Ac Power Distribution - Ricoh M5 Service Manual

6.
Power Distribution
— AC Power Distribution —
When the main switch is turned on, ac input voltage is supplied to the dc power supply board, ac drive
board, and the triac.
After the main board becomes active, it activates the triac, which then supplies ac power to the fusing
lamp. The ac drive board applies ac voltage to the exposure lamp heater when the machine is plug-
ged in.
At the same time, the cooling fan motor (M2) starts rotating at low speed. When the Start key is
pressed, the CPU energizes RA501 to turn on the main motor (Ml), and the cooling fan motor starts
rotating at high speed.
-."
2 - 1 0
May, 25, 1985