Epson LQ-570e - Page 69

EPSON LQ-570e/LQ-580 Revision C
T
roubleshooting Repairing the Printer Mechanism
6
9
The printing is too light, or the print
density is not uniform.
The printhead is defective. Verify whether head wire is born or not. Replace the printhead.
The platen gap is properly adjusted.
Set the gap adjustment lever to the first position, and check the
platen gap. The correct PG is 0.33.
Adjust the platen gap. Refer to Chapter 5.
Problem: Paper feed is abnormal.
Printing is performed but the paper is
not fed or is fed uniformly.
Foreign substances are lodged in the
paper path.
Verify the paper path whether any foreign substance is put on.
Remove any foreign substance.
The PF motor dose not drive the
mechanism.
Verify the mechanism whether any foreign substance is put on. Remove any foreign substance.
The PF motor is defective.
Measure the motor coil resistance. It should be about 16 Ω ± 10%.
If the motor is shorted, also verify the drivers on the main board.
Replace the PF motor, (and drivers, if
necessary).
Problem: The ribbon is abnormal.
The ribbon is not turning.
The ribbon cartridge is defective.
Remove the ribbon cartridge, verify to rotate its knob manually, and
to see if the ribbon feeds normally.
Replace the ribbon cartridge.
Foreign substances are caught in the
gears.
Verify whether the RD ratchet rotates when the carriage is moved
manually toward left and right.
Remove any foreign substances.
Otherwise, replace the ribbon feed
mechanism.
The ribbon feed properly only when
the carriage moves in one direction
(i.e., it fails to feed when the carriage
moves in the other direction).
The planetary gear in the ribbon drive
gears is defective.
Move the carriage manually: verify whether the ribbon feed gears
turns in reverse and engages the gear.
Replace the ribbon feed mechanism.
Problem: Paper becomes stained with ink.
Ink stains appear on printed areas.
The ribbon mask is positioned
incorrectly.
Make sure the ribbon mask is in the correct position. Reinstall the ribbon mask.
The platen gap is not adjusted correctly.
Set the gap adjustment lever to the first position, and verify the
platen gap. The correct platen gap is 0.33.
Adjust the platen gap. Refer to the chapter
5 Adjustment.
Problem: Printing continues after the paper ends or when no paper is loaded.
Printing continues past the end of the
page.
The PE detector is defective. Check if the PE detector is bad. Replace the PE detector.
Table 3-3. Repairing the Printer Mechanism
Symptom Cause Check point Solution