Oki C5100 Maintenance Manual page 84

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2 Dirty background (Fig. 5-2 B )
• Were the image drums exposed to external light for a long time?
YES Replace exposed image drum unit(s).
• NO
YES Replace the fuser unit.
• NO
NO
• YES
NO
• YES
• YES
YES End.
• NO
YES End.
• NO
YES End.
• NO
NO
• YES
Note: When replacing the engine board (RSN PWB), extract EEPROM data from it and copy the
42049001TH Rev.1
Are the rollers of the fuser unit dirty?
Is MEDIA WEIGHT set correctly?
2
LIGHT: 64 to 74 g/m . MEDIUM: 75 to 104 g/m
ULTRAHEAVY: 121 to 203 g/m
Set the MEDIA WEIGHT correctly.
Are the LED head assys connected to the CU board (ARC PWB / OWL PWB) properly?
Connect not properly connected LED head assy(s) to the CU board (ARC PWB / OWL PWB)
correctly.
Are +5V and +3.3V being output to the CU board (ARC PWB / OWL PWB) K, Y, M and C
LED HEAD connector pins?
+3.3V: 14
+5V: 16, 18, 20, 22 and 24
NO Replace the CU board (ARC PWB / OWL PWB).
Replace the LED head assys after checking cable connection. Has the problem been
corrected?
Replace the engine board. Has the problem been corrected?
Replace the high voltage power unit or the belt unit after checking cable connection.
Has the problem been resolved?
Be sure cable connection is established. Are the pins of the image drum units connected
to the contact assy properly (see figure 5-3)?
Connect not properly connected pin(s) to the contact assy correctly.
Replace the image drum units.
data onto a new engine board.
2
. HEAVY: 105 to 120 g/m
2
. TRANSPAREMCY.
Oki Data CONFIDENTIAL
2
.
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