6-2 Keysight N9923A Service GuideReplaceable PartsOrdering Information6-Ordering InformationTo order a part listed in the replaceable parts lists:— include the part number— indicate the quantity required— Contact Keysight Technologies for instructions on where to send the order.Refer to“Contacting Keysight” on page 2-6.To order a part that is not listed in the replaceable parts lists:— include the instrument model number and complete instrument serialnumber— include the description and function of the part— indicate the quantity required— Contact Keysight Technologies for instructions on where to send the order.Refer to“Contacting Keysight” on page 2-6.