Specifications

LQ-2080 Revision A
Operating Principles Control Circuit 23
2.3 Control Circuit
The control circuit consists of the C273 Main Board assembly and C165
PNL board This section describes the major components and explains
how the boards work.
IC 7 (not m ounted)
IC 6 (C G -R O M )*1
IC 8 (1 M P S -R A M )
C N 15(P N L board)
C N 1 ( P a ra lle l I/F )
CN2 (Type B I/F)
C N 14 (O ption C S F)
CN17 (Fan)*2
CN6 (PE-Front)
IC 4 (TM P 96C )
CN5 (PE-Rear)
CN7 (Top)
CN4 (CRHP)
C N 16(R elease2)
C N 12(R elease1)
CN13(PG1)
IC 2(P S T592)
IC 11(S LA 7024M )
CN11(CR)
IC 12(A 2917)
CN10(PF)
CN3(from PS)
IC 3 (E05B 42)
CN8
Tr.(Q 4-25)
CN9
IC 5(AT93C 45)
Address
IC 1 0 (P -R O M )*1
Data
*1: R efer to the C hapter 1 / M ain C om ponent / Table "R elationship betw een the Program R O M and C G ".
*2 :
C N 17 on the m ain board is not used because pow er for driving the C ooling Fan is supplied
from the pow er supply board. Therefore, C N 17 is not used.
Figure 2-1. Control Circuit Block Diagram
2.3.1 Overview of Control Circuit Operation
The printer's control circuit includes a TMP96C041BF CPU
that runs at 19.66 MHz, an E05B24YB gate array, a 1M bit
PS-RAM (8-bit bus, less than 100ns), a bit PROM (8-bit bus,
less than 100ns), CG (Standard Version) or CG (NLSP
Version). It oversees control of all the components in the
printer. The following chart shows you a block diagram of the
control circuit.