This Service Manual is organized as follows:
CHAPTER 1, General Introduction, explains the NP6621s features, specifications, and step-by-step
instructions on how to operate the copier.
CHAPTER 2, Copying Processes, shows how the NP6621 generates copies while discussing each of
the steps involved.
CHAPTER 3, Operations and Timing, explains the NP6621s mechanical system by function and
principles behind its electrical system in relation to timing of each operation.
CHAPTER 4, Mechanical System, provides instructions on how to disassemble/assemble and adjust the
NP6621.
CHAPTER 5, Installation, provides points to note when selecting the site of installation and instructions
on how to install the NP6621.
CHAPTER 6, Maintenance and Inspection, gives tables of periodically replaced parts and consumables/
durables as well as a scheduled servicing chart.
APPENDIX contains a general timing chart, general circuit diagrams, and PCB diagrams.
This Service Manual is accompanied by the Service Handbook, which provides information on how to
maintain and inspect the NP6621 through adjustment and troubleshooting work.
Information found in this manual may be updated from time to time for product improvement, and major
updates are communicated in the form of Service Information bulletins.