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CE-1600E
9-2. Centronics interface
Fig. M54514AP
driver equivalent
Seven above circuits are implemented on a single chip of the driver
and two chips are used in the CE-1600E. Among 14 circuits (7
circuitsx2), 8 circuits are used lor data output and 4 tor STROBE
and INIT outputs, 1 for BUSY input, and remaining one circuit is not
used.
G) Data output
From gate array ~
~OW
®
STROBE, INIT outputs
Because both signals are active low and the gate array goes
high during reset, a non-inversion butler is provided between
port and Centronics interface.
--'M---l
From gate array
WLOW
To prevent malfunction at power on and oft, a pull~ resistor is
inserted to PB6N.
®
BUSY input
When the printer is not in connection, a pullup resistor is used
to set it in the busy state. A diode is used to prevent intrusion
01the power supply when oft.
,
I
,
I
I
I
~CE-1600E
To printer ___.)
9-3. Power supply circuit
VP, VBAT circuit
AC
__/jl
aoapter,
about 9.4V
SUM3x5
,
r
,
D6
{>!
01:
For prevention of counter current flow from the battery to
the adapter.
D2, 03: To drop the voltage from the adapter to the f10PPVdiskdrive
voltage, 7.5V, maximum.
04:
For prevention 01 counter current f10w from Vß A T
unit) to VP (Iloppy disk).
05, D6: For prevention 01counter current flow to the battery when
the adapter is in use.
circuit
:-, r,
L..J
,
I
CE-1600E___.)
LO",,' ~
D3
D2
N
....Vp
N
•
•
,
D4
.. VBAT
L-.{>I
J
Dl,D5,D6
nOOO3
1O,EIN
D2,D3,D4
CE-1600E
VCC4-~----+--------------'
After the batlery power supply is ORed with VBAT of th
CE-1600E, VCC is regulated to 4.7V before supplied to th
CE-1600P. (See the figure below.)
When the main power is off, VCC is not supplied.
9-4. Low battery detect circuit
CD
VP low banery detect circuit
The MN1280Q low batlery detect IC is used in the VP low low
batlery detect circuit. (Rank Q=VDL: 3.8-4.1V)
VOUT must be inverted in the comparator before supplied to the
gate array.
pnnteer
To
Vp
MN1280Q
1.1-2.4V
®
VP, VCC comparator circuit
As it is necessary to satisfy the condition of VP>VCC+01V in
order to 5VC inside the CE-1600F, the condition is monitored
by means 01the comparator.
5KO
(Potentiometer adjusting method)
1) Add 4.5 to 5V to the VCC pad.
2) Add VCC+O.1V to the VP pad.
3) Rotate VR counterclockwise and set the LBtest pad vohage to OV.
4) Slowly rotate VR clockwise and stop it when the LB test pad
voltage came to be VCC. (See the parts and signal description
(main
lor the location 01test pad.)
-~-
PC-16 0 0
-=-UM-3
-
(X4)
ifr
V OUT
MN 1280
output characteristics
vo:
VOUT
>
•
VP
>
t
(*u: )
VC
To gate array
PAI I
100KO
To gate array
PA21
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