Ricoh SP 8400DN Field Service Manual page 1442

Ricoh a3 size black and white laser printer.

Hide thumbs Also See for SP 8400DN:

Table of Contents

7.Detailed Descriptions

Initial µ Count Detection

The machine detects the TD sensor (µ sensor) output while mixing the developer, and stores the output as the

initial µ count.

SP3-030-061 Initial µ count (Line speed 1)

Vt Calculation

The machine refers to the initial µ count with the above SP according to the machine type and calculates Vt

with the difference of the present µ count.

If the initial µ count detected is out of the upper/lower output limit, the machine displays a TD sensor (µ

sensor) calibration error (SC360-01).

After replacing a PCDU and performing the initial TD sensor (µ sensor) setting, the machine forcibly

executes the process control.

Sensor Composition

Used to measure the amount of toner that adhered on the OPC drum

Used to measure the toner density in the developer

An ID sensor consists of a light-receiving element located at the opposite position of LED.

It detects the amount of toner adhered using reflection from the LED.

ID sensor is fixed in the right cover of the mainframe and detects the patch density formed on the center of the

Chapters

Table of Contents