Bernina 750 QE, User Manual

Page: 168 / 198

167
Troubleshooting
Fault Cause Repair
Sewing-/
Embroidery
computer
Upper thread
indicator does not
respond
Lower thread
indicator does not
respond
Update error
̶ Sewing computer fails to run or runs slowly
̶ Turn power switch to «0» (off)
̶ Not activated in the Setup Program
̶ Not activated in the Setup Program
̶ USB stick is not recognized
̶ Update process is blocked (hourglass
stays on Display)
̶ Update-data aren't identified
⦁ check the setting in the Setup Program
⦁ alter the speed control
⦁ place the sewing computer in a warm room one hour before use
⦁ turn the power switch to «I» (on)
⦁
take the sewing computer to the nearest authorized
BERNINA dealer
⦁ activate in the Setup Program
⦁ activate in the Setup Program
⦁ use a BERNINA USB stick
⦁ remove the stick and turn the sewing computer off and on
again. Proceed with the update as indicated by the message
⦁ don't save update-data in a folder
⦁ unzip update-data
Display is inactive ̶ Calibration data incorrect
̶ ECO-function active
⦁ re-calibrate the Display in the Setup Program
⦁
turn off ECO function
Stitch width not
adjustable
̶ Setting activated in the security
program
⦁ deactivate setting
Lower thread
indicator reacts
̶ Thread used/broken ⦁ wind thread and thread
Sewing-/
Embroidery
computer
̶ Deleting or overwriting data, e.g.
drawers
̶ Stitch number not known in direct entry
̶ Stitch selection not possible in the
combination mode
⦁ confirm with or cancel with
⦁
check command entered and enter a new number
⦁
make another selection
General Explanation Repair
Messages
Needle breaks ̶ Needle not correctly inserted
̶ Fabric was pulled
̶ Fabric was pushed when using thick
material
̶ Poor-quality thread, unevenly wound or
knotted
⦁ tighten the needle clamp screw
⦁ do not pull the fabric during sewing
⦁
use the correct presser foot for thick material (e.g. Jeans foot
No. 8) use height compensating tool when sewing over a
thick seam
⦁ use quality thread (Isacord, Mettler, Gütermann etc.)
⦁
always remove the hook after a needle breakage and check
the magnetic back of the hook for broken off needle parts
LED sewing light
do not light up
̶ LED defective
̶ Deactivated in the Setup-Program
⦁
take the sewing-/embroidery computer to the nearest
authorized BERNINA dealer
⦁ activate in the Setup Program
034247.71.04_2014-02_Manual_B750_EN