Ta Filter Unit - Epson LX-810 Technical Manual

P R I N C I P L E S O F O P E R A T I O N
2.2
This section describes the operation of each component.
2 . 2 . 1 P o w e r S u p p l y C i r c u i t
The electrical power required by this mechanism is developed using the TA
a filter and a power transformer) and the TAMA board.
where line noise is removed, and is then set to the transformer, where it is stepped down into two
separate voltages: AC 26V and AC 12V. "The transformer output is sent to the power circuits on the
Voltage
+5 v
+24 V
A block diagram of the power supply circuit is shown in Figure 2-11.

TA Filter Unit

Voltage Applications
Table 2!-2.
Logic circuit voltage
Holding voltage for paper feed motor
Others
Carriage motor drive voltage
Paper-feed motor
drive voltage
Printhead drive voltage
Voltage for the optional l/F
*
S t e p -
down
.
f o r m e r
.
12VAC
I
Power Supply Circuit Block Diagram
Figure 2-11.
The AC input passes first through the filter circuit,
Purpose
— + 2 4
Full-wave
Regulator
— C i r c u i t
I
Circuit
I
+5
Regulator
C i rc uit
rectifier
2-1o
Filter Unit (which combines
I