Service manual

T echnical B ulletin
PAGE: 1/5
Model:
Bellini-C2 Date: 3-Jul-03 No.: RB070007
Subject: Auto Process Control Summary for Bellini-C2 Prepared by: M.Matsuda
From: 2nd Tech Support Sec. Service Support Dept.
Classification:
Troubleshooting
Mechanical
Paper path
Part information
Electrical
Transmit/receive
Action required
Service manual revision
Retrofit information
Other ( )
The following is a summary of Auto Process Control on the Bellini-C2.
Please note the following abbreviations:
Vsp ID sensor output when reading the solid image areas of the ID sensor pattern.
Vsg ID sensor output when reading the bare drum around the ID sensor pattern.
Vt TD sensor output
VL Drum potential sensor output when reading the solid image exposed areas on the
drum.
VH Drum potential sensor output when reading the halftone exposed areas on the drum.
VD Drum potential sensor output when reading the unexposed areas on the charged
drum
VG Grid voltage (charge voltage)
VB Development bias
Vref The threshold value used for supplying toner to the development unit.
General Principle:
Summarized, the purpose of Auto Process Control is to calibrate the ID and drum potential
sensors and update the values of Vref, VG and LD light intensity so that the machine is
able to maintain the proper image density during normal operation.