c0140FS-4020DN

Kyocera FS-4020DN error C0140: Paper cassette fault

The Kyocera FS-4020DN error C0140 refers to a communication fault between the paper cassette and the unit's internal sensor. This alert stops the printer from detecting available media, effectively locking the device. It typically stems from an improperly inserted tray or dust on the contact sensors. A simple visual inspection and realignment often clear the alert.

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Common causes

  • 1Paper tray incorrectly inserted into the rail.
  • 2Dust buildup on the cassette presence sensor.
  • 3Misaligned side guides forcing the detection mechanism.

Solutions

Quick Diagnosis

If C0140 appears at startup, check the cassette fit. If the tray feels loose or crooked, the presence sensor cannot make proper contact, triggering the code.

Step-by-Step Solution

  1. Completely remove the paper cassette.
  2. Check for any leftover paper scraps inside the printer cavity.
  3. Wipe the sensor contacts on the back of the cassette with a dry cloth.
  4. Adjust the side guides to hold the paper firmly without binding.
  5. Slide the cassette back in until it clicks into place.

Prevention and Maintenance

Handle the tray gently; the sensors are delicate. Clean feed rollers every 50,000 prints to maintain reliability.

When to Call a Technician

If the error persists after cleaning and realignment, a sensor contact may be physically damaged.

Device Technical Specifications

  • Technology: Monochrome Laser
  • Speed: 45 ppm
  • Connectivity: USB, Parallel, Network
  • Feeding capacity: 500-sheet standard + bypass
  • Compatible supplies: TK-352 Toner
  • Recommended use: High-volume corporate environments
  • Official drivers / firmware

Steps to follow

  1. 1

    Remove tray

    Pull the paper cassette completely out of the printer.

  2. 2

    Check sensors

    Clean the paper detection sensor inside the bay with a dry cloth.

  3. 3

    Align guides

    Ensure side guides are adjusted to the paper size without squeezing it.

Frequently asked questions

Error C0140 means the printer is not detecting the paper cassette correctly or there is a faulty detection sensor.

It is a minor operational error. Reinserting the tray or cleaning the contacts usually resolves it.

Standard 64-120 g/m² paper. Very thick paper can cause sensor detection issues.

Avoid overloading trays and perform monthly cleaning of the feed rollers.

Kyocera FS-4020DN error C0140: Paper cassette fault | Vimazdev