Brother T-8421D Instruction Manual page 106

Problem
Nothing appears on the
operation panel display.
The panel display switches
to the grease-up warning
screen when the power
switch is turned on.
The illumination becomes
momentarily darker or
flickers.
Possible cause
• Is the 8-pin operation panel connector inside the
control box disconnected?
Insert the connectors securely.
• This display is to notify you that it is time to apply
grease.
Apply grease.
• The illumination may become momentarily darker or
flicker when the 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.
Page
See Connecting the cords
on page 10.
1
See Adding grease (when
the grease up warning
screen is displayed) on
page 70.
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