Table 4-2 Power-on sequence
Step Action
1 Power-on
2 CPU initialization
3 Video-interface communication start
4 Sensors check for residual media
5 Main motor initial drive
6 Fuser heater initial drive. The fuser heater reaches a surface temperature of 120°C.
7 Fuser-motor initial drive
8 Laser/scanner-motor initial drive
9 High-voltage control
Detection of the presence of a print cartridge
Cleaning of the transfer roller after the primary charging ac bias is turned on
10 Failure/abnormality check: detection of laser/scanner failure, fuser failure, and open covers
11 Communication with the memory tag
Table 4-3 Power-on sequence for the ADF/scanner assembly
Step Action
1 Power-on
2 Initialize ADF and jam check
3 Carriage-lock check
4 Lamp warm-up
5 Lamp-stability check
6 Find reference-mark (for scanner right-side-edge location)
7 AFE (analog front-end)
8 PRNU (photo-response non-uniformity) and DSNU (dark-signal non-uniformity) correction. This procedure is
performed with the lamp on. The carriage moves under the white calibration strip.
NOTE The lamp profile changes after 10 minutes of non-use. The device again performs lamp
warm-up and PRNU and DSNU correction.
72 Chapter 4 Theory of operation ENWW
To Next Page
Loading...