15 February 2006 DEVELOPMENT AND TONER SUPPLY
6-77
Detailed
Descriptions
Toner Supply without ID Sensor and TD Sensors
Toner supply can continue even if either or both sensors fails:
Failed Sensor Toner Supply Method
TD sensor ID sensor + Image Pixel Count
ID sensor TD sensor (but Vref is nor updated)
TD and ID sensors Image Pixel Count
Abnormal TD Sensor Output
If this occurs, toner supply is controlled using pixel count and Vsp/Vsg.
Abnormal output detected during initialization of the developer: An SC is
logged and SP2906 (TD Sensor Control Voltage & Check) will display 0.00V.
• During the TD sensor auto adjustment, the TD sensor output voltage (Vt) is 2.5
volts or higher even though the control voltage is set to the minimum value
(PWM = 0). The machine logs SC341 TD Sensor Adjustment Error 1.
• During the TD sensor auto adjustment, the TD sensor output voltage (Vt) does
not come in the target range (3.0 ± 0.1V) within 20 seconds. The machine logs
SC342.
Abnormal output detected during copying: If one of the following conditions is
detected more than 10 times consecutively:
• Vt = 0.5 volts or lower
• Vt = 4.0 volts or higher
Then SC340 (TD Sensor Output Error) is logged.
Abnormal ID Sensor Output
Abnormal output detected during process control at power-on: SC353 or
SC354 is issued. Toner supply during copying will then be controlled using the TD
sensor only, until the machine is repaired.
Abnormal output detected when updating Vref: SC350, 351, or 352 is issued,
and Vref is not updated (the machine uses the current value).
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