Cr Lock Mechanism - Epson PH890 Service Manual

EPSON Stylus Photo 890/1290

2.1.3.1 CR Lock Mechanism

The carriage lock mechanism prevents the carriage from being left uncapped for a long
time, which is usually caused by vibration during printer transportation, user's
mishandling of the printer, and so on. If the carriage unit is left uncapped for a long
time, ink on the printhead surface dries gradually and, eventually, ink can not flow to
nozzles. In addition to that, there is a possibility that the nozzles clogged with dried ink
can not be recovered by a head cleaning. To avoid this problem, the printer locks the
carriage unit under the circumstances below:
o
After Power-Off
If the printer power is turned off in the middle of printing or other operations, the
printer completes the initialization sequence and then performs a carriage lock.
o
After Power-On
When the printer is turned on, the printer automatically begins a power-on cleaning
and then performs a carriage lock.
[Power-on cleaning]
The printer runs a power-on cleaning automatically when its power is turned on. Since
the timer IC on the main control circuit board is powered by a lithium battery that is
also mounted on the board, it keeps counting the printer's power off time. According to
the power of time counted, the printer selects the cleaning level to perform.
o
After paper ejection
If the printer does not receive any print data after Load/Eject button is pressed, it
performs a carriage lock and enters a standby status. But if paper is fed into the printer,
the printer does not perform it.
OPERATING PRINCIPLES
Top View
Bushing
Paper Eject Roller
Figure 2-6. CR Lock Mechanism
Overview
Right Side View
CR Lock Lever
Middle Frame
Revision B
40