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Initial Rotation Period
When the DC controller receives a PRINT signal (PRNT) from the
formatter, the DC controller allows the fusing roller to begin
warming up to approximately 183° C, and starts the main motor
(M1), the pickup motor (M2), and scanner motor (M5). Next, the
laser diode turns ON and generates a sweep beam used to adjust
the laser power (APCIN). After the DC controller receives a
BEAM DETECT signal (
BD) initiated by the sweep beam, the
laser power stabilizes and the sweep beam turns OFF.
The DC controller then turns ON the main motor, switches the
exhaust fan to high-speed rotation, applies AC high voltage and
negative DC high voltage to the primary charging roller, and
applies negative high voltage to the transfer roller to help remove
excess toner.
The developing bias (a negative AC/DC voltage) is applied to the
developing roller 1.16 seconds after the main motor is turned ON,
then positive high voltage is applied to the transfer roller 2.0
seconds after the main motor is turned ON.
When the fusing roller temperature reaches 183°, the MP
(Tray 1) pickup roller clutch solenoid (SL2) energizes and paper is
fed from the tray. If paper feeds from the PC tray (Tray 2),
roughly 10 seconds after Initial Rotation begins, the PC tray
(Tray 2) pickup roller clutch solenoid (SL1) energizes.
5-38 Functional Overview