| 摘要 |
<p>A printing machine comprises a charging device (10) that forms a variable operating voltage. A charging device pre-fault status condition is determined by sampling (11) the charging device (10) 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 falls in a charging device pre-fault status range of values (200). When the pre-fault status determination is made, a message (110, 120, 130) is formed based on a current print count value (21). This message is then sent to a user or operator (1). 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 (10) needs to be replaced. Otherwise, when the print count value (21) does not fall in this range of values, a cleaning message is sent to inform that the charging device (10) needs to be cleaned. <IMAGE></p> |
