No Led On Control Panel Lights Up Even With Power Turned On; Abnormal Operation Of Carriage At Power On - Epson 890N - FX B/W Dot-matrix Printer Service Manual

EPSON FX-890/2190
3.2.2 No LED on Control Panel lights up even with power
turned on
Table 3-4. No LED on Control Panel lights up
Step Action and Question
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)
Fuse
Check the electric circuit and printer mechanism,
1
and if they are not short-circuitted, replace the fuse
with a new one.
♦
Is the problem solved?
Connection with connectors
Make sure that the following connectors are
connected properly:
2
• Power Supply Board connector (CN1)
• Power Supply Board ~ Main Circuit Board
(CN2~CN14)
♦
Is the problem solved?
Connection of harness of Control Panel
Make sure that the connectors of Control Panel ~
3
Main Circuit Board (CN1 ~ CN20) are connected
properly.
♦ Is the problem solved?
Harness of Control Panel
Replace the harness of the Control Panel with a new
4
one.
♦ Is the problem solved?
Control Panel
5
Replace the Control Panel with a new one.
♦
Is the problem solved?
Troubleshooting
Step
6
Yes No
7

3.2.3 Abnormal operation of Carriage at power on

Step
Problem
Go to Step 2
solved
Problem
Go to Step 3
1
solved
2
Problem
Go to Step 4
solved
3
Replace the
Go to Step 5
harness.
4
Replace the
Go to Step 6
Control Panel. 5
Troubleshooting Based on Symptoms
Table 3-4. No LED on Control Panel lights up
Action and Question
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?
Table 3-5. Abnormal Carriage operation at power on
Action and Question
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)
Connection with connectors
Make sure that the connectors on the Main Board
are connected properly.
♦ Is the problem solved?
Defective CR HP Detector
Replace the CR HP Detector with a new one.
♦
Is the problem solved?
Defective harness of CR HP Detector
Replace the harness of CR HP Detector with a new
one.
♦
Is the problem solved?
Defective CR Motor
Replace the CR Motor 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
Replace the
Power Supply Go to Step 7
Board.
Go to 3.2.11
Replace the
Electrical
Main Board.
Noise (p.62)
Yes No
Problem
Go to Step 2
solved
Replace the
CR HP Go to Step 3
Detector.
Replace the
harness of CR Go to Step 4
HP Detector.
Replace the
Go to Step 5
CR Motor.
Go to 3.2.11
Replace the
Electrical
Main Board.
Noise (p.62)
56