4210 Flow Meter
Section 5 Maintenance and Service
5-5
9. Line up the slots in the cardboard tube with the raised
guides on the spool.
10. Reattach the white end cap by wedging the two catches on
the end of the spool into the two slots on the white end cap.
11. Peel the paper back gently so it will unroll freely. Using the
knife or scissors, cut off the end of the roll if it is torn.
12. Fold the paper over on itself so the end is straight and
stiffer than a single layer of paper would be.
13. Unroll a few inches of the paper and set the roll on top of
the cabinet.
14. Use your fingers to feed the paper down the back of the
internal printer to where it touches the roller. Make sure
the paper gets past the lever for the paper sensing switch.
15. Press the Chart Advance key and hold it until the paper
comes through the printer mechanism.
16. When the paper comes through, reinstall the feed spool
with the new roll on it by snapping it into the printer
assembly.
17. Run a few inches through the printer, using the Chart
Advance key; then unfold the end.
18. Put the cardboard tube from the empty roll on the take-up
spindle and reattach the white end cap by wedging the
catches on the end of the spool into the two slots on the
white end cap.
19. Use the piece of tape to attach the end of the new paper to
the cardboard tube from the old roll.
20. Roll some of the paper onto the spool so that it will wind
clockwise, facing away from you. Then reinstall the
take-up roll into the top of the printer. Be careful to push it
all the way back in, so that the take-up gear on the end of
the spool assembly will reengage.
21. When the take-up spool is back in place, again push the
Chart Reroll key; this will remove any slackness in the
paper.
5.2.2 Ink Ribbon
Replacement
Ribbon life will vary greatly from one installation to another
depending on how often the printer has to print. When the char-
acters on the chart become difficult to read, you should replace
the ribbon. If possible, try to replace the ribbon at the same time
you change the paper roll, as it is easier to replace the ribbon
when the roll of paper is out of the way.
To replace the ribbon:
1. Turn the unit off.
If there is paper in the unit, remove the take-up spool and
unroll enough paper to get it out of the way, so you can
clearly see the two ribbon spools. Each spool has a rib-
bon-detecting lever pressing against the ribbon. Note the
direction the ribbon leaves the left spool and how it winds
onto the right spool.
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