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Stylus C40UX/C40SX/C20UX/C20SX Revision A
Operating Principles Overview 25
2.1 Overview
This section describes the operating principles of the printer mechanism and electrical
circuit boards. The Stylus C40UX/C40SX/C20UX/C20SX has only the following two
circuit boards:
Main board: C413 MAIN/MAIN-B
Power supply board: C417 PSB/PSE
2.1.1 Printer Mechanism
The printer mechanism for Stylus C40UX/C40SX/C20UX/C20SX is designed newly.
But, the basic component of the printer mechanism is same as previous product.
This printer consists of Print Head, Carriage Mechanism, Paper Feeding Mechanism,
Paper Loading Mechanism, Ink System (Pump Mechanism, Cap Mechanism, and
Carriage Lock Mechanism).
Like other EPSON ink jet printers, the Stylus C40UX/C40SX/C20UX/C20SX is
equipped with two stepping motors; one for ASF, Paper feeding/ Pump mechanism,
and one for CR mechanism. ASF unit uses rear entry front eject system. This ASF unit
is also designed newly and single LD roller loads the paper to the printer mechanism.
For cap assembly, Stylus C40UX/C40SX/C20UX/C20SX uses valveless mechanism;
new design for this model.
Figure 2-1. Printer Mechanism block diagram
ASF Hopper Spring
Pump unit
Paper feed back plate
Paper separation pad
Clutch mechanism
CR unit
PF Roller
HP/PE/IC Sensor sensor
LD Roller
Cap Assembly
PF Motor
Star Wheel Roller
CR Timing belt
CR Motor
Paper Eject Roller