Epson Stylus CX3700 Service Manual page 50

EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850
Independently of the printing path after the previous CL, perform manual CL from
CL1 to CL3 in order if the cumulative printing timer counter is less than 9min.
Only when the cumulative printing timer counter is more than 9min, execute only
CL1.
Additionally, if the I/C is Ink Low or Out condition, any manual cleaning is
prohibited and it is displayed on the LED indicators.
OPERATING PRINCIPLES
Timer Cleaning
Like the previous printers (Stylus Photo R300/R310), this printer dose not have
Lithium battery which is used for the backup power source for Timer IC. So, this
printer manages the printer off period or cleaning cycle by using the following
method.
The Printer Driver sends the timer command to the printer before printing. The
timer command is generated based on the PC's timer and it consists of year,
month, date, hour, minute and second. As soon as the printer receives the timer
command from the Printer Driver, the printer stores its command in address
06<H> and 07<H> in the EEPROM. Then, it is compared with the latest CL time
which is stored in address 04<H> and 05<H> in the EEPROM. And, In case that
the timer cleaning period is over the specific period, the printer performs the timer
cleaning automatically. In this time, the printer stores the timer command in
address 04<H>, 05<H>, 06<H>, 07<H> in the EEPROM.
Maximum 2.03g of the ink is consumed in the timer cleaning. (1.015g of black ink
and 1.015g of color ink are consumed.)
Flashing
Two different flushing operations are executed for the following reasons.
Pre-printing flushing
This is done before a start of printing to eliminate ink viscosity in the Print
Head nozzles.
Periodic flushing
This is done during printing to prevent ink viscosity in the Print Head nozzles
from increasing.
Printer Mechanism
Revision A
50