What did I just buy?

My background is in older Bally EM slots, and I've also done a lot of work fixing and restoring electronic pinball machines, and I decided I wanted to have a play around with a more modern fruit machine.
So I found this not far away on Ebay and I think the price was OK... It's a Club Casino Crazy
https://www.ebay.co....=p2047675.l2557
Like the Bally slots and pinball machines, I want to dig in and understand it better. So I paid my annual subs here, hope someone can help with the first dumb questions!
I think this is a JPM machine, although I've also found reference to Crystal (I didn't pick it up yet). Which is it?
Is a manual and/or schematics available somewhere, either as paper or to download?
Common things to check/fix? For example I know a lot of machines have a battery on the MPU, that's the same with pinball and removing to a remote battery pack is a good idea?
It has a £250 jackpot. How much money should be in the machine to make it worth playing?
The coin mech will need updating to the new £1 etc, is that something I can do or should I send the mech off to someone?
Just trying to get myself some grounding before I start my fruit machine journey.
thanks for any help
Mark