Epson LQ 1050 - B/W Dot-matrix Printer - Filter Circuit; Transformer

REV.-A
2.3.2.1 Filter Circuit
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The AC line voltage passes through the power switch, then is input to the filter circuit. A fuse, F1, is ““
used on the PEBFIL-11 board. The filter circuit attenuates external noise and inhibits noise generated
in the printer from going out via the AC line. Either C 1 or
C2 drains leakage current between the primary
coil and the case. Figure 2-1 1 shows the filter circuit.
O&fi-C&.,
LI 800}H
1
.—————— . I 1 “) 1
L
J
ii
I
1]
-—
( 22~/240V Version Only)
F 1
:
2A 125V ( iOOV Version
2A
125V ( 120V Version
1.25A 250V
(220/240V
)
)
Version)
Figure 2-11.
PEBFIL-11 Filter Circuit Board
2.3.2.2 Transformer
AC Voltages(120
VAC, 220 VAC, 240 VAC) that pass through the filter circuit are divided into 26 VAC
and 12 VAC and supplied to the PEGX circuit. Figure 2-12 shows a schematic drawing of the power
transformer.
FRlb4ARY
IZO vAC ~
ORAY 7F
S0/00 Hz
WHITE
o v~
2ECOtOARY
FRIMARY
E
red
27.6 VAC
red
c
blue
8.3 VAC
NW
240
VAC
3
ORANOE
wow
220 VAC
S0/00 HZ
BLLE
Ov
E
red
27.6 VAC
red
E
blw
8.3
VAC
blw
TF
IZOV Verslan
ZZO/240 V Varslm
Figure 2-12 Transformer Circuit
2-16
,.