c0505bizhub 165

Konica Minolta bizhub 165 Error C0505: Fix

The Konica Minolta bizhub 165 error C0505 indicates a thermal regulation failure within the fusing unit. This error message prevents the printer from starting, as the system cannot guarantee that toner will be correctly fused to the media. To fix the Konica Minolta bizhub 165 error C0505, check the fuser lamp and sensor connectivity before performing a system reset.

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Common causes

  • 1Malfunctioning thermistor failing to read heat levels.
  • 2Burned-out heating lamp in the fuser assembly.
  • 3Toner residue buildup on the heat rollers.
  • 4Frayed cabling between the main board and fuser.

Solutions

Quick Diagnosis

If the machine stops shortly after power-on with an alert code, the heat sensors likely did not detect the expected rise in temperature. Check for burnt smells or physical debris.

Step-by-Step Solution

  1. Power off the device and allow the fuser to cool for at least 20 minutes.
  2. Open the maintenance door and verify no paper fragments are stuck against the heating element.
  3. Check the thermistor wiring for any visible damage.
  4. Access the 'Trouble Reset' function via the service menu to clear the error flag.

Prevention and Maintenance

Regularly clean the rollers to prevent toner build-up that blocks heat. Using OEM-approved toner is essential for consistent fuser life.

When to Call a Technician

If the error code recurs after resetting, the fuser lamp or the power circuit may require replacement by an authorized service provider.

Technical Specifications

  • Technology: Monochrome Laser Copier
  • Print Speed: 16 ppm
  • Connectivity: USB 2.0
  • Fuser Cycle: 100,000 pages
  • Compatible Consumables: TN116 Toner
  • Recommended Use: Professional Office
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Inspect Fuser

    Turn off, allow cooling for 20 minutes, and check for paper stuck to the fuser rollers.

  2. 2

    Technical Service Mode

    Enter service mode to perform a trouble reset if temperature levels are normal.

  3. 3

    Electrical Check

    Ensure the thermistor connection is secure and not burnt.

Frequently asked questions

It indicates the fuser unit failed to reach operating temperature within the programmed time.

Yes, it directly prevents printing and requires immediate attention to avoid hardware damage.

This unit requires TN116 toner and standard bizhub developing units.

Avoid overloading paper trays, use recommended paper stock, and keep the printer in a ventilated area.