Worn drive belt slipping on the motor pulley. Manual solution: Remove the rear access panel. Loosen the motor mounting bolts (size 7/16” wrench). Pry the motor backward to tension the belt until it deflects only 1/4 inch under moderate thumb pressure. Retighten bolts.
On early models—in the IEC power inlet module (a small drawer pulls out). On later models—a 5x20mm fast-blow 2.5A fuse inside the control box near the power switch. burrell model 75 manual
The manual opens with stark, black-and-white illustrations of danger zones: Worn drive belt slipping on the motor pulley