Specifications
REV.-A
f
2.3 CONTROL
CIRCUIT
OPERATION
The control circuit consists of two boards: the C107 MAIN board, which acts as the main board, and
the
C062
PNL board, which acts as the control panel board. This section describes how these boards
work.
2.3.1 Control Circuit Operation Ovewiew
The printer CPU is an 8-bit CPU
TMP90C041
running at 10 MHz. It oversees control of all the
components of the printer. The E05A50 gate array contains various memory management
ftinctions
that control the assignment of the
memoty
and l/O areas, and it controls a head gate array
IC2
(E05A86),
a
PU1501
or STK-67129 for the PF and CR motor driver,
STA475A(IC4
-
IC9)
is transistor
array for the head pins drive, several sensor circuits and so on.
Figure 2-17 shows
the
block diagram of the
C107
Main Board.
C062PNL Board
Card
Panel
I
C107MAIN Board
~
,
-1----”:”--------——
. . . . . . . . . . . . . . . . . .
-.. -.. —.. —..
GateArray
E05A50
. . . . . . . . . .,
(Icll)
PROM
P:5s
psM~M
MROM
MROM
:
Opdon
I/F
}
. .
512K
. . . . . . . . . . .
(IC14)
(IC15)
(IC16)
(I%)
(lfi8)
Vref
Circuit
I
i
I
I
I
I
I
a
CPU
TMP90C041
(IC21)
1
I
(
+
L-
STK-6712(IC1O)
CR Motor
L’
E05A66
(IC2)
Prfnthaad
STA47SA
(IWIC9)
:-
”-”---:
;
1+~
I
‘~.
“.
. . . . . . . .
I
%F
PFMotor
1
+
v
v
DETECTOR
ASSY.,
D~~OR
DmcroR
ASSY.,
HP
ASSY.,PE,REAR
RELEASE
Head
DETECTOR
D151ECTOR
ASSY.,
Thermiater
ASSY.,PE,FRONT
PLATEN
Sanaor
CR Motor
PF Motor
DETECTOR ASSY.,PE,FRONT
DETECTOR ASSY.,PE,REAR
DETECTOR
ASSY.,HP
DETECTOR ASSY.,PLATEN
DETECTOR
ASSY.,RELEASE
TH2
:
Carriage Motor
: Paper Feed Motor
: Paper End Sensor(Front)
: Paper End Sensor(Rear)
: Home Position Sensor
: Platen Gap Sensor
: Release Lever Position Sensor
: Therrnister Sensor
Figure 2-17. Control Circuit Block Diagram
2-13