User guide

Height Sensor 10-13
To adjust the Gear Up (GU) stroke length:
CAUTION! Only an Asymtek-trained service technician should perform this procedure.
TIP Normally, the Gear Up (GU) stroke length should not need adjustment. The default GU
setting is 0.79 mm (0.03 in). A smaller setting may interfere with large dot dispensing,
which is greater than 1.3 mm (0.05 in), while a larger setting may interfere with the
needle.
1. Using the Z-axis controls, raise the Dispensing Head so that neither the needle tip nor the probe
tip are touching the work surface.
2. Using the 1/16-inch hex key, loosen the GU adjust locking screw (Figure 10-6) by rotating it two
turns to the left, approximately 0.79 mm (0.03 in).
3. Using the 1/16-inch hex key, turn the GU adjust screw to adjust the GU stroke length.
> To reduce the stroke length, turn the GU adjust screw to the left.
> To increase the stroke length, turn the GU adjust screw to the right.
4. In FmNT, click on
Tools in the Main Window, then click on I/O Test and click on Dispenser.
5. In FmNT, you must locate the I/O bit labeled
HS_PROBE1_UP/ and toggle the bit ON (I) and
OFF (0) to raise and lower the probe.
6. When you are satisfied with the settings, tighten the GU adjust screw by turning it two full turns
to the right.
> See Figure 10-6 for locations of the GU adjust screw and the GU adjust locking screw.
7. Run the
Height Sensor Setup procedure on page 10-7.