EPSON Stylus COLOR 440, 640, and 740
1.8.4 C257 MAIN Board (Stylus COLOR 740)
The C257 MAIN board controls the operation of the printer mechanism
and data processing operations for the Stylus COLOR 640. It consists
of the following major components.
Figure 1-14. C257 MAIN Board
1.8.5 Power Supply Board
C206 PSB/PSE (Stylus COLOR 440 and 640)
C257 PSB/PSE (Stylus COLOR 740)
The power supply boards for the Stylus COLOR 440, 640 and 740
employ a switching regulator method to supply stable logic and power
voltages. Because these boards contain a time delay circuit, electricity
can be supplied to the printer for at least 30 seconds after power is
turned off. Therefore, even when the user makes a mistake (for
example, turns off power in the middle of a print job), this mechanism
ensures that the printhead is capped and prevents ink from clogging the
nozzle plate.
Q1(FET)
Fuse(F1)
CN1
Filter(L1)
Figure 1-15. C206/C257 PSB/PSE board
Chapter 1 Product Description
C51
Trans(T1)
CN2
PC1
C11
IC51
32