About this Manual
This Service Manual is part of the multinational documentation system for the Phaser 790
Printer and DC 2006 Copier./Printer The Service Documentation is used in order to diagnose
machine malfunctions, adjust components and has information which is used to maintain the
product in superior operating condition. It is the controlling publication for a service call. Information
on its use is found in the Introduction of the Service Documentation.
This manual contains information that applies to NASG and ESG copiers.
Service Manual Revision
The Service Manual will be updated as the machine changes or as problem areas are identified.
This Service Manual is divided into nine sections. The titles of the sections and a description of
the information contained in each section are contained in the following paragraphs:
Section 1 Service Call Procedures
This section contains procedures that determine what actions are to be taken during a service
call on the machine and in what sequence they are to be completed. This is the entry level for
all service calls.
Section 2 Status Indicator RAPs
This section contains the diagnostic aids for troubleshooting the Fault Code and non-Fault
Code related faults (with the exception of copy quality problems).
Section 3 Image Quality
This section contains the diagnostic aids for troubleshooting any copy quality problems, as well
as copy quality specifications and copy defect samples.
Section 4 Repairs/Adjustments
This section contains all the Adjustments and Repair procedures.
Repairs include procedures for removal and replacement of parts which have the following
When removal or replacement cannot be determined from the exploded view of the
When there is a cleaning or a lubricating activity associated with the procedure.
When the part requires an adjustment after replacement.
When a special tool is required for removal or replacement.
Use the repair procedures for the correct order of removal and replacement, for warnings, cautions,
Adjustments include procedures for adjusting the parts that must be within specification for the
correct operation of the system.
Use the adjustment procedures for the correct sequence of operation for specifications, warnings,
cautions and notes.
Section 5: Parts Lists
This section contains the Printer/Copier Parts List.
Section 6: General Procedures/Information
This section contains General Procedures, Diagnostic Programs, and Copier Information.
Section 7: Wiring Data
This section contains drawings, lists of plug/jack locations, and diagrams of the power distribution
wire networks in the machine. Individual wire networks are shown in the Circuit Diagrams
contained in Section 2. This section also contains the Block Schematic Diagrams.