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Zorluk: ZorPrinter Technologies and Consumables Maintenance

A systems support specialist is investigating a high-capacity laser printer that continuously outputs completely blank white pages. During diagnostic testing, the specialist performs a half-way stop test by interrupting the print cycle right before paper enters the heating stage. Inspection reveals a fully developed latent image of loose toner deposited on the photosensitive drum surface, but no toner image has been pulled onto the paper. Which of the following components or process failures is the primary cause of this issue?

  1. A malfunctioning transfer roller that fails to apply a strong positive charge to the back of the paperCevap
  2. B
    A damaged primary corona wire that fails to apply a uniform negative charge to the drum during conditioning
  3. C
    A failed laser scanning unit that cannot neutralize selective drum regions during the exposing step
  4. D
    A worn rubber wiper blade that fails to scrape off excess toner during the cleaning step

Cevap

A malfunctioning transfer roller that fails to apply a strong positive charge to the back of the paper
The half-way stop test proves that the laser printing process works up through the development phase, as toner is successfully deposited on the photosensitive drum. The step that moves toner from the drum onto the paper is the transfer step. If the transfer roller fails to apply the positive electrical charge to the back of the paper, the negatively charged toner remains on the drum, resulting in completely blank printed pages.

Adım Adım Çözüm

1
Analyze the results of the half-way print stop test
Toner is correctly attracted to the photosensitive drum, confirming that processing, charging, exposing, and developing steps are functioning.
Since a developed toner image is physically present on the drum before reaching the paper, all EP process steps prior to transfer are operational.
2
Evaluate the mechanism responsible for moving toner from the drum onto paper
The transfer roller (or transfer corona assembly) must pull the negatively charged toner from the drum to the paper by applying a high positive charge to the underside of the paper.
Because the paper leaves the drum completely blank while the drum holds the image, the charge differential needed for transfer is missing.
3
Identify the failing component based on symptoms
The transfer roller is confirmed as the faulty component responsible for the blank print output.
Failure of the transfer roller prevents toner transfer while leaving earlier steps intact.

Anahtar Kavram

Electrophotographic (EP) Laser Printing Process - Transfer Step Failure
Tahmini Süre:1m 30s
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Printer Technologies and Consumables Maintenance

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