Maintenance; Calibration; Cleaning; Troubleshooting - OHAUS AV412 Instruction Manual

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4. MAINTENANCE

4.1 Calibration

Periodically verify calibration by placing an accurate weight on the balance and if calibration is
required, refer to section 3.7.1.

4.2 Cleaning

If cleaning is required, use a soft cloth dampened with water and a mild detergent. Do not allow
liquids to enter the balance. Do not use harsh chemicals to clean the balance, as the finish may
be damaged.

4.3 Troubleshooting

The following table lists common problems, possible causes and remedies. If the problem persists,
contact Ohaus or your authorized Ohaus dealer.
Symptom
Balance will not turn on
Battery indicator is flashing
Balance does not display
accurately
Cannot calibrate the balance
Cannot change Menu settings
Error 7.0
Error 8.1
Error 8.2
Error 8.3
Error 8.4
Error 9.0
Possible Cause
• AC power not connected
• Batteries discharged
• Batteries are weak
• Improper calibration
• Unstable environment
• Calibration menu locked
• LFT set to on
• Unstable weight reading
• Submenu locked
• LFT set to on
• Unstable weight reading
when defining the
reference weight.
• Weight reading exceeds
Power On Zero limit.
• Weight reading below
Power On Zero limit.
• Weight reading exceeds
overload limit.
• Weight reading below
underload limit.
• Internal fault.
Remedy
• Connect AC adapter
• Replace batteries
• Replace batteries
• Perform calibration
• Move balance to a
suitable location
• Turn Calibration menu
lock off
• Turn LFT off
• Eliminate vibration and
drafts.
• Unlock submenu
• Turn LFT off
• Eliminate vibration and
drafts.
• Clear platform.
• Put platform on
balance.
• Clear platform.
• Put platform on
balance.
• Return balance for service.
EN-37