Service Manual
4. Troubleshooting Guide
What’s in this Chapter:
• Maintenance Notice
• Cleaning and Repair Suggestions
Maintenance Notice
Maintenance should be conducted in a clean, dustless working environment with mild humidity and
temperature. The working area should also be as free from vibration as possible and any objects which may
damage (e.g. scratch) scanner components. Make sure that scanner power is off and the power cord and
USB cable are removed before you start working. Take precautions to avoid damage from static electricity
when repairing electronic components. Also, be sure to use parts provided from (or recommended by) the
original manufacturer when it is necessary to replace scanner components to avoid damages caused by part
specification errors.
Cleaning and Repair Suggestions
External housing and object glass: To clean the scanner housing, document cover and object glass, use a
soft, damp cloth and a mild (neutral) detergent or alcohol. Do not use an excessive amount of detergent
which may penetrate the seams around the object glass and damage electronic components, lens, or mirrors
inside. Avoid the use of any corrosive detergent on the glass or housing.
Chassis: When cleaning the chassis, avoid touching or scratching lens, mirrors, and the CCD unit. Use a
vacuum cleaner to remove dust or other debris.
CCD: Adjustment of the CCD is one of the most difficult scanner adjustment tasks. Professional skills and
experience are required to do the job properly. Improper adjustment may cause circuit damage. Therefore,
you are strongly advised to avoid any disassembly of the CCD unit unless absolutely necessary. Contact
your nearest UMAX office if you have any problems or questions.
Mainboard: Large electric currents and static electricity should be kept away from the mainboard. Before
connecting peripheral circuits, be sure of the correct location and procedure for installing to avoid short
circuits.
Others: When installing other components such as motor, inverter or power unit, be sure to install them in
the right positions in order not to interfere with the operation of other elements. Contact your nearest
UMAX office if you have any technical problems.
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