HP LaserJet P1500 Service Manual - Page 38

Timing

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Timing Sequence of operation Operation sequences are controlled by the microprocessor on the DC controller. Table 3-1 Sequence of operation on page 26 describes engine operations for each period of a print operation. Table 3-1 Sequence of operation Name Timing Purpose WAIT From power-on until the end of the main motor initial Detects presence of a print cartridge. Clears potential drive from the drum surface and cleans the transfer roller. STBY (standby) From the end of the WAIT or LSTR period until either Prepares the printer to receive print commands a print command is sent from the formatter or the power is turned off. INTR (initial rotation) From the time of the print command until the pickup Prepares the photosensitive drum for printing. solenoid is turned on. PRINT From the end of the INTR period until the last page Forms the image on the photosensitive drum and completes the fusing operation. transfers the toner image to the media. LSTR (last rotation) From the end of the PRINT period 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. 26 Chapter 3 Theory of operation ENWW

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Timing
Sequence of operation
Operation sequences are controlled by the microprocessor on the DC controller.
Table
3
-
1
Sequence
of operation
on page
26
describes engine operations for each period of a print operation.
Table 3-1
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 last page
completes the fusing operation.
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 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.
26
Chapter 3
Theory of operation
ENWW