Bio-Rad PowerPac™ HV High-Voltage Power Supply - Manual (Page 37)

Section 6
Maintenance and Troubleshooting
6.1 Maintenance
The PowerPac HV requires little maintenance to ensure reliable operation. To clean the
case, first unplug the power supply. Use a soft, damp cloth to wipe the outer case.
Keep the PowerPac HV away from liquids. Prevent them from entering the case.
Inspect the power cord regularly. Replace it if the cord is damaged or the prongs are bent
or corroded (catalog #165-9005).
Replace the temperature probe if the cord is damaged or the connectors are bent or
corroded (catalog #165-5058).
6.1.1 Replacing a Fuse
If the power supply is plugged into a working outlet with the power switch ON, and there is
no display, lights nor fan operation, the fuse may need to be replaced.
1. Disconnect the power cord from the electrical outlet.
2. Use a slot head screwdriver to press the tabs on the side of the fuse holder toward
each other. This will release the fuse holder and the fuses. (Figure 15) Inspect the
fuses visually to determine if one or both of the fuses are blown. If a fuse is blown, it will
be discolored or the internal element will be broken.
3. Remove the blown fuse from the holder. Replace it with 8 A, 250 V, 5 x 20 mm, type T,
fuse (catalog #900-8933).
4. Reinsert the fuse holder into position. Press the fuse holder gently until it snaps into
place on both sides.
5. Reconnect the power cord to the outlet. The unit is now ready for use.
Fig. 14. Location of fuse
Note: If the fuses need to be replaced regularly, there may be a hardware failure. Contact
Bio-Rad Technical Support.
NOTCHES
FUSE
DRAWER
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PowerPac HV – Instruction Manual