Reproduction machine service control

Abstract From the Canadian patent

Control apparatus for a xerographic type copying machine which enables the service technican to give the machine operator or user, as the operator's experience and training progresses, increased control over, and responsibility for critical machine operating settings. The control apparatus includes a master lock to prevent unauthorized tampering with the machine settings by anyone except the authorized service technican. Individual locks, assessible only to the service technican, are provided for controls which it is expected that the operator or user, with training and experience can ultimately, handle. To nevertheless restrict and control the degree of operator responsibility and …