Brother RH-9820 Service Manual page 226

8. ELECTRICAL MECHANISM
Problem #11 An error code is displayed after the sewing machine operates.
Cause
1. If [E120] (Needle drop signal
error), [E130] (Upper shaft signal
error) or [E131] (Upper shaft
signal error) is displayed after
the sewing machine operates,
there is a malfunction of the
synchronizer, interference
causing operating problems, or
the sewing machine
incorrectly adjusted.
2. If [E150] is displayed after the
sewing machine operates, the
motor is abnormally overheating.
Problem #12 Upper thread trimming does not operate.
Cause
Malfunction of valve or valve harness
Problem #13 Needle does not stop in the up position. ([E111] is displayed.)
Cause
1. Incorrect adjustment
2. Malfunction of needle up signal
3. Malfunction of zigzag sensor
4. Malfunction of cord
5. Malfunction of power supply
motor P.C. board
6. Malfunction of main P.C. board
7. Malfunction of motor
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Inspection/Remedy/Adjustment
1) Check that connector P5 (SYNC) is inserted
into the power supply motor P.C. board and
that the synchronizer is connected.
2) If the needle drop signal or upper shaft
encoder signal can be confirmed to be
turning on and off while referring to "2-6.
is Input checking method", then they are OK.
3) Turn the pulley by hand and check that it
is turns smoothly.
4) 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.
5) Check the harness between connector P17
(M_MOTOR) of the main P.C. board and
connector P6 (MAIN) of the power supply
motor P.C. board.
6) Check that the ground wire is connected to a
secure ground and that there is no equipment
nearby that is generating strong electrical
interference.
1) Turn off the power and let the sewing
machine stand for 30 minutes or more.
2) Turn the power back on; OK if operation is
normal.
Inspection/Remedy/Adjustment
Check that connector P12 (AIR1) is inserted
into the main P.C. board.
Inspection/Remedy/Adjustment
Adjust while referring to "7-36. Adjusting the
upper shaft stop position".
Check the needle up signal input while referring
to "2-6. Input checking method".
1) Check that connector P10 (SENSOR2) is
inserted into the main P.C. board.
2) Check the zigzag sensor while referring to
"2-6. Input checking method".
Refer to inspection #10.
With connector P2 (POWER2) connected to the
PMD P.C. board, measure the voltage at the cord.
OK if approximately 30 V DC between pins 3-4.
4892Q
RH-9820
Replacement if a malfunction
Motor assembly CCD-9820
Replacement if a malfunction
Valve harness
Replacement if a malfunction
Main P.C. board
Power supply motor
board
Main P.C. board
Motor
P.C.