Epson Stylus Pro 4900/Epson Stylus Pro 4910 Revision A
DISASSEMBLY & ASSEMBLY Overview 101
Confidential
W A R N I N G
The power switch for this printer is installed on the secondary
side of the power circuit; therefore, the power is always
supplied unless the AC Cable is unplugged. To prevent electric
shock and circuit damage during servicing, make sure to follow
the instructions below.
• Before removing a circuit board, make sure to unplug the
AC Cable from the AC outlet and confirm the LEDs are
turned off by pressing the Power button on the Operating
Panel. This operation discharges the residual charge in the
printer.
• Make sure not to place the removed circuit boards on the
metal and such directly.
Always wear gloves for disassembly and reassembly to avoid
injury from sharp metal edges.
Never touch the ink or wasted ink with bare hands. If ink comes
into contact with your skin, wash it off with soap and water
immediately. If irritation occurs, contact a physician.
If ink gets in your eye, flush the eye with fresh water and see a
doctor immediately.
When powering this product, high-voltage current may be
applied on the following parts/components. To prevent
ELECTRIC SHOCK, do not touch the parts/components when
the power is ON. If the shock should happen, the flowing
current is very tiny, about a few hundreds μA, therefore it will
not do any harm on the human body.
• Power Supply Board Assy
• Main Board
• AID Board
• Roll Unit Connector
When replacing the Main Board, Power Supply Board, or
Power harnesses and such, make sure to check visually if any
harness is caught in between or any wrong connection exists.
C A U T I O N
Locate the printer on a stable and flat surface.
Use only recommended tools for disassembly, assembly or
adjustment of the printer.
Apply lubricants and adhesives as specified.
Be careful not to soil the printer or the floor with the leaked ink
when removing the ink-path-related components or parts.
Spread a sheet of paper or cloth on the floor in advance.
Do not touch electrical circuit boards with bare hands as the
elements on the board are so sensitive that they can be easily
damaged by static electricity. If you have to handle the boards
with bare hands, use static electricity discharge equipment such
as anti-static wrist straps.
When the printer has to be operated with the covers removed,
take extra care not to get your fingers or clothes caught in
moving parts.
When you have to remove any parts or components that are
provided as after-service-parts but are not described in this
chapter, carefully observe how they are installed and make
sure to remember it before removing them.
Disassembling the frame and some components (platen, PF
shaft) of the printer is prohibited because they are assembled
with precise measurements in 1/100 mm unit at the factory.
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