Timers And Counters - Epson Stylus Photo Service Manual

2.3.2 Timers and Counters

In this printer, there are several kinds of timer counters, soft counters and flags before each ink sequence
is determined and most of them are stored in the EEPROM.


Periodic Flushing Timer Counter
This timer is for periodic flushing. This timer counter is reset when the printing starts, or periodic
flushing or flushing in the waiting state is performed.


CL Timer Counter
This is the timer that manages auto cleaning. It remains active while the printer is turned off and is
reset when the cleaning(ink absorption) is executed.


Accumulated Printing Timer Counter
This timer accumulates the period of time spent for printing and retains its values even at the power
off. This timer starts counting when the cap is opened and stops counting once when the printer
enters to waiting state. The value of this counter is reset when the ink absorbing operation is
performed.



Stop Timer
This timer monitors how long the head is capped in the waiting state during the power is
still on. If ink absorption is performed in the waiting state, this timer starts counting after flushing at
power on. It is reset when the cap is released from the head.


Power Supply Block Timer
This timer measures time from power off to power on. This timer starts at power off and stops
when the ink absorbing is performed at power on.


Ink Counter Rb, Ry
This counter is installed individually for black(Rb) and Color(Ry) and monitors amount of ink used in
the cap during the flushing operation. Its value is retained even at the power off. When the value
exceeds a specified value, false absorbing is performed and resets the value.



CL2 Counter KK
This counter is for determining the order of manual cleaning sequence operated by the panel
button. A cleaning is usually performed in the order of CL1, CL'1, and CL2. This printer, however,
does not necessarily follow this order depending on the numbers of pages printed after the last
cleaning operation.



Protect Counter A
This counter monitors the quantity of ejected ink to the ink waste pad. If the quantity exceeds a
specified value, maintenance error is indicated. This counter is reset by operating EEPROM reset
operation.


Ink Consumption Counter Cb, Cy, Cm, Cc, Cml, Ccl
This counter is installed individually for black and color inks. This counter counts consumed ink
quantity over printing, cleaning and flushing after the cartridge is exchanged. It also counts a certain
amount of ink even when the power is turned off during the cleaning operation. This counter is reset
when the ink cartridge is removed from the printer during the ink cartridge exchange sequence.
Rev. A
Chapter2 Operating Principles
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