Ricoh D017 Service Manual page 184

General Cautions
4.2.7 OTHERS
The toner bottle should be replaced while the main switch is on.
If the optional tray, drum, and optics anti-condensation heaters have been installed,
keep the copier power cord plugged in, even when the copier main switch is turned off.
This keeps the heaters energized.
SM 4-4 D017/D018/D019/D020/D084/D085