Canon imageFORMULA DR-G1130 マニュアル

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Chapter 1   Before You Start Using the Scanner
Rear View
(1) Ventilation Holes (Exhaust Fan)
Exhausts heat from inside the scanner.
(2) Power Connector
Connect the supplied power cord here
(3) USB Connector (Type B)
Connect the supplied USB cable here. 
CAUTION
Do not block the ventilation holes. Doing so could cause the 
scanner to overheat, creating a fire hazard.
(1)
(2)
(3)