Epson CX4400 - Stylus Color Inkjet, Service Manual

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EPSON Stylus CX4300/CX4400/CX5500/CX5600/DX4400/DX4450 Revision A
TROUBLESHOOTING Troubleshooting 56
• White streak /
abnormal
discharge
Ink is ejected to the Cap from the Print
Head, but printing is not done at all after
cleaning or ink change, or abnormal
discharge occurs.
Head FFC
1. Check if the Head FFC is securely connected to the Print
Head Connectors and the Main Board Connectors (CN1,
CN2).
1. Connect the Head FFC to the Print Head and
the Main Board Connectors.
2. Check if the Head FFC is not damaged. 2. Replace the Head FFC with a new one.
Print Head
1. Check if it returns to normal by performing CL operation
or replacing the Ink Cartridge.
1. Perform CL operation and the Ink Cartridge
replacement specified times.
If it doesn’t work, change the Print Head with
a new one.
Main Board Unit 1. Check if the Main Board is not damaged. 1. Replace the Main Board Unit with a new one.
• White streak/
color unevenness
occurrence
Vertical banding appears against the CR
movement direction. And, it looks like
uneven printing.
[Note]
If the problem is not solved, replace the
CR Motor with a new one.
Adjustment
1. For printing in the Bi-D mode, check if Bi-D Adjustment
has been performed properly.
1. Perform Bi-D Adjustment to eliminate
displacements between the upper and lower
rules. (Refer to
Chapter 5 “ADJUSTMENT”
(p.106) .)
Print Head
1. Check if each segment is printed correctly in the Nozzle
Check Pattern.
1. Perform Head Cleaning and check the Nozzle
Check Pattern. (Refer to Chapter 5
“ADJUSTMENT” (p.106) .)
If the problem is not solved, replace the Print
Head with a new one.
Main Frame
1. Check if there is any foreign material on the Carriage
path.
1. Remove foreign objects from surface of the
Carriage path.
2. Check if the Main Frame has not been deformed. 2. Replace the Main Frame with a new one.
3. Check if the grease is enough on the Carriage path of the
Main Frame.
3. After wiping the grease on the Carriage path
with a dry, soft cloth, coat it with grease.
(Refer to
Chapter 6 “MAINTENANCE”
(p.116) .)
EJ Frame Assy 1. Check if the EJ Frame Assy has not been deformed 1. Replace the EJ Frame Assy with a new one.
Table 3-16. Check point for the poor printing quality
Print Quality
State
Detailed phenomenon
Defective
unit/part name
Check point Remedy
Print Head
Connectors
Head
FFC
CN2 (back side) CN1
CR movement
direction