Vacuum Fan Circuit - Ricoh FT7770 Service Manual

30 April, '89

Vacuum Fan Circuit

2.
The CPU turns the vacuum fan on at the same time as the main motor. To
do so, the CPU supplies +3 volts at CN206-B5. This signal then goes to the
dc drive board, causing the dc drive board to drop CN301-B19 to O volts.
This actuates SSR8 on the ac drive board, and 100 volts ac is applied to the
fan motor. The vacuum fan turns off one minute after the main motor turns
off.
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