Service manual

2.3 CONTROL CIRCUIT
The control circuit consists of the C186 MAIN board assembly and C165 PNL board This section describes
the major components and explains how the boards work.
2.3.1 Overview of Control Circuit Operation
The printer’s control circuit includes a TMP96C041AF CPU that runs at 17.20 MHz, an E05B24YA gate
array, a 1M bit PS-RAM (8-bit bus, less than 100ns) , a 2M bit PROM (8-bit bus, less than 100ns), 4M CG
(Standard Version) or 8M 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.
Gate Array
CPU
CSF Drv.
CSF
Detector
PE-Rear
Detector
PE-Front
Detector
P-Width
Detector
Home
Detector
Release
Lever
Detector
Gap
Lever
Detector
+35V Voltage
Detector
Head Drv.
Head Temp.
Detector
ROM RAM
EEPROM
Rest IC
PF Drv.CR Drv.
Panel LED
Power SW
Parallel I/F
Type B I/F
5V
GL
35V
GP
IC2
IC 1
E05B24YA
TMP96C041AF
Q1~Q24
IC 12
SLA7024M
IC 11, IC14
TEA3718SDP
IC 8
IC 10
: Data Bus
: Address Bus
IC 3 IC 5
P/ S
Unit
PSC
PWDN
Panel SW
Figure 2-30 Control Circuit Block Diagram
Operation Principles LQ-2070 Servcie Manual
2-22 Rev.A