HP Scitex FB950 Printer series - Manual (Page 93)

Clean ionizer needles (quarterly)
Ink dust and debris can collect on the ionizer needles which degrades its ability to eliminate static.
Cleaning the ionizer needles keeps the ionizer bar in optimal performance.
▲ Using the brass brush (A in the photo below) - supplied with the printer), clean the ionizer needles
(A in the photo below) located beneath the ionizer bar (B).
The needles (A in the photo below) run the length of the ionizer bar.
ENWW Clean ionizer needles (quarterly) 87