4.3 Replacing a Fuse
If there is no display, lights, or fan, and the PowerPac Basic is plugged into a working AC
power outlet with the power switch in the on position, the fuse may need to be replaced.
1. Disconnect the power cord from the electrical outlet.
2. Insert a flat blade screwdriver into the notches of the power entry module's fuse
holder to release it. See Figure 5.
3. Remove the fuse from the fuse holder. Replace with 2.5A, 250V, 5 X 20 mm fuses
(Bio-Rad part number 900-7283).
4. Re-insert the fuse holder into its position. Press the fuse holder gently until it snaps into
place.
The unit is now ready for use.
Fig. 5. Rear View Showing Fuse Drawer with Notches.
Note: Repeated blowing of the fuse indicates a hardware failure and Bio-Rad should be
contacted for repair.
4.4 Firmware Version Number
To display the PowerPac Basic’s firmware version number while the power supply is off,
hold down the constant parameter key and concurrently turn the power switch to the on
position. All of the LEDs and segments in the 3 digit LED display will light. Release the
constant parameter key and the firmware version number will then appear for a few
seconds. The power supply is now ready for operation.
NOTCHES
FUSE DRAWER
9
