Gestetner B070 Service Manual page 1023

BULLETIN NUMBER:
APPLICABLE MODEL:
GESTETNER – 9002/10512
LANIER – LD090/LD0105
RICOH – AFICIO 2090/2105
SAVIN – 4090/40105
SUBJECT: AUTO PROCESS CONTROL SUMMARY
SCOPE:
The following is a summary of Auto Process Control on the B070/B071. Please note that the information
supplied in this TSB is also relevant for the A294/A295/A294II/A295II.
Please note the following abbreviations are used throughout this bulletin:
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:
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.
Copyright     2003 RICOH Corporation. All rights reserved.
CÓPIA NÃO CONTROLADA
TECHNICAL SERVICE BULLETIN
B070/B071 – 011
CÓPIA NÃO CONTROLADA
08/08/2003
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