ELNA Elinita EF72 Service Manual page 45

4. Foot control/speed control slider
5. Upper shaft phase sensor
6. Stepping motors
1. Foot control
Correct condition
When the foot control is not
connected: 240 or more
The number changes when the foot
1
control is connected/pressed and
2
released.
2. Speed control slider
Correct condition
At the left end: 00
At the right end: 255
Press the start/stop key to proceed
to the next step.
Correct condition
Turn the handwheel to check the
phase sensor.
In zigzag phase (Bight): "H" Not in
zigzag phase: ""L"
In feed phase (Feed): "H" Not in
feed phase: ""L"
Buzzer sounds when each sensor
changes from "L" to "H" or from "H"
to "L".
Press the start/stop key to proceed
to the next step.
Correct condition
Turn the handwheel to move the
needle bar to the zigzag phase (up
position). When pressing the needle
up/down key, the buzzer sounds and
the zigzag motor is for the middle
needle position.
Turn the handwheel to move the
needle bar to the feed phase (down
position). When pressing the needle
up/down key, the buzzer sounds and
the feed motor is for no feed.
Press the start/stop key to proceed
to the next step.
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Faulty condition
The number is less than 240.
The screen does not change.
To replace:
Foot control
Machine socket (unit)
Printed circuit board A
Faulty condition
The number is not 00 (at the left
end) or not 255 (at the right end).
The screen does not change.
To replace:
Speed control slider
Printed circuit board A
Faulty condition
Buzzer does not sound when the
screen changes.
The screen does not change.
To adjust or replace a part:
Adjust the position of the upper
shaft shield plate.
Replace the photo sensor.
Change the printed circuit board A.
Faulty condition
The zigzag motor is not for the
middle needle position.
The feed motor is not for no feed.
"E1" is indicated under "Bight".
"E2" is indicated under "Feed".
The caution buzzer sounds when
the motor starts running.
To adjust or replace a part:
Adjust the position of the
sensor.
Replace the zigzag motor.
Replace the feed motor.
Change the printed circuit board A.