Epson LQ-300 + Service Manual page 53

EPSON LQ-300+
Table 3-5. When Power is Applied, the Printer Becomes Fatal Error.
Cause Check Point
CR motor harness is Is CR motor harness
not connected CN10 connected
properly. properly?
CR motor is defective. -
HP detector harness is Is HP detector
not connected harness CN3
properly connected properly?
HP detector is
-
defective.
Power board is Is power voltage
defective. normal?
- -
Table 3-6. Self Test Print is Abnormal.
Cause Check Point
Any of CN3 to CN12
Are all connectors
is not connected to the
connected properly?
main board properly.
Printhead driver is
-
defective.
Are rows aligned
properly when bi-
Bi-d is not correct.
directional printing
is proceeded?
Is there any dot
Printhead is defective.
missing?
Head FFC is not
connected properly or -
broken.
Is printing too light /
weak?
Platen gap is not
correct.
Is there any dirt on
printed documents?
Ribbon mask is Is there any dirt on
defective. printed documents?
Troubleshooting
Y/N Solution
NO Connect it properly.
- Replace the CR motor.
NO Connect it properly.
- Replace the HP detector.
NO Replace the power board.
Replace the main board and printer
-
mechanism.
Y/N Solution
NO Connect them properly.
- Replace the main board.
NO Adjust Bi-D.
YES Replace the printhead.
YES Replace the head FFC.
YES Adjust the platen gap.
YES Adjust the platen gap.
YES Replace the ribbon mask.
Troubleshooting
Table 3-6. Self Test Print is Abnormal.
Cause Check Point
Ribbon mechanism is Is ribbon advanced
defective. properly?
Printer mechanism is
-
defective.
Table 3-7. Paper Feed is Abnormal.
Cause Check Point
RPE detector or BPE
Check the sensors.
detector is defective or
Is there any
not connected
abnormality?
properly.
Switch the release
lever. Is the paper
Paper switching
loading direction
mechanism is
switched?
defective.
Can the release lever
be switched?
When the power is
Printer mechanism
off, can the printer
paper loading
feed paper by
mechanism is
rotating the platen
defective.
knob manually?
PF motor is defective. Is PF motor normal?
PF motor driver is
-
defective.
Table 3-8. Control Panel and Switches Do Not Operate.
Cause Check Point
Is conductivity of
Switch is defective.
the switch is OK?
Control panel
Connect the control
harness is connected
panel harness.
properly?
Control panel board is
defective or the -
harness is defective.
Revision C
Y/N Solution
NO Replace the ribbon mechanism parts.
- Replace the printer mechanism.
Y/N Solution
NO Replace the sensor.
Check the connection to the main
YES
board.
Replace the printer mechanism or
NO
check the connection.
Replace the release sensor or
NO
check the connection.
Replace the printer mechanism or
NO
paper loading mechanism parts.
NO Replace the PF motor.
- Replace the main board.
Y/N Solution
NO Replace the control panel.
NO Connect it properly.
- Replace the control panel.
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