What to do if Duplo Printer shows 'MASTER COVER OPEN'?
- LLeslie BuckSep 10, 2025
If your Duplo Printer displays 'MASTER COVER OPEN', close the master roll cover.

What to do if Duplo Printer shows 'MASTER COVER OPEN'?
If your Duplo Printer displays 'MASTER COVER OPEN', close the master roll cover.
How to clear ADF PAPER JAM on Duplo Printer?
To clear an 'ADF PAPER JAM' on your Duplo Printer, remove the jammed paper from the ADF.
What to do if Duplo Printer shows 'FRONT-COVER OPEN'?
If your Duplo Printer displays 'FRONT-COVER OPEN', gently close the front cover.
How to fix missing parts of print on Duplo Printer?
If parts of your print are missing, try these steps: First, clean the glass with a dry, soft cloth. Then, check the drum surface for any foreign material; if found, remove the drum, peel off the master, and remove any debris before making a new master. Ensure the master size is correctly set.
How to fix 'USED MASTER FULL' error on Duplo Printer?
If your Duplo Printer shows 'USED MASTER FULL', it means the master ejection core is full. Remove the used master to resolve the issue.
What to do if Duplo Printer shows 'NO INK'?
If your Duplo Printer displays 'NO INK', replace the ink pack with a new one.
What does 'NO MASTER' mean on Duplo Printer?
The 'NO MASTER' message on your Duplo Printer indicates that there is no master roll set. You need to set a new master roll to continue printing.
How to clear MASTER EJECT ERROR on Duplo Printer?
To address a 'MASTER EJECT ERROR' on your Duplo Printer, first, pull out the drum and remove any master remaining on it. If the message appears after master making without master on the drum, open the master ejection box and remove the master.
Why is paper winding on the drum of my Duplo Printer?
If paper is winding on the drum of your Duplo Printer, it may be due to an all-black section on the upper part of the document, which makes paper ejection difficult. Try setting the document upside down and performing master making again.
How to fix MASTER SET ERROR on Duplo Printer?
If you encounter a 'MASTER SET ERROR' on your Duplo Printer, it indicates a problem during master making. Remove any remaining master from the master feed section and ensure the master roll is set properly.
Explains symbols and general safety guidelines to prevent danger.
Lists warnings and cautions for operating the machine safely.
Identifies the location and meaning of warning and caution labels on the machine.
Step-by-step guide to turning the printer power on and off.
Instructions on how to load paper correctly into the feed tray.
How to place documents on the glass plate or in the ADF.
Step-by-step guide to performing a standard print job.
Step-by-step guide for replacing the ink pack when 'NO INK' is displayed.
Instructions for replacing the master roll when it is used up.
Table to diagnose and solve common machine malfunctions.
Explains common error messages and their corresponding solutions.
Procedure to remove jammed paper from the print tray side.











