Fbs Scanning Position Adjustment (Top-End Registration) - Oki MC860 Maintenance Manual

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5.15.1.4 FBS scanning position adjustment (top-end registration)

Adjust the top-end scanning position (vertical scanning direction).
Reference value Default value
± 1.2 (mm) +8 (+1.1264mm)
Measurement
1) Set the A3 document on FBS.
2) Scan the test chart with FBS at 300 dpi. (Such as Scan To USB Memory)
3) Measure length of the "A" portion as shown in the drawing. If it does not satisfy the
reference value, perform adjustment as described below.
4) If length of "A" portion stays within the reference value, it is the end of measurement.
43967002TH Rev.1
Adjustable range Unit of adjustment
-31 +31 0.1408mm/ step
(– 4.36 4.36mm)
Adjustment
1) Set the FBS top-end registration.
• If the measurement data is short:
=> Adjust the setting value in the negative (-) direction. (Move the scanning top-end
position to the front.)
• If the measurement data is long (If shade is present in the top-end of document)
=> Adjust the setting value in the positive (+) direction. (Move the scanning top-end
position to the rear end.)
When a value is added in the negative (-) direction, the scan image on a PC moves down.
(Because the scanning start position is moved up.)
When a value is added in the positive (+) direction, the scan image on a PC moves up.
(Because the scanning start position is moved down.)
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