REV.-A
2.3.1.1 Fuse and Filter Circuit
The AC input from the power line first flows across the power switch and fuse F1. After being filtered
by C 1 and
it is supplied to the primary side of the power transformer via the
noise prevention
circuit. Power line noise (external noise) and internal noise from the printer are eliminated by this circuit.
The value of fuse F1 changes as follows, according to the power supply voltage:
120
version: 125 V or 250 V, 1.25 A
220 V version: 250 V, 0.63A
240 V version: 250 V, 0.63A
Power
F1
Switch
To
of
.
0
Power Transformer
c l
L1
–
AC IN
x 2
–
0.1
C2 = =
To
of
Power Transformer
Fig. 2-3. Filter Circuit
2.3.1.2 Power Transformer
Three types of power transformers, for 240 V, 220 V, and 120 V, are available. The AC voltage from
the filter circuit is transformed to the voltages listed in Table 2-2 so that they can be output to the
regulator circuit (on the
board) at the next stage. The power transformer includes thermal fuses
and TF2.
primary
Secondary Side
To the
Board
Fig. 2-4. Power Transformer
2-4
