Toner Supply In Abnormal Sensor Conditions - Ricoh A230 Service Manual

Hide thumbs Also See for A230:

Table of Contents

If the front cover is opened and closed while a toner near end/end condition exists,

the machine will attempt to recover using measurements from the TD sensor.

When the front cover is closed, the toner supply motor turns on to supply toner.

The machine checks the TD sensor output 2 s after the main motor turns on. This

is called Vtp. It is checked again every 1 s, and these values are called Vtp'.

The machine detects the toner concentration using Vtref, Vt(10), Vtp, and Vtp'. If

the toner concentration is still too low, the toner supply motor turns on for another

10s. Then, the machine checks Vt. If toner concentration is at the standard level,

the toner near end/end condition is cancelled and "K" is reset. If toner

concentration has not reached the standard level, the toner supply motor rotates

continuously until it does (maximum motor on time is 16s).

2.6.9 TONER SUPPLY IN ABNORMAL SENSOR CONDITIONS

The TD sensor is checked every copy. If the readings from the TD sensor become

abnormal during a copy job, the machine holds the GAIN factor constant (GAIN is

normally calculated from TD sensor readings) to allow toner supply to vary with

only pixel count for the rest of the copy job. Then at the end of the copy job, an SC

code is generated and the machine must be repaired.

The ID sensor is checked every 10 copies. If readings become abnormal, an SC

code is generated and the machine must be repaired. If this happens during a copy

job, Vtref is not changed, the copy job is allowed to finish, and then the SC code is

If spare parts are not available, the technician can use SP 2-208-1 to temporarily

put the machine in image pixel count mode.

Details of how the machine determines an abnormal sensor detection are in

section 7 (Troubleshooting).

A230/A231/A232