Use only the exact fuse type and rating specified by the manufacturer.
Never install a larger fuse, foil, or any bypass.
Do not power it on repeatedly; repeated attempts can cause further damage.
Next step
This fault needs qualified bench diagnosis before the unit is powered again.
Bench Technician Steps
This is the model of work a qualified electronics technician follows using the exact service manual and suitable test equipment. It is not a do-it-yourself instruction to work on energized equipment.
With the unit deenergized, document the original specified fuse and inspect the power supply, rectifier, output stage, and wiring for evidence of a short or heat damage.
Use appropriate deenergized semiconductor and resistance checks to look for shorted rectifier diodes, output devices, or power-rail faults; compare matched channels where the circuit allows it.
Before normal power is applied again, use a controlled current-limited start-up method and the exact service documentation to isolate abnormal current draw.