Trouble Shooting - KERN 440...N Service Manual

6 Trouble Shooting

Power on
↓
Full Segments?
If no display, check battery /adaptor; connection between keyboard—main
board, battery/adaptor—main board.
If missing segments, check fixing of LCD frame, zebra connector under LCD.
↓
Display Zero?
If display [LO], check battery>7.5V, adaptor>9V.
If display [ E] , check internal count.
↓
Proper readout?
If unstable reading, check weighing plate, overload stopper, load cell and wires,
environmental conditions and stable table.
↓
Correct reading?
If not accurate, perform internal calibration.
If cannot reach full capacity, check weighing plate, overload stopper, load cell
and internal zero point.
If always zero, check internal zero point. Internal calibration if necessary.
↓
Proper Data to External Device?
If external device not response, check correct RS232 cable and connection,
application software running correctly, wires connecting D-sub connector and main
PCB.
↓
Normal operation.
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