Service manual

3. Abnormal Control Panel Operation
START
NO
YES
END
YES
YES
NO
NO
Dose
the Operate button
turn power on
and off?
Do the
control panel
buttons function
OK?
Check them using
a multimeter.
Are
they
OK?
Replace the
PNL board.
YES
Is the
problem
connected ?
NO
Is the
FFC connected
correctly ?
YES
Connect the cable
correctly.
Is the
problem
corrected?
END
Check
the FFC using a
multimeter. Is it
OK ?
Replace the FFC.
END
Is the
problem
corrected?
YES
YES
NO
NO
NO
YES
Replace the C186
MAIN board.
END
Check the Operate button
on the control panel using
a mutometer.
Is the
Operate button
OK?
Is the
FFC connected
correctly?
Replace the
PNL board.
Is the
problem
corrected ?
END
YES
Connected the
cable correctly.
Is the
problem
corrected ?
END
Connected the
cable correctly.
Is the
problem
corrected ?
END
Check
pin19 of the
FFC. Is it OK?
Replace the C166
PSB/PSE board.
END
NO
NO
NO
NO
YES
YES
YES
NO
YES
YES
YES
Figure 5-5 Flowchart 3
Troubleshooting LQ-2070 Service Manual
5-8 Rev. A