Troubleshooting Based On Symptoms; Printer Fails To Operate When Power Is Turned On - Epson 890N - FX B/W Dot-matrix Printer Service Manual

EPSON FX-890/2190

3.2 Troubleshooting Based on Symptoms

You can identify the defective component from the symptom displayed. Table 3-2
below lists the symptoms for various failures so that you can easily identify the
problem. Based on the symptom as mentioned below, identify the problem and take a
remedy by following the appropriate troubleshooting procedure given in Table 3-3 to
Table 3-13.
Table 3-2. Symptoms and Problems
Symptom
Printer mechanism does not operate.
Printer fails to operate
when power is turned on
No LED on control panel lights up.
Carriage moves away from the home position at
power on.
Abnormal carriage
operation at power on.
Carriage returns to home position correctly, but the
printer then fails to enter the READY mode.
Printing is faulty during
No printing at all. Faulty printing. Some dots are
self-test, but carriage
missing from print.
operation is normal.
Abnormal paper feeding The printer prints but does not feed paper properly.
• Faulty LED indication
Abnormal operation of
Control Panel • Input through switches impossible
Data sent from the host Carriage operates normally at power on, and self-test
computer is not printed is executed correctly, but data is not printed. Data
properly. from the computer is not printed properly.
• Defective ribbon cartridge
Abnormal operation of
ribbon • Defective ribbon feed mechanism
Abnormal operation of
Printer mechanism does not operate.
Carriage Unit
Faulty print Printer mechanism operates, but print is faulty.
• "Fatal error" is displayed on the control panel.
Printer goes into fatal
error status when power is • After initialization operation, the printer goes into
turned on. error status.
Troubleshooting
Problem Refer to
p.55
p.56
p.56
p.58
p.57
p.59
p.59
p.60
p.60
p.62
p.63
Troubleshooting Based on Symptoms

3.2.1 Printer fails to operate when power is turned on

Table 3-3. Printer fails to operate when power is turned on
Step Action and Question
Parts below can be the source of this error (Chapter 4 Disassembly and Assembly)
• Fuse
• HP (Home Position) Detector (p.78)
• CR Motor (p.81)
• PF Motor (p.83)
• 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 connectors on the Main Board
2
are connected properly.
♦
Is the problem solved?
Defective CR HP Detector
3
Replace the CR HP Detector with a new one.
♦ Is the problem solved?
Defective CR Motor
4
Replace the CR Motor with a new one.
♦
Is the problem solved?
Defective PF Motor
5
Replace the PF Motor with a new one.
♦ Is the problem solved?
Power Supply Board
6
Replace the Power Supply Board with a new one.
♦
Is the problem solved?
Main Board
7
Replace the Main Board with a new one.
♦ Is the problem solved?
Revision B
Yes No
Problem
Go to Step 2
solved
Problem
Go to Step 3
solved
Replace the
CR HP Go to Step 4
Detector.
Replace the
Go to Step 5
CR Motor.
Replace the PF
Go to Step 6
Motor.
Replace the
Power Supply Go to Step 7
Board.
Go to 3.2.11
Replace the
Electrical
Main Board.
Noise (p.62)
55