Detailed Check Flow - Brother GT-3 Series Service Manual

4-1-1. Detailed Check Flow

If misfiring occurs, determine the cause by following the procedures in Flow 1 to 6 on the following pages as
necessary. If the problem remains unresolved, replace the Print Head.
<Note>
・ After head cleaning, print a check pattern again to verify whether misfiring occurs at the same position
(fixed nozzle). If misfiring occurs at a different position, the problem is not related to the Print Head.
・ Check the Ink inside the Ink Cartridge if it remains enough for operation. Ink Sensor Failure may not
sense "Ink Empty" although the Ink Cartridge is really empty. Or ink bag inside the Ink Cartridge may be
bent.
・ Sometimes after a long leave (especially no Wash Liquid inside the Waste Ink Tube) waste ink may be
clogged inside the Maintenance Unit and no ink may flow in Head Cleaning. Check the Caps just after the
Head Cleaning if there is ink remained in the cap or not. If not, clean the Waste Ink Tubes of Maintenance
Unit. Refer to "6-1-16. Assembling / Disassembling of the Maintenance Unit" and "6-1-19. Pump Tube".
・ The following check items are not related to misfiring on Print Heads other than the problematic Print
Head being investigated.
・ The print condition may become faint at both edges if the GT-3 is installed in an extremely dry
location. Refer to "4-1-3. Faded Print by Dryness (Changing the Wipe Frequency)".
・ Check if the Carriage moving area and the surroundings of the Print Head are dirty. The Print Head
Nozzle surface is extremely delicate, and therefore contact between the Print Head and frayed thread
on the black Flushing Plate or Platen Sheet, or waste thread or dust around the Print Head Caps may
result in misfiring. Refer to "5-1-1. Cleaning the Print Head Caps and Wiper Blades" and "5-1-2.
Cleaning the Print Head Nozzle".
・ The following problems cannot be checked by referring to these check flows:
・ PCB defects
・ Clogging in Maintenance Pump Tube, Suction Tube, or Branch Plugs
・ "FFC" in the following diagrams refers to Flat Cables and "PH" refers to Print Heads.
4. Solving Print Quality Problems
GT-3 Series
91