Epson 680Pro Service Manual - Page 38
Ink System Mechanism, 2.1.6.1 Pump Unit & Wiper mechanism
UPC - 010343832138
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EPSON Stylus COLOR 680/777/77i Revision B 2.1.6 Ink System Mechanism Ink system mechanism consists of pump unit (include the CR lock lever) and capping mechanism. Ink system mechanism drives the pump unit that presses cap to the printhead and ejects ink from ink cartridge, head cavity and cap to the waste ink pad. 2.1.6.1 Pump Unit & Wiper mechanism The pump unit is driven by PF motor. PF motor drive is always transmitted to the paper feeding mechanism and pump unit through the following gears. Refer to the Figure 2-13. PF Motor Pinion Gear (CW) → Combination Gear 16, 21.6 (CCW) → Spur Gear 73.6 (CW) → Spur Gear 15 (CCW) → Combination Gear 37.6, 44.4 (CW) → Spur Gear 36.8 (CCW) → Combination Gear 9.6, 24 (CW)→ Pump Unit Gear (CCW) The Pump unit and Wiper mechanism drives according to the PF motor rotational direction, as shown in the right table. Table 2-4. PF motor rotational direction & Ink System Mechanism Directions Functions Counterclockwise (*1) Clockwise (*1) • Sets the wiper. • Absorbs ink by the pump unit • Set the CR lock lever • Resets the wiper. (*1): The PF Motor rotational direction = seen from the right side of the printer. Following figure shows the overview of the pump mechanism operation. Figure 2-12. Pump mechanism Capunit Spur Gear 15 Combination Gear 9.6, 24 Combination Gear 37.6, 44.4 Wiper Pumpunit CR lock lever Pump Unit Gear Spur Gear 36.8 Figure 2-13. PF motor drive transmission path to the Pump unit Operating Principles Overview 38