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17. MAINTENANCE
Do not disassemble the balance. Contact the local A&D dealer if the balance needs service or repair.
Use the original packing material for transportation.
Do not use organic solvents to clean the balance. Clean the balance with a lint free cloth that
is moistened with warm water and a mild detergent.
The mass of the internal mass may change due to corrosion or other damage caused by the operating
environment, or due to aging. Check the internal mass using an external weight periodically.
18. TROUBLESHOOTING
18-1 Checking the Balance Performance and Environment
The balance is a precision instrument. When the operating environment or the operating method is
inadequate, correct weighing can not be performed. Place a sample on the pan and remove it, and
repeat this several times. If the balance seems to have a problem with repeatability or to perform
improperly, check as described below. If improper performance persists after checking, contact the
local A&D dealer for repair.
Checking that the balance performs properly
Check the balance performance using the self-check function as described in “6-1 Automatic
Response Adjustment / Self Check Function”.
An error display appears when a malfunction is found.
Check the balance repeatability using an external weight. Be sure to place the weight in the
center of the weighing pan.
Check the balance repeatability, linearity and calibrated value using external weights with a
known value.
Checking that the operating environment or weighing method is proper
Operating environment
Is the weighing table solid enough?
Is the balance level? Refer to “3-1 Before Use”.
Is the operating environment free from vibration and drafts?
Is there a strong electrical or magnetic noise source such as a motor near the balance?
Weighing method
Is the weighing pan installed correctly?
Is the RE-ZERO key pressed before placing a sample on the weighing pan?
Is the sample placed in the center of the weighing pan?
Has the balance been calibrated using the internal mass (one-touch calibration)?
Has the balance been warmed up for 30 minutes before weighing?