Pcb SRANPRIZ is the printer board
containing a cenh-dl processing unit.
31
1-034
Schematic diagram
Component layout
NG
AND
AD
in chapter
"TESTING
mask progamed processor
80C49
(Dl).
Parallel data is input to the CPU's port PI
through the handshake of a simplified
centronic system containing S
READY signals.
Data is set in the bus,
TROBE
is set low, the
GPU sets the
READY
signal high duringread
operations and new datacannot be transferred
until
READY
goes low.
The length of the data buffer is set by GPU
pins 21,22 and
23.
When pins 21 and
23
are
connected to ground and pin 22 is not, the
length of the data buffer is set to twentyfive
charactersonpaper, therefore thelast character
(25th) must
be
[CR].
When the data for a line
is input, or [CR] code is entered, the printer
rinting. Before the operation begins
the program checks the position of the head-
carrier, if it
is
not at the
RQ
only one feed is performed.
ntrois, via wansistor
256,
the printermotor
as well as the seven thermal printing heads.
The tachogenerator (TG) signal isoutput from
a signal generator directly connected to the
motor. The
TG
generates an artificial sine
wave of 2 cycles per one turn. The signals arc
converted into rectanplar printing timing
sigaals by the
TG
signal waveform shaping
circuit
(V6).
TheHomeSwitch Signat
(HOME
SW)detects
the home position of
the printer.
signal is in the high state, the printer is in the
home position.
The hardware reset to pin
4
resets the
CIPU.
This occurs when the supply voltage
momentarily goes low.
Thedensity of thecharacters on themalpaper
is adjusted with the
fre
uency coming to
CPU9s pin
49.
Document Release Section Page
e
3511352-100-x
2.0
a
3
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