Brother GT-3 Series Service Manual page 105

4. Solving Print Quality Problems
Flow 5 (Maintenance Unit causes misfiring?)
From previous flow
PH Alignment shifts
vertically?
NO
Remove the Wiper Cleaner Cassette and check if the
Print Head and Print Head Cap rubber position is OK.
Position OK?
YES
Open the Rear Cover DB and remove the Tube Pump.
Is Tube Pump Tube
cracked?
YES
Cracks may
cause ink
leakage.
Replace Tube
and Pump Tube
Max. 12.5 cc of ink
used.
Execute "Powerful" head
cleaning (up to 5 times).
Print a check pattern and count
the number of misfiring nozzles.
All nozzles
firing?
NO
YES
Problem solved.
(No PH replacement)
96
Check if the Plate Spring and Front Head Hold Spring used to
secure the Print Head are properly secured, and if they are in
contact with the rear Positioning Pin properly.
Confirm if any objects behind the PH.
YES
Adjust by checking the actual Nozzle Check
Pattern for alignment.
Adjust the vertical positioning of the
NO
Print Head and Print Head Cap rubber.
Execute "Powerful" cleaning and check
if ink flows to the Tube Pump Tube.
2.5 cc of ink used.
NO
Check Solenoid noise
during Head cleaning. No
problem after 5 times?
YES
NO
Faulty Solenoid
There is no problem with
the Maintenance unit.
The Pump Tube is
clogged.
Replace Tube.
Repeating "Powerful" Head
cleaning 5 times does not
resolve the problem.
GT-3 Series
<Procedure>
1. Remove ink in the Print Head Cap.
2. Execute "Powerful" cleaning.
3. Suction OK if ink remaining in Print
Head Cap. If not, issue is in Tube
Pump.
Ink remaining in
Print Head Cap?
YES
NO
Connect the Print Head Cap and Tube
Pump Tube, and check the connection
between the Tubes.
YES
Connection
OK?
NO
Connect PH and Tube
Pump Tube.
Go to Flow 3.