Agilent Technologies 1660A Series User Reference page 82

Before turning on the printer, locate the mode configuration switches
2
on the printer and configure them as follows:
•
The HP QuietJet series printers have two banks of mode function switches
inside the front cover. Push all the switches down to the "0" position as
shown.
•
For the HP 2225D (RS-232 HP ThinkJet) printer, the mode switches are
on the rear panel of the printer. Push all the switches down to the "0"
position as shown .
•
For the HP LaserJet printer, the switch settings can remain in the factory
default settings.
Connecting a Printer
RS-232C Printers
5–9