Encountering skewed images (tilted output) or image deviation (misalignment/position errors) on your multifunction Konica Minolta bizhub printer can be frustrating. These issues can originate from several sections of the device. This guide provides a structured approach to diagnose and resolve these problems, moving from simple checks to detailed technical adjustments.

Understanding the Problems

• Skewed Image: The printed or scanned content appears slanted or rotated on the page.
• Image Deviation: The content is shifted from its intended position, either in the feed direction (leading/trailing edge) or the main scan direction (side-to-side). It can affect copies, scans, or prints.

The troubleshooting process is divided into two phases for each potential cause area:

1. First Steps: Basic, user-accessible checks and cleaning.
2. Individual Adjustments: Technical procedures typically found in the service manual, to be performed if the first steps fail.

1. Troubleshooting from the ADF (Automatic Document Feeder)

Problems occurring only when using the ADF point to this section.

(1) First Steps of Troubleshooting:

• Check that the original document is correctly placed against the guides and that the document width guide is snug against the paper stack.
• Visually inspect the paper path inside the ADF for scraps of paper, staples, or other foreign objects. Remove any found.
• Examine all rollers (pickup, separation, feed) for dirt, wear, or damage. Clean them with a damp cloth or replace if necessary.
• Check for looseness in the screws of the ADF hinge. Tighten if needed and perform any ADF installation settings via the machine’s service mode.
• Perform a test scan/copy. If the problem persists, proceed to the adjustments below.

(2) Individual Adjustment Items:

• For a Skewed Image:
  • ADF Adjusting the Height: Ensures the ADF is level and at the correct height relative to the scanner glass.
  • Skew Measurement: A calibration to correct for document feed angle errors.
  • Registration Loop Adjustment: (Perform only if #1 and #2 fail). Fine-tunes the timing of the paper feed to correct skew.
• For Image Deviation:
  • Feed Zoom: Adjusts the scaling in the feed direction.
  • FD-Mag. Adj. (B): Adjusts the magnification (scaling) specifically for the back side (B-side) when duplex scanning.
  • Auto Stop Position Adjustment: Corrects where the document stops for scanning. Note: Adjustments 1 and 2 must be completed before this step.

> IMPORTANT NOTE:

• If the problem cannot be solved by the above adjustments, consider replacing the CCD unit.
• If the issue only appears on the back side image after all adjustments, replace the CIS module in the ADF.

2. Troubleshooting from the Scanner / IR Unit

Problems that occur when copying from the flatbed glass (and sometimes manifest with the ADF) may relate to the scanner assembly.

(1) First Steps of Troubleshooting:

• Ensure the original is placed correctly on the scanner glass, aligned with the alignment marks.
• If copying from a thick book, verify the user is not pressing the document cover or ADF too hard. Excessive pressure can hinder the smooth movement of the scanner, causing image deviation.
• Check if the original glass (platen) is installed correctly. Remove and re-seat it if necessary.
• Perform a test. If unresolved, proceed to adjustments.

(2) Individual Adjustment Items:

• Image Deviation: Scanner Area: Run this calibration to correct the scanning start position and alignment of the scanner unit.

> NOTE: If the trouble persists after this adjustment, replace the CCD unit.

3. Troubleshooting from the Paper Feed Tray

Problems that appear on prints (or copies where the source document was fine) may originate from the paper feed section.

(1) First Steps of Troubleshooting:

• Confirm the paper size and type settings on the machine’s control panel match the paper loaded in the tray.
• Check that the paper width guides and length guides in the tray are snug against the paper stack. They should not be too tight or too loose.
  • Pro Tip: For a dedicated tray that always uses one paper size, you can secure the guide with a screw (often found on the back) to prevent user error, but this locks the size.
• Inspect the paper path and the back of the tray for paper debris or foreign objects.
• Check the pickup and separation rollers in the tray for dirt or wear. Clean or replace as needed.
• Perform a test print. If the problem continues, proceed to adjustments.

(2) Individual Adjustment Items:

• For a Skewed Image: Perform Printer Registration Loop Adjustment.
• For Image Deviation (Printer Area): Perform printer-side alignment adjustments.
  • If image deviation on the side (main scan direction) persists, perform the relevant mechanical adjustments:
    • Centering adjustment of the tray.
    • Paper reference position adjustment.

> NOTE: If the above adjustments do not solve the trouble, the issue may lie in the Paper Transport Section (see below).

4. Troubleshooting the Paper Transport Section

This refers to the internal paper path after the paper leaves the tray.

(1) First Steps of Troubleshooting:

• Re-check paper guide settings in the tray as described in Section 3.
• Ensure the Right Door Unit / Regist Unit (often the inner door on the vertical transport path) is fully closed and latched. A half-open unit is a common cause of skew and misalignment.
• Thoroughly inspect the internal paper path, all transport rollers, and the registration roller assembly. Remove any paper pieces, paper dust, or foreign matter.
• Perform a test print. If unresolved, proceed to the adjustment.

(2) Individual Adjustment Items:

• For a Skewed Image: Perform Printer Registration Loop Adjustment.

> NOTE: If the adjustment does not resolve the issue, try to reinstall the Right Door Unit / Regist Unit to ensure it is properly seated and aligned.