Brother S-7780A Instruction Manual page 78

7. TROUBLESHOOTING
Problem
21 Nothing appears on the
operation panel display.
22 The illumination becomes
momentarily darker
flickers.
69
・ Is the power supply connector
disconnected from the control
box?
Insert the
securely.
・ Is the operation
connector inside the control
box disconnected?
Insert the
securely.
・ The illumination may become momentarily darker or flicker when the
or
sewing machine starts or stops, depending on the power supply in
the environment where the sewing machine is being used. This is not
a sign of a malfunction.
Possible cause
connectors
panel
connectors
S-7780A
Page
1452D
7・9・10
7
1453D
*