Brother Z-8550A Service Manual page 107

Cause
5. When [Err 91] is displayed:
Problem with treadle unit settings
6. When [Err 450] is displayed:
Problem with machine head
memory data; Model selection
cannot be loaded
7. When [Err 452] is displayed:
Machine head memory cannot be
verified.
8. When [Err 403] is displayed:
Poor connection between main
P.C. board and PMD P.C. board
9. When [Err 401] or [Err 411] is
displayed:
Main P.C. board communication
error
10. When [Err 700] is displayed:
Abnormal rise in power supply
voltage
11. When [Err 705] is displayed:
Abnormal drop in power supply
voltage
12. When [Err 101] is displayed:
DIP switch No. 4 on the main P.C.
board is ON
13. When [Err 200] is displayed:
Needle zigzag motor is not
connected
14. When [Err 131] is displayed:
Encoder cord of sewing machine
motor is not connected.
Problem No. 3
"UP" is displayed when the power switch is turned on.
Cause
Malfunction of encoder P.C. board in
sewing machine motor
Inspection/Remedy/Adjustment
Repeat the standard settings for the treadle
unit. (Refer to "12-3. Standard settings for
treadle depression stroke".)
(Replace the part(s) indicated at right.)
Check that connector P6 (HEAD-M) is inserted
into the main P.C. board.
1) Check that connector P31 (PMD) is inserted
into the main P.C. board and that connector
P1 (MAIN) is inserted into the PMD P.C.
board.
2) Check if there is a harness short-circuit.
Turn the power switch off and back on again.
Check that the power supply voltage at the wall
outlet is within the range of the specification
voltage +/- 10%.
Check that the power supply voltage at the wall
outlet is within the range of the specification
voltage +/- 10%.
Set DIP switch No. 4 to OFF and then turn the
power switch off and back on.
Check that connector P5 (PMD) is inserted into
the PMD P.C. board.
Check that connector P13 (ENC) is inserted
into the main P.C. board.
Inspection/Remedy/Adjustment
1) Turn the pulley to move the needle bar to
the needle up stop position.
2) Check if the needle up signal remains on.
Z-8550A, 8560A
11. ELECTRICAL MECHANISM
Replacement if a malfunction
-
Machine head memory unit
Machine head memory unit
Harness, PMD P.C. board,
main P.C. board
Harness
Main P.C. board
-
-
-
Needle zigzag motor or PMD
P.C. board
Sewing machine motor or main
P.C. board
Replacement if a malfunction
Encoder P.C. board in sewing
machine motor
98