ID sensor pattern creation parameters depend on whether automatic process control is switched on or off
with SP3901-001 (Auto Process Control).
If automatic process control is switched on:
• Charge corona grid voltage: Set automatically for the existing conditions around the drum.
• LD power: The value Vh is used to adjust the laser power. The laser diode writes the Vh halftone pattern
on the drum. The reading from this pattern is Vh.
• Development bias: The potential sensor checks the bias voltage when the ID sensor pattern is created
(target voltage: -230V) and boosts the voltage by –280, the voltage set for SP2201-004 (ID Sensor
Pattern Development Potential), to bring the bias to the target voltage of –510.
If automatic process control is switched off:
• Charge corona grid voltage: Set to –800V, the default setting for SP2001-002 (ID Sensor Pattern:
Adj. to Applied Voltage).
• LD power: 185 μW (target drum potential –130V)
• Development bias: -360V, default for SP2201 002 (ID Sensor Pattern: Adj. to Applied Voltage).
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:
Development and Toner Supply
471
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