Epson LQ-2550 Technical Manual page 224

b) In the self test: Using a color ribbon
n d colar r i b b o n cortridge.
power is turned on,
then turn the power off.
I
Perform the self test.
color printing (viol et, or Of198.
d green), are printing Posltlo
switching performed correctly
Confirm whether the CS unit operates correctly by observing the up and down movement of the
color ribbon cartridge and rotational noise of the CS motor.
Replace
the CS unit.
.
Align the printing
positions for
bi -directional
print ing. Refer
5 - 1 2
Replace
the printer mechanism.
I
the ROMA board.
I
v
.