Faulty Print; Epson Fx; Electrical Noise - Epson 890N - FX B/W Dot-matrix Printer Service Manual

EPSON FX-890/2190

3.2.10 Faulty print

Table 3-12. Faulty print
Step Action and Question
Parts below can be the source of this error (Chapter 4 Disassembly and Assembly)
• Ribbon Mask
• Printhead (p.77)
• Printhead FFC
• C524MAIN Board (p.74)
Ribbon Mask
Remove the Ribbon Mask from the Printhead, and
1
make sure that the Ribbon Mask is free from
deformation or damage.
♦
Is the problem solved?
Defective Printhead
2
Replace the Printhead with a new one.
♦ Is the problem solved?
Platen Gap Adjustment (p.95)
3
Adjust the platen gap.
♦
Is the problem solved?
Printhead FFC
4
Replace the Printhead FFC with a new one.
♦
Is the problem solved?
Main Board
5
Replace the Main Board with a new one.
♦ Is the problem solved?
Troubleshooting

3.2.11 Electrical Noise

Yes No Step
1
Problem
Go to Step 2
solved
Replace the
Go to Step 3
Printhead.
2
Problem
Go to Step 4
solved
Replace the
Printhead Go to Step 5
3
FFC.
Go to 3.2.11
Replace the
Electrical
Main Board.
Noise (p.62)
4
5
6
Troubleshooting Based on Symptoms
Table 3-13. Troubleshooting for Electrical Noise
Action and Question
Parts below can be the source of this error (Chapter 4 Disassembly and Assembly)
• C524PSB/PSE/PSH Board (p.76)
• C524MAIN Board (p.74)
External noise
1. Check to see if within 3 m from the printer there is
another electrical apparatus, such as a generator,
radio transmitter or an apparatus incorporating a
motor.
2. Turn off the power to the electrical apparatus in
question or move the printer to a position at least 6
m distant from the apparatus.
♦ Does the problem with electrical noise still occur?
AC grounding
Check the AC power connection.
♦
Is the AC power cable connected and grounded
properly?
Harness of Power Switch
1. Remove the Printer Mechanism. (p.80)
2. Replace the HOUSING ASSY.,LOWER with a new
one.
♦
Is the cable grounded properly?
Grounding of circuit boards
1. Remove the Shield Cover.(p.74)
2. Make sure that the screws for the Power Supply
Board is tightened securely.
♦ Is grounding ensured?
Power Supply Board
Replace the Power Supply Board with a new one.
♦
Is the problem solved?
Main Board
Replace the Main Board with a new one.
♦
Is the problem solved?
Revision B
Yes No
Problem
Go to Step 2
solved
Ask the
customer for
Go to Step 3 repair of the
AC power
connection.
Install the
grounding
Go to Step 4
screw
properly.
Ensure
Go to Step 5
grounding.
Replace the
Power Supply Go to Step 7
Board.
Replace the Problem
Main Board. solved
62