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What model is your AMI jukebox, please?
In some models, dirt on the 'Opto switch' can cause the errors. It would need to be cleaned gently. But I'm not sure what model you have, so please tell me. Thanks.
Do you know where the Service Mode switch on your AMI jukebox is? it may be needed.
As for its not picking up 45 rpm records, that is probably owing to the selector mechanism or electronics not working, or not finding selection selected, etc.