Ricoh D009, Service Manual

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Development
SM 6-39 D009/D011/D012/D013
Det
ailed
Des
cription
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Toner End
After the machine enters the toner near-mode, it will trigger the toner end alert if any of the
conditions below continue to exist:
ƒ TD sensor output does not reach the target value within 90 copies after the toner
near-end alert ("90" is the default setting for SP2213).
ƒ The ID sensor output from reading the ID sensor pattern (Vsp) is extremely low (light).
ƒ
The averaged TD sensor output Vt exceeds 0.15V.
6.9.7 TONER END RECOVERY
If the front door is opened for 10 seconds and then closed while a toner near end/end
condition exists, the machine will attempt to recover. When the front door is closed, the toner
supply motor turns on to supply toner. The machine checks the TD sensor output 2 seconds
after the main motor turns on (Vtp), and the sensor is checked again every 1 second (Vtp1)
The machine detects the toner concentration using Vref, Vt (10), Vtp, and Vtp1. If the toner
concentration is still too low, the toner supply motor remains on for another 10 seconds while
the machine checks Vt. If toner concentration is judged to be at the standard level, then the
toner near end/end condition is cancelled and K (toner supply coefficient) 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) and then it will switch off.
6.9.8 TONER SUPPLY WITH ABNORMAL SENSORS
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, Vref is not
changed, the copy job is allowed to finish, and then the SC code is generated.
If spare parts are not available, the technician can use SP2-208-1 to temporarily put the
machine in image pixel count mode. ( Chapter 5 Service Tables)