3.3 UNIT LEVEL TROUBLESHOOTING
You may be able to identify the defective unit just from the symptom
displayed. The table below provides the symptoms for a number of
failures. Once you identify the problem, refer to the flowchart listed in the
right-hand column of the table to determine the cause of the problem.
Table 3-6. Symptoms and Problem Descriptions
Symptom Problem Description Flowchart No.
Abnormal
CR
Operation
• Carriage dose not move at all.
• When the printer is powered on, the CR
moves away from home position after a
moment and stops. All indicator LEDs on
the control panel blinks.
Flowchart 1
Abnormal
Paper
Feed
• Paper is not fed at all.
• When the printer is power on, paper
ejected automatically.
• when paper is loaded, it is ejected
automatically and then the printer
indicates “Ready”.
Flowchart 2-1,
2-2
Abnormal
Control
Panel
Operation
• Control panel indicator LEDs do not light.
• Operate switch does not work.
• Panel switches do not work.
Flowchart 3
Abnormal
Printing
• No image is printed.
• Faulty printing - some dots are not
printing.
Flowchart 4
The repair procedure flowcharts use the following symbols:
START
Start
Processing
Forwarding to
another item
Decision
Branching
END
Return to the
strat of the item
END
Figure 3-2. Flowchart Symbols
1. Abnormal CR Operation
START
Dose the CR motor
rotates when printer is
power on?
Is CN11
connected
correctly?
Connect CN11 correctly.
Check the motor coil
resistance.
Refer to Table3-4.
Is the problem
solved?
Dose the CR motor
stop during or after
initialization?
END
Is it OK?
NO
YES
NO
YES
YES
NO
Replace the
C244MAIN board.
Replace the CR
motor.
NO
NO
YES
Dose the CR motor
move freely by hand
when power off?
YES
Is the Platen gap
adjusted properly?
Is CN4 connected
correctly?
END
Adjust Gap properly. Refer
to Chapter5.
Replace the oil pad on the
carriage unit. clean the CR
shaft, and lubricate the oil
pad and surface of the
shaft.
Is the problem
solved?
END
Connect CN4 correctly.
Is the problem
solved?
END
Dose HP Detector work
correctly? Refer to
Table3-2.
Replace HP detector.
Is the problem
solved?
Is resistance of CR
motor correctly? Refer
to Table 5-4.
A
Replace CR motor.
Is the problem
solved?
Replace the
C244MAIN board.
END
A
YES
NO
NO
YES
YES
NO
YES
END
NO
NO
YES
YES
NO
NO
YES
END
YES
NO
NO
YES
Figure 3-3. Flowchart 1
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