7. PRINTER control circuit
1)Block diagram
Fig. 7-1
2) General description of the printer controller
The DP-730 is used as the R/J printer. The printer mechanical timing
control is made by the CPU through MPCA6.
3) Printer motor drive circuit
When the MTD is high, the motor rotates.
When the MTD is low, the motor stops.
<Motor lock protection>
When an abnormal load is applied to the mechanism, the DP (Dot
Pulse) frequency is checked to prevent against the motor burn-out,
the timing belt shift, and gear damage. If the following condition is
made, the CPU stops the motor rotation.
1
When starting the motor: When the cycle from starting to the
100th pulse of DP is 16ms. (The one pulse cycle of DP is normally
555us.)
2
During constant rotation of the motor: When one pulse of DP is
1100us or more.
4) Printer sensor circuit
The printer supplies the RP (Reset Pulse) signal, the HP (Home
Position) signal, and the DP (Dot Pulse) signal) to control printing
timing and conduction timing of solenoids. It also supplies the VPJ
signal to detect the presence of validation paper. These sensor are
photo interrupters.
1
RP (RJRST) signal
This signal is outputted once for every reciprocating motion of the
print head. It indicates the reference position of the HP signal.
The rear edge of RP (OFF -- ON) is used as the signal.
2
HP signal
The pulse signal is outputted from the slit in the disk installed to
the DC motor shaft. It is used as the reference signal for starting
counting of the DP signal. It is generated once for twenty DP
signals. The rear edge of the HP signal (ON -- OFF) immediately
after generation of the RP signal is used as the signal.
3
DP (RJTMG) signal
The pulse signal is outputted from the slit in the disk installed to
the DC motor shaft. It is used as the control signal for the print
solenoid and the paper feed solenoid.
The front edge of the output signal (ON -- OFF) is used as the
signal.
4
VPJS (VPJ) signal
The presence of a validation card is detected by interruption of the
photo interrupter LED light by the validation card.
CPU
Data
bus
MPCA6
DRIVER
PRINTER
(DP-730)
RECEIVER
Address bus
MTD
MPCA6
M
Speed limiter
circuit
R59
R93
+24V
C105
Main PWB side
Printer side
R92
COM
Q113
C87
MTD
DP
DP
Normal 555µs (516~590µs)
R60
Q8
C82
+5V
R61
R62
HP
HP
+5V
R63
Q9
C3198
C83
+5V
R64
R65
RJTMG
DP
+5V
C84
+5V
RJRST
RP
+5V
VPS
VPJS(NU)
+5V
R88
R68
MPCA6
CPU
R66
OFF
ON
555µs(TYP.)(516~590µS)
#1 #2
#3
#4
+5V
GND
+5V
GND
ON
ON
+5V
GND
OFF
OFF
RP
HP
DP
Relation ship among RP/HP/DP
1.5ms or above
The first HP after turning
OFF/ON RP.
20 cycles of DP (TYP.11.1ms)
50µs above
50µs above
Print area
* The waveforms are those indicated with arrow in Fig.3-3.
– 25 –
Содержание ER-A460
Страница 49: ...2 Main PWB layout 48 ...
Страница 57: ...13 Keyboard PWB layout 56 ...
Страница 60: ... Top cabinet etc ER A460 I 34 RCPSO082 2 ...
Страница 62: ...ER A460V Top cabinet etc ER A470 RCPSO083 4 ...
Страница 64: ... ER A460V 9 RCPSO084 6 ...