I've checked the wire to the speaker and it appears to be ok.
One thing that concerns me is that I cannot get into the test option to see if there is an option to adjust the volume. The test switch does not seem to work.
The machine does not pay out either suggesting there is a problem with the MPU board. It is a Scorpion 2. Ideally I need to take it to someone who can check the machine over and make the necessary repairs.
I am looking for someone in the Staffordshire/West Midlands area.