Abnormal Operation Of Carriage Unit - Epson 890N - FX B/W Dot-matrix Printer Service Manual

EPSON FX-890/2190

3.2.9 Abnormal operation of Carriage Unit

Table 3-11. Abnormal operation of Carriage Unit
Step Action and Question
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)
Checking the connection of connectors
Make sure that the following connectors are
connected properly.
1
• HP Detector (CN8)
• CR Motor (CN12)
♦
Is the problem solved?
Timing Belt
Check to see if the driving path of the Timing Belt
2
is obstructed with foreign matters or the belt is
damaged.
♦ Is the Timing Belt free from obstruction or damage?
Ribbon Drive Assembly
Operate the Timing Belt by hand and check the
3
movement.
♦ Does the Timing Belt operate smoothly?
Checking the operation of the Carriage Unit
Check to see if you can move the Carriage Unit on
4
the SHAFT,CR,GUIDE from side to side by hand.
♦ Does the Carriage Unit operate smoothly?
Defective HP Detector
5
Replace the HP Detector with a new one.
♦
Is the problem solved?
Troubleshooting
Step
Yes No
6
7
8
Problem
Go to Step 2
solved
Replace the
Go to Step 3
Timing Belt.
Replace or
lubricant the
Go to Step 4
Ribbon Drive
Assembly.
Refer to
Go to Step 5 Lubrication
(p.100)
Replace the
Go to Step 6
HP Detector.
Troubleshooting Based on Symptoms
Table 3-11. Abnormal operation of Carriage Unit (continued)
Action and Question
Defective harness of HP Detector
Replace the harness of the 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
harness of
Go to Step 7
the HP
Detector.
Replace the
Go to Step 8
CR Motor.
Go to 3.2.11
Replace the
Electrical
Main Board.
Noise (p.62)
61