Brother Z-8550B Instruction Manual page 152

Code
E442 Back up memory (main internal P.C. board) data
was abnormal, so settings were initialized.
E450 Model selections could not be read from machine
head memory (internal panel).
E451 Data backup cannot be written to machine head
memory (internal panel).
E452 Machine head memory is not connected.
E474 Internal memory is full and copying is not
possible.
Software-related errors
Code
E582 A memory switch version updating error was
detected (including specification mismatch).
E583 A parameter version updating error was detected
(including specification mismatch).
P.C. board-related errors
Code
E700 Abnormal rise in power supply voltage was
detected when power was turned on.
E701 Abnormal rise in sewing machine motor power
supply voltage was detected.
E705 Abnormal drop in power supply voltage was
detected.
E709 Power supply signal could not be detected when
power was turned on.
E710 Abnormal sewing machine motor current was
detected.
E711 Abnormal current detected in needle zigzag
motor.
E740 Fan motor does not operate.
E791 Abnormal solenoid mechanism current detected
when solenoid was activated.
Version updating errors
Code
E880 Version update request could not be received
when power was turned on.
E881 Communication error was detected during main
version update.
Cause
Cause
Cause
Cause
Remedy
Turn the power off and then back on again.
Turn off the power and check the connection of
connector P3.
Turn off the power and check the connection of
connector P3.
Turn off the power and check the connection of
connector P3.
Free up some space in the internal memory.
Remedy
Turn the power off and then back on again.
Turn the power off and then back on again.
Remedy
Turn off the power and check the power supply
voltage.
• Turn off the power and check the power
supply voltage.
• Turn off the power and check the connection
of connector P4.
Turn off the power and check the power supply
voltage.
Turn the power off and then back on again.
Turn off the power and check the connections of
the 4-pin sewing machine motor connector.
Turn off the power and check the connections of
the 6-pin zigzag motor connector.
• Turn off the power, and then check if the
cooling fan is blocked with scraps of thread.
• Turn off the power and check the connection
of connectors CN2 and CN3.
Turn off the power and check the connection of
connector CN8.
Remedy
Turn off the power and check the connection of
connector CN6.
Turn off the power and check the connection of
connector CN6.
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