Hitachi HT-4139-48 Instruction Manual page 41

2.5.3 Cleaning of Lower Mirror (back) and Cover Glass (back) for
HT-4139-48
Cleaning of Feed Mechanism
Cover Sheet (back)
（48 type double side）
Caution
CAUTION
If the scanning surface of the reading unit gets dirty from ink, adhesives, or
fingerprints, device failure or reading error may occur. Clean the device
regularly (before operation) and whenever a read error occurs. If the error
persists after cleaning, contact the service personnel. Perforated sheets
produce a lot of dust so frequent cleaning is required.
Lower Mirror (back)
（48type double side）
2. Operation
① Open the Main Cover
② Clean dirt on the surface of the
Cover Sheet (back) and the
Lower Mirror (back) with gauze.
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