Temperature Control - Ricoh B291 Service Manual

Temperature Control

B291/B296 (35 cpm)
°C
200
135
130
100
Center
End
50
Main SW ON Re-load
There are two types of temperature control:
• On/off control (Default)
• 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 3 °C below the fusing temperature (this depends on the settings of
SP1105 1~4, 7, 8). 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.
The default temperatures of SP1105 for these models are set 10 ~ 30 degrees
lower than the temperatures for the previous machines. Some new SP codes have
been added and others removed. For details, see Section "5. Service Tables".
SM
CÓPIA NÃO CONTROLADA
°C
200
Fusing Temp.
165°C
145
160°C 140
Center
End 100
50
Main SW ON
6-99
CÓPIA NÃO CONTROLADA
IMAGE FUSING AND PAPER EXIT
B295/B297 (45 cpm)
Fusing Temp.
Center End
Re-load
B291/B295/B296/B297
175°C
170°C
Center
End
B195D929.WMF