4 Poor transfer
[Symptom]
Regardless of the color, white spots appear entire image area or in the band area.
A: If the symptom occurs in single color, see probable cause A.
B: If the symptom occurs in all colors, see probable cause B.
C: If the symptom disappears after changing the paper, see Probable cause C.
D: If the carrier attaches, see [
3. Carrier attachment to the image
].
[Probable causes and solutions]
A: First transfer condition is inappropriate.
If the first transfer current is high, the opposite charge is applied to the toner at the transfer.
Accordingly, toner returns to the drum and poor transfer occurs. If the transfer current is
low, the electric field necessary to perform the normal toner transfer is not obtained and
poor transfer occurs.
To correct the above, adjust the settings suitable for the paper:
For the transfer current, optimum values exist for the 1st transfer and 2
nd
transfer.
1) For the proper adjustment, the 2
nd
transfer current should be adjusted first then the
1st transfer current.
2) Adjust the first transfer current from following: [Utility/Counter] => [03 Machine Admin.
Setting] => [01 System Setting] => [05 Expert Adjustment] => [06 Process
Adjustment] => [01 Front & Back Density]. However, when too high or too low value
is entered, the adjustment fails.
B: Change Dipswitch 1-0 (To display process adjustment to user screen) from 0 (Default) to 1.
Then, [Process adjustment] key is accessible from COPY (or MACHINE) screen. (COPY
(MACHINE) => [Paper Setting] => [Change] => [Process Adj.] => [2
nd
transfer Offset
(Front) and/or (Back)]) Set appropriate 2
nd
transfer current for each tray referring paper
being used. However, when too high or too low value is entered, the adjustment fails.
C: The set transfer current does not match to the characteristic of the used paper.
Depending on the resistance dispersion of the paper, smoothness and moistness etc, the
proper transfer current setting is different.
Perform adjustment described in the B. If the optimum condition cannot be set, propose
customer to try another paper type.
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