HP 5100 Service Manual - Page 103

Basic sequence of operation The formatter PCA and the dc controller board share information over a serial data bus. This allows printer status, command, and dot-image data to be passed between the two PCAs. Table 27 shows the general timing of the printer events. The following events take place during normal printer operation: Table 27. Basic sequence of operation Period Timing Purpose Remark WAIT From power on until the main motor completes the initial drive. Clears the drum surface potential and cleans the transfer charging roller. During this period, the printer detects the toner level and the presence of the cartridge. STBY (standby) From the end of the WAIT period until the /PRNT signal is input from the formatter, or from the end of the LSTR period until the /PRNT signal is input from the formatter or until the power is turned off. Makes the printer ready to print. INTR (initial rotation) After the /PRNT signal is input Stabilizes the sensitivity from the formatter until the dc of the photosensitive controller outputs the /TOP drum in preparation for signal. printing, and cleans the transfer charging roller to stabilize the transfer high voltage. PRINT From the end of the INTR period until the top of the paper sensor detects the trailing edge of the paper. Forms an image on the During this period, the photosensitive drum printer detects the according to the /VDO remaining toner. and VDO signals input from the formatter, and transfers the image to paper. LSTR (last rotations) After the primary dc voltage turns off until the main motor stops. Delivers the final page and cleans the transfer charging roller. As soon as the /PRNT signal is input from the formatter PCA, the printer enters the INTR period. Q1860-90918 Chapter 5 Functional information 101