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DRUM LIGHT FATIGUE
7.4 DRUM LIGHT FATIGUE
Leaving the drum exposed to direct sunlight will cause it damage. This damage
creates light fatigue on the drum, an effect that will be visible on the print out.
When the drawer unit is slid out, even if the drum remains in the drawer unit, it will
be exposed to direct and reflected light. Light fatigue will occur if the drum is
exposed for more than 2 minutes.
This section will show how to determine where light fatigue occurred on the image.
Making a print test pattern with SP mode 5-955-18 enables you to determine
whether the drum has light fatigue. Follow this procedure to make a test pattern
with A3 (DTL) in 1C (single color) mode using SP mode.
1. Enter SP mode 5-955.
2. Set SP 5-955-018 to 6 to select the Solid test pattern.
3. Set SP 5-955-001 to 51 to select the LD writing value, 51.
M
4. Press the
5. Select A3 (DTL) size and B/W mode (or another 1C mode).
D
6. Press the
7. Check whether the image has a dark uneven area.
8. If the darker area location is similar to the following figure, replace the drum.
9. After replacing the drum, set SP5-955-001 10 128 and 5-955-018 to 0.
Feed direction
A3/DTL
Light fatigue
through the LD
writing window.
key to change the LD.
key to make a test pattern.
Approximately
Approximately
10 mm
PCC
ID sensor frame
90mm
Approximately
75mm
7-6
24 February, 1999
Light fatigue by
reflected light under
the PCC unit
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