I have a Whirlwind system 11b machine that uses a Aux power driver board and I now have problems with fuses being blow on powering up the machine. Fuses at location F1 and F4 blow immediately using 4 amp 250v buss fuses. This machine used to boot up with no problem in the past using these 250V 4 amp fuses. Have replaced with two brand new 4 amp fuses with the same results, blown. Is there some kind of other problem that could cause this that I need to check, am I using the proper amp fuses?
Thanks greatly for your help!