2.Image Quality Problems
644
Cause:
Shock jitter occurs when the trailing edge of the paper leaves the paper guide during paper transfer,
causing toner scattering. This may occur when paper with a thickness equivalent to Paper Weight 4 or
higher is used.
ï‚· To adjust the following settings, register beforehand the type of paper that you are using as a
custom paper.
ï‚· Changing the transfer current may produce either or both of the following side effects:
1. Reduction in toner yields
2. Occurrence of banding (streaks)
Solution:
1. In Advanced Settings for the custom paper in use, select Image Transfer Current Setting.
2. Check the present value. Is it lower than 100 uA?
Perform all the following:
(1) Increase the value by 5 uA in Image Transfer Current Setting.
(2) Set Paper Transfer Current; Trail Edge to "200%". (SP2-645-100 to 178: Trail Edge
Corr Coef:2nd Custom Paper 100 to 178)
(3) Set Paper Transfer Current; Trail Edge Dist to "30 mm". (SP2-646-100 to 178: Trail
Edge Corr Switch:2nd Custom Paper 100 to 178)
Consult the product specialist.
3. Print the image. Is the problem resolved?
Repeat Steps 1 to 3. If the problem persists even though you have increased the value to
100 uA, consult the product specialist.
Toner Scatter 4
Cause:
The belt cleaning unit entrance seal in contact with the ITB prevents toner scatter, but toner can still
accumulate on the surface of the belt. Also, toner scatter occurs more easily as the adhesion of toner to
the belt weakens when the belt nears the end of its service life. When printing under these conditions,
the vibration from operation of the drive system can cause more toner scatter when using some types
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