Xerox 78xx Toner Motor Removal: A Comprehensive Guide

Replacing the magenta toner motor on your Xerox 7855 model is a critical maintenance task to ensure optimal printer performance. This step-by-step guide simplifies the process, helping you navigate the intricate steps involved in accessing and replacing the toner control unit.

Step 1: Initial Setup

Before beginning the replacement process, prepare the machine for disassembly:

1. Open the Front Cover: Start by opening the front cover to reveal the four toner cartridges.
2. Remove Toner Cartridges: Carefully take out all cartridges to ensure unrestricted access to internal components.

Step 2: Removing Covers and Screws

To access the toner control unit, various covers and screws need to be removed:

1. Back Covers:
2. Bottom Panel:

Step 3: Accessing the Toner Control Unit

With the covers removed, focus shifts to the toner control unit:

1. Open the Back Door:
2. Remove the Circuit Board:
3. Expose the Toner Control Unit:

Step 4: Front-Side Components

To fully access and replace the toner motor, additional steps must be performed on the front side:

1. Remove the Cleaning Blade and Waste Container:
2. Detach the Plastic Covers:

Step 5: Removing the Toner Control Unit

The toner control unit is the primary focus of this process:

1. Detach Green Boards and Clips:
2. Unscrew and Remove the Unit:

Step 6: Reassembly

Once the toner motor is replaced, reassemble the printer:

1. Reverse the Steps: Follow the disassembly steps in reverse to secure all components.
2. Test Functionality: Ensure all cables are properly connected and the printer is operational before closing the machine.

Tips for Safe Replacement

• Use Proper Tools: Equip yourself with a standard Phillips head screwdriver and a 5.5 screwdriver for specific screws.
• Handle Components Carefully: Avoid damaging sensitive parts, especially cables and clips.
• Follow the Video Guide: Refer to the detailed video for visual demonstrations of each step.