Epson FX 890 - B/W Dot-matrix Printer, Service Manual

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FX-1180/FX-880 Service Manual
Chapter 2 Operating Principles
Rev. B 2-6
Data from the host computer is stored in the input buffer once, then converted into image data and
transmitted to the printhead through the gate array, as shown in the figure below:
H o s t c o m p u t e r
C P U
P r i n t h e a d d r i v e r
c i r c u i t
P r i n t d a t a
c o n v e r s i o n
I m a g e d a t a
t r a n s f e r
I n p u t b u f f e r
I m a g e b u f f e r
R A M
G a t e a r r a y
D a t a l a t c h
a n d
d a t a o u t p u t
Figure 2-6. Data Flow