Epson LX-810 Technical Manual

REV.-A
Chopping Circuit
c
., ‘:!
A chopper circuit consisting of diode D 1 and coil L1 is utilized at the output stage. If Q1 in ON, the
-,
coil acts as a resistor, and suppresses vic)lent current surges. When Q 1 goes OFF, the stored energy
in the coil generates a reverse starting
current, and current flows via D 1. Thus, the circuit works as a
current stabilizer.
0.4Y3VV
D 1:’33
LP40
l~!126SD
~~ 4 .- 1 T T T
NCNC
K
3:30
1o11
,1::- -Lr
R13
ZBF503
1.5K
-OITA
2W
El
(3A)
R14
93.3K
UPC494C El
Q3
C1815
2
IN+ ;N D. T. CR. O F. B
1
1
R15
IN-IN+
330
1<
R16
19. 6K 3::
1%
2200/1
TrQ 1 Emitter i ~
OFF
~~ OFF ON
OFF
~fq
TrQ 1 Emitter Current
Oiode D 1 Current
Current at chock
coil
——————————————-—-———————-
Figure 2-20. Chopping Circuit
2-18

Epson LX-810 Specifications

General

Print Method	Impact dot matrix
Number of Pins	9
Character Sets	96 characters (USASCII)
Line Spacing	1/6 inch
Paper Path	Rear
Interface	Centronics parallel
Noise Level	55 dB (A)