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FO-145A
(2) PaneI control block
The following controls are performed through G.A. according to com-
mands from the main CPU.
Operation panel key scanning
Operation panel LCD display
(3) Mechanistirecording control block
Recording control block diagram (1)
IC5 G.A. (LZ9FJI 1)
-----------------------------------------------
-------------------,
t
I
p~s
~onversion f
7
1
1
DMAcontrol
L Recordingdata
1
1 ,
block
\
control
block
I
'1
<
1 I
)
---
1
I
t
1
1
1
I
t
I
1
Thermal head
t
I
1
IC2
CPU
(Z80180)
1
t
t
1
1
1
I
DREQ
I
<)
I
I t
Register
\
control block
I
1
m
t ,
[
I
I
I
I
i
I
I
i
Interruption
L
1
control block
I
I
1
1
I
I
t
I
1
1
I
;'A
M otor control
1
t
I
I
1
8
\
Motor control
> Motor
1 t
UT
I
block
I
I
#
,
1
II
1
I
1
I
I
I
\
Plungercontrol
I
+ Plunger
/ block
1
1
8
I
t
1
t--------------------------------------------------------------------
Fig. 4
The recording control block is composed as shown above. The de-
Thermal head temperature detecting block
This block converts the thermal head thermistor value into a
digital
value
by
conversion of voltage pulse width for correction of printing
density. (Fig.5)
scriptions are given below:
P/S conversion block, DMA control block, recording data control
block
The recording data is transferred to the thermal head by these
blocks. First, the G.A. sends DREQ to the CPU. The CPU transfers
the recording data to the P/S conversion block by means of DMA.
The transferred data is converted into serial data and sent through
-.
RITT
7;;9
62K
CNUU-21
THI
i
1
Qlol
1 I
THDT ~24,4)
DTC114EK /
I
the recording data control block to the thermal head together with a
clock.
Strobe width control block
(2-4A) 'Tc
1
C123
T
ZOQP
This block controls strobe width which determines the printing den-
*
h
sity of recording by the thermal head. Parameters of printing fre-
quency and temperature are inputted to the CPU to set an appro-
Fig. 5
priate strobe width according to an algorithm. The printing density
is maintained at a constant level in this manner.
This signal is to monitor the data of the thermistor (inside
the
thermalhead) to protect the thermalhead.
Dot counter control block
This block counts the number of black dots in the transferred print-
ing data for correcton of printing density.
Motor control block
This block supplies phase output for control of the TX and RX
motors. With register setting, it controls phase switching timing of
the motor.
5-8
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