Downstop Adjust - Unitek MICROPULL IV MP4/115 Operation And Maintenance Manual

5 Turn the BEAM TRAVEL control to MAX. The beam should now travel 3/4-inch when the Control
Lever is raised.
6 With the Control Lever in its lowest position the DOWNSTOP control will now adjust the hook position
approximately 1/4 inch.
NOTE: These controls interact. Specifically, they divide a total of one-inch movement in the following
manner:
BEAM TRAVEL Control
MIN
MAX
Midpoint
7 Select the beam travel which best suits your package.
NOTE: The End Of Test Conditions are met when:
a A bond failure occurs
b The PRESET FORCE is reached and the HOLD TIME expires.
c The beam hits the electronic Upstop.
d The MP4 is in the Non-Destruct Mode and the force reaches 100% of full scale.

DOWNSTOP Adjust

NOTE: As the BEAM TRAVEL and the DOWNSTOP controls interact, the BEAM TRAVEL should be
adjusted before adjusting the DOWNSTOP control.
1 Adjust the BEAM TRAVEL so that the travel exceeds the height of the package. With the Control
Lever down, adjust the DOWNSTOP control so that the device can slide under the hook.
2 Readjust the DOWNSTOP control so that the hook is close to, but does not hit the device substrate. If
the adjustment is insufficient, switch the POWER switch to OFF and move the beam module to a
different location on the beam arm . Check that both adjustments are set so that the device can be easily
placed under the hook without damage.
3 With the Control Lever in the up position, turn the UPSTOP control counterclockwise until the red Test
Status indicator just blinks. The Upstop is now set to the position that corresponds to the highest
position of the beam arm as determined by the BEAM TRAVEL adjustment. This should be between
1/4-inch and 3/4-inch above the device substrate.
4 Place the MODE switch to NON-DESTRUCT and the HOOK RETURN switch to AUTO. The beam
will automatically return to the Downstop after it hits the Upstop.
5 Press the footswitch and the process will be repeated. If you raise the Upstop the hook will not return
unless you return it manually as none of the End Of Test conditions are met. When the HOOK
RETURN switch is set to MANUAL, the beam stops when any one of the conditions is met.
990-180
Actual Beam Travel Actual DOWNSTOP Adjustment
1/4"
3/4"
1/2"
®
MICROPULL IV WIRE BOND PULL TESTER
CHAPTER 3: OPERATING INSTRUCTIONS
3/4"
1/4"
1/2"
3-5