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Description
The power up test sequence has detected a key in the operated condition (Stuck Key). The power up test
sequence is performed every time the unit is turned on (powered up). This test is performed because a
permanently stuck key will inhibit the correct operation of the unit.
Possible Causes
1 A key on the display housing is permanently stuck in the operated condition.
2 One of the upper PCA’s keypad interface chips has failed.
3 Liquid (perhaps perspiration) is present on the surface of the display overlay.
Possible Remedies
1 Remove the keypad connector cable from the upper PCA. Restart the power up sequence; if the
ERROR 5 (Stuck Key) is no longer present, the keypad is the cause. The keypad is typically part of
the display housing. Replace the display housing to correct the problem.
2 Remove the keypad connector cable from the upper PCA. Restart the power up sequence; if the
ERROR 5 (Stuck Key) is still present, the upper PCA is the cause. Replace the upper PCA to correct
this problem.
3 Wipe the surface of the display overlay clean of all liquid. Restart the power up sequence; if the
ERROR 5 (Stuck Key) is no longer present, the liquid was the cause.