Ricoh M5 Service Manual page 125

The switching signal is turned on (switching power) when the TH detects a temperature less than 182
degrees Celsius and is turned off again when TH detects 185 degrees Celsius. The only exception is
when the main motor turns on.
CPU turns on the enable signal constantly, applying full power to the fusing lamp.
To summarize, the CPU controls the fusing lamp in the following ways:
(1) O degrees to 160 degrees -
(2) 160 degrees to 185 degrees -
(3) above 185 degrees
(4) Main motor on
At that time, if the hot roller is less than 185 degrees Celsius, the
. .
The fusing lamp stays continuously on
The
fusing lamp
'The fusing lamp stays off.
As long as the hot roller's temperature is less than 185
degrees, the fusing lamp is continuously on.
switches on and off
3 - 6 7
May, 25, 1985