How to Clean Pogo-Pin Contacts When Printing Is Only Black Blocks or Lines or Any Other Abnormal Printouts?

If your RW405B prints solid black blocks, black lines, or severely distorted images, the electrical contacts between the printer and the print-head assembly may be dirty. Cleaning the pogo-pin contacts can help restore a reliable connection.

Before you start

• Turn the printer off before removing the print-head assembly.
• Prepare an alcohol wipe or a clean, lint-free cloth with a small amount of alcohol.
• Do not spray liquid directly into the printer, and do not reinstall the assembly until all cleaned surfaces are completely dry.

Clean the contact pins

1. Turn off the printer and open the cover.

2. Press and hold the two release points on the print-head assembly, then carefully remove the assembly.

   

3. Locate the copper pogo-pin contacts on both the printer and the removed print-head assembly. These are the small spring-loaded pins arranged in rows.

   

4. Gently wipe the contact surfaces on both sides with the alcohol wipe or lint-free cloth. Remove visible dust, residue, or buildup without pressing or bending the pins.

   

   Before cleaning: The surface is dirty.

   

   After cleaning: The surface is clean.

    

5. Leave the contacts exposed until they are fully dry.
6. Align the print-head assembly with the printer and install it again. Close the cover and press firmly on the connection area.
7. Turn on the printer and run a test print.

If the problem continues

If the test print still contains abnormal printouts after cleaning, turn the printer off and check that the print-head assembly is seated correctly. If the issue remains, contact support and include a photo of the test print and the printer model.

Important: Do not remove or clean the print-head assembly while the printer is powered on. Do not use excessive liquid or force when cleaning the pogo pins.