Teledyne 4220 installation and operation guide Ink Ribbon, Replacement, To replace the ribbon

4220 Flow Meter

Section 6 Maintenance and Service

Figure 6-5 Changing the Ink Ribbon

6.4.2 Ink Ribbon	Ribbon life will vary greatly from one installation to another
Replacement	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.

2. If there is paper in the unit, pull out 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.

3. Take hold of one of the spools and rotate it slightly, loosen- ing the ribbon.

4. Hold the detecting lever away from the spool while gently pulling the spool until it comes free from its shaft. Do the same with the other spool.

5. Lift the chart and take-up spool out of the way and remove the ink ribbon from the printer mechanism, noting how it threads through the unit.

6. Thread the new ink ribbon through the printer mecha- nism.

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