HP M750 series

Sequence of operation
The DC controller in the engine-control system controls the operational sequences of the product. The
following table describes durations and operations for each period of a print operation from the time the
product is turned on until the motor stops rotating.
Normal sequence of operation
Table 1-1 Sequence of operation
Name Timing Purpose
WAIT From the time the power switch is turned on, the door is
closed, or the product exits Sleep mode, until the
product is ready for a print operation.
Brings the product to a printable condition:
●
Detects and heats the fuser
●
Detects the print cartridge and any cartridge
changes
●
Detects the ITB, and moves the ITB and the
developing unit to the home position
●
Cleans residual toner from the intermediate
transfer belt (ITB) and the secondary transfer
roller
STBY (standby) From the end of the WAIT or LSTR period until either a
print command is sent or the power switch is turned off.
Maintains the product in printable condition:
●
Enters Sleep mode if the sleep command is
received
●
Performs a calibration if the calibration command
is received
INTR (initial
rotation)
From the time the print command is received until the
product picks up a piece of paper.
Prepares for the print job
●
Activates the high-voltage power supply
●
Activates the laser scanner
●
Opens the laser shutter
●
Cleans the protective laser glass
●
Engages the print cartridges
●
Warms the fuser
ENWW Basic operation 3