LQ-2180 Revision A
Operating Principles Control Circuit 25
2.1 Control Circuit
The control circuit of the LQ-2180 is composed of the C272MAIN board
and the C165PNL board. This section describes the operations of the
major components in the circuit.
2.1.1 Overview of the Control Circuit Operation
The printer's control circuit includes a CPU (TMP96C141AF/IC4) that
runs at 19.66 MHz, a gate array (E05B42/IC3), a 1M bit PS-RAM (IC8),
a 8M bit CG-ROM (IC6), and so on. The figure below shows the block
diagram for the control circuit.
Figure 2-1. Control Circuit Block Diagram
The following figure shows the data flow from the host computer to the
printhead. Data sent from the host computer is converted to image data
and transmitted to the printhead through the gate array.
Figure 2-2. Data Flow
IC 7 (not m ounted)
IC 6 (8 M C G )*1
IC 8 (1 M P S -R A M )
C 165 PN L board
C N 1 (P a r a lle l I/F )
C N 2 (Type B I/F)
CN14 (Serial I/F)
C N 17 (Fan)
CN6 (PE-Front)
IC 4 (TM P 96C )
CN5 (PE-Rear)
C N 7 (Top)
CN4 (CRHP)
C N 16(R elease2)
C N 12(R elease1)
CN13(PG1)
IC 2(P S T 592)
IC 11(S LA 7024M )
CN11(CR)
IC 12(A 2917)
C N 10(P F)
C N 3 (fro m P S )
IC 3 (E05B42)
CN8
Tr.(Q 4-25)
CN9
IC 5(A T93C 45)
Address
IC10 (8M P-ROM)
*1: O nly for Korea and Thai versions
Data
Print data
conversion 2
CPU
TM P 96C 141
RAM
G a te A rra y
E05B42
Printhead drive
circuit
In p u t
B u ffe r
Im age
B u ffe r
Line E dit
B u ffe r
Print data
conversion 1
D a ta la tc h
a n d
data output
Im a g e d a ta
tra n s fe r
O ption I/F
P a ra lle l I/F
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