Epson 2070 Service Manual - Page 70

CONTROL CIRCUIT, Overview of Control Circuit Operation, Control Circuit Block Diagram

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Operation Principles LQ-2070 Servcie 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. Type B I/F IC 3 ROM IC 5 RAM Q1~Q24 Head Temp. Head Drv. Detector Parallel I/F Panel LED Panel SW Power SW PSC PWDN 5V P/ S GL Unit 35V GP IC2 Gate Array E05B24YA IC 8 EEPROM IC 10 Rest IC IC 12 CR Drv. SLA7024M IC 11, IC14 PF Drv. TEA3718SDP +35V Voltage Detector PE-Rear Detector IC 1 CPU TMP96C041AF PE-Front Detector P-Width Detector Home Detector Release Lever Detector Gap Lever Detector CSF Drv. CSF Detector : Data Bus : Address Bus Figure 2-30 Control Circuit Block Diagram 2-22 Rev.A

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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