Trouble Shooting - KERN MCN-M Service Manual

6.5 Trouble Shooting

Power on
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Full Segments?
If no display,
• check battery / power adaptor,
• check connection between keyboard—main board,
• check connection between battery / power adaptor—main board.
If missing segments,
• check fixing of LCD frame, zebra connector under LCD.
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Display Zero?
If display [L0 bat], check battery >6.5V, power adaptor ~6V.
If display [ zerohi ] or [ zerolo ] check the load cell connections,
load cell damaged?
If display [ instab ] check weighing platform, overload stopper, load cell and wires,
environment and stable floor.
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Proper readout?
If unstable reading, check weighing platform, overload stoppers, loadcell and wires,
environment and stable floor.
If always zero, check ADC. Linearization if necessary.
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Correct reading?
If not accurate, perform adjustment or linearization.
If cannot reach full capacity, check weighing platform, overload stopper, load cell.
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Buttons functioning?
If some buttons not working, check connection wires. Replace keyboard if needed.
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Interface functioning?
If interface not working, check the connection wires.
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Normal operation.
24 MCN-M-SH-e-2220