Table of Contents
Advertisement
Piaten.
°,
_, Paper
Return spring
7 Solenoid
4
Actuating plate
Fig. 16-(b)
5-9-6:
Dot solenoid driver (solenoids 1 ~ 7)
Vp(+24V)
{
<2
4 Dot wire solenoid (4)
¢
x
Diy o==7
ly f Spark killer
& DOT2 ~ DOT) circuits are the
samie as the DOT circuit:
al
{Timing signal)
+5V
—boT!___
{DOT2~DOT? ) |
i
'
'
f
i
GND
:
'
'
'
'
i
1
1
'
!
'
+5V
Point @
,
:
,
ri
H
GND
'
:
'
'
'
1
:
t
GND
}
+24V
DT
.
GND
OFF
| ON
OFF
ON
|
OFF
| ON.
OFF
Q15
;
t
s
'
Solenoid is energized,
Fig. 17-(b)
©: The DOT
1:is issued' by the:printer controller as a low.
@- The low will..be inverted toa high (point (@)) which will
be felt by the'bese of O15;
®
Q15 turns on and supplies the dot wire solenoid with
the ground needed for current flow.
®
Current flows throtigh solénoid > solenoid énérgized.
NOTE:
When
thé soleridid becames
de-energized, the
spike' (ptoduced' by the collapsing
magnetic
-
"Field arouirid the solenoid) will be absorbed by
thé: resistor' and' capacitor with is connected
betweeri emitter and collector of O15,
®
Solenoid' failure prevention circuit. Even if the signals
DOT1'~ DOT7 aré Kept at-a low level continuously by
circuit trouble; the solenoids are not kept on at a full
"voltage level, which could lead to solenoid failure.
BE#2520
DOT! & Kept at 6 low level by cireuittroubles
Q15
is turned on only
for this time.
5-9-7. Print reset signal (R) reveiver
+5V
'
\
R-SW
at
(in the printer)
Spike killer
Vp (+24V)
+5V
Paper Feed Magnet
Fig. 20
© The printer controller will issue the PFJ signal as a low.
@
The low will be inverted to a high which will turn Q14
on.
@
With 014 on, a ground is provided for current to flow
through the paper feed magnet.
®
Current (lon) flowing through the magnet will cause the
magnet to be energized and paper feeding will occur.
@
After
completion
of a single
Jine
feed,
the
printer
controller will issue the INT low to inquire whether
further paper feed is required or not. The CPU will then
send out a paper feed continue/discontinue command to
the printer controller.
5-11. Paper end sensor
+5V_
+5V_
forse
"d|29>"2
PAE
Xe)
PEND
(paper end}
Lada
PE-SW
pe
(In the Printer)
Fig. 21
Advertisement
Table of Contents
