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CONVERSION FOR DIFFERENT INPUT VOLTAGE
MP4s are shipped from the factory pre-wired for either 115 VAC or 230 VAC, per your order. If at any
time you need to change the voltage from one to the other, perform the following steps:
WARNING: Unplug the unit from power source before changing transformer jumpers
1 Loosen the Allen type button head screws located on the both sides of the Electronic Control Unit .
Remove the cover by lifting vertically.
2 The power transformer is located on the right-hand side of the Electronic Control Unit, just behind the
front panel. For 115 volt operation, jumper wires are connected between terminal 1 and terminal 3 and
between terminal 2 and terminal 4. For 230 volt operation, a single jumper wire is connected between
terminal 2 and 3, as shown in figure C-1.
Jumpers
Figure C-1. Jumper Connections for Control Transformer
CAUTION: Do not wiggle the terminals of the control transformer. Pry Fastons off using the blade of a
screwdriver.
3 Use the following fuse on the rear of the Electronic Control Unit, as appropriate:
For 120 Vac, use a 1/2 amp slow-blow fuse
For 230 Vac, use a 1/4 amp slow-blow fuse
CAUTION: Do not change fuse, F3, on the Pull Module. Regardless of the line voltage, this fuse should
always be rated 0.5 amp, slow-blow.
4 Replace the plug from the existing line cord with the appropriate plug.
5 Replace the cover and re-tighten screws.
990-180
APPENDIX C
Transformer
1
2
3
4
Wired for 115 V, 50/60 Hz
®
MICROPULL
IV WIRE BOND PULL TESTER
Jumper
Wired for 230 V, 50/60 Hz
Transformer
1
2
3
4
C-1
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