Salter Brecknell 405 - Manual (Page 7)

7
4. Turn the scale over again and carefully remove the top case from
the base. Figure
1.1 shows the current main board and the
calibration jumper (SWCAL) circled. Figure 1.2 shows the older
version of the main board and the calibration jumper (JP1). The
jumper is shown inside the red oval. The oldest version of the main
board is shown in Figure
1.3 .
Figure 1.1 Current main PC board with jumper circled
Figure 1.1 shows the jumper in the calibration unlocked position.
Move the jumper to the other position to lock calibration.