惠普 M712n M712dn M712xh 黑白激光打印机维修手册+故障排除手册
The DC controller stops the power supply of +24V according to the +24V CONTROL signal
(RMT_24V) and POWER FACTOR CORRECTION ACTIVATE signal (RMT_PFC) after a specified
period of time from when a sleep command signal is sent from the formatter. The DC controller
supplies +24V and the product exits sleep level 1 when a recover signal is sent from the formatter.