TDS EJ-640 Maintenance Manual page 12

EJ-640 Maintenance Guide
When Manual Cleaning Becomes Necessary
Perform Manual Cleaning Once a Month or More
To keep the stable output condition at all times, perform cleaning once a month or more.
Manual cleaning takes approximately 10 minutes.
Manual Cleaning Is Recommended When the Following Symptoms Occur
It is recommended to perform manual cleaning when any of the symptoms given below
occur and cannot be solved by automatic cleaning functions such as normal cleaning.
Replacing the wipers or felt wipers is also an effective means of improving symptoms.