Epson LQ-570e - Repairing the Printer Mechanism

EPSON LQ-570e/LQ-580 Revision C
T
roubleshooting Repairing the Printer Mechanism
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3.5 Repairing the Printer Mechanism
For detailed procedures for replacing or adjusting matter, refer to Chapter 4, Disassembly
and Assembly and Chapter 5, adjustments. If a problem or symptom occurs, refer to
following tables to try find other potential causes.
Table 3-3. Repairing the Printer Mechanism
Symptom Cause Check point Solution
Problem: The CR motor fails to operate.
The CR motor fails to drive the timing
belt after power on.
Foreign substances are lodged in the
mechanism.
Manually move the timing belt to see if the motor can rotate freely. Remove the foreign substance.
The CR motor is defective.
Measure the motor coil resistance. It should be about 2.7 Ω± 10%.
If the coil is shorted, also verify CR motor driver IC9 on the main
board.
Replace the CR motor (and main board, if
necessary).
Problem: The carriage dose not operate when power on (after carriage has been centered prior to power on manually).
The CR motor rotates, but the carriage
dose not move.
The belt drive or driven pulley is
defective.
Verify the pulleys which are broken or worn. Replace the pulleys.
The timing belt is defective.
Verify the timing belt is set correctly to the carriage. Reset the belt to the carriage.
Verify whether the timing belt is broken or not. Replace the belt.
The carriage moves to the left slightly,
then stops.
The carriage movement is not smooth. Verify whether the carriage moves smoothly when move manually.
lean and lubricate the CR guide shaft or
frame. Otherwise, replace the CR motor.
The carriage moves to the left or right
end, then stops.
The HP detector is defective. Verify the HP detector by multi meter. Replace the HP detector.
Problem: Self test printing is not executed.
The carriage moves, but does not print.
The printhead FFC common wires are
disconnected.
Verify whether FFC is set or not to the printhead or the main board.
Set the FFC to the printhead or the main
board correctly.
The printhead is defective.
Measure the printhead coil resistance. It should be about
29.6
± 3.0 Ω . If the printhead is shorted, also verify the drivers on
the main board.
Replace the printhead, (and drivers, if
necessary).
A particular dot is missing. The printhead is defective.
Measure the printhead coil resistance. It should be about
29.6
± 3.0 Ω . If the printhead is shorted, also verify the drivers on
the main board.
Replace the printhead, (and drivers, if
necessary).
Verify whether head wire is born or not. Replace the printhead.