The Spectrum Tube Single Power Supply (ST-SPS) and Spectrum Tube Carousel Power Supply (ST-CAR) are fuse protected to prevent damage to the devices. The fuse is located between the switch and the port for the power supply on the back of each unit. Remove the fuse by unscrewing the cap with a flathead screwdriver.
Replace the fuse with a T1AL 250V, 5 × 20 mm miniature time delay/slow blow fuse. It can be readily sourced from local hardware stores or online retailers.