Oki IP-6620 Maintenance Manual page 135

(5) ALL PRINT MODES
Select ALL PRINT MODES with the Up and Down buttons, and then press the OK button.
>CHECK PATTERN
 ALL PRINT MODES
Press the OK button to confirm the execution.
>> ALL PRINT MODES
EXECUTE OK?
You may press the CANCEL button to interrupt the printing.
>> ALL PRINT MODES
EXECUTING...
(6) CHECK BIDIRECTION1 to 4
Select CHECK BIDIRECTION1 with the Up and Down buttons, and then press the OK button.
>CHECK PATTERN
 CHECK BIDIRECTION1
Press the OK button to confirm the execution.
>> CHECK BIDIRECTION1
EXECUTE OK?
You may press the CANCEL button to interrupt the printing.
>> CHECK BIDIRECTION1
EXECUTING...
OKI Data Infotech Corporation CONFIDENTIAL
Chapter 3 Maintenance Mode Functions and Operations
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