Oki IP-6620 Maintenance Manual page 58

3.3.1.4 NOZZLE PRINT button
Used to perform nozzle print (before system firmware ver. 3.00).
Used to perform nozzle print and automatic nozzle map (system firmware ver. 3.00 and later).
NOZZLE PRINT
AUTO NOZZ MAP (before system firmware ver. 3.00)
3.3.1.5 PH. RECOVERY button
Used to perform normal or strong cleaning.
Normal
Strong
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OKI Data Infotech Corporation CONFIDENTIAL
Chapter 3 Maintenance Mode Functions and Operations