HP M3027 Service Manual - Page 84
The lamp profile changes after 10 minutes of non-use. The device again performs lamp
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Table 4-2 Power-on sequence Step 1 2 3 4 5 6 7 8 9 10 11 Action Power-on CPU initialization Video-interface communication start Sensors check for residual media Main motor initial drive Fuser heater initial drive. The fuser heater reaches a surface temperature of 120°C. Fuser-motor initial drive Laser/scanner-motor initial drive 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 Failure/abnormality check: detection of laser/scanner failure, fuser failure, and open covers Communication with the memory tag Table 4-3 Power-on sequence for the ADF/scanner assembly Step 1 2 3 4 5 6 7 8 Action Power-on Initialize ADF and jam check Carriage-lock check Lamp warm-up Lamp-stability check Find reference-mark (for scanner right-side-edge location) AFE (analog front-end) 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