Epson FX 1170 Service Manual - Page 123

REV.-A, Table 5-6. Repairing the Printer Mechanism Continued, Set the LEVER, G. - drivers

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REV.-A Problem Self test printing abnormal. Table 5-6. Repairing the Printer Mechanism (Continued) symptom Cause Checkpoint Solution The carriage The common wires Check the common moves, but the self- in the printhead FFC wires in the t e s t printing is not are disconnected, or printhead FFC. executed. there is no continuity. Replace the FFC. The printer does not print a particular dot. The printhead is defective. Measure the coil resistance of the printhead. The resistance should be approximately 16.5 ohms. Check if the dot wire is worn. Replace the printhead. (If any pin is shorted, also check the drivers on the main board. Replace the printhead. The printing is too light or the print density is not uniform. The printhead is defective. The platen gap is not adjusted properly. Check if the tip of the dot wire is worn. Replace the printhead. Set the LEVER, G. ADJUST to O and check the gap between the the printhead and the platen. The correct gap is 0.36-0.40 mm. Adjust the gap as described in "Platen Gap Adjustment" in Chapter 4. Paper feeding abnormal. The printer prints but does not feed paper properly. Foreign substances are lodged in the paper path. Visually check the paper path for any foreign substances. Remove any foreign substances. The MOTOR ASSY, PF is not driving the gear correctly. Check the gears for Replace the damage or wear. defective gear. The MOTOR ASSY., PF is defective. Measure the coil resistance of the MOTOR ASSY., PF. The resistance should be approximately 63 ohms. Replace the MOTOR ASSY., PF. (If any coil is shorted, also check the drivers on the main board. 5-19

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REV.-A
Table 5-6. Repairing the Printer Mechanism (Continued)
Problem
symptom
Cause
Checkpoint
Solution
Self test printing
The carriage
The
common wires
Check the common
Replace the FFC.
abnormal.
moves, but the self-
in the printhead FFC
wires in the
test
printing is not
are disconnected,
or
printhead FFC.
executed.
there is no
continuity.
The printer does
The printhead is
Measure the coil
Replace the
not print a
defective.
resistance of the
printhead.
(If any
particular dot.
printhead.
The
pin is shorted, also
resistance should
check the drivers
be approximately
on the main board.
16.5 ohms.
Check if the dot
Replace the
wire is worn.
printhead.
The printing is too
The
printhead
is
Check if the tip of
Replace the
light or the print
defective.
the dot wire is
printhead.
density is not
worn.
uniform.
The platen gap is
Set the LEVER, G.
Adjust the gap as
not adjusted
ADJUST to O and
described in
properly.
check the gap
“Platen Gap
between the the
Adjustment” in
printhead
and the
Chapter 4.
platen. The correct
gap is 0.36-0.40
mm.
Paper feeding
The printer prints
Foreign substances
Visually check the
Remove any
abnormal.
but does not feed
are lodged in the
paper path for any
foreign
paper properly.
paper path.
foreign
substances.
substances.
The MOTOR
ASSY,
Check the gears for
Replace
the
PF is not driving
damage or wear.
defective gear.
the gear correctly.
The MOTOR
ASSY.,
Measure the coil
Replace the MOTOR
PF is defective.
resistance of the
ASSY.,
PF.
(If any
MOTOR
ASSY.,
PF.
coil is shorted, also
The resistance
check the drivers on
should be
the main board.
approximately 63
ohms.
5-19