Epson 2070 Service Manual - Page 138

Repairing The Printer Mechanism

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Troubleshooting LQ-2070 Service Manual 5.6 REPAIRING THE PRINTER MECHANISM This section provides instructions for repairing the printer mechanism. It describes various problems, symptom, likely causes, checkpoints, and solutions. The checkpoint column shows items to be checked, including proper values to be set for each component of the printer mechanism. For replacement and adjustment instructions, see Chapter 3, Disassembly and Assembly, and Chapter 4, Adjustments. If the same symptom recurs after repair, select another item in the list of causes and repair the printer according to those instructions. Table 5-8. Repairing the Printer Mechanism Problem CR operation is abnormal. ^ ^ ^ ^ ^ Symptom Cause Checkpoint Solution When the printer is powered on, the CR motor does not rotate at all. The CR motor is defective. Measure the coil resistance of the motor. Resistance is approximately 2.7 ohms. Replace the CR motor. Refer to page 3-12. When the printer is powered on, the CR motor does not rotate all and all indicators blink. CN11 is disconnected from the main board. Check CN11. Connect CN11 correctly. The CR motor can be rotated when the printer is powered on. But the CR does not move. The timing belt came off the pinon gear of the CR motor. Check the engagement of the timing belt. Reinstall the timing belt correctly. The CR moves slightly and then stops and all indicators blinks. Platen gap is too narrow. Manually move the CR and check that it moves smoothly. The proper platen gap is approximately 0.37 mm. Adjust the platen gap properly. Refer to page 4-2. Printer lacks lubrication or a foreign object is jammed between the oil pad and CR shaft. Manually move the CR and check that it moves smoothly. Check the surface of the CR shaft and oil pad. Replace or lubricate the oil pad. If any foreign object is jamming the carriage, remove it and clean the surface of the CR shaft. Then lubricate the CR shaft. HP sensor is defective. Check the operation of the HP sensor. Refer to page 5-2. Replace the HP sensor. Refer the page 3-8. 5-16 Rev. A

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5.6 REPAIRING THE PRINTER MECHANISM
This section provides instructions for repairing the printer mechanism. It describes various problems,
symptom, likely causes, checkpoints, and solutions. The checkpoint column shows items to be checked,
including proper values to be set for each component of the printer mechanism. For replacement and
adjustment instructions, see Chapter 3, Disassembly and Assembly, and Chapter 4, Adjustments. If the same
symptom recurs after repair, select another item in the list of causes and repair the printer according to those
instructions.
Table 5-8. Repairing the Printer Mechanism
Problem
Symptom
Cause
Checkpoint
Solution
CR operation is
abnormal.
When the printer is
powered on, the
CR motor does not
rotate at all.
The CR motor is
defective.
Measure the
coil resistance
of the motor.
Resistance is
approximately
2.7 ohms.
Replace the CR
motor. Refer to
page 3-12.
^
When the printer
is powered on,
the CR motor
does not rotate all
and all indicators
blink.
CN11 is
disconnected
from the main
board.
Check CN11.
Connect CN11
correctly.
^
The CR motor
can be rotated
when the printer
is powered on.
But the CR does
not move.
The timing belt
came off the
pinon gear of
the CR motor.
Check the
engagement of
the timing belt.
Reinstall the
timing belt
correctly.
^
The CR moves
slightly and then
stops and all
indicators blinks.
Platen gap is
too narrow.
Manually move
the CR and
check that it
moves
smoothly. The
proper platen
gap is
approximately
0.37 mm.
Adjust the
platen gap
properly.
Refer to page
4-2.
^
Printer lacks
lubrication or a
foreign object is
jammed
between the oil
pad and CR
shaft.
Manually move
the CR and
check that it
moves
smoothly.
Check the
surface of the
CR shaft and oil
pad.
Replace or
lubricate the oil
pad. If any
foreign object is
jamming the
carriage,
remove it and
clean the
surface of the
CR shaft. Then
lubricate the CR
shaft.
^
HP sensor is
defective.
Check the
operation of the
HP sensor.
Refer to page
5-2.
Replace the HP
sensor. Refer
the page 3-8.
Troubleshooting
LQ-2070 Service Manual
5-16
Rev. A