A&D GX-300, Instruction Manual

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19. MAINTENANCE
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.
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.
20. TROUBLESHOOTING
20-1 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 “7-1 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 (especially for GX-200/300/400/600/800/1000, the balance
with a minimum weighing value of 0.001 g)?
Is the balance level? Refer to “3-1 Before Use”.
Is the operating environment free from vibration and drafts? For the
GX-200/300/400/600/800/1000, has the breeze break been installed?
Is there a strong electrical or magnetic noise source such as a motor near the balance?