Epson LX-300+ Service Manual page 64

LX-300+/1170
Table 3-3. Control Panel LED Does Not Light On.
Cause Check Point
Blowout of a fuse on Is a fuse on the power
the power board. board blew out?
Are connectors
Connector is not
connected to the
connected to the
power board
power board.
properly?
Power switch is Is conductivity of the
defective. switch is OK?
Are +5VDC and
Power board is
+35VDC OK when
defective.
the power is on?
Power board and the
Is CN8 connected
main board are not
properly?
connected properly.
Main board is
-
defective.
Control panel harness Is the harness of the
is not connected control panel
properly. connected properly?
Control panel board
or harness is -
defective.
Table 3-4. Printer Mechanism Does Not Operate.
Cause Check Point
Any of CN3 to CN12
Are all connectors
is not connected to the
connected properly?
main board properly.
Main board is
-
defective.
Printer mechanism is
-
defective.
Troubleshooting
Y/N Solution
Check the electric circuit and
YES printer mechanism. If there is no
short circuit, replace the fuse.
NO Replace the power board.
YES Replace the power board.
NO Replace the power board.
NO Connect CN8 properly.
- Replace the main board.
NO Connect the harness properly.
- Replace the control panel.
Y/N Solution
NO Connect them properly.
- Replace the main board.
- Replace the printer mechanism.
Troubleshooting
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?
Revision C
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.
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