Ensuring The Quality Of Disassembled/Reassembled Printer Mechanism - Epson Stylus Photo R340 Service Manual

EPSON Stylus Photo R340/350
2.2 Ensuring the Quality of Disassembled/
Reassembled Printer Mechanism
Removing the Lower Housing from the Printer Mechanism has been basically
prohibited for the conventional low-end printers. Because the Main Frame of those
printers is not so strong that it may be deformed due to the force exerted on it during
removing or reinstalling the Lower Housing. Whenever the Ink System or the PF
Motor of the low-end printers must be replaced, we have recommended to replace the
Printer Mechanism together with the Lower Housing.
However, on the other hand, the Stylus Photo R340/350 require to remove the Lower
Housing from the Printer Mechanism to replace the Waste Ink Pad or the Ink System.
Whenever the Printer Mechanism is separated from the Lower Housing, be sure to
perform the reassembly following the cautions and instructions described in this
section to ensure the quality of reassembled printers.
Cautions on Disassembly/Reassembly of Printer Mechanism
1. When the Printer Mechanism is removed together with the Lower Housing
• Do not hold the CR Guide Plate to lift or move the removed components,
or the CR Guide Plate and the Main Frame may be deformed and
adversely affect the print quality.
• Never touch the CR Guide Shaft and the nozzles on the head.
2. When the Printer Mechanism is separated from the Lower Housing
• Make sure to reinstall the Printer Mechanism to the Lower Housing
carefully observing the correct positions described in the next bulleted
paragraphs.
• Be sure to first remove the Main Frame Support Plate, and then remove
the PF Roller Assy., EJ Roller Assy., and the Front Paper Guide.
• Make sure the tip of the Waste Ink Tube is located at correct position.
• Make sure that the connector cable of the Tray/CD-R Sensor are properly
routed.
• Make sure that the APG gears are properly engaged.
Disassembly and Assembly

Ensuring the Quality of Disassembled/Reassembled Printer Mechanism

Printer Mechanism Positioning Requirements
[Purpose]
Displacement of the Printer Mechanism can cause print quality or any other
troubles. The correct installation position must be ensured by carefully
checking the specified points in relation to the Lower Housing.
[When Servicing]
Make sure there is no gap between the Main Frame and the Lower Housing.
[Tip]
To ensure the correct position of the Printer Mechanism, it must be checked in
X, Y, and Z directions as described below.
[X direction]
• Make sure that the bottom edge of the Main Frame is properly inserted
into the groove on the Lower Housing.
• Make sure there is no gap between the Main Frame and the Lower
Housing.
[Y direction]
• Make sure that the notches of the Main Frame are properly engaged with
the protrusions on the Lower Housing.
[Z direction]
• Make sure there is no gap between the Main Frame and the Lower
Housing.
• Make sure that the Printer Mechanism is properly secured with the four
hooked tabs (two on the left side, one on the right side, and one on the
right front side).
CR Guide Plate Perpendicularity Requirements
[Purpose]
The L-shaped CR Guide Plate supports the Carriage Unit perpendicular to the
CR Shaft. Any deformation of the CR Guide Plate can cause an inclination of
the Carriage Unit resulting in print troubles or a malfunction of the printer, so
the perpendicularity of the CR Guide Plate must be ensured.
[When Servicing]
Make sure to hold the Main Frame by the specified points to prevent it from
deforming.
Revision A
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