Maintenance and Troubleshooting
VERSAmax Tunable Microplate Reader Operator’s Manual 4-5
Changing the
Fuses
Fuses burn out occasionally and must be replaced. If the instrument does not
seem to be getting power after switching it on (the LCD shows no display),
Þrst check to see whether the power cord is securely plugged into a function-
ing power outlet and into the receptacle at the rear of the VERSAmax. If
power failed while the VERSAmax was already on, check that the power cord
is not loose or disconnected and that power to the power outlet is functioning
properly. If these checks fail to remedy the loss of power, follow the steps
listed below to replace the fuses. Spare fuses (two U.S. and two metric) are
shipped with the instrument. The U.S. and metric fuses are identical except
for physical size. They may be taped to the back of the VERSAmax.
If you no longer have spare fuses, you may obtain new ones from Molecular
Devices (part numbers: 4601-0013 for U.S., 4601-0014 for metric) or from a
local hardware store. Make sure fuses are rated SLOWBLOW (U.S.: 4-amp
time-delay; metric: 4-amp, 5 × 20 mm, time-delay).
To change fuses, follow the steps below.
1) Switch power to the instrument off and then remove the power cord from the
outlet and from the VERSAmax power cord receptacle.
2) Remove the printer cable and computer cable (if connected) from the back of
the VERSAmax.
3) Turn the instrument around for easy access to the rear panel.
4) On the left-hand side of the rear panel (viewed from the back) are the power
switch, fuse box, and power cord receptacle. As shown in the Þgures below,
press to the right of the black plastic cover of the fuse box to release it. Pull the
fuse box cover away from the instrument. The fuse box will begin to slide for-
ward.
Figure 4.1: Power Switch, Fuse Box, and Power Receptacle
Fuse Box Cover
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