Brother BE-438HS, Service Manual

Page: 210 / 223

14. ELECTRIC MECHANISM
199 KE-430HX/KE-430HS, BE-438HX/BE-438HS
Error status #3 Error code appears on the display when the power is turned on.
Probable causes Check/ repair/ adjust Parts to be replaced
1. If “E025” or “E035” is displayed,
the foot switch is still depressed.
a. Check if the foot switch is still depressed.
b. Check if there is a short-circuit in the harness.
c. Check if connector P8 (PEDAL) is connected
to the main PCB.
d. Reset the depression stroke for the foot switch
while referring to “9-22. Setting method for
standard depression strokes (Foot switch)”.
* For a 2-pedal foot switch, the connector for
the main PCB will be P10 (FOOT).
Treadle unit
2-pedal foot switch assembly
2. If "E055" is displayed, there is a
malfunction of the machine head
switch.
a. Check if the machine head switch is off.
b. Check if there is a broken wire in the harness.
c. Check if connector P9 (HEAD-SW) is
connected to the main PCB.
Switch assembly machine
head
3. If "E065" is displayed, one of the
keys on the operation panel is still
depressed.
a. Check that there is no incorrect sensitivity
when the surface of the panel sheet and the
keys are pressed.
b. Check that connector P5 (PANEL) is
connected to the main PCB, and that
connector P1 is connected to the panel main
PCB.
c. Check that CN2 is inserted into the panel main
PCB.
Operation panel assembly
4. If “E131” is displayed, there is a
poor connection of the
synchronizer.
Check that connector P5 (ENC-MT) is connected
to the power supply motor PCB, and that
connector P23 (MOTOR) is connected to the
main PCB.
5. If "E400" or "E401" is displayed,
there is a connection fault
between the main PCB and the
power supply motor PCB or
between the main PCB and the
panel main PCB.
a. Check LD3 (green) on the main PCB.
OK if illuminated.
b. Check LD3 (green) on the power supply motor
PCB.
OK if illuminated.
c. Check that connector P23 (MOTOR) is
connected to the main PCB, and that
connector P4 (MN-MT) is connected to the
power supply motor PCB.
d. Check that connector P5 (PANEL) is
connected to the main PCB, and that
connector P1 is connected to the panel main
PCB.
e. Check if there is a broken wire in the harness.
Main PCB assembly
Power supply motor PCB
assembly
Operation panel assembly
6. If "E450" or "E452" is displayed,
the machine head memory cannot
be recognized.
a. Check if connector P4 (HEAD-MEM) is
connected to the main PCB.
b. Check if there is a broken wire in the harness.
7. If "E700" is displayed, the power
supply voltage is abnormally high.
a. Check that the power supply voltage at the
mains is at the specification v/-10%.
b. See #1-2.
8. If "E705" is displayed, the power
supply voltage is abnormally low.
a. Check that the power supply voltage at the
mains is at the specification v/- 10%.
b. See #1-2.