Epson 890N Service Manual - Page 62

Faulty print, Electrical Noise - fx 890 ribbon mask

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EPSON FX-890/2190 3.2.10 Faulty print Table 3-12. Faulty print Step Action and Question Yes No 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. Problem solved Go to Step 2 ♦Is the problem solved? Defective Printhead 2 Replace the Printhead with a new one. ♦Is the problem solved? Replace the Printhead. Go to Step 3 Platen Gap Adjustment (p.95) 3 Adjust the platen gap. ♦Is the problem solved? Problem solved Go to Step 4 Printhead FFC 4 Replace the Printhead FFC with a new one. ♦Is the problem solved? Replace the Printhead FFC. Go to Step 5 Main Board 5 Replace the Main Board with a new one. ♦Is the problem solved? Replace the Main Board. Go to 3.2.11 Electrical Noise (p.62) Revision B 3.2.11 Electrical Noise Table 3-13. Troubleshooting for Electrical Noise Step Action and Question Yes No 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 1 motor. 2. Turn off the power to the electrical apparatus in Go to Step 2 question or move the printer to a position at least 6 m distant from the apparatus. Problem solved ♦Does the problem with electrical noise still occur? AC grounding Check the AC power connection. 2 ♦Is the AC power cable connected and grounded properly? Go to Step 3 Ask the customer for repair of the AC power connection. Harness of Power Switch 1. Remove the Printer Mechanism. (p.80) 3 2. Replace the HOUSING ASSY.,LOWER with a new Go to Step 4 one. ♦Is the cable grounded properly? Install the grounding screw properly. Grounding of circuit boards 1. Remove the Shield Cover.(p.74) 4 2. Make sure that the screws for the Power Supply Board is tightened securely. Go to Step 5 Ensure grounding. ♦Is grounding ensured? Power Supply Board 5 Replace the Power Supply Board with a new one. ♦Is the problem solved? Replace the Power Supply Go to Step 7 Board. Main Board 6 Replace the Main Board with a new one. ♦Is the problem solved? Replace the Main Board. Problem solved Troubleshooting Troubleshooting Based on Symptoms 62

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EPSON FX-890/2190
Revision B
Troubleshooting
Troubleshooting Based on Symptoms
62
3.2.10
Faulty print
3.2.11
Electrical Noise
Table 3-12.
Faulty print
Step
Action and Question
Yes
No
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)
1
Ribbon Mask
Remove the Ribbon Mask from the Printhead, and
make sure that the Ribbon Mask is free from
deformation or damage.
♦
Is the problem solved?
Problem
solved
Go to Step 2
2
Defective Printhead
Replace the Printhead with a new one.
♦
Is the problem solved?
Replace the
Printhead.
Go to Step 3
3
Platen Gap Adjustment
(p.95)
Adjust the platen gap.
♦
Is the problem solved?
Problem
solved
Go to Step 4
4
Printhead FFC
Replace the Printhead FFC with a new one.
♦
Is the problem solved?
Replace the
Printhead
FFC.
Go to Step 5
5
Main Board
Replace the Main Board with a new one.
♦
Is the problem solved?
Replace the
Main Board.
Go to
3.2.11
Electrical
Noise
(p.62)
Table 3-13.
Troubleshooting for Electrical Noise
Step
Action and Question
Yes
No
Parts below can be the source of this error (
Chapter 4 Disassembly and Assembly
)
•
C524PSB/PSE/PSH Board
(p.76)
•
C524MAIN Board
(p.74)
1
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?
Go to Step 2
Problem
solved
2
AC grounding
Check the AC power connection.
♦
Is the AC power cable connected and grounded
properly?
Go to Step 3
Ask the
customer for
repair of the
AC power
connection.
3
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?
Go to Step 4
Install the
grounding
screw
properly.
4
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?
Go to Step 5
Ensure
grounding.
5
Power Supply Board
Replace the Power Supply Board with a new one.
♦
Is the problem solved?
Replace the
Power Supply
Board.
Go to Step 7
6
Main Board
Replace the Main Board with a new one.
♦
Is the problem solved?
Replace the
Main Board.
Problem
solved