HP M1522nf Service Manual - Page 66

Basic operation This chapter presents an overview of the relationships between major components in the product, and includes a detailed discussion of the image-formation system. The following systems are discussed: ● Engine control system ● Laser/scanner system ● Pickup/feed/delivery system ● Image-formation system Figure 4-1 System block diagram Sequence of operation for the base unit Operational sequences are controlled by the microprocessor and the DC controller. Table 4-1 Sequence of operation Name Timing Purpose WAIT From power-on until the end of the main-motor initial Detects the presence of a print cartridge; clears drive potential from the drum surface and cleans the transfer roller See Table 4-2 Power-on sequence on page 49 for a complete description of the WAIT (power-on) period. STBY (standby) From the end of the WAIT or LSTR period until either Prepares the product 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 48 Chapter 4 Operational theory ENWW