Timing
Sequence of operation
Operation sequences are controlled by the microprocessor on the DC controller.
Table 5-1 Sequence
of operation on page 73 describes engine operations for each period of a print operation.
Table 5-1 Sequence of operation
Name Timing Purpose
WAIT From power-on until the end of the main motor
initial drive
Detects presence of a print cartridge. Clears
potential from the drum surface and cleans the
transfer roller.
STBY (standby) From the end of the WAIT or LSTR period until
either a print command is sent from the formatter or
the power is turned off.
Prepares the printer to receive print commands
INTR (initial
rotation)
From the time of the print command until the pickup
solenoid is turned on.
Prepares the photosensitive drum for printing.
PRINT From the end of the INTR period until the primary
high-voltage is turned off.
Forms the image on the photosensitive drum and
transfers the toner image to the media.
LSTR (last
rotation)
From the end of the PRINT period (when high-
voltage is turned off) until the main motor stops
rotating.
Delivers the last page of a print job.
After LSTR, the printer either returns to STBY or, if
another print command was sent from the
formatter, enters INTR.
Power-on sequence
Table 5-2 Power-on sequence
Step Action
1 Power-on
2 CPU initialization
3 Video interface communication start
4 Check sensors for residual media
5 Main motor initial drive
6 Fuser heater initial drive. The fuser heater reaches a surface temperature of 100°C.
7 Laser/scanner motor initial drive
8 High-voltage control
Detect presence of a print cartridge
Clean the transfer roller after the primary charging ac bias is turned on
9 Failure/abnormality check: detect laser/scanner failure, fuser failure, and open covers
10 Communication with the memory tag
ENWW Timing 73
For more information on the LaserJet P2015 Visit www.PrinterSupplies.com 800-551-1943
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