Epson LQ-670 Service Manual page 113

LQ-670 Service Manual
Symptom
Paper feed is Printing is
abnormal. performed, but no
paper feed, or
paper feed is not
done smoothly.
Ribbon feed is The ribbon is not
abnormal. fed.
Printing result is Ink spots or dirt
dirty. are seen around
the printing area.
False printing Printing is
performed even if
there is no paper.
5-18
Table 5-15. Repairing the Printer Mechanism (Con.)
Condition Cause
PF motor is
defective.
The ribbon
cartridge is
defective.
Ribbon is caught
or stuck by the
ribbon mask.
Ribbon feed
mechanism of
the carriage unit
is defective.
Hole of the
ribbon mask is
defective.
Platen gap
adjustment is not
done correctly.
PE sensor is
defective.
PW(TOP)
detector is
defective.
Checkpoint
Measures coil resistance
of PF motor. 16 10%
(Refer to the Table 5-5)
If the coil is short
circuit, check the driver
too .
Remove the ribbon
cartridge. Then rotate
the ribbon feed roller
manually to check if the
ribbon is fed normally.
Check if the ribbon is
fed normally by self-test.
Check if foreign objects
are caught in the ribbon
feed mechanism, or
parts are worn out.
Check if the ribbon
mask is broken.
Check the platen gap.
Check PE detector.
(Refer to the Table 5-7)
---
Solution
Replace the PF motor
(If necessary, replace
the driver)
Replace the ribbon
cartridge.
Replace the Ribbon
mask.
Replace the parts of
the printer mechanism
or carriage unit.
Replace the ribbon
mask.
Perform the platen gap
adjustment.
(Refer to Chapter4)
Replace the PE
sensor.
Replace the PW(TOP)
detector.
Rev. A