Brother S-7300A - Checking the Motor and Power Supply

S-7300A
10. ELECTRIC MECHANISM
171
10-4. Checking the motor and power supply
CAUTION
Turn off the power switch and disconnect the power cord from the wall outlet before carrying out these operations.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
If the power switch needs to be left on when carrying out some adjustment, be extremely careful to observe all
safety precautions.
<Sewing machine motor>
1. Disconnect the sewing machine motor connector 4P (1)
from the control box.
2. Measure the resistance of the sewing machine motor
connector (1) using an ohmmeter in the x 1 range.
If the value is as shown in the table below, the connector
is normal.
Between 2 - 3
Approx.3.0Ω
Between 3 - 4
Between 4 - 2
<Feed motor>
1. Disconnect the feed motor connector 6P (2) from the
control box.
2. Measure the resistance of the feed motor connector (2)
using an ohmmeter in the x 1 range.
If the value is as shown in the table below, the connector
is normal.
Between 2 - 3
Approx.2.6Ω
Between 5 - 6
1072D
1073D