THORLABS MC2000 - Part 8. Fuse Replacement and Line Voltage Selection; Materials Needed; Fuse Replacement and Line Voltage Selection

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Optical Chopper System

18488-D02 Rev G, September 24, 2012 Page 20 www.thorlabs.com

Part 8. Fuse Replacement and Line Voltage Selection

Thorlabs ships the MC2000 unit configured to operate at 100/115 VAC. The line voltage and installed

fuse must be changed to operate this unit at 230 VAC. Follow the instructions below to change the line

voltage if necessary.

Warning Electrical Shock

The unit must be powered off, unplugged from the AC input power source,

and disconnected from all external devices before removing the cover and

replacing the fuse. Failure to do so may cause serious injury to the user since high

voltages exist within the unit.

8.1. Materials Needed

• MC2000 Operating Manual

• 250 mA Type IEC60127-2/III, Type ‘T’ Slo-blo Fuse – The 250 mA fuse is installed from the

factory and must be installed when operating the unit at 100/115 VAC.

• 125 mA Type IEC60127-2/III, Type ‘T’ Slo-blo Fuse – Thorlabs supplies a 125 mA fuse to be

installed when operating at 230 VAC.

• Phillips Head Screwdriver (#2 Preferred) – Motorized screwdrivers are not recommend.

8.2. Fuse Replacement and Line Voltage Selection

1. Important! – Make sure the power cord, optical head, and any external devices are disconnected

before continuing. See warning above.

Remove the two screws securing the enclosure cover with a Phillips head screwdriver. The

screws are located on the bottom side, rear corners of the unit. Place the screws in a safe

location.

Carefully remove the cover by sliding it toward the rear of the unit.

To change the line voltage, locate the line select switch behind the power switch. Select the

appropriate line voltage by adjusting the switch to either 110 or 220. Select 110 if operating at

100 to 120 VAC. Select 220 for operation from 220 to 240 VAC.

Replace the enclosure cover and secure with the enclosure screws.

Locate the fuse holder below the power input connector. Slide the fuse tray out using a flat head

screwdriver. Remove the fuse and replace with the appropriate value as described below:

• 100 – 120 VAC operation – Use the 250 mA fuse

• 220 – 240 VAC operation – Use the 125 mA fuse