Code :

Code: 28
Description: Paper transfer positive bias release error The PWM duty has been 50% or higher for 240 ms. Or, the paper transfer roller clutch does not operate.
Causes: There is a disconnection in the paper transfer bias supply circuit. (Deformation of terminals or springs, dirty bearings) When the contact/separation lever is normal: Bad transfer roller position sensor, harness, or MCU When the contact/separation lever is faulty: Bad transfer roller clutch or MCU

Code: 29
Description: Primary transfer bias open The PWM duty has been 50% or higher for 240 ms.
Causes: There is a disconnection in the primary transfer bias supply circuit. (Dirty or deformed electrodes)

Code: 31
Description: Supply bias error The voltage has been higher than the appropriate control voltage for the target voltage for 240 ms. However, detection is disabled when the calculated control voltage is 5 V or higher.
Causes: There is a short circuit in the supply bias supply circuit (due to deformed terminals or electrodes or conductive foreign matter)

Code: 32
Description: Blade bias error The voltage has been higher than the appropriate control voltage for the target voltage for 240 ms. However, detection is disabled when the calculated control voltage is 5 V or higher.
Causes: There is a short circuit in the blade bias supply circuit.

Code: 33
Description: Charge corona unit bias open The PWM duty has been 50% or higher for 240 ms.
Causes: There is disconnection in the charge corona unit bias supply circuit. (Dirty or deformed electrodes)

Code: 34
Description: Charge corona unit grid bias error The voltage has been higher than the appropriate control voltage for the target voltage for 240 ms. However, detection is disabled when the calculated control voltage is 5 V or higher.
Causes: There is a short circuit in the charge corona unit grid bias supply circuit (due to deformed terminals or electrodes or conductive foreign matters).

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