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Sewing Machine
4874
Pfaff 4874 User Manual
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WIRING FOR THE CONNECTORS ON THE LCD CIRCUIT BOARD
3b
Secure respective wiring between each connectors and related
motors and sensors with wire-
harness as shown in the following tables.
SPD
DTS
DCM
DT4
DT5
DT3
DT2
DT1
SLM
DCSW
SLS
DFS
DCS
DFM
Wiring for Sensors
Connectors
Sensors
DTS
From DT Sensor P.C.B.
Page.3a
SLS
From S.L. Sensor P.C.B.
Page.3a
DFS
From D.F. Sensor P.C.B.
Page.3a
DCS
From DECO Sensor P.C.B.
Page.3a
DCSW
From DECO Switch
Page.3a
SPD
From Main P.C.B.
Page.3a
Wiring for Step Motors
Connectors
Step Motors
DT1
F
rom
DT1 Step Motor
Page.3a
DT2
F
rom
DT2 Step Motor
Page.3a
DT3
F
rom
DT3 Step Motor
Page.3a
DT4
F
rom
DT4 Step Motor
Page.3a
DT5
F
rom
DT5 Step Motor
Page.3a
DCM
F
rom
DECO Step Motor
Page.3a
DFM
F
rom
D.F. Step Motor
Page.3a
SLM
From S.L. Step Motor
Page.3a
22
24
Table of Contents
Table of Contents
2
General Directions and Recommendations
4
C.1-2. Mechanical Sewing Disorders
6
G.1-3. Gauge for the after - Sales Service
16
Removing Back Cover
20
Removing Front Cover
21
A-B. Height and Alignment of Cloth Presser Bar
30
Height-Clearance-Angular Position of Lower Looper
34
Clearance of Needle Guards
35
A-B. Timing of Lower Looper
36
Angular Position of Upper Looper
38
Clearance and Timing of Upper Looper to Lower Looper 11
39
Chain Looper Thread Take up Rotary Cam
44
Height of Feed Dog
45
A-B. Moving Cutter and Vertical Feed Timing
46
Adjustment for Differential Feed Unit Operated with Stepping Motor
50
Position of Fixed Cutter and Cutting Width Dial Setting 18
51
Position of Loopers Threads Take up Lever
52
Position of the Stitch Width Finger
53
Lateral and Front Covers Safety Device
54
A-B. Adjustment of Setting Position for En-Sensor and Slit-Plate
56
Adjustment for Stitch Length Unit Operated with Step Motor
58
Timing Adjustment for Top Cover Triangle Thread Guide and Top Cover Hook
59
Adjustment of Threads Take up Lever for Top Cover and Deco Cover
60
Installing of Deco Unit
61
A-B. Adjustment for Deco Unit
62
Cover Hem Stitch Being Pulled
64
Cover Hem Stitch Formation (Narrow & Wide
68
Triple Cover Hem Stitch Formation
69
4
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Pfaff 4874 Specifications
General
Brand
Pfaff
Model
4874
Category
Sewing Machine
Language
English
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