Brother International S-7200B Service Manual - Page 62

Checking the solenoids, <Machine head&gt, <Solenoid-type presser lifter connector&gt

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10. CONTROL BOX AND MOTOR 10-5. Checking the solenoids DANGER Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the face plate of the control box. Touching areas where high voltages are present can result in severe injury. Control box 0743B Sewing machine connector 14P Thread trimmer solenoid Thread wiper solenoid Quick reverse solenoid Actuator switch Safety switch 1886M 1. Disconnect the sewing machine connector 14P (1) from the control circuit board. 2. Measure the resistance of the sewing machine connector (1) using an ohmmeter in the x 1 range. If the values are as shown in the table below, the connector is normal. Between 3-10 Between 4-11 Between 5-12 Between 6-13 Between 7-14 Thread trimming solenoid: Approx. 7.6Ω Thread wiper solenoid: Approx. 5.7Ω Quick reverse solenoid: Approx. 4.8Ω When actuator is pressed: 0Ω When actuator is released: ∞ Ω When machine head is upright (switch ON): 0 Ω When machine head is tilted back (switch OFF): ∞ Ω Solenoid-type presser lifter connector 6P Knee switch Presser lifter solenoid 2331M 1. Disconnect the solenoid-type presser lifter connector 6P (2) from the control circuit board. 2. Measure the resistance of the solenoid-type presser lifter connector (2) using an ohmmeter in the x 1 range. If the values are as shown in the table below, the connector is normal. Between 3-6 Between 4-5 Presser lifter solenoid: Approx. 9.6 Ω When knee switch is pressed: 0 Ω When knee switch is released: ∞ Ω 55 S-7200B

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S-7200B
10. CONTROL BOX AND MOTOR
55
10-5. Checking the solenoids
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the face plate of the control box. Touching areas where high voltages are present can result in
severe injury.
<Machine head>
1. Disconnect the sewing machine connector 14P (1) from
the control circuit board.
2. Measure the resistance of the sewing machine connector
(1) using an ohmmeter in the x 1 range.
If the values are as shown in the table below, the
connector is normal.
Between 3–10
Thread trimming solenoid: Approx.
7.6
Ω
Between 4–11
Thread wiper solenoid: Approx. 5.7
Ω
Between 5–12
Quick reverse solenoid: Approx. 4.8
Ω
When actuator is pressed: 0
Ω
Between 6–13
When actuator is released:
∞
Ω
When machine head is upright (switch
ON): 0
Ω
Between 7–14
When machine head is tilted back
(switch OFF):
∞
Ω
<Solenoid-type presser lifter connector>
1. Disconnect the solenoid-type presser lifter connector 6P
(2) from the control circuit board.
2. Measure the resistance of the solenoid-type presser lifter
connector (2) using an ohmmeter in the x 1 range.
If the values are as shown in the table below, the
connector is normal.
Between 3–6
Presser lifter solenoid: Approx. 9.6
Ω
When knee switch is pressed: 0
Ω
Between 4–5
When knee switch is released:
∞
Ω
Sewing machine connector 14P
Solenoid-type presser lifter connector 6P
0743B
1886M
Thread trimmer solenoid
Thread wiper solenoid
Quick reverse solenoid
Actuator switch
Safety switch
2331M
Knee switch
Presser lifter solenoid
Control box