Motor Balance Procedure
A potentiometer (RV1) is mounted on the printer’s Power Supply Board that will
balance the current traveling to both phases of the stepper motor. Proper balance
of this current is essential in order to achieve optimum print quality and
minimize resonance.
1. Print at 2 inches/sec (Speed A).
2. Turn the potentiometer (RV1) until the printer is at minimum resonance. See
Figure 5.26. This minimum resonance point may be detected by ear or by
placing your hand on the printer. At this point the printer is approximately
balanced, it is now necessary to fine-tune this adjustment.
3. Print the following label format on the printer.
^XA ^PRA ^LHO, 20 ^FS
^F0190, 610 ^GB410, 0, 2 ^FS
^F0190, 615 ^GB410, 0, 2 ^FS
^F0190, 620 ^GB410, 0, 2 ^FS
^F0150, 730 ^GB490, 0, 2 ^FS
^F0150, 735 ^GB490, 0, 2 ^FS
^F0150, 740 ^GB490, 0, 2 ^FS
^F0110, 850 ^GB570, 0, 2 ^FS
^F0110, 855 ^GB570, 0, 2 ^FS
^F0110, 860 ^GB570, 0, 2 ^FS
^F070, 970 ^GB650, 0, 2 ^FS
^F070, 975 ^GB650, 0, 2 ^FS
^F070, 980 ^GB650, 0, 2 ^FS
^F030, 1090 ^GB730, 0, 2 ^FS
^F030, 1095 ^GB730, 0, 2 ^FS
^F030, 1100 ^GB730, 0, 2 ^FS
^PQ10 ^XZ
4. This label format consists of a horizontal line that is two dot rows thick
separated by 5 vertical dots. When the motor is not balanced, the angular
rotation that the motor rotates per step is not equal thus causing a large or
small step increment. An incorrect step size will cause the separation
between dot rows to be inconsistent which can be seen in Figure 5.12.
5. The motor potentiometer should be rotated until the label format approaches
the quality of the label found in Figure 5.27.
Figure 5.28 Motor Balance Te st Pri ntouts
Improperl y Bal anced Step-Motor
Properly Balanced Step-Motor
Stripe Maintenance Manual: Volume 1 Corrective Maintenance
44868L Page 5-39
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