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Head Up Position Adjustment
Mechanical Head-Up Position
Figure 1 - Reciprocator Drive Groove at “Head Up” Position
Mechanical head up is when the drive slot of the reciprocator (the part that engages the drive stud on
the needle bar) is aligned with the needle bar drive slots on the left and right upper arm front covers.
Checking Electrical Head-Up (Z-Home) Position:
Electrically, head up is correct when the mechanical head up is set and the z-position reading on the
Head Timing menu is 26 ° ±1 °. Head up should not be confused with top dead center which is different.
When the mechanical head up position is read and you click on the Head Up button in the Head Timing
menu and the reading of the Z-position is 26 ° ±1 ° the machine is considered to be “timed.”
1. Remove the needlecase access cover and the needlecase
cover.
2. Launch the software.
3. Turn on the machine.
4. Click Tools>Maintenance in the main menu and then click the
Head Timing tab.
5. Click the Head Up command button. This will take the ma-
chine to electrical “Head-Up” position.
6. Click the Bottom Center button. This will put the machine at
electrical “bottom center” or “needle depth.”
7. Click Unlock Z. This will release the Z-motor.
8. Note the Current Z Position reading on the control panel. It
should read from 179.5 ° to 180.5 °.
9. Grab the needle bar and pull down on it. This will bring the bar and the z-shaft to the lowest
point in its movement.
10. Note the Current Z Position reading on the control panel. If it does not read between 179.5 ° to
180.5 ° , proceed to Adjusting Head-Up. If it reads between 179.5 ° to 180.5 ° , then the machine
is timed.
Figure 3 - Head Timing Menu
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