Epson LQ-670 - Page 102

LQ-670 Service Manual
Rev. A
5-
7
[Abnormal control panel operation]
NO
YES
NO
YES
YES
NO
NO
YES
YES
NO
Turn the power on
without feeding paper
Is voltage
normal?
Replace the
control panel
Replace the power
supply board.
Check output
voltage of the
power supply
board.
Replace the
control panel
Normal?
Replace the main
board.
Normal?
Replace the printer
mechanism
END
Operate each switch to test
the printer operation,
checking LED indications.
Does the
LED indicate
paper out?
Are all
switches&LED
displays
normal?
Figure 5-6. Flowchart 5