Oki ML421 Maintenance Manual - Page 109
Change Ribbon cartridge.
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7 Ribbon feed trouble Remove the ribbon cartridge. Move carriage to left and right. Does the ribbon drive shaft rotate? No Yes Change Ribbon cartridge. Remove Ribbon feed mechanism. Move carriage to left and right. Does the ribbon drive shaft rotate? No Yes Replace Ribbon feed mechanism. Replace Space motor assy. Oki Data CONFIDENTIAL 42113901 Rev.2 109 /
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42113901
Rev.2
109 /
Oki
Data
CONFIDENTIAL
7
Ribbon feed trouble
Remove the ribbon cartridge.
Move carriage to left and right.
Does the ribbon drive shaft rotate?
No
Yes
Change Ribbon cartridge.
Remove Ribbon feed mechanism.
Move carriage to left and right.
Does the ribbon drive shaft rotate?
No
Yes
Replace Ribbon feed mechanism.
Replace Space motor assy.