Brother DP-550CJ, Service Manual

Page: 97 / 194

REPAIR
Troubleshooting
SERVICE MANUAL
3-34
(2) To run Test "4" (all keys in Fig. 3.21, "A")
a) Starting from the top left of the keyboard, press each key in turn (see
sequence below).
b) Then press SHIFT + Z, SHIFT + /, and CODE + SPACE. If there is no problem,
the message "KB TEST OK" will be printed, and the display will return to the
SELF Test menu.
NOTES:
•
After automatic carriage return, "KB TEST OK." prints, and the display returns to the
SELF Test menu.
•
A paper check is performed before printing. If paper is set, the print test is executed; if
no paper is set, the ERROR pop-up window is displayed. If you select to continue
printing, paper is automatically inserted by the ACF and to execute the print test.
•
If the keys are pressed in the wrong sequence, a beep will sound. The test will continue
when the correct key is pressed.
•
At any time during the test, you may cancel by pressing the RETURN key twice to
return to the SELF Test menu.
(3) To run Test "5" (all keys in Fig. 3.21, "B")
a) Press the keys in the sequence indicated below.
b) Then press “
→
". If there is no problem, the message "KB TEST OK" will be
printed, and the display will return to the SELF Test menu.
Test Keys
Sequence
Test Keys
Sequence