Pfaff 4874 User Manual

Defective connection at the connector on the LCD
P.C.B.
Gearing between Step motor’s pinion gear and
middle gear is out of mesh.(tight)
Same as Cause of failure and Measure for S.L. Sensor P.C.B.
Failure of DECO Step motor.
Measure
Lead wire from Step motor.
Defective connection at the connector on the LCD
P.C.B
Loosing of set screws for miter gear.
Failure of DECO Step motor.
Lead wire cut off. (burn out) Replacing lead wire and or DECO Sensor.
Replacing DECO Sensor.
Refer. to Manual Part.1
Connecting the connector properly.
Preplacing DECO Step motor and or lead wirte.
Replacing DECO Step motor.
Decreasing the tension of D.F. spring.
Adjusting setting position of D.F. Unit.
Adjusting the setting position of Step motor.
Tension of D.F. spring is strong.(Page 17 Fig.1-S)
Gearing between middle gear and D.F. gear is out
of mesh. (tight)
Lead wire of Step motor for D.F. cut off (burn out)
Failure of Step motor for D.F.
Replacing Step motor for D.F.
Replacing lead wire and or Step motor for D.F.
Connect repeatedly with connectors.
Failure of DECO Step motor.
Lead wire of Step motor for D.F. cut off. (burn out)
Defective connection at the connector on the LCD
P.C.B. and at the connectors from other compo-
nents.
Failure of sensor.
Lead wire cut off.
Defective connection at the connector on the LCD
P.C.B
Replacing the Step motor.
Replacing the lead wire and or the Step motor.
Connect repeatedly with connectors.
Replacing a P.C.B of sensor.
Replacing lead wire and or a P.C.B of sensor.
Connect repeatedly with connector.
Cause of failure
Lead wire of Step motor cut off. (burn out)
Defective connection at the connector on the LCD
P.C.B.
Gearing between Step motor pinion gear and mid-
dle gear (Fig.1-C) is out of mesh. (may be tight)
Gearing between middle gear(Fig 1-C) and Feed
regulator gear (Fig.1-B) is out of mesh. (may be
tight)
Replacing the Step motor.
Connect repeatedly with connector.
Adjust its gearing properly with moving set position.
Adjust set position of S.L. regulating unit, so that it may
secure proper gearing. (Two set screws for SL Unit must be
loosen. Fig.2-D)
Replacing S.L. Sensor P.C.B
Replacing S.L. Sensor P.C.B
Connect repeatedly with connector.
Replacing lead wire and or the Step motor.
Defective connection at the connector on the LCD
P.C.B
Lead wire cut off. (burn out)
Failure of S.L. Sensor.
Failure of Step motor.
ERROR CODE F2

Pfaff 4874 Specifications

General

Brand	Pfaff
Model	4874
Category	Sewing Machine
Language	English