If the magnetic heads are dirty, then MICR characters cannot be scanned correctly. Periodically, clean the magnetic heads with a commercially available audio head cleaner.
![](/library/attachments/ServiceWareImages/LDImages/ISG/DRscanners/CR_Caution.gif)
- Before you clean the scanner, turn OFF the scanner and computer, and disconnect the power cord from the power outlet. Otherwise, it may cause an electrical shock.
- Never clean the scanner with any kind of organic solvent, such as alcohol, benzene, or paint thinner. This may cause a fire and electrical shock, or cause the exterior of the scanner to disfigure or discolor.
- Never spray mild detergent or water directly on the scanning glass. The spray could penetrate below the glass and contaminate the light source and lenses.
- Pull the Open button, and pull the Front Maintenance Cover open to the right and left.
![](/library/attachments/ServiceWareImages/LDImages/ISG/DRscanners/CR190_OpenCovers.gif)
![](/library/attachments/ServiceWareImages/LDImages/ISG/DRscanners/CR_important.gif)
If you notice paper dust in the feed path when you open the Maintenance Cover, clean it out with a cotton swab.
- Use a commercially available audio head cleaner to clean the magnetic heads.
The magnetic heads are located in the positions shown in the diagram below.
![](/library/attachments/ServiceWareImages/LDImages/ISG/DRscanners/CR190_MagneticHeads.gif)
- Close the Front Maintenance Cover in the order shown in the diagram below.
![](/library/attachments/ServiceWareImages/LDImages/ISG/DRscanners/CR190_CloseFrontCovers.gif)