After a good week's worth of effort, I can say that this machine is back in proper working order.
It lit up straight away, as soon as I got it into the workshop. The credit counter 'add' solenoid caused a couple of problems. It had been replaced with one from a similar counter, but it proved to be open-circuit. The wires to this coil had been simply twisted together and taped. and had touched under the tape causing a short circuit. The 2p coin switch was burned-out, and the 10p side caught fire on insertion of a coin.
The machine uses open relays throughout, ACE-style, which makes fault-finding easier once you have cleaned all the contacts. I soon had everything up and running, with the araldite-strengthened controller frame working beautifully. All the 10p payouts were made correctly, but the lower-value combinations were all over the place.
There are only four sub-10p wins; 2p,4p and 6p for 1, 2 and 3 cherries, and 8p for 3 lemons. It refused to pay more than 4p on any win.
Now came the baffling bit. There was only ONE ten-notch cam on the payout drum, to pay all four minor wins AND add five credits to the counter for 10p in.
This was new to me, and it took some working out. I grasped the 10p credits bit first. The coin switch pulls in the credit relay, which latches. After five pulses, a contact on the payout drum drops it out.
The same for the payout relay. Four contacts on the drum cause it to drop out after 1,2,3 and four pulses respectively. After careful observation of the contacts in action, the last two of these turned out to be in the wrong positions on the drum. Someone had tampered with the cam settings, a nightmare!
In fact, it was quite an easy fix. What appeared to be the grub-screw holding each cam to the shaft, turned out to be an adjuster. Turning it one way moved the notch forward on the drum, the other way turned it back. Careful adjustment soon had all running correctly.
The shooting-gallery feature soon came to life with the usual cleaning and oiling. Only the faded artwork is left to do, which doesn't affect the play whatsoever.
A good game, with enough to keep the player interested.
It is almost certainly the decimal version of the original 'Crack Shot', which had a win counter, 'collect' button, 3-way coin accepter (6d, 1/-, 2/-) and all-token payout. It could be returned to sixpence (token) play with little difficulty, apart from the artwork, which annoyingly refers to all the wins in 'p'.
Another good machine. NEXT...