If your instrument does not power up we suggest checking the fuse. 

Changing the fuse:

Ensure that your instrument's power cord is fully inserted and the plug has not dislodged from the socket. If the power cord is not the source of the issue move onto checking the fuse. 

1. Remove power cord from wall socket and from the instrument.

2. Locate the fuse on the back panel labeled F1:

3.  Using a small flathead screwdriver, twist the cap to release the fuse holder: 

4. Remove fuse holder and replace with the same rated fuse (Fuse: 2.5A, 250V, 5x20, T(Time Delay)):

Checking to see if the fuse is blown:

Ref:  Cordero, I. (2012) Checking and Replacing fuses. Community Eye Health, Vol. 25(76): 37.

Safety Note: If you replace a fuse and it immediately fails, please contact BTX-Harvard Apparatus right away.

• After removing the fuse (as outlined above). Remove the fuse from the holder.
• If you see discoloration/burning on the fuse then it is bad, but this does not always occur.
• Look for the fuse wire, you may be able to see a gap/break in the wire if you can see a break then the fuse is bad.
• However, you can also check with a multimeter.
• Set the multimeter to the Ohm setting.
• Place one lead on one side's metal cap and the other lead on the other end's metal cap. If the reading is between 0 and 5 then it is good. If the fuse has a higher rating or comes up overlimit then it has blown.