Ricoh Aficio AP-4510 G065, Service Manual, Page: 258 / 278

IMAGE FUSING AND PAPER EXIT
G065 6-54 SM
6.13.7 FUSING TEMPERATURE CONTROL
There are two fusing lamps: the first
fusing lamp (center: 650 W) [A]
heats the center of the hot roller,
and the second fusing lamp (ends:
550 W) [B] heats both ends of the
hot roller. This arrangement
ensures even heat on all surfaces
of the roller.
In order to control the temperature
of the roller, two high response
thermistors are attached to the unit,
one near the center [C] and one at
the end [D] of the hot roller.
Temperature Control
There are two types of temperature control: On/off control (Default), and Phase
control.
Either mode can be selected with SP1104 (Fusing Temperature Control).
After the machine is powered on, the CPU checks the ac frequency for 500 ms, in
case phase control is selected later for the temperature control, and then switches
on the fusing lamp.
As soon as both the center and end thermistors detect the print ready temperature
(also known as the “re-load” temperature) , the machine can operate. The “reload”
temperature is 30
°
C below the fusing temperature (this depends on SP1105-05,
06). As soon as the thermistors detect the fusing temperature, the CPU switches
the lamps off but frequently switches on/off again in order to maintain the fusing
temperature.
G065D602.WMF
Center
E n d
Center
End
1 8 5 ° C
1 8 0 ° C
M a i n S W O N Re-load
50
200
150
100
° C
155
Fusing Temp.
G065D519.WMF
[A]
[B]
[D]
[C]
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA