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Troubleshooting / Service
Pen Alignment
Release M
DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual
219
April 2017
9.6 Pen Alignment
Mechanical alignment
CAUTION
Align pens mechanically as shown in Table 9-19 and then electrically as described in Table
9-20. Never attempt to manually force the pen arms from the front, since this will damage the
pen mechanism.
ATTENTION
Be sure the shipping sponge is installed on the pen tip whenever the recorder is moved or
stored.
Table 9-19 Pen 1 (purple) and Pen 2 (red) Mechanical Alignment
Step
Action
1
Refer to Figure 9-1.
ATTENTION: If you only have a one pen recorder, steps for pen 2 (red) do not apply.
2
Turn off power, open the door, and lift the pen lifter up.
3
Unclip and remove the purple and red ink cartridges from pen 1 and 2 arms to provide a better
view of tips of arms.
4
Push the No. 1 pen sector gear down so that its uppermost teeth mesh with teeth on the motor
shaft gear.
5
Push the No. 2 pen sector gear up until it is at the top of the slot in the servo plate.
6
For the 2 Pen Recorder:
Remove the screw and lockwasher holding the No. 1 pen arm to the servo shaft. Slightly
loosen the screw holding the No. 2 pen arm to the servo shaft.
For the 1 Pen Recorder:
Slightly loosen the screw holding the No. 1 pen arm to the servo shaft and skip to Step 8.
7
Move the No. 2 pen arm so that its right tip aligns with the inside circumference of the inner
most circle in the center of the chart. Tighten the screw.
8
Replace the No. 1 pen arm, lockwasher, and screw, but leave the screw slightly loose.
9
Move the No. 1 pen arm so that its right tip aligns with the inside circumference of the inner
most circle in the center of the chart. Tighten screw.