Does Not Operate When The Foot Controller Is Used - Brother NV-10A Service Manual

Failure Investigation for Electronic Parts Does not operate when the foot controller is used
Does not operate when the foot controller is
used.
Is the connector of the FC jack assy.
correctly connected to CN3 of the
main PCB assy.?
Is the resistance between the FC jack
assy. connector pins 2 & 3 normal?
• Foot controller disconnected ... 1 Ω
or less
• Foot controller connected ...... ∞
Is the resistance between pin1 of the
FC jack assy. connector and
cylindrical sleeve (metallic part) of the
FC jack assy. body 1 Ω or less
Is the resistance between foot controller's pin plug terminals normal?
Assume the root of the pinplug to be a plus pole, assume the point of the
pinplug to be a minus pole, and measure the resistance between those.
■ Foot controller model P
• When the pedal is stepped in the maximum ... 8 kΩ – 13.8 kΩ
• When the pedal is not stepped ... 1 Ω or less
■ Foot controller model T, S
• When the pedal is stepped in the maximum ... 0.9 kΩ – 1.2 kΩ
• When the pedal is not stepped ... 33 kΩ – 73 kΩ
Y
Y
Y
Replace the main PCB assy.
N
Reconnect it correctly
N
Replace the FC jack assy.
N
Replace the FC jack assy.
N
Replace the foot controller
5 - 13