i. Pen Mount Drive Cable (Fig. 17)
I
1. Take off instrument case and remove binding-head screw attaching
front end of carrying beam to track mount. NOTE: Be careful not
to damage pen lift spring.
2. Pull pen-lowering relay actuating lever straight up and out of its rest
in track mount.
3. Lift front end of carriage up enough to slide pen mount off its track.
4. Fasten ends of two pieces of cable to holes on each side of pen mount,
and slide pen mount back onto its track.
5. Frontmost cable will be strung first. Insert it through passage in
track mount, drop relay actuating lever back into its rest in track
mount, and reattach carriage beam to track mount, positioning pen
lift spring properly.
6. Connect a rubber band between pen mount and rear pen mount pulley
stud, so that pen mount is at its rearmost position.
7. Rotate pen mount drive sheave fully CCW, looking from the left, so
that the two holes are in front. Then run cable over the sheave and
immediately into the lower hole in sheave. Bring it out of the upper
hole and downward, to the left of itself between the two holes.
8. Loop cable CW (looking from the left) around the sheave, on the right
side of the entering cable, progressing to the right on the sheave,
making three complete turns.
9. Continue about 1/2 turn around and under sheave, passing between the
sheave -stabilizing dollies. Tilt recording table upward for access.
10. Remove rubber band and slide pen mount to front end of carriage beam,
keeping cable pulled taught around sheave. Place a piece of tape around
sheave.
11. Continue cable from sheave under table and hook to spring approximately
2" from rear of table.
8
12. Hold spring in one hand and with the other hand carry other cable from
pen mount under carriage beam and over rear pulley (A). Bring free
end of cable under table and hook to other end of spring. Tighten cable
only enough to prevent lost motion (enough to just begin to feel spring
tension) and fasten.
36 |
ACEC
HEWLETT-PACKARD
