A shipping warehouse technician receives a report that a high-volume monochrome laser prin… — CompTIA A+ (Core 1 & Core 2)

A shipping warehouse technician receives a report that a high-volume monochrome laser printer is producing documents with faint, repeating double images (ghosting) of previously printed text farther down every page. The technician measures the distance between the top edge of the original text and the top edge of its faint ghost image, finding an exact repeating interval of $3.75\text{ inches}$ ( $95\text{ mm}$ ). Specifications for the printer's internal rollers list the following circumferences:

- Transfer Roller: $1.25\text{ inches}$ ( $32\text{ mm}$ )
- Developer Roller: $1.85\text{ inches}$ ( $47\text{ mm}$ )
- Photosensitive Organic Photoconductor (OPC) Drum: $3.75\text{ inches}$ ( $95\text{ mm}$ )
- Fuser Pressure Roller: $4.50\text{ inches}$ ( $114\text{ mm}$ )

Which of the following components is the primary root cause of this repeating image defect?

Photosensitive drum, due to incomplete electrical discharge or a damaged wiper blade failing to clear residual tonerCevap
B
Fuser pressure roller, due to uncalibrated temperature settings preventing toner adherence on heavy paper media
C
Developer roller, due to uneven magnetic toner bias voltage across the developing cycle
D
Transfer roller, due to excessive positive charge buildup pulling extra toner onto the paper substrate

Cevap

Photosensitive drum, due to incomplete electrical discharge or a damaged wiper blade failing to clear residual toner

In electrophotographic (laser) printers, repeating visual defects occur at regular intervals equal to the circumference of the specific rotating component causing the defect. Because the measured distance between repeating ghost images is

3.75\text{ inches}

, matching the photosensitive drum's specified circumference of

3.75\text{ inches}

, the photosensitive drum (or its cleaning mechanism/erase lamp within the drum assembly) is the root cause.

Adım Adım Çözüm

Identify the defect type and measured interval

The defect is a repeating ghost image occurring every

3.75\text{ inches}

(

95\text{ mm}

In laser printing, cyclical defects repeat at a frequency corresponding directly to the circumference of the failing rotating component (

C = \pi d

Correlate the measured interval to the hardware component specifications

The

3.75\text{ inch}

measurement matches the photosensitive drum circumference (

3.75\text{ inches}

Matching the defect spacing to component circumference isolates the drum as the physical source of the artifact.

Determine the underlying failure mechanism for ghosting at drum frequency

Ghosting occurs during the cleaning or conditioning phase of the electrophotographic process when the erase lamp/cleaning blade fails to neutralize or clear residual latent charge and toner.

When residual charge or toner remains on the drum surface through a full revolution (

3.75\text{ inches}

), it re-transfers onto the paper during subsequent turns, creating a secondary faint ghost image.

Anahtar Kavram

Laser Printer Cyclical Defect Diagnosis & Electrophotographic Process

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