7-10
2. Countermeasures against Various Failures
2.4 Key operation is locked up (No key operation)
When key operation is not possible, once turn off power, and then, turn on again.
YES
YES
YES
NO
NO
NO
Keys are locked up.
5V power supply to
CONTROL/MODEM board is OK?
Rectify.
Connections between
CONTROL/MODEM and PANEL boards are OK?
If LCD does not recovers,
exchange CONTROL/MODEM board.
If failure often occurs,
exchange CONTROL/MODEM board.
Exchange CONTROL/MODEM board.
U16 is faulty.
Lock up recovers from the failure after
power is turned off and then on?
To Next Page
Loading...
