Engine control system
The engine control system coordinates all printer functions and drives the other three systems.
The engine control system contains these components:
●
DC controller
●
High-voltage power-supply PCB
● Low-voltage power unit
Figure 4-1
Engine control system components
Table 4-1
Sequence of operation
Period
WAIT
STBY (Standby period)
INTR (Initial rotation)
Duration Purpose
From the time the power is turned on or the door is closed until the drum-phase adjustment is complete
Clears the potential from the drum surface, adjusts the drum phase, and cleans the
ETB
From end of the WAIT or
LSTR period until either the print command is received from the formatter or the power is turned off
Maintains the printer in readiness for a print command
Remarks
Detects the toner level, cartridge presence, and environment; completes any required calibration (color registration control and image stability)
The printer enters sleep mode when the formatter sends a sleep command, and performs color registration and the image stability control when the formatter sends those commands
From the time the print command is received until the media is picked up
Prepares the photosensitive drum for printing
48 Chapter 4 Theory of operation ENWW
Table 4-1
Sequence of operation (continued)
Period
PRINT
LSTR (Last rotation)
Duration Purpose Remarks
From the end of INTR period until the fuser paper sensor detects the trailing edge of paper
Forms the images on the photosensitive drum and transfers the toner image to the print media
Performs image stabilization at a specified print interval or at specified times
From the end of the PRINT period until the delivery motor stops rotating
Moves the printed sheet out of the printer
The printer enters the INTR period as soon as the formatter sends another print command
Power-on sequence
ENWW
Figure 4-2
Power-on sequence
Engine control system 49
Motors, fans, and solenoids
Figure 4-3
Motors, fans, and solenoids
1.
Main fan (FM1)
2.
Fuser drive motor (M1)
3.
Print-cartridge drive motors (M6, M7, M8, M9))
4.
Pickup-and-feed motor (M4)
5.
Developing separation solenoids (SL5014, SL5015)
6.
ETB drive motor (M5)
7.
Developing separation solenoid (SL5011)
8.
Cassette pickup solenoid (SL5012)
50 Chapter 4 Theory of operation ENWW
9.
Multipurpose tray pickup solenoid (SL5013)
NOTE
The following parts are included only on duplexing printer models.
10.
Duplex reverse-drive motor (M11)
11.
Duplex flapper solenoid (SL10)
12.
Duplex-feed-drive motor (M10)
13.
Door fan (duplex models only) (FM2)
ENWW Engine control system 51
