IBM 1627 Manual page 11

2. Remove the pen assembly from the carriage.
3. Slide the graph paper sheet under the car-
riage rods and on to the drum surface.
4. Fasten the top edge of the paper to the drum
with two or three short pieces of tape.
Rotate the drum by hand keeping the paper
smooth and flat against the drum surface.
Fasten the bottom edge of the paper in the
same manner as the top.
Operational Checkout
The following procedure provides an over-all check
of the operation of the recorder prior to the start of
automatic recording. If a malfunction is encountered
at any point in the checkout procedure, refer to the
1627 Trouble Shooting Guide in Section 2.
1. Install fine line graph paper (1/100") on
plotter then install pen assembly in its
carriage.
2. Set Power and Chart Drive switches to ON.
3. Set Drum Fast Run to up position. Check
that pen traces a vertical line on graph.
4. Turn Pen switch to down, then up. Check
that pen lifts off drum surface.
5. Set Pen switch to down, then set Drum Fast
Run to down. Check that pen again traces a
vertical line on graph.
6. Set Carriage Fast Run switch to left position.
Check that pen traces a horizontal line on
graph and that carriage step motor stops
when carriage reaches its limit of travel.
Repeat with Carriage Fast Run switch in
right-hand position.
7. Alternately operate Carriage Single Step and
Drum Single Step switches. Check that both
carriage and drum move only one step each
time one of the switches is operated. Check
that both horizontal and vertical steps are
equal to the distance between fine lines on
graph paper (1/100").
8. Move carriage near left margin of graph
paper. Set Carriage Fast Run switch to
right position and Drum Fast Run to down.
position. Allow instrument to run until
carriage reaches right side of track, then
turn both switches to OFF (center) position.
Check that pen traces a 45° line on graph.
Check the line carefully for any evidence of
discontinuity .
9. Operate Drum Single Step switch several
times to reposition pen either above or
below its position at the end of Step 8.
10. Set Carriage Fast Run switch to left position.
Allow instrument to run until carriage
1.6
reaches left side of track, then return both
switches to the off position. Check that pen
again traces a 45° line on graph, and that
this line is exactly parallel to the line
traced in Step 8.
11. Repeat Steps 8 through 10 changing switch
positions to produce two 45° lines at right
angles to the first two. Again check for
discontinuities and make certain the two
lines are parallel.
Reticle Adjustment
Two alignment reticles are provided to permit man-
ual alignment of the carriage to the desired zero
point on the graph (Figure 1-6). Either reticle may
be used by the operator to perform the adjustment.
The A reticle in Figure 1-6 is placed in the
reticle receptacle as shown. It need not be removed
during plotter operation. The B reticle is inserted
in the hole in the carriage that is used by the pen
assembly. It therefore, must be replaced by the
pen assembly during plotter operation.
Once the reticle to be used is installed in its
receptacle, rotate the reticle until the crosshairs are
parallel with the horizontal and vertical planes of the
plotter. Position the carriage and drum to the ap-
proximate desired zero point using the Fast Run
controls. (If the A reticle is used, the intersection
of the crosshairs is exactly one inch in the plus X
direction from the pen point.) Use the Single Step
controls to accurately position the crosshairs on the
zero-plot point.
"A" Reticle
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Figure 1-6. Reticle Adjustment