EPSON FX-890/2190 Revision B
Troubleshooting Troubleshooting Based on Symptoms 56
3.2.2 No LED on Control Panel lights up even with power
turned on
3.2.3 Abnormal operation of Carriage at power on
Table 3-4. No LED on Control Panel lights up
Step Action and Question Yes No
Parts below can be the source of this error (Chapter 4 Disassembly and Assembly)
• Fuse
• Power Switch
• Control Panel (p.72)
• Harness of Control Panel
• C524MAIN Board (p.74)
• C524PSB/PSE/PSH Board (p.76)
1
Fuse
Check the electric circuit and printer mechanism,
and if they are not short-circuitted, replace the fuse
with a new one.
♦Is the problem solved?
Problem
solved
Go to Step 2
2
Connection with connectors
Make sure that the following connectors are
connected properly:
• Power Supply Board connector (CN1)
• Power Supply Board ~ Main Circuit Board
(CN2~CN14)
♦Is the problem solved?
Problem
solved
Go to Step 3
3
Connection of harness of Control Panel
Make sure that the connectors of Control Panel ~
Main Circuit Board (CN1 ~ CN20) are connected
properly.
♦Is the problem solved?
Problem
solved
Go to Step 4
4
Harness of Control Panel
Replace the harness of the Control Panel with a new
one.
♦Is the problem solved?
Replace the
harness.
Go to Step 5
5
Control Panel
Replace the Control Panel with a new one.
♦Is the problem solved?
Replace the
Control Panel.
Go to Step 6
6
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
7
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 3-5. Abnormal Carriage operation at power on
Step Action and Question Yes No
Parts below can be the source of this error (Chapter 4 Disassembly and Assembly)
• HP (Home Position) Detector (p.78)
• Harness of HP Detector
• CR Motor (p.81)
• C524MAIN Board (p.74)
1
Connection with connectors
Make sure that the connectors on the Main Board
are connected properly.
♦Is the problem solved?
Problem
solved
Go to Step 2
2
Defective CR HP Detector
Replace the CR HP Detector with a new one.
♦Is the problem solved?
Replace the
CR HP
Detector.
Go to Step 3
3
Defective harness of CR HP Detector
Replace the harness of CR HP Detector with a new
one.
♦Is the problem solved?
Replace the
harness of CR
HP Detector.
Go to Step 4
4
Defective CR Motor
Replace the CR Motor with a new one.
♦Is the problem solved?
Replace the
CR Motor.
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 3-4. No LED on Control Panel lights up
Step Action and Question Yes No
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