Checking Input And Output; Input And Output Checking Method; Input And Output Check List - Brother Z-8550A Service Manual

3. FUNCTION SETTINGS

3-6. Checking input and output

Use this to check for any malfunctions of the operation panel keys, circuit boards or sensors, and for checking for broken
cords and for adjusting sensor positions.
You can check whether the CPU is correctly reading the signals from keys and sensors.

3-6-1. Input and output checking method

1
While holding down the TEST key on the operation panel, turn on the power switch (1).
* After the following display appears, keep the TEST key pressed down until the buzzer makes a short beep.
2
Check the responses from the keys and sensors while referring to "3-6-2. Input and output check list".
3
To return to normal operation mode, turn the power switch off and then turn it back on again.

3-6-2. Input and output check list

Needle position, zigzag position and switch operation
Operation block
Needle Needle up signal - ON
position
signal
Needle down signal - ON
Z phase signal - ON
Needle
zigzag
position
A phase signal - ON
signal
B phase signal - ON
Actuator switch - ON
Machine head tilt detection
Switch
Switch - ON
Knee switch - ON
19
Operation panel
indicator block
Needle up signal ON/OFF position for upper shaft motor;
Needle up icon
Turn the pulley by hand.
Needle down signal ON/OFF position for upper shaft
Needle down icon
motor; Turn the pulley by hand.
Home position signal ON/OFF position for needle zigzag
Zigzag motor
width/reference Signal should turn ON/OFF near the needle bar center
line LED position when the needle bar is turned by hand to the left
and right.
A phase ON/OFF position for needle zigzag motor
Left stop LED Signal should turn ON/OFF when the needle bar is turned
by hand to the left and right.
B phase signal ON/OFF position for needle zigzag motor
Signal should turn ON/OFF when the needle bar is turned
Right stop LED
by hand to the left and right.
Correction stitch Correction stitch icon should turn ON when the actuator
icon switch is pressed.
When the machine head is tilted back, the TEST icon
TEST icon
turns ON.
When the knee switch is pressed, the slow start icon
Slow start icon
turns ON.
Z-8550A, 8560A
Check item and checking method
0176B