Epson DFX 8500 Service Manual page 56

DFX-8500
2.1.1 Printhead Mechanism
The printhead is a charge-type, impact dot printhead. Figure 2-4 shows its operation. The dot wire is attached
to the actuating spring at point A. It is pulled beck (left in the figure) by magnetic force when power is applied
and during standby. The magnetic force holds back the actuating spring. When current flows through the coil,
a counter-magnetic field is induced in the coil. Then, the actuating spring ejects the dot wire forward against
the ink ribbon, printing a dot on the paper.
+35 VDC -
,Actuating Spring
I
Printhead Drive Coil
Ribbon'
Figure 2-4. Printhead Mechanism
Platen Assembly
2-4
Rev. A