Printer Drive Ic - Sharp PC-1600 Service Manual

Pin
Symbol
No.
42 107N
43 CSNO
44~51
DBO ~ DB7
PAOl ~ PA51
52
~
57
60 PA61
GND
58
(NC)
59
61 PA7B
PA6N
62
64 PA71
(NC)
63
3-2. Printer drive IC (LB-1247)
vcc
I
F rom gate a"av
--, I" •
IN
ULOW
Driver
As shown above, the output transistor within the driver is
turned active in the period that the driver input signal
(signal from the gate array) is low level, so that current
flows across the load connected to the output terminal of
the driver. Fig.7 shows the equivalent circuit of the driver.
(Fig.7) Driver (LB1247) equivalent circuit
Active
1/0 Level at reset
level
(High)
Out Low
(High)
Out Low
ln/Out
In Low
Out (High) High
(Out) (Low)
High
In
VP
~ ~ Load
VDD VCCI VCC2
2.5" FDD select signal.
(Out through the address 70H - 7FH)
32KB ROM select signal.
[ ELH, MREG, PT , • • •.
PU .....•....•..
Address ..........
(PV ... Low; printer, High; FDD, CMT)
(8-bit) data input/output,
Input port (port address: 81 H).
(PAO ~ 61 correspond to 00 ~ 6.
(Interrupt controlled by F F1 (address: SOHl outputs GO ~ 6.)
Power supply.
CMT I/F circuit outpur.
(The cassette signal that has been amplified and waveform shaped is
sent from this line.) (See Fig. 6.)
Comprise an amplifier when a feed back resistor is connected across
PA7N and PA71. (See Fig. 6.)
(Input signal is given from PA71.)
- ------- -- -----
Eight circuits shown in Fig.7 are contained in a single driver
circuit. The driver 1 is sued for driving of printer X and Z
motors and the driver 2 is used for driving of printer
motor and and remote relay. (Two circuits are not used for
the driver 2.)
==:J
PB4N IN6
F<~ {
ga ••
array
PB5N INS
LI"
(Fig.8) Remote circuit
To increase the torque of the printer Y motor, a SV zener
diode (HZSCl) is inserted across two VCC2 (which con-
tains reverse surge absorb diode) of. the driver 2.
3-3. Printer (PTMPG3308A)
The PTMPG330BA ball point pen type, 4-color, plotting
printer consists of three. stepping motors which are used to
control the direction
direction Y (vertical pen movement),
(pen up/down and color
coils of A, B, C, and D. The CR detect switch is attached to
the left side of the printer for detection of a CR via the pin
PA51 of the gate arrav. The X and y motors are 1-2 phase
excited and the Z motor 2-2 phase excited.
See Section 7, Printer, for detail of PTMPG3308A printer
spedfications, characteristics, drive method, etc.
-n7-
-
P C-l600
Description
H;gh ]
Low
4000H ~ 7FFFH
Romote
OFF ON
REM
3
.!fu o
~
Driver 2
I ""
OUT5' RRv
:ll
OUT61 RRY OFF
Relay
-U-
X (horizontal pen movernent), the
and the direction Z
Each motor is driven
chanqe),
Y
-0'
by