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(1) Correspondent table of operation mode and waveform

(2) Waveform

Figure (1) (phase pattern : Flat torque 1-2 phase excitation)

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Figure (2) (phase pattern : W1-2 phase excitation)

Figure (3) (phase pattern : Normal torque 1-2 phase excitation)

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These FAN are used to radiate heat in the unit.

The signal level at pin G2/G3 of IC600 becomes high, the FAN is activated. In this case, the pulse signal as shown next page input
to pin P16 of IC600 and the rotation of the FAN is detected.

The signal level at pin P17/R16 becomes high, the FAN is activated. In this case, the pulse signal as shown next page input to pin
P18 of IC600 and the rotation of the FAN is detected.

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This unit is equipped with fan to prevent the developing device from rising in temperature while printing.
The fan rotates at high speed (Approx. 3000 rpm) while printing (controlling the developing device). After printing is finished, it
rotates at low speed (Approx. 2200 rpm) when the temperature of the unit goes up over a fixed one or depending on the number
of printed papers (frequency).
While the fan is rotating at high speed, the voltage of Approx. 21 V is supplied to the fan, however, while rotating at low speed,
the supply voltage is decreased to Approx. 12V.

Each signal wave is as follows:
1. High-speed rotation (typ. 3000 rpm)

2. Low-speed rotation (typ. 2200 rpm)