Bio-Rad CHEF-DR II System - Manual (Page 10)

Section 7
Main Switch Fuse Check
1) Turn the unit around so that the back of the unit is facing forward, and locate the black
plastic assembly containing the power cord receptacle on the lower left corner.
2) Turn the unit off and remove the main power cord from the receptacle (grasp the female
plug, not the cord, and pull gently).
3) Insert a small-bladed flat screwdriver into the narrow slot at the top and twist firmly. This
slot can be seen from above when looking down at the main power cord receptacle. The
front cover will open revealing two light gray fuse holders.
4) Using the screwdriver, gently pull the fuse holders forward (out). Remove the fuse from
the holder and examine. If the fuse is obviously burned, replace it with a 6.3 Amp, 250 V
Slo-Blo fuse (100/120 V) or 3.0 Amp, 250 V Slo-Blow fuse (220/240 V). Otherwise,
check the fuse with a volt-ohmmeter.
5) Place the fuse holders back into the slots such that the arrows on the fuse holders points
in the same direction as the two arrows on the inside of the front cover. Press the fuse
holders firmly into place, then close the front cover by pressing firmly at the top corners.
6) Replace the power cord. The unit is now ready for operation. If the unit still does not turn
on, or the fuse burns again, please contact Bio-Rad instrument service.
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