2.3 CONTROL CIRCUIT
The control circuit consists of the C166 MAIN board assembly and C165 PNL board This section describes
themaj or components andexplains how theboards work.
2.3.1 Overviewof Control Circuit Operation
Theprinter’s control circuit includes aTMP96C041AF CPU that runs at 14.74MHz, an E05B13YA gate
array,a 1M bitPS-RAM (8-bit bus, less than 80ns) , a2M bitPROM (8-bit bus, less than 120ns), andother
circuits. It overseescontrol of all the componentsin the printer. Thefollowing chart shows youa block
diagram of the controlcircuit.
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
E05B13
TMP96C041AF
Q5~Q22
IC 12
SLA7024M
IC 11
UDN2917EB
IC 8
IC 10
: Data Bus
: Address Bus
IC 3
IC 5
P/ S
Unit
PSC
PWDN
Figure 2-30 ControlCircuit Block Diagram
Operating Principles FX-2170 ServiceManual
2-22 Rev.A