Epson 2070 Service Manual - Page 139

Table 5-8. Repairing the Printer Mechanism, Symptom, Cause, Checkpoint, Solution

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LQ-2070 Service Manual Troubleshooting Table 5-8. Repairing the Printer Mechanism Problem CR operation is abnormal. ^ ^ Printing is abnormal. ^ ^ ^ ^ ^ Abnormal paper feed. Symptom Cause Checkpoint Solution The CR moves slightly and then stops and all indicators blinks. A foreign object is jammed between both terminals of the HP sensor. CN4 connector removed from the HP sensor. Check the HP sensor. Remove the any foreign object. Check the Connect the CN4 connection of the correctly. connector. The CR moves to the left side (HP side) and strikes the frame of the printer. The HP sensor is defective. Check the operation of the HP sensor. Refer to page 5-2. Replace the HP sensor. No image is printed. Common wires in the printhead FFC are disconnected or there is no continuity. Check the common wires in the printhead FFC. Replace the printhead 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 39.3 ohms. Refer to page 5-1. Replace the printhead. The printhead FFC is disconnected, or there is no continuity. Check the continuity in the FFC. Replace the printhead FFC. Printing is uneven on both edges of the column. Platen parallelism is not adjusted properly. Check the platen parallelism. Refer to page 4-2. Adjust the platen parallelism. The printed result is too light. The printhead is defective. Check if the tip of the dot wire is worn. Replace the printhead. The platen gap is Check the platen Adjust the platen too wide. gap. Refer to gap properly. page 4-2. The PF motor does not rotate at all. The PF motor is defective. Measure the coil resistance of the PF motor. The value is approximately 16 ohms. Replace the PF motor. Rev.A 5-17

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Table 5-8. Repairing the Printer Mechanism
Problem
Symptom
Cause
Checkpoint
Solution
CR operation is
abnormal.
The CR moves
slightly and then
stops and all
indicators
blinks.
A foreign object
is jammed
between both
terminals of the
HP sensor.
Check the HP
sensor.
Remove the any
foreign object.
^
CN4 connector
removed from
the HP sensor.
Check the
connection of the
connector.
Connect the CN4
correctly.
^
The CR moves to
the left side (HP
side) and strikes
the frame of the
printer.
The HP sensor is
defective.
Check the
operation of the
HP sensor. Refer
to page 5-2.
Replace the HP
sensor.
Printing is
abnormal.
No image is
printed.
Common wires
in the printhead
FFC are
disconnected or
there is no
continuity.
Check the
common wires in
the printhead
FFC.
Replace the
printhead 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
39.3 ohms. Refer
to page 5-1.
Replace the
printhead.
^
The printhead
FFC is
disconnected, or
there is no
continuity.
Check the
continuity in the
FFC.
Replace the
printhead FFC.
^
Printing is
uneven on both
edges of the
column.
Platen
parallelism is not
adjusted
properly.
Check the platen
parallelism.
Refer to page
4-2.
Adjust the platen
parallelism.
^
The printed
result is too
light.
The printhead is
defective.
Check if the tip
of the dot wire is
worn.
Replace the
printhead.
^
The platen gap is
too wide.
Check the platen
gap. Refer to
page 4-2.
Adjust the platen
gap properly.
Abnormal paper
feed.
The PF motor
does not rotate at
all.
The PF motor is
defective.
Measure the coil
resistance of the
PF motor.
The value is
approximately 16
ohms.
Replace the PF
motor.
LQ-2070 Service Manual
Troubleshooting
Rev.A
5-17