Prevention method for random horizontal lines on a halftone
image due to curled ITB from being unused for a long time
[Symptom]
Horizontal lines [a] may appear randomly on a halftone image after leaving the machine for a long time.
The symptom is especially visible in 250mm intervals attributable to a primary transfer roller.
The arrow [b] indicates the direction of feeding.
[Cause]
If a machine is left untouched for a long time, ITB[a] and 8 rollers[b] inside ITB are in contact each other for a long time, and this
condition curls ITB.
The curled part makes tiny space between ITB and the secondary transfer outer roller, therefore discharge phenomenon may be
generated.
If discharge phenomenon is generated, toner on ITB scatters, disarranges the image and this results in the above mentioned
symptom.
[Service work]
The ITB that is curled from being unused for a long time cannot be fixed in a short time. If an ITB is left unused frequently, take
one of the two following measures, a) or b), to prevent ITB from being curled.
a) If ITB is left unused for a long time with the main power ON:
The ITB is rotated every certain period of time to prevent the symptom.
a-1) Go to Service mode (Lv2) > Mode List > COPIER > Option > IMG-TR > and change the setting value of "ITB-MOVE" to "3".
The setting range is from "0" to "10" ("0" by default).
rotated about 60mm every certain period of time.
[Reference] Explain to the customer that the operation noise can be heard even in Sleep (Deep sleep) mode because the service
mode runs every certain period of time.
b) If ITB is left unused for a long time with the main power OFF:
The pressure of the primary transfer roller is released to prevent the symptom.
[Caution]
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