Sequence of Operation The formatter system and the Engine Controller Assembly system share information during printer operation. The Engine Controller Assembly-to-formatter connector forms a link which operates as a serial data bus. This lets printer status, command information, and dot-image data to be passed between the two systems. The events described in the table below and shown in “Timing Diagram” (page 70) take place during normal printer operation. Table 5-1. Print Period Descriptions (see “Timing Diagram” (page 70)) 68 5 Functional Overview C4170-90959 Period Timing Purpose WAIT From the time power is switched on to the end of the main motor’s initial rotation.
Clears the drum surface potential and cleans the Transfer Roller. Also detects whether or not the toner cartridge is installed. Standby (STBY) From the end of the WAIT period until the input of the PRINT signal from the Formatter. OR: From the end of the Last Rotation period until either the input of the PRINT signal from the Formatter or the power is switched off. Maintains the printer in a ready state. Initial Rotation (INTR) From the input of the PRINT signal from the Formatter until the paper reaches the top-of-page sensor. Stabilizes the sensitivity of the photosensitive drum in preparation for printing.
PRINT From the end of the INTR period until 2 seconds after the top-of-page sensor detects the trailing edge of the paper. Forms images on the photosensitive drum based on the /VDO signal from the Formatter and transfers the image to the paper. Last Rotation (LSTR) From the completion of printing until the main motor stops rotating. Returns to the INTR period if the Formatter sends another PRINT signal. Otherwise, returns to the STBY period. Delivers the last sheet of paper. Also cleans the Transfer Roller.