Brother RH-9820 Service Manual page 213

Thread trimming mechanism
• Gimp solenoid and lower thread solenoid do not operate.
(No error displayed)
Sewing operations
• Power indicator does not illuminate and sewing machine
does not operate.
• Operation is unstable.
• [E403] is displayed when the power is turned on and the
sewing machine does not start.
Trouble symptom
Trouble symptom
Connector No. and position
Connector No. and position
RH-9820
8. ELECTRICAL MECHANISM
0757B
5244Q
4717Q
204