Power Supply Operation; Power Supply Overview - Epson LQ-300 Service Manual

Operating Principles

2.2 POWER SUPPLY OPERATION

The printer can be powered by either of two power supply boards: the C130 PSB (120 V) or 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.
Board
2.2.1
Power Supply
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)
2-10
Table 2-6. Power Supply Board
Input Voltage
100.5-132 VAC
198-264 VAC
Overview
CR motor drivers
PF motor drivers
Printhead drivers
CS motor drivers
Main board assembly logic circuitry
Various sensors
Control panel LED
PF motor/ CS motor hold
Fuse F1 Rating
2.5A 1125 V, 250 V
1.25 A 1250 V
Applications
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