Service manual

Principles of Operation
Gate array E05A02 in the printhead drive circuit
The E05A02 gate array includes circuitry to interface the CPU and the printhead.
This general purpose gate array has special commands that lighten the CPU’s load
during printhead data output.
Figure 2-47 is a block diagram of gate array E05A02.
Gate array operation centers
around the three 8-bit data latches. The gate array also supports functions
(commands) that can efficiently write data to any of the data latch bits.
Figure 2-47. Gate Array E05A02 Block Diagram
2-49