For example keypad No. 3,6, 9 .It is most often the case, the first thing you check first to use the tester on the keypad that error.Cable min pin to ground and plus to the midpoint of the number keypad.
When use tester on the keypad No. 3,6,9 figures show the value of 5, but we test the normal keypad as an example, the letter j tester shows the value 9.ini definitely not track dropouts, usually not keypad ic, but usually CPU error that hit, you must be careful in terms of ini.replace keypad ic is small, not that big Z2460 Or in jumper.
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