The door switches can cause this problem, particularly those above the fuser. However, I've also had the laser sync detector board (the small board at the rear of the laser unit) P/No A2935310 go on them and cause this fault.
Having said that, having 8 machies doing the same thing is verging on the impossible - try upgrading them all with something totally different, like tracing paper and a sturdy HB pencil.
Having said that, having 8 machies doing the same thing is verging on the impossible - try upgrading them all with something totally different, like tracing paper and a sturdy HB pencil.
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