Specifications

11.4.1 Phase Control Mode
The main board sends the fusing lamp trigger pulse (LOW active) [C] to the
ac drive board. PC402 activates TRC402, which provides ac power to the
fusing lamp at the trailing edge of each trigger pulses. The trigger pulse goes
HIGH when the main board receives the zero cross signal.
The amount of time that power is applied to the fusing lamp [D] depends on
the temperature of the hot roller.
The trigger pulse (LOW part) is wider [C1] when the hot roller temperature is
lower, and it is narrower [C2] when the hot roller is near the operating
temperature.
AC Power
Zero Cross
Trigger Low Temp
Fusing Lamp Power
Trigger High Temp
Fusing Lamp Power
C1
B
D1
C2
D2
A
1 December 1990
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