Removing The Board Assembly - Epson Stylus Color 640 Service Manual

EPSON Stylus Color 440/640/740

4.2.2 Removing the Board Assembly

Since the main board and power supply circuit board are built in a
separate bracket from the printer mechanism, remove the whole
bracket from the printer mechanism.
NOTE: The main board and power supply board equipped with each
printer are as follows
- S tylus Color 440:C206MAIN-B, C255 Main, C206PSB/PSE
- Stylus Color 640:C256MAIN, C206PSB/PSE
- Stylus Color 740:C257MAIN, C257PSB/PSE
1. Remove the housing.(Refer to 3.2.2)
2. Remove the 5 screws(No.1) securing the "M/B Shield plate" on the
printer mechanism.
3. Pull out the "M/B Shield Plate" a little bit and remove cables which
are hung on the A and B holders as you can see in the figure below.
Then, take all cables out of connectors on the main board.


Stylus Color 440, 640:
CN11 black, CN4 yellow, CN5 white, CN3 black, CN6/7 white,
CN8 FFC black


Stylus Color 740:
CN11 black, CN4 white, CN5 yellow, CN6 black, CN 7/8 white,
CN9 FFC gray
4. After removing all the cables from the main board, detach the
"Shield plate M/B" completely from the printer mechanism.
5. When removing each board unit from the "M/B Shield plate", remove
the screws securing each unit and shield plate. [main board: 10
screws (7 No.1 screws, 3 No.6 screws), power supply board: 4
screws (No.1)] Refer to the next page for the figure. Also, when
removing the power supply board, remove the cable connecting to
the main board (CN6 with lock device).
Chapter 4 Disassembly and Assembly


Since the connectors CN 6,7,10(for 440, 640) and
CN7,8,10(for 740) have connector locks, be sure to
release the locks before removing the cables. Also,
make sure to lock when connecting these cables.


When connecting cables to the connectors, the
cables never cross with each other in this printer. So,
if there are two connectors sitting next to each other,
the cable on the right should be connected to the
right connector and the cable on the left should be
connected to the left one
Be sure to perform the following adjustments when the
Main board is replaced;
1. Head voltage ID Input (Refer to Chapter 5.)
2. Bi-D adjustment (Refer to Chapter 5.)
Revision A
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