Epson DFX-8500 service manual Printhead Mechanism

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 back (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
GND	Mask Holder (Cutting)
		Platen Assembly
	Dot Wire

Iron Core

Printhead Drive Coil Ribbon

Figure 2-4. Printhead Mechanism

2-4 Rev. B