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Pfaff
Sewing Machine
4874
Pfaff 4874 User Manual
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REMOVING LCD
PRINTED CIRCUIT BOARD
3a
DT1
DT1
DT2
DT2
DT3
DT4
DT5
DT5
DT4
DT1
DT2
DT3
DT4
DT5
DCM
DT3
SPD
DTS
SLS
DFM
SLM
CN11
DFS
DCS
DCM
DFS
DFM
DTS
DCS
DCSW
DCSW
SLS
SLM
1. Remove: Mains lead
2. Disconnect all connectors from the LCD printed circuit b
o
ard (connectors wired with 8
step motors, sensors, switches and speed reducer etc.)
3. The details of wiring are available from the page 3b and 3c.
21
23
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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