Oki ML421 Maintenance Manual - Page 107
Replace Control Board.
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Oki Data CONFIDENTIAL 5 Smearing/missing dots Does ALARM LED blink and display alarm? No Yes See Tables 6.2 and 6.3 for troubleshooting information. Replace Printhead. Remedied? No Yes End Replace Control Board. Remedied? No Yes End Replace Carriage cable or Space motor assy. 42113901 Rev.2 107 /
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42113901
Rev.2
107 /
Oki
Data
CONFIDENTIAL
5
Smearing/missing dots
Does ALARM LED blink and display alarm?
No
Yes
See Tables 6.2 and 6.3 for troubleshooting information.
Replace Printhead.
Remedied?
No
Yes
End
Replace Control Board.
Remedied?
No
Yes
End
Replace Carriage cable or Space motor assy.