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21. 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.
22-1 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 (AD-4212A only)
Check the balance performance using the self-check function.
Operation
1 Press and hold the MODE key until RESPONSE is
displayed, and then release the key.
2 The balance automatically starts to check its
internal performance
3 After self-check, the balance displays the results
and returns to the weighing mode.
e.g. “ OK ”
The example above indicates that the result of the
self check is good.
Note
If improper performance is found in the self check,
the balance displays CH no . Contact the local
A&D dealer for repair.
Check the balance repeatability using the calibration weight. Be sure to place the weight in the
center of the weighing pan. Pay attention to the air flow and be sure to use the breeze break.
Check the balance repeatability, linearity and calibrated value using external weights with a
known value.