Epson Stylus COLOR 740 Special Edition Service Manual - Page 97
Table 3-7., Repair of the Printer Mechanism, Symptom, Condition, Cause, Check Point, Solution
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EPSON Stylus Color 440/640/740 Revision A Symptom Abnormal printing Condition Only a particular dot causes abnormal printing. A dot is not printed occasionally. Black specks or dots. A vertical line is not aligned. White line appears in the image data. Table 3-7. Repair of the Printer Mechanism Cause Print head surface is not clean. (dot missing) The head unit is defective. Capping absorber is touching the head surface. Print head surface is not clean. (dot-missing) Check Point Perform the cleaning operation several times and check printing. Perform the cleaning operation several times and check printing. Check the head absorber visually. Perform the cleaning operation several times and check printing. The head FFC is disconnected inside. The head FFC is out of connection. The head unit is detective. I/C is defective. The head FFC is out of connection. The head unit is detective. Check the FFC by using a tester. Check if the head FFC on the board or carriage is connected surely. Perform the cleaning operation several times and check printing. Install the new I/C and perform self-test. Check if the head FFC on the board or carriage is connected surely. Check connection with the head FFC. Bi-directional alignment is not adjusted. Head angle is not correct. Platen gap is not correct. Dot shooting direction is tilted because head surface is not clean I/C is defective. Head unit is defective. Perform Bi-D adjustment. Perform head angle adjustment. Perform platen gap adjustment. Perform the cleaning operation several times and check printing. Install a new I/C and perform the self-test. Perform the cleaning operation several times and check printing. Solution Perform the cleaning. If condition does not improve even after the cleaning, replace the head. Replace the head absorber if it is deformed. Perform the cleaning. Replace the head FFC. Connect the FFC properly. If condition does not improve even after the cleaning, replace the head. Replace I/C. Connect the FFC properly. Replace the head if there is no connection problem with the FFC. Refer to Chapter4. Refer to Chapter4. Refer to Chapter4. Perform the cleaning operation. Replace I/C. Replace the head unit. Chapter 3 Troubleshooting 97