d-Color MF4003/MF3303
P THEORY OF OPERATION > 1.
d-Color MF4003/MF3303
P-48
(b) Temperature control chart
*An example when a machine is warmed up under a normal ambient condition
0
[1] [3]
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[1]
Main power switch ON
[2]
Warm-up control
[3]
Warm-up completed
[4]
Post-warm-up control
[5]
Pre-standby control
[6]
Standby control (including a countermeasure against
overshoot)
[7]
Print request
[8]
Print control
[9]
Standby
[10]
Entry in sleep mode
[11]
In sleep state
[12]
Fusing belt temperature
(c) Fusing temperature control during warm-up
• To prevent image fixability from being degraded due to environmental changes when the main power switch is turned ON, three
different warm-up modes are incorporated for fusing temperature control.
• The warm-up mode is performed “at low temperatures”, “at ordinary temperatures”, or “under high humidity condition”.
• In the warm-up mode under high humidity condition, the warm-up time is extended to prevent paper from curling and the difference in
temperature between the fusing belt and fusing pressure roller is minimized.
• When the temperature of the fusing belt reaches the warm-up completion temperature, control is passed onto the pre-standby process.
Warm up mode
Environment
Machine interior temperature
Machine interior humidity (absolute humidity
*1)
Warm-up at low temperatures
Less than 18 degrees
Not judged by absolute humidity
Warm-up at ordinary temperatures
18 degrees or more to 32 degrees or less
Less than a predetermined value
Warm-up under high humidity condition
More than 32 degrees
Predetermined value or more
• *1: Absolute humidity: water content contained in the air (1 m3) as steam regardless of the temperature
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[1]
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Service Manual
Y119930-3
Summary of Contents for d-Color MF 4003
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