Ricoh Aficio 480W Dolphin-C2 Service Manual page 346

FUSING UNIT
Hot roller Extremely thin (1.6 mm) with two fusing lamps.
Hot roller:
155°C (311°F)
B188D950.WMF
Pressure roller thermistor. Contacts the pressure roller to monitor pressure roller
temperature.
Cleaning roller. Mounted above the hot roller to clean the hot roller and prevent
offset.
Pressure roller. After the ready temperature is attained, more pressure is applied
to compensate for low temperatures until the control temperature is reached.
CPM Down Control. The basic fusing motor speed depends on paper size and
type. However, to maintain the control fusing temperature, the CPU reduces the
copy speed if the fusing temperature falls too far during copying.
Cold Start. If these conditions occur immediately after the main switch is done, a
cold start is done:
• Original exit roller thermistor is less than 18
• Hot roller thermistor is less than 100
For a cold start, the ready temperature changes from 155
roller idles for 1 minute.
Energy Save Mode
Energy Saver
Panel Off
Low Power
Auto Off
Main
195°C (383°F)
Sub
Warm-up Time
120V Version: Both Main (1300W) and Sub (300W) fusing
lamps light to attain the ready temperature of 155
within 110 s. Then, the sub fusing lamp switches off. The sub
lamp is used only during warmup. To maintain the control
temperature, only the main lamp is used.
220 ~ 240V Version: Both lamps switch on until the ready
temperature is attained. Then, both lamps switch on and off to
maintain the control temperature
Hot Roller Control
Temp.
155°C
90°C
Fusing Lamp Off
(Room Temp.)
120V Ver.
1300W
300W
110 sec.
o
C (64.4
o o
C (212 F)
o
Ready Temp.
155°C
155°C
155°C
6-50
28 April 2005
220 ~ 240V Ver.
700W
700W
125 sec.
°
C (311
.
o
F)
o
C to 190 C, and the hot
Recovery Time
° ° ° ° C 63% RH
23
0 s
Within 60 s
---
°
F)