Canon BJC 50 Service Manual - Page 133

BJC-50 5.6 Waste Ink Level Detection Part 4: Technical Reference Ink ejected by the maintenance jet or collected from purging during recovery is absorbed by the waste ink absorber. The total amount of ink consumed is calculated by adding the number of dots ejected and the recovery counts. The EEPROM waste ink counter is divided into the following sub-counters: Maintenance counter ng counter Purge counter (for non-volatile substance) 10 mg counter Purge counter (for volatile substance) 10 mg counter During the various types of maintenance operations, the dots ejected are counted and recorded in the ng counter. When the ng counter exceeds 100,000,000 ng (100 mg), 50 mg will be added to each of the non-volatile and volatile counters. During the various types of recovery, all the ink drawn from the print head is read and recorded separately as non-volatile and volatile counters. All recordings for volatile substances are calculated based on the elapsed time. Amount less than 10 mg will be recorded in the ng counter. Volatile Substance = Evaporated amount × (1-25/non-volatile material) When the reading for the ng counter and 10 mg counters reach the 84000 mg limit, an WASTE INK ABSORBER error will occur, causing the printer to stop. 5.7 Remaining-ink Level Detection This function detects the remaining ink level and notifies the user that the ink has run out. (The function is enabled or disabled by the BJ controller.) The dot counter for each color of ink in the ASIC counts the number of dots ejected. When cleaning is performed, ink is consumed by purging, and the total number of dots and recovery counts is written into the EEPROM. When the power is turned off, paper is delivered out, or cleaning operation ends. The ASIC reads the EEPROM contents when the printer is turned on with the POWER button. If the remaining ink level reaches the prescribed value, a caution will appear, notifying the user that the ink is low (the printer can operate even after a caution is displayed). Change the settings in the original printer driver to the replacement mode before replacing an ink cartridge. The driver will reset the ink counter. TABLE 4-5 DETECTION FUNCTION Detection Function Paper Paper delivery Home position BJ cartridge Ink cartridge Remaining ink Calculation from dot count and recovery count (Set the function to on/off by function setting) Identification by head ID0 and ID1 Description Detection with paper end sensor Detection with delivery sensor Detection with home position sensor Detection with head rank and head temperature sensor Availability Available Available Available Available Not available Available Default: OFF Remarks BJ cartridge identification Waste ink Calculation from dot count and recovery absorption count Lithium ion battery Detection by thermistor inside the battery Available Available Available 4-45