2 (center image) Slow Scan Shift) changes the amount of
misalignment of the LPH joint at 2 locations. If you want to make the adjustment only
between LPH 1 and 2, change the values (step value) of 910-410 (LPH 2 (center
image) Slow Scan Shift) and 910-411 (LPH 3 (right image) Slow Scan Shift) by the
same amount.
• When horizontal line misalignment occurs between LPH 2 and 3:
Change the value of 910-411 (LPH 3 (right image) Slow Scan Shift) in the positive or the
negative direction.
(1 step = 0.021 mm (1/2 dot))
2. Save the NVM settings.
Note If the settings is not saved, the changed setting will be lost once the power is turned
OFF.
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3. Return to Check Procedure, check whether the horizontal line misalignment at the joints of
the 3 LPH are no longer noticeable and, if they still are, repeat the adjustment until they are.
910-410 (+)
4. Check the IOT Side Registration and adjust where necessary.
Note If 8.1.1 IOT Side Registration Adjustment was performed, 3.1.1 IIT Side Registration
Adjustment must also be performed.
Chapter 4 Disassembly/Assembly and Adjustment
910-410 (-) 910-411 (-)
910-411 (+)
(Figure 1)
4.3 Adjustment