Process Control - Ricoh FT5233 Service Manual

12 February 1992

1. PROCESS CONTROL

1.1 OVERVIEW
Exposure
Lamp
Voltage
Grid
Bias
Voltage
Drum Thermistor
ID Sensor
V Sensor
As seen in section 1 the copy process around the drum and the copy image
(image and background density) are controlled by many factors.
On this copier, the following items are controlled during the copy process to
maintain good copy quality:
The exposure lamp voltage of the optics section
The grid bias voltage of the drum charge section
The development bias voltage and toner supply of the development
section
The items above use the following electrical components:
The operation panel (manual ID selection and reproduction ratio), ADS
sensor, ID sensor, V sensor, drum thermistor, paper size switches,
color detection switches, and RAM board (drum rotation time and SP
mode data)
Refer to the process control table in the supplement sheet bag for the details
on which electrical component controls which controlled item.
In the following sections, we will explain briefly how the major electrical
components are controlled in the copy process.
ID Sensor Pattern
V Sensor Pattern
(Color)
(Black)
2-1
PROCESS CONTROL
Toner
Supply
Development
Bias
Voltage