Epson 680Pro - LQ B/W Dot-matrix Printer Service Manual page 56

EPSON Stylus COLOR 680/777/777i
Table 3-14. Fatal Error indication
Step
Detail phenomenon
No.
1. Check if the Torsion
spring 0.22 comes off
on the both HP sensor
lever.
HP sensor lever
2. Check if the Torsion
spring 0.22 comes off
on the both PE sensor
When the printer is
lever.
turned on, the printer
1
continue the paper
eject sequence even if
the paper is not in the
paper path.
PE sensor lever
3. Check if the CN4
connector cable is
connected on the CN4
on the Main board or
sensor.
4. Check if the HP/PE
sensor work correctly
by using the tester.
Refer to Table 3-2.
Troubleshooting
Check point Remedy
1. Set the Torsion spring
0.22 on the HP sensor
lever.
Torsion spring
0.22
2. Set the Torsion spring
0.22 on the PE sensor
lever.
Tension spring
0.22
3. Connect the CN4
connector cable to the
CN4 on the Main board.
4. Replace the HP/PE
sensor with new one.
5. If the problem is not
solved, replace the Main
board with new one.
Troubleshooting with LED Error Indications
Table 3-15. Fastal Error indication
Step
Detail phenomenon
No.
1. Check if the CR
motor connector is
connected CN12 on
the Main board.
When the printer is 2. Check if the coil
turned on, the CR unit resistance of the CR
2
dose not move at all in motor is about 7.8ohm
the power on sequence. by using the tester.
Refer to Table 3-1.
1. Check if the PF motor
connector is connected
to the CN7.
When the printer is 2. Check if the PF motor
turned on, PF roller coil resistance is about
3
dose not rotate at all in 7.8 ohm by using
the power on sequence. tester.
Revision B
Check point Remedy
1. Connect the CR motor
connector to the CN12
on the Main board.
2. Replace the CR motor
with new one.
3. If the problem is not
solved, replace the Main
board with new one.
1. Connect the PF motor
connector to the CN7 on
the Main board.
2. Replace the PF motor
with new one.
3. If the problem is not
solved, replace the Main
board with new one.
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