Unit Level Troubleshooting; Printer Does Not Operate At Power On - Epson Stylus Photo 720 Service Manual

EPSON Stylus Photo 720 / EPSON Stylus Photo EX3

3.2 Unit Level Troubleshooting

You can identify the troubles, using flowcharts in this section and then find defective
unit. When you find out defective unit, refer to "Unit Repair (Printer Mechanism)" to
find defective components and replace them.
Table 3-4. Symptoms and Problems
Symptom
LEDs do not light.
Printer does not operate at
power on.
Printer mechanism does not operate.
Error is detected Error is indicated by LED indication.
Printing is not performed.
Failure occurs during
Abnormal printing (dot missing, etc.)
printing.
Print quality is poor.
No paper is fed.
Printer does not feed paper
Paper feed is irregular.
correctly.
Paper jam occurs.
Control panel operation is
No response to button access.
abnormal.
Troubleshooting
Problem Flowchart No.
Flowchart 3-1
Flowchart 3-1
Flowchart 3-1
Flowchart 3-1
Flowchart 3-1
Unit Level Troubleshooting

3.2.1 Printer does not operate at power on

Start
No

       
 
Yes
Yes
     
            
No
Check the output
voltage of CN2 on
the power supply.
Yes
No
    
      
     
     
Yes
Replace the MAIN
board.
Check the motors,
printhead, and
other components.
Flowchart 3-1.
Revision A
            

       
Replace the fuse,
disconnect CN10 on
MAIN board, and
turn on power.
No
            
       
Yes
Replace the power
supply.
End
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