Brother RH-9820 Service Manual page 221

Problem #2 When the power is turned on, an error code is displayed.
Cause
1. If [E025] or [E035] is displayed,
the foot switch is still depressed.
2. If [E055] is displayed, there is a
malfunction of the machine head
safety switch.
3. If [E065] is displayed, one of the
keys on the operation panel is
still depressed.
4. If [E110] is displayed, there is a
malfunction of the needle up
signal.
5. If [E403] is displayed, there is a
poor connection between the
main P.C. board and the PMD
P.C. board.
6. If [E401] is displayed, there is a
poor connection between the
main P.C. board and the power
supply motor P.C. board.
7. If [E450] is displayed, the
machine head memory cannot
be verified.
8. If [E700] is displayed, there is
an abnormal rise in the power
supply voltage.
9. If [E705] is displayed, there is
an abnormal drop in the power
supply voltage.
10. If [E740] is displayed, there is a
malfunction of the cooling fan.
Inspection/Remedy/Adjustment
1) Check if the foot switch is still depressed.
2) Check that the setting for memory switch No.
050 is correct while referring to "2-3. Memory
switch setting method (Advanced)".
3) Check if there is a harness short-circuit.
4) Check that connector P6 (FOOT) is inserted
into the main P.C. board.
5) Check the switch input while referring to "2-6.
Input checking method".
1) Check that the machine head safety switch is
OFF.
2) Check that connector P9 (HEAD-SW) is
inserted into the main P.C. board.
3) Check if there is a harness short-circuit.
4) Check the machine head safety switch input
while referring to "2-6. Input checking
method".
1) Check that connector P1 (PANEL) is
inserted into the main P.C. board, and that
connector CN5 (MAIN) is inserted into the
panel P.C. board.
2) Check the key input while referring to "2-6.
Input checking method".
1) Turn the upper shaft pulley to move the
needle bar to the needle up stop position.
2) Check that connector
connected to the power supply motor P.C.
board and that
connected.
3) Check the zigzag sensor and needle up
signal input while referring to "2-6. Input
checking method".
1) Check that connector P1 (MAIN) is inserted
into the PMD P.C. board.
2) Check if there is a harness short-circuit.
1) Check that connector P17 (M-MOTOR) is
inserted into the main P.C. board, and that
connector P6 (MAIN) is inserted into the
power supply motor P.C. board.
2) Check if there is a harness short-circuit.
1) Check that connector P3 (HEAD-M) is
inserted into the power supply motor P.C.
board.
2) Check if there is a harness short-circuit.
1) Check that the power supply voltage at the
wall outlet is within the range of the
specification voltage +/- 10%.
2) Refer to check items #1-2 and #1-3.
3) Check the power supply voltage while
referring to "2-6. Input checking method".
1) Check that the power supply voltage at the
wall outlet is within the range of the
specification voltage +/- 10%.
2) Refer to check items #1-2 and #1-3.
3) Check the power supply voltage while
referring to "2-6. Input checking method".
1) Check if there are any thread scraps blocking
the cooling fan.
2) Check that connector P8 (SENSOR1) is
inserted into the main P.C. board.
3) Check the fan signal input while referring to
"2-6. Input checking method".
RH-9820
P5 (SYNC) is
the synchronizer is
8. ELECTRICAL MECHANISM
Replacement if a malfunction
Treadle unit
2-pedal foot switch
Machine head safety switch
Panel P.C. board
Panel harness
Main P.C. board
PMD P.C. board
Harness
Power supply motor P.C.
board
Main P.C. board
Machine head memory
Fan motor assembly
212