I see several fusecaps in one of your photos. Often the various power supply voltages will each have a fuse, are there any labels near the fuses to tell you what voltage to expect? If so, you can meter the voltages there. It is a good idea on a machine that is new to you to check that the fuses installed are the right amperage size, in case someone put the wrongs ones in before you got it.
I'm not very familiar with the Aristocrat machines, hopefully someone here that is will give you suggestions and advice. Also, does the machine have a full model name, something other than "R10 CB"?