393B4600

OKI B4600 error 393: Technical Fix Guide

The OKI B4600 error 393 occurs when the printer fails to communicate with the imaging unit or drum. This technical fault interrupts printing and is typically resolved by physical cleaning of components. The B4600 is a reliable monochrome laser printer.

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Common causes

  • 1LED head obstruction: Toner dust accumulation on emitter diodes.
  • 2Drum wear: Drum has exceeded lifecycle and fails to hold charge.
  • 3Dirty contact: Toner particles preventing electrical continuity.
  • 4Memory fault: Transient error in the writing head processing.

Solutions

Quick Diagnosis

If the error lamp blinks with code 393, the printer is failing to detect the drum signal or the LED writing heads are obstructed.

Step-by-Step Solution

  1. Open the top cover and remove the toner and drum assembly.
  2. Gently wipe the LED head (on the underside of the lid) with a soft, dry cloth.
  3. Verify that toner dust isn't covering the drum's metallic contacts.
  4. Reinstall all components firmly and power cycle the unit.

Prevention and Maintenance

Never touch the photosensitive drum with bare hands. Perform LED head cleaning every time you install a new toner cartridge.

When to Call a Technician

If cleaning the LED and drum fails, the drum unit might be physically damaged or the controller board could have a fault.

Equipment Technical Data

  • Technology: Digital LED
  • Throughput: 26 ppm
  • Connectivity: USB and Parallel
  • Feeding Capacity: 250-sheet standard tray
  • Compatible Consumables: OKI B4600 series original toner/drum
  • Recommended Use: Small offices and workgroups
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Open cover

    Open top lid and remove the drum/toner assembly.

  2. 2

    Clean LED

    Wipe LED head with a dry cloth.

  3. 3

    Reinstall

    Place components back until they click.

Frequently asked questions

It is related to an incorrect drum unit reading or LED writing head failure.

Clean sensors first; if failure continues, the drum may be worn.

Use original OKI toners to ensure unit compatibility.

Clean the LED head each time you replace the toner cartridge.