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EPSON Stylus Photo 750 Revision A
Troubleshooting Unit Level Troubleshooting 41
3.2 Unit Level Troubleshooting
This section contains the flow charts which are used to isolate the faulty
unit by following the flow chart according to the problem caused during
replacing or repairing the unit. You are to identify the faulty unit based
on the primary symptom listed in the Table3-4. After this, refer to 3.4
Unit Repair and find and replace the defective parts.
Table 3-4. Symptoms and Corresponding Flow Chart
1. Printer does not operate.
Figure 3-2. Flowchart 1
Symptom Cause Flow Chart
Printer does not
operate.
• No LED goes ON.
• Printer mechanism does not
operate at all.
1
Error is detected.
• LED indicates error.
2
Abnormal printing
operation.
• Printing is not performed.
• Bad printing quality.
• Abnormal printing.
3
Paper Feeding is not
performed correctly.
• Abnormal paper feeding.
• Paper jam occurs.
• Page heading position is not
right.
4
Abnormal Control
Panel
No responds from the printer,
even after pressing switches.
5
Is A C
power voltage
n o rm a l?
YES
Is th e
fuse(F1) of
power supply
Is th e
output voltage
of power supply
norm al?
Exchange the m ain
board.
NO
Input norm al
power supply.
NO
Exchange the fuse.
Disconnect C N10 in
the m ain board and
tu rn th e p o w e r o n
again.
YES
Check output voltage
o f C N 2 in th e p o w e r
supply board.
Exchange the power
supply board
Check the m otor and
h e a d . R efe r to th e
repair item of the
p rin te r m e c h a n is m .
START
END
YES
NO
board
opened?
YES
Is th e
fuse opend
again?
NO