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EPSON Stylus Photo 750 Revision A
Troubleshooting Unit Repair (Printer Mechanism) 48
Table 3-12. Repair of the Printing Mechanism Table 3-13. Repair of the Printing Mechanism
Symptom Condition Cause Check Point Solution
Printing is not
performed.
Carriage
moves but no
printing is
performed.
Head FFC is
out of
connection.
Check visually if
the head FFC on
the board or
carriage is
connected firmly.
Connect FFC
properly.
FFC is
disconnected
inside.
Check the FFC
by using a tester.
Replace the
FFC.
I/C is
defective.
Install new I/C
and perform the
self-test.
Replace I/C.
Head Unit is
defective.
If the condition
does not improve
even after 2 or 3
times of cleaning
operation,
replace the head
unit and perform
the self-test.
Replace the
head unit.
Abnormal
printing
Only a
particular dot
causes
abnormal
printing.
Print head
surface is not
clean.
Check the
printing quality
after performing
the cleaning
several times.
Perform
cleaning.
Head unit is
defective.
Check the
printing quality
after performing
the cleaning
several times.
Replace the
head, if the
print quality
does not
recover.
Absorber in
the cap is
touching the
head surface.
Visually check
the condition of
the head
absorber.
Replace the
absorber in
the cap if it is
deformed.
Symptom Condition Cause Check Point Solution
Abnormal
Printing
Sometime
printing is not
performed.
Print head
surface is not
clean.
Perform cleaning
several times
and check the
print quality.
Perform
cleaning.
FFC is
disconnected
inside.
Check the FFC
by using a tester.
Replace the
head FFC.
Head FFC is
out of
connection.
Install new I/C
and perform the
self-test.
Connect Head
FFC firmly.
Head Unit is
defective.
If the condition
does not improve
even after 2 or 3
times of cleaning
operation,
replace the head
unit and perform
the self-test.
Replace the
head unit, if it
does not
recover after
performing
cleaning.
I/C is
defective.
Install the new
I/C and perform
self-test.
Replace I/C.
Black specks
or dots.
The head FFC
is out of
connection.
Check if the
head FFC on the
board or carriage
is connected
surely.
Connect FFC
properly.
The head unit
is defective.
Check
connection with
the head FFC.
Replace the
head if there is
no connection
problem with
the FFC.