EPSON FX-890/2190 Revision B
Troubleshooting Troubleshooting Based on Symptoms 61
3.2.9 Abnormal operation of Carriage Unit
Table 3-11. Abnormal operation of Carriage Unit
Step Action and Question Yes No
Parts below can be the source of this error (Chapter 4 Disassembly and Assembly)
• Timing Belt
• CR Motor (p.81)
• HP (Home Position) Detector (p.78)
• Harness of HP Detector
• Ribbon Drive (RD) Assembly (p.92)
• C524MAIN Board (p.74)
1
Checking the connection of connectors
Make sure that the following connectors are
connected properly.
• HP Detector (CN8)
• CR Motor (CN12)
♦Is the problem solved?
Problem
solved
Go to Step 2
2
Timing Belt
Check to see if the driving path of the Timing Belt
is obstructed with foreign matters or the belt is
damaged.
♦Is the Timing Belt free from obstruction or damage?
Go to Step 3
Replace the
Timing Belt.
3
Ribbon Drive Assembly
Operate the Timing Belt by hand and check the
movement.
♦Does the Timing Belt operate smoothly?
Go to Step 4
Replace or
lubricant the
Ribbon Drive
Assembly.
4
Checking the operation of the Carriage Unit
Check to see if you can move the Carriage Unit on
the SHAFT,CR,GUIDE from side to side by hand.
♦Does the Carriage Unit operate smoothly?
Go to Step 5
Refer to
Lubrication
(p.100)
5
Defective HP Detector
Replace the HP Detector with a new one.
♦Is the problem solved?
Replace the
HP Detector.
Go to Step 6
6
Defective harness of HP Detector
Replace the harness of the HP Detector with a new
one.
♦Is the problem solved?
Replace the
harness of
the HP
Detector.
Go to Step 7
7
Defective CR Motor
Replace the CR Motor with a new one.
♦Is the problem solved?
Replace the
CR Motor.
Go to Step 8
8
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 3-11. Abnormal operation of Carriage Unit (continued)
Step Action and Question Yes No
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