72A-2243-01 Rev. B 9/04 A-1
September 17, 2004
Appendix A. Voltage Selection
Altering the Voltage Rating from 115 Volts to 230 Volts
1. Remove the screws in the top panel of the M4110. There are six screws to
be removed. Use Allen keys of British dimensions; metric may not work.
Also, loosen two screws in the black knob on the rheostat control. Lift off
the knob.
2. The top panel should now easily lift up. The Teflon guide on the rheostat
rod is part of the top panel and does not need to be removed. If the top
panel does not lift, apply only a slight pressure to release it.
NOTE DO NOT REMOVE ANY SCREWS AT THE SIDES OF THE M4110.
ONLY THE SIX TOP SCREWS AND RHEOSTAT KNOB SCREWS
ARE TO BE TOUCHED
The Rheostat knob screws only need to be loosened, not removed from the
knob.
3. On the underside of this top panel there is a terminal strip.
4. For 115 Volts there is a yellow wire connecting to a yellow wire. To
change to 220 Volts, move the yellow wire to the white wire
right next to
this yellow wire. This white wire won't have another wire connected to it
(if it is set to 115 Volts)
When you are finished the yellow wire will be attached to the white wire.
5. Next, change the 115 Volt switch from the 115 Volt setting to the 220 Volt
setting:
This switch is on the "Relay PCB" which is attached to the Variac. This PCB
is very difficult to remove so don't remove it. You will see this switch from the
side of the PCB. Slide your finger down to the PCB and switch it to the
alternate position (which will be the 220 Volt setting). If the wire in step 4.)
above is set to 115 Volts, then this switch has to be switched as well. Note that
the use of a dentist mirror will assist to verify the setting of the switch before
you change it, and afterwards, to be sure it was indeed changed. You will see
the voltage setting as a number in the mirror. Remember that the mirror will
cause the number to show backwards or the switch may be upside down.
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