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4.14 Remaining thread monitor
The remaining thread monitor together with the infrared reflected light
barriers (1) and (2) monitors the left and the right bobbin.
Fig. 25: Remaining thread monitor
(1) - Light barrier 1
(2) - Light barrier 2
To operate the remaining thread monitor:
• When the bobbin is empty, the light beam transmitted by the light
• If the remaining thread monitor is switched on, the control panel
• The pocket opening is safely finished with the remaining thread in the
Cleaning the remaining thread monitor
To clean the remaining thread monitor:
1. Switch off the machine.
2. Clean the lenses of the light barriers with a soft cloth every time you
3. Wind the bobbin.
4. Switch on the machine.
5. Start a new sewing process.
38
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barrier (1) or (2) is reflected by the exposed reflecting surface (3) of
the bobbin hub.
displays the message: Error 3220
reserve groove of the bobbin hub. The transport carriage stops at its
rear end position. It cannot be started again until the bobbin has been
changed.
CAUTION
Risk of injury from sharp and moving parts!
Puncture or crushing possible.
Do not clean the lenses of the light barriers unless
the machine is switched off.
change the bobbin.
(3) - Reflecting surface
.
Operating Instructions 755 B, 756 B/F - 00.0 - 02/2021
Operation
②
③
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