Specifications
REV.-B
2.3 CONTROL CIRCUIT OPERATION
The control circuit consists of two boards: the
C062
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 Overview
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 functions
that control the assignment of the memory and
1/0
areas. Rationalization and simplification of the
circuitry is achieved through use of the
STK-6022B,
which holds all the driver circuits for driving the
PRINTER MECHANISM on a single chip. Figure 2-17 shows the control circuits in block diagram form. I
C062
PNL
Board
~
-------
-{
I
Control
I
{
Panel
:
1
1
‘1
1------
--
J
C062 MAIN Board
~ ---------- ----------------------------- -------------------------
-----------.
1
1
1
1
8
8
I
t
I
I
1
,
1
1
I
I
I
1
1
GA “
Parallel
l/F
E05A50
(4D)
~
d
~
--------,
I
Option
1
:
l/F
:
I--------
J
1
1
1
1
1
1
1
1
1
1
1
1
I
t
1
1
1
1
--
❑
Vref
Circuit
---------.
,---
—
EEPROM
(4C)
I
1
PROM
5 12K
(5 E)
-----------
I
7
I
X
136 column
[
~
only
1
t
I
1
I
I
1
1
1
1
1
1
9
I
1
I
1
1
PSRAM.
;
PSRAM
:
MROM MROM
:
256K
:
64K
;
8M
1
(6E)
,
( 1 E)
;
(3E)
~?E)
;
!
1
I
t
1
1
L-----
.----d
!
1
1
1
1
1
1
1
CPU TMP90C041 (lC)
1
I
.
----------------------
--------
STK-6022B (2A)
,----
------------------
--------
1
1
1
1
1
I
I
I
~-----
-------------------------------------------
-------------------------------,
I
1
I
I
I I I
I
1
:
PRINTHEAD MOTOR, CR MOTOR,
P.F
DETECTOR AS
SY.,DETECTOR
ASSY.,
DETECTOR
ASSY.,
DETECTOR
ASSY.,
DETECTOR
ASSY.
j
I
I
HP
PE, FRONT
PE, REAR
PLATEN
RELEASE I
1 ---------------------------- ------------------------- ---------------------- ----
-1
PRINTER MECHANISM
GA
Gate array
DETECTOR
ASSY.,
HP Home position sensor
DETECTOR
ASSY.,
RELEASE Platen gap sensor
MOTOR, CR
Carriage motor
DETECTOR
ASSY.,
RELEASE Release sensor
MOTOR, PF
Paper advance motor
DETECTOR
ASSY.,
PE, FRONT Front paper-out detector (positioned in front of the PRINTER MECHANISM)
DETECTOR
ASSY.,
PE, REAR Rear paper-out detector (positioned behind the PRINTER MECHANISM)
Figure 2-17. Control Circuit Block Diagram
2-13