Olivetti d-Color MF4003 Service Manual page 621

d-Color MF4003/MF3303
Mode 1
Mode 2
(3) Fusing temperature control
• The fusing temperature control detects the surface temperature of the fusing roller using the fusing temperature sensor and turns the
fusing heater lamp ON/OFF.
When the fusing heater lamp is turned ON, the fusing roller is heated at the specified temperature.
[7]
[6]
[1] Fusing belt
[3] Fusing heater lamp (HL1)
[5] Heating roller temperature sensor (TEMS)
[7] Heating roller thermistor/Edg (TH1)
(a) Fusing heater lamp
• The heating roller contains a fusing heater lamp assy in it. The fusing heater lamp turns ON to generate heat, which heats the heating
roller and fusing belt.
• The fusing heater lamp assy consists of two heaters, each having a unique heating range different from each other.
• The fusing heater lamp/1 uniformly heats the entire area of the fusing roller.
• The fusing heater lamp/2 heats only the central portion of the fusing roller.
• The fusing heater lamp is turned ON or OFF according to the width of the paper and the surface temperature of the fusing belt.
• For a paper width of 148 mm or less, the fusing heater lamp/2 is used to heat the central portion.
• For a paper width exceeding 148 mm, the surface temperature of the fusing belt is measured and the fusing heater lamp/1 and
the fusing heater lamp/2 are alternately turned ON.
•
[6]
[5]
[4]
[1] Front of machine
[3] Fusing heater lamp/2
[5] Heating roller thermistor/Edg (TH1)
[7] Heating roller temperature sensor (TEMS)
Y119930-3
• When the main body has been in standby mode for 6 hours, the fusing roller is rotated for a
specified distance.
• When the main body has been in power save mode for 13 days, the fusing roller is rotated for a
specified distance. Afterwards, the main body returns to the power save mode.
• Disable
[1]
[2]
[5]
[4]
[7]
[3]
P THEORY OF OPERATION > 1. d-Color MF4003/MF3303
[3]
[2] Pressure roller
[4] Heating roller thermostat (TS1)
[6] Heating roller thermistor/Ctr (TH2)
-
[8]
[1]
[2]
[2] Fusing heater lamp/1
[4] Back of machine
[6] Heating roller thermistor/Ctr (TH2)
[8] Heating roller thermostat (TS1)
P-47
Service Manual