Waste Ink Level Detection; Remaining-Ink Level Detection - Canon BJC-55 Service Manual

BJC-50

5.6 Waste Ink Level Detection

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
Purge counter (for non-volatile substance)
Purge counter (for volatile substance)
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.
Detection Function
Paper
Paper delivery
Home position
BJ cartridge
Ink cartridge
Remaining ink
BJ cartridge
identification
Waste ink
absorption
Lithium ion battery
TABLE 4-5 DETECTION FUNCTION
Description
Detection with paper end sensor
Detection with delivery sensor
Detection with home position sensor
Detection with head rank and head
temperature sensor
Calculation from dot count and recovery
count (Set the function to on/off by
function setting)
Identification by head ID0 and ID1
Calculation from dot count and recovery
count
Detection by thermistor inside the battery
ng counter
10 mg counter
10 mg counter
Availability
Available
Available
Available
Available
Not available
Available
Available
Available
Available
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Part 4: Technical Reference
Remarks
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