Epson LQ 300 - Power Supply Operation; Power Supply Overview

Operating Principles
L(?-300 Service Manual
2.2 POWER SUPPLY OPERATION
The printer can be powered by either of two power supply boards: the C130 PSB (120 V) or the
C130 PSE (230 V) power supply. These boards are the same as the LX-300’S power supplies. The
two boards function identically, except for a difference in primary circuitry. The power supply
board outputs the DC current necessary to drive the printer control circuits and drive mechanism.
Table 2-6 shows the input voltages and fuse ratings for these boards.
Table 2-6. Power Supply Board
Board
Input Voltage Fuse F1 Rating
C130 PSB
100.5-132 VAC
2.5A 1125 V, 250 V
C130 PSE 198-264 VAC 1.25 A 1250 V
2.2.1 Power Supply Overview
The power supply board has two power outputs for use in the various control circuits and drive
mechanisms. Table 2-7 lists the circuitry and the units that are driven by the two DC output supply
voltages.
Table 2-7. Power Supply Output Voltages and Applications
output supply
Voltage (DC)
+35 v (VP)
+9 V (VL)
Applications
CR motor drivers
PF motor drivers
Printhead drivers
CS motor drivers
Main board assembly logic circuitry
Various sensors
c
,’ ‘%
Control panel LED
PF motor/ CS motor hold
f ‘
. ~.,
..;
..-
2-10
Rev.A