80 D292469I
If the air is turned ON and the needles still do not appear, it is
likely that the needle height has been incorrectly set and the
needles are being prevented from coming up to the required
height. Press the EJECT TEST key a second time to turn off the
Die Ejector then adjust the large Diameter Ring that surrounds the Ejector
Actuator in a counter clockwise direction. This will increase the maximum
needle height, which you can now test by pressing EJECT TEST key again.
4. Adjust Eject Speed (the time it takes for the needles to fully extend) using the
Micrometer Adjustment Knob on the left side of the Front Panel, next to the
Power ON/OFF switch.
This setting is nominally set to 1 at the factory. Turning this adjustment
clockwise, to less than 1 will slow the needle eject-time. Turning this
adjustment counter clockwise to greater than 1, will speed up the eject time.
Repeat the adjustment and EJECT TEST until the needles take around 0.5
second to fully protrude. This is a good starting point.
• If the speed of the ejection is too fast for the die size being picked, or
the vacuum supply is inadequate, the film may lift off the Vacuum
Head before the tape has had time to peel off the back of the die.
• The actual speed setting must be found by experiment, since the tape
adhesion varies widely with wafer backing, type of tape, age of the
tape, ambient humidity etc.
• With very large die or for fragile structures, for example, an eject time
of 2 or 3 seconds would not be unusual.
Warning: With die less than 0.010 thick or made from Gallium Arsenide,
there is danger of cracking the die from using excessive eject speed.
Note: Pneumatic Ejectors only, see Motorized Ejector section on page 94 for
details.
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