Page: 167Service Guide ML520/521Chapter B Illustrated Parts ListingB.1.02 Definition of TermsAssembliesAssemblies are parts grouped under a single description and/or part number. Generally, individual items inan assembly are not available from Okidata.Assemblies are surrounded by broken line boxes in the diagrams.Assemblies will say "Includes xx xx" under theComments section of the tables.Parts in assemblies will say "Part of xx" under theComments section of the tables.BlankOkidata does not recommend stocking this item. This item should be purchased on an As RequiredBasisonly.The availability of this item isNOT guaranteed by Okidata.ConsumableA consumable is a supply item which has a specified life and must be periodically replaced. It ispurchased and installed by the end user. Okidata machines are designed to workexclusively with Okidataconsumables. By using genuine Okidata consumable products, the investment made in the equipment isprotected.DocumentA document is a printed item which supports the service and marketing of a product. Various documentsare available from Okidata.DriversPrinter drivers are updated frequently. Please refer to Okilink II for the latest printer driver information.FirmwareFirmware is revised frequently. Please refer to Okilink II for the latest firmware information.OptionAn option is a part/assembly which is added to a product. The option expands the products functionality.An option may or may not be installed by the end user. Instructions for installation accompany eachoption.Option RSPLOkidata recommends that this part/assembly be on hand for servicing installed options.RSPLOkidata recommends that this part/assembly be on hand for servicing.Technical Service BulletinsTechnical Service Bulletins (TSBs) are also referred to as Okidata's monthly mail.The TSBs contain the latest information on firmware revisions, procedure changes, and technical
