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 no t 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
no rm al?
YES
Is th e
fuse(F1) of
power supply
Is th e
output voltage
of power supply
normal?
Exchange the main
board.
NO
Input normal
power supply.
NO
Exchange the fuse.
Disconnect CN 10 in
the main board and
turn th e p o w er o n
again.
YES
Check output voltage
of C N 2 in th e p o w e r
supply board.
Exchange the power
supply board
Check the motor and
he a d . R e fe r to th e
repair item of the
pr in te r m ec h a n is m .
START
END
YES
NO
board
opened?
YES
Is th e
fuse opend
again?
NO