To Replace Pcb - KERN 440...N Service Manual

7 To Replace PCB

1. Disassemble top housing of scale.
2. Disconnect PL1, PL2, PL3, JP1 and BZ1 from the PCB. Disassemble the ground wire
screw.
Replace a new PCB. Connect PL1, PL2, PL3, JP1 and BZ1 again.
Assemble the ground wire with screw.
3. Assemble the top housing.
4. Perform internal calibration as described in section 3.
5. Check accuracy of scale at different weight.
440-21N
weight tol.
(g) (g)
10.000 0.003
20.000 0.003 100.00
30.000 0.003 150.00
40.000 0.004 200.00
440-47N
weight tol.
(g) (g)
500.0 0.2
1000.0 0.2
1500.0 0.2
2000.0 0.2
440-35A
weight tol.
(g) (g)
100.00 0.03
200.00 0.03
400.00 0.04
600.00 0.04
6. Check other functions, such as Tare, Menory, Print, Mode and Auto-Off.
8
440-33N
weight tol. weight
(g) (g)
50.00 0.02 100.00
0.02 200.00
0.02 300.00
0.02 400.00
440-49N
weight tol. weight
(g) (g)
1000.0 0.3
2000.0 0.3
3000.0 0.3
4000.0 0.4
440-21A
weight tol. weight
(g) (g)
10.000 0.003 1000.0
20.000 0.003 2000.0
40.000 0.004 4000.0
60.000 0.004 6000.0
440-35N
tol. weight
(g) (g)
0.03 100.0
0.03 200.0
0.03 300.0
0.04 400.0
440-51N
tol. weight
(g) (g)
1000 2 1000
2000 2 2000
3000 2 4000
4000 2 6000
440-49A
tol.
(g) (g)
0.3
0.3
0.4
0.4
440-43N 440-45N
tol. weight
(g) (g) (g)
0.2 200.0
0.2 500.0
0.2 700.0
0.2 1000.0
440-53N 440-55N
tol. weight
(g) (g) (g)
2 1000.0
2 2000.0
2 4000.0
2 6000.0
440...N-SH-e-0840
tol.
(g)
0.2
0.2
0.2
0.2
tol.
(g)
0.6
0.6
0.6
0.6