Single Shots - IBM 1403 Field Engineering Maintenance Manual

3. Loosen the bypass needle-valve lock screw just
enough to permit adjusting the needle valve.
4. Disengage the detent arm by pressing down in the
notch with a large screwdriver.
5.
Block the forms switches and run the printer pro-
gram.
6. Observe the scope and adjust the bypass needle
valve to obtain the scope trace shown in Figure 58.
Tighten the lockscrew, and recheck the scope pic-
ture and pencil trace (step 7).
7. You can double-check the adjustment by making a
line graph. Figure 58 shows the scope picture and
line graph for the same conditions. A scope trace
indicating light hydraulic bounce and a line graph
of relatively square corners followed by carriage
drift verifies correct bypass adjustment. Observe
that as little as
~
turn from the correct setting for
the bypass needle valve can produce incorrect scope
and line graphs.
Si n9 Ie-Shots
Three different single-shots are used to stop the car-
riage motion after space operations. Single-space
single-shots are used on Models 1, 2, 3, 4, 5, and 6.
Double-space and triple-space single-shots are used on
Models 3, 4, 5, and 6, when used with a system for
which they were originally designed. Refer to Figure
59. Be sure to check the adjustment of the magnetic
Table 1. 1403 Carriage Single - Space Timings in Milliseconds
1403 Printer Model
Modell Model 2 Model 3 Model 4
Model 5
CD
System for which each model was originally
IBM 1401 IBM 1401 IBM 1460 IBM 1401- G IBM 1401-G
designed to operate.
o
Single - Space Single - Shot
4.5 4.5 5.5 5.5 5.5
@
After - Space Print - Delay Single - Shot
16 16 16 16 16
Carriage Interlock Time
21.4 21.4 20.8 22.5 22.5
o
Forms Interlock Single - Shot
10 10 14 14 14
Notes:
CD
These timings are valid only when a particular model printer is used with the system for which it was originally designed.
For other printer -system combinations, refer to the manual for the system for correct timings.
o
The actual setting may vary for optimum carriage operation.
@
The actual setting will be the difference between the carriage - interlock time and the actual setting of the
single -space single -shot.
o
The actual setting will be 1.7 ms ( 1.1 ms on the Model 3) less than the actual setting of the after - space print - delay
single - shot.
Table 2. Miscellaneous Information
Number of Print Positions
100
132
132 100 132
Maximum Printing Speed (LPM) 600 600 1100 465 465
Chain/Train Motor Speed (RPM) 3600 3600 3600 3600 3600
Chain/Train Velocity (IPS) 90.3 90.3 206 67.73 67.73
Time Required for Type to Move .001" 11.1 11.1 5.0 14.8 14.8
( Microseconds)
Setting for Calibration of Print - Timing
20 20 Has no dial 15 15
Dial with Print Density Lever Set at C.
Timing Disk Speed (RPM) 750 750 1714
562.5 562.5
Time of Carriage Start Impulse Print SS - 1 of
Print SS - lof Print SS - 1 of Print SS - 3 of Print SS - 3 of
Print Scan 48 Pri nt Scan 48 Print Scan 46 Print Scan 48 Print Scan 48
Time Required to Print One Line lOOms.
lOOms. 54.54ms. 129ms. 129ms.
(with Single Space)
Timings for the Model 3 with PCS are the same as for the Model 3, except for maximum printing speed, which is 1400 (Ipm) and the time of
carriage start impulse, which is the beginning of PSS - 1 of Print Scan 46, or when printing is finished.
Figure 59. Reference Chart
(mM
1403)
Model 6
IBM 1401- G
5.5
29
34.5
27
120
340
1800
51.93
19.25
11
431.25
Print SS - 3 of
Print Scan 48
176.5ms.
65