12. Troubleshooting
12
50
438 9152-11/03
04.03
Service
Manual
Key Outputs that should close
12 + 7
22 + 6
32 + 5
43 + 7
53 + 6
63 + 5
74 + 7
84 + 6
94 + 5
05 + 8
A6 + 8
B1 + 2
C1 + 3
D7 + 8
Troubleshooting the keypad in the display unit
When a key is pressed on the keypad of the programme unit, two of the
outputs on the keypad close. By disconnected the flat cable from the display
card, pressing a key and the measuring the resistance between the outputs
that should close, it is possible to determine correct operation of any one
key.
The table below shows the outputs that need to be closed for each key:
18
1
2
3
4
5
6
7
8
9
0
18
1
2
3
4
5
6
7
8
9
0
A
B C D
A
B C D
4231
4232
48
Fig.
48
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