IBM Selectric Maintenance Manual page 139

To scope contact poi nts, put scope probe on poi nt to
be observed and the ground lead in the power supply
common jack on 0 LSA.
0°
27.1
SCOPING MECHANICAL TIMINGS
i-M"h,okol DeloY- .
1
7
Since OLSA magnet pulses are under control of. feed-
back contacts in the Selectric, it is possible to scope
Feedback N/C Contact
the magnet pulses and to calculate how much time is
Seal Time
Timing Converted From
required to perform any mechanical action initiated
Degrees To Milliseconds
by the mag net pu Ise .
Seal time can be observed on the scope. Feedback
timings should be checked with a meter to insure that
Figure
27.0
they are correct according to your machine specifica-
tions. Timings in degrees can be converted to milli-
seconds by referri ng to conversion chart, page 10.
DEGREE TO MILLISECOND CONVERSION CHART
DEGREES TO MILLISECONDS
1 .358 31 11 .098 61 21.838 91 32.578 121 43.318 151 54.058
2
.716
32 11 .456 62 22.196 92 32.936 122 43.676 152 54.416
3 1.074 33 11.814 63 22.554 93 33.294 123 44.034 153 54.774
4
1.432 34 12.172 64 22.912 94
33.652 124 44.392 154 55.132
5 1.790 35 12.530 65 23.270 95 34.010 125 44.750 155 55.490
6
2.148 36 12.888 66 23.628 96 34.368 126 45.108 156 55.848
7 2.506 37 13.246 67 23 :986 97 34.726 127 45.466 157 56.206
8
2.864 38 13.604 68 24.344 98 35.084 128 45.824 158 56.564
9 3.222 39 13.962 69 24.702 99 35.442 129 46.182 159 56.922
10 3.580 40 14.320 70 25.060 100 35.800 130 46.540 160 57.280
11
3.938 41
14.678 71 25.418 101 36.158 131 46.898 161 57.638
12 4.296 42 15.036 72 25.776 102 36.516 132 47.256 162 57.996
13
4.654
43 15.394 73 26.134 103 36.874 133 47.614 163 58.354
14
5.012 44 15.752
74 26.492
104
37.232
134 47.972 164 58.712
15
5.370
45
16.110
75 26.850 105 37.590 135
48.330 165 59.070
16
5.728 46 16.468 76 27.208
106
37.948
136
48.688 166 59.428
17 6.086 47 16.826 77 27.566 107 38.306 137 49.046 167 59.786
18
6.444 48 17.184
78 27.924 108 38.664
138 49.404 168 60.144
19
6.802 49 17.542 79 28.282
109
39.022 139 49.762 169 60.502
20 7.160 50 17.900 80 28.640 110 39.380 140 50.120 170 60.860
21 7.518 51 18.258 81 28.998 111 39.738 141 50.478 171 61.218
22 7.876 52 18.616 82 29.356 112 40.096 142 50.836 172 61.576
23 8.234 53 18.974 83 29.714 113
40.454
143 51 .194 173 61.934
24 8.592 54 19.332 84 30.072 114 40.812 144 51.552 174 62.292
25
8.950 55 19.690 85
30.430 .
115 41 .170 145 51.910 175 62.650
26
9.308 56 20.048 86 30.788 116 41.528 146 52.268 176 63.008
27 9.666 57 20.406 87 31.146 117 41.886 147 52.626 177 63.366
28 10.024 58 20.764 88 31 .504 118 42.244 148 52.984 178 63.724
29 10.382 59 21 .122 89 31.862 119 42.602 149 53.342 179 64.082
30 10.740 60 21 .480 90 32.220 120 42.960 150 53.700 180 64.440
CHARACTER RATE VS. CYCLE TIME
13.0 - 76.9 13.5 -74.0
14.0 - 71.4
14.5 ;. 69.0
15.0 - 66.7
13.1 - 76.3 13.6 - 73.5 14.1 - 70.9 14.6 - 68.5 15.1 - 66.2
13.2 - 75.8 13.7 - 73.0 14.2 - 70.4 14.7 - 68.0 15.2 - 65.8
13.3 - 75.2 13.8 - 72.5 14.3 - 69.9 14.8 - 67.5 15.3 - 65.4
13.4 - 74.6 13.9 - 72.0 14.4 - 69.5 14.9 - 67.1 15.4 - 65.0
15.5 - 64.5
Figure
27.1
4-31