Toner Supply In Abnormal Sensor Conditions - Ricoh G035 Service Manual

DEVELOPMENT
If the front cover is opened and closed while a toner near end/end condition exists,
the machine will attempt to recover the toner near end/end conditions 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 second, 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
10 seconds. 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 16 seconds).

2.5.9 TONER SUPPLY IN ABNORMAL SENSOR CONDITIONS

The TD sensor is checked every print. If the readings from the TD sensor become
abnormal during a print 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 print job. Then at the end of the print job, the
machine generates an SC code requires repair.
The ID sensor is checked every 10 sheets printed. If readings become abnormal,
the machine generates an SC code and requires repair. If this happens during a
print job, Vtref is not changed, the print job is allowed to finish, and then the SC
code is generated.
Details of how the machine determines abnormal sensor detection are in section 7
(Troubleshooting).
G035 2-34 SM