Epson 2070 Service Manual - Page 130

Abnormal Control Panel Operation, Flowchart 3

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

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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