Canon BJC 6000 Service Manual - Page 88

Part 4: Technical Reference BJC-6000 2.4 Pause Between Scanning This printer features pause between-scanning to prevent bleeding and white clouding be caused by differences in characteristics between color ink and black ink. This function allows the border between the color ink and black ink to be detected during internal print data processing so that, when detected, an appropriate pause will be imposed on each print mode and color to prevent bleeding. Since this function decreases the printer's throughput, it will only be activated when enabled by the user and when printing on plain paper, for which this type of bleeding occurs easily. 2.5 Pause Between Pages Immediately after ejection, printed paper is left to dry on the paper eject tray naturally. If the next paper is ejected before the previous page has dried completely, ink-smearing may occur. To prevent this, 1-minute pause will be imposed on for all pages before printing starts, to delay paper ejection so the preceding page can dry. This is particularly useful for slow-drying print media such as transparencies. 2.6 Smear Control Immediately after being ejection, printed paper is left to dry on the paper eject tray naturally. The next paper is ejected before the previous page has dried completely, inksmearing may occur. To prevent this, wait-time is added into the printing process, delaying paper ejection so the preceding page can dry. After printing at high speed with the Black BJ cartridge at high duty on plain paper or postcards, this printer automatically determines both the high duty printing position and time elapsed after printing, to control smearing ( default setting is ENABLE.). 2.7 Auto Power ON/OFF This printer can switch itself on in response to print signals from the host computer and switch itself off if left for a certain period of time without incoming print signals. These settings can be made with the printer driver. When Auto Power ON is enabled, the printer powers on if more than 3 bytes of data are received consecutively. Thus, the interface unit is enabled, even if the printer is switched off. When Auto Power OFF is enabled, the printer powers off if a certain period of time has elapsed without receiving print data from the host computer. If, however, an error exists, paper is in the manual feed slot, or the front cover is open, the printer will not power off. 2.8 Head Overheat Protection If the printer continues to print after ink has run-out, the bubble jet head will overheat. To prevent this, when the head temperature sensor inside the bubble jet head detects a temperature higher than the specified range, overheat protection is performed. Protection level 1: Prevents the user from touching the hot aluminum plate of the head when replacing the bubble jet head by preventing the carriage from moving to the cartridge replacement position for fixed time, even if the front cover is open. Protection level 2: If a further rise in temperature is detected, after printing 1 line of text, the carriage returns to the home position for 3.5 seconds to allow cooling before continuing printing. This protection continues for more than 20 seconds. Protection level 3: If an even higher rise in temperature is detected, the printer sees this as head temperature error and stops printing. If the problem persists, the printer sees it as a head temperature sensor failure and displays the head temperature error message. The ENABLE TIME can be 5 min., 10 min., 15 min., 30 min., or 60 min. 4-16