I recently bought a Durst L1200 colour enlarger. The TRA 450 transformer didn't work at first. It had a 5A fuse instead of a 2.5A fuse. I checked the inside and made sure it was set to 240 V and replaced the fuse with a 2.5 A one. It then worked, at least for a little while but blew the fuse after several on/off cycles. I have since gone through several more fuses in the same manner. These are ceramic fuses which I found at Jaycar.

Can somebody please suggest a repair place where they would be able to check out the transformer to work out why it keeps blowing fuses?

Thanks for your help.