Hardware⏱️ 3 min read📅 2026-06-15

How to Fix: Why am I getting a "Following unit is out of order." error (SC 990-00) on a Ricoh Aficio MP 4002 SP?

Ricoh Aficio MP 4002 SP error SC 990-00, following unit out of order, hardware issue.

Quick Answer: Check for loose connections or worn-out parts, consider replacing the printer's main board or contacting Ricoh support.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

The 'Following unit is out of order' error (SC 990-00) on a Ricoh Aficio MP 4002 SP printer can be frustrating for users, causing intermittent issues with printing and copying. This error message typically appears randomly, sometimes while the device is in use or sleeping mode, without any apparent warning signs. The issue has been persistent for 4 months, despite efforts to troubleshoot and resolve it.

Given its complexity and intermittent nature, this error can be challenging to diagnose and fix. However, by following the steps outlined below, you should be able to identify and potentially resolve the underlying cause of this error.

🛑 Root Causes of the Error

  • The primary root cause of the 'Following unit is out of order' error on a Ricoh Aficio MP 4002 SP printer is often related to the printer's firmware or software issues. In some cases, outdated or corrupted firmware can lead to this error. Additionally, hardware malfunctions, such as a faulty drum unit or worn-out parts, can also contribute to this issue.
  • Another potential root cause is related to the printer's configuration settings or driver problems. Incorrectly set print queues, printer drivers, or misconfigured network settings can trigger this error. It's essential to ensure that all software and firmware are up-to-date and properly configured.

✅ Best Solutions to Fix It

Firmware Update and Reset

  1. Step 1: Restart the printer and press the 'Menu' button to access the main menu.
  2. Step 2: Select 'System Settings' and then 'Firmware Update.' Follow the on-screen instructions to download and install the latest firmware version from the Ricoh website.
  3. Step 3: Once the firmware update is complete, reset the printer to its default settings by selecting 'System Settings' and then 'Reset' (or 'Restore Factory Defaults').

Hardware Troubleshooting

  1. Step 1: Inspect the drum unit for any signs of wear or damage. If damaged, replace it with a new one according to the manufacturer's instructions.
  2. Step 2: Check the printer's belts and rollers for any signs of wear or misalignment. Clean or replace them as necessary.
  3. Step 3: Verify that all paper trays are properly seated and aligned. Make sure there are no obstructions blocking the paper path.

✨ Wrapping Up

By following these steps, you should be able to identify and potentially resolve the underlying cause of the 'Following unit is out of order' error on your Ricoh Aficio MP 4002 SP printer. If the issue persists after attempting these fixes, it may be necessary to contact a professional printer technician or the manufacturer's support team for further assistance.

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