Sharp SF-2040 - Correcting the Longitudinal Distortion

(Lens value input vs. test command input)
(7) Correcting the Longitudinal Distortion
Use this procedure when replacing the mirror base driving wire.
1 Set an A3-size or 11" x 17" blank paper on the original table
while applying the paper end to the glass retaining plate and
aligning the paper side edge with the front frame, as shown in
the right figure.
2 Use an A3-size or 11" x 17" copy paper to take a full-size copy
with the original cover opened.
3 Measure the width of solid at front and rear ends of the copy
paper.
Lb
La
CopyOriginal
Feeding direction
Glass retaining plate
Apply paper front end
to glass retaining plate
Align paper side edge
with front frame
A3-size or 11" x 17" blank paper
Lens display value Correction reference value
Lens display
value
Oi
Oi OL
No. 4/5 mirror
focus adjustment
(45MB)
48-01
Vertical
magnification ratio
adjustment
48-01- ➡
Lens
characteristics
input value
26-08
No. 4/5 mirror
characteristics
input value
26-09
–2.5 ~ 2.4
–1.3 ~ 1.2
54
46
8 –2.8 ~ 1.9
–2.7 ~ 2.6 55
–2.9 ~ 2.8
–1.5 ~ 1.4
56
47
–3.1 ~ 3.0 57
–3.3 ~ 3.2
–1.7 ~ 1.6
58
48
7 –3.6 ~ 2.7
–3.5 ~ 3.4 59
–3.7 ~ 3.6
–1.9 ~ 1.8
60
49
–3.9 ~ 3.8 61
–4.1 ~ 4.0
–2.1 ~ 2.0
62
50
6 –4.4 ~ 3.5
–4.3 ~ 4.2 63
–4.5 ~ 4.4
–2.3 ~ 2.2
64
51
–4.7 ~ 4.6 65
–4.9 ~ 4.8
–2.5 ~ 2.4
66
52
5 –5.2 ~ 4.3
–5.1 ~ 5.0 67
–5.3 ~ 5.2
–2.7 ~ 2.6
68
53
–5.5 ~ 5.4 69
–5.7 ~ 5.6
–2.9 ~ 2.8
70
54
4 –6.0 ~ 5.1
–5.9 ~ 5.8 71
–6.1 ~ 6.0
–3.1 ~ 3.0
72
55
–6.3 ~ 6.2 73
–6.5 ~ 6.4
–3.3 ~ 3.2
74
56
3 –6.8 ~ 5.9
–6.7 ~ 6.6 75
–6.9 ~ 6.8
–3.5 ~ 3.4
76
57
–7.1 ~ 7.0 77
–7.3 ~ 7.2
–3.7 ~ 3.6
78
58
2 –7.6 ~ 6.7
–7.5 ~ 7.4 79
–7.7 ~ 7.6
–3.9 ~ 3.8
80
59
–7.9 ~ 7.8 81
–8.0 –4.0 82 60 1 –7.85 ~ 7.5
7 – 12