| 摘要 |
A printing machine comprises a charging device that forms a variable operating voltage. A charging device pre-fault status condition is determine d by sampling the charging device operating voltage, forming a slope value based on a charging device operating voltage rate of change per unit time, and determining when the slope value fails in a charging device pre-fault status range of values. When the pre-fault status determination is made, a message is formed based on a current print count value. This message is then sent to a user or operator. When the print count value falls in a charging device replacement range of values, a replacement message is sent to inform that the charging device needs to be replaced. Otherwise, when the print count value does not fall in this range of values, a cleaning message is sen t to inform that the charging device needs to be cleaned.
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