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44951501TH Rev.2

7-57

Oki Data CONFIDENTIAL

7. TROUBLESHOOTING

7.5.3 Troubleshooting of image problems

A Faint and faded

across the page

Dirty white area

Entirely blank

Vertical black

stripe/line

Periodic problems

Vertical white

band/line

Fig.7-2

Note! To replace the CU/PU board with a new one, load EEPROM chip data on the

old board and copy it to the new board.

(1) Color is faint and fades across pages (see Fig. 7-2 A). .................................. 7-58

(1-1) Color is faint and fades. ...................................................................7-58

(2) The white area of printed pages is dirty (see Fig. 7-2 B). ............................... 7-59

(2-1) The white area of printed pages is dirty (partially). .........................7-59

(2-2) The white area of printed pages is dirty (all over). .........................7-59

(3) Printed pages are blank (see Fig. 7-2 C). ....................................................... 7-60

(3-1) A printed pages are entirely blank. .................................................7-60

(4) Vertical lines are produced in printed pages. .................................................7-61

(4-1) Fine lines (colored) (see Fig. 7-2 D) ...............................................7-61

(4-2) Fine lines (white) (see Fig. 7-2 F) ..................................................7-61

(5) Print quality problems appear periodically (see Fig. 7-2 E). ..........................7-61

(5-1) Print quality problems appear vertically and periodically. ...............7-61

(6) Color misregistration is signiﬁcant. ................................................................ 7-62

(6-1) The message “Adjusting color” displayed at power on stays

for a short time. .............................................................................7-62

(6-2) Although the REG ADJUST TEST result of the engine

maintenance function is OK, color misregistration occurs. .............. 7-62

(7) Black ﬁlled-in printing ....................................................................................7-62

(7-1) Printed pages are ﬁlled-in black entirely. ........................................ 7-62

(8) Color jobs are printed in monochrome, not in color. ...................................... 7-63

(8-1) False setting of the limited-color printing menu ...............................7-63

Oki C301 Maintenance Manual

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