Brother GTX-4 - Page 119

4-22
Improvement of print quality
(2) After checking the wiring of carriage circuit board through main circuit board, is such failure
cleared?
(1) In the case that the power is turned on, press the power switch to turn off the power.
(2) With reference to "6-2-19. Replacement of carriage circuit board", check to see if the connector of the carriage
circuit board is disconnected.
<IMPORTANT>
 Check to see if the circuit board is slanted or it is floated.
(3) With reference to "6-2-4. Replacement of main circuit board", check to see if the FFC of the carriage circuit board is
disconnected to the main board.
<IMPORTANT>
 Check to see if the FFC is slanted or it is poorly inserted.
 Check to see if the lock (black portion) is securely hooked.
(4) Print out a nozzle check pattern to check the result.
 If non-ink ejection nozzle is not found -> OK
* Assembly failure or there is a possibility that it was disconnected after delivery of the product.
 If the state of non-ink ejection nozzle is not changed -> NG
* Failure of carriage circuit board is highly possible.
=> "(3) After replacing the carriage circuit board, is such failure cleared?"
NG example