Olivetti d-Color MF4003 Service Manual page 622

d-Color MF4003/MF3303
(b) Temperature control chart
*An example when a machine is warmed up under a normal ambient condition
[1] [3]
[2] [4] [5]
0
[1] Main power switch ON
[3] Warm-up completed
[5] Pre-standby control
[7] Print request
[9] Standby
[11] In sleep state
(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
Warm-up at low temperatures
Warm-up at ordinary temperatures
Warm-up under high humidity condition
• *1: Absolute humidity: water content contained in the air (1 m3) as steam regardless of the temperature
[1]
Service Manual
[7]
[6] [8] [9]
Machine interior temperature
Less than 18 degrees
18 degrees or more to 32 degrees or less
More than 32 degrees
[2]
[4]
[3]
[5] [6]
P THEORY OF OPERATION > 1. d-Color MF4003/MF3303
[10]
[11]
[12]
[2] Warm-up control
[4] Post-warm-up control
[6] Standby control (including a countermeasure against
overshoot)
[8] Print control
[10] Entry in sleep mode
[12] Fusing belt temperature
Environment
[7]
P-48
Machine interior humidity (absolute humidity
*1)
Not judged by absolute humidity
Less than a predetermined value
Predetermined value or more
Y119930-3