Sam4s ER-150, Service Manual

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7 Block Diagram
7-2 SAM4S ER150
7-2 Power Block
7-2 A. Power Circuit
This machine has two different power sources, one as a power. Circuit and the other is a battery source. The Power circuit
generates the five levels DC voltage sources. There are 5.3V for the logic, AC 4V and DC -30V for the VFD driving, +6V
for the drawer opening control circuit. The two AA size batteries apply +3V to the Back Up circuit.
7-2 A-(a) VRAW (+6)
The VRAW voltage is used to the source voltage of the drawer driving circuit, and the input voltages of the other different
power sources. The AC 5.6V is rectified by the Bridge diode rectifier 2KBP02 and it is regulated by the Capacitor 4700uF.
7-2 A-(b) VPR (+5.2V)
This is the source voltage of the printer, Epson Model-42III. The most parts of VRAW inputs the printer driving circuit
through the diode 1N4001, is regulated by the capacitor 25V 4700uF, and it inputs the DC-DC converter circuit.
7-2 A-(c) VF1, VF2, VLG, VDSP
These voltages are generated by the DC-DC converter circuit. The VRAW energy flows into the capacitor C2 through the
diode 1N4001, is regulated by the capacitor 25V 4700uF, and it inputs the DC-DC converter circuit.