How to Troubleshoot a Risograph GR3750

Written by dan harkins
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The Riso Kaguku Corporation's Risograph is a high-speed, multifunctional digital printing system for image copying, scanning, screening and printing at top volume. The Risograph GR3750 is capable of printing 135 high-resolution photo images every minute at 400-by-400 dpi. If your Risograph machine is malfunctioning, try a few troubleshooting steps to find the problem before you call a technician or make costly repairs.

Skill level:
Moderately Easy

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Things you need

  • Replacement ink cartridge (if needed)
  • Manual (see Resources)
  • Soft cloth

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  1. 1

    If you can't turn your GR3750 on, check for proper power. Remove the power cord from the outlet, and plug a working device into the same plug. If it works, return the Risograph's plug to the outlet. Check the power cord's connection to the back of the unit, and ensure that the circuit breaker for that area hasn't switched off.

  2. 2

    Adjust your paper feed mechanism if your paper is slipping. Select "Action" on your display, and set your paper feed pressure adjustment to "Card." If the paper is sticking to the print cylinder surface, you may be using unauthorised paper. If not, use the "Print Position" command at the main menu to lower the vertical print position. Replace your original in the opposite direction from last time and restart the print job.

  3. 3

    Fine-tune your printed images if they're blurred, faint or blotchy. Press "Test Print" four or five times on the main display, and a clear printed image should appear instead of a blurry one. Press the "Scanning Contrast" adjustment key at the main menu to make your copies darker or lighter. If you're getting smudges, clean the print head and loading unit with a clean cloth and try making another copy. Replace your ink cartridge if your prints get progressively fainter.

  4. 4

    Inspect for debris or paper jams. Open the ADF cover on the side of the GR3750, and remove the original and any other debris. Feed the original through again after resetting the print job.

  5. 5

    If your copies have incomplete sections, clean your stage glass with a clean cloth. Inspect the print cylinder; open the side door and make sure there's no debris or other obstructions. Close the door completely. Make another copy, ensuring the stage glass door is completely closed.

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