BIXOLON IMPACT PRINTER SRP-270 - Manual (Page 31)

Rev. 3.02 - 31 -
SRP-270
4-3 Special Circuit Descriptions
4-3-1 Power Circuit
This system is operated under 110Vac or 230Vac. The power circuit supplies the three differential DC voltage
sources.
[Figure 4-3 Power Block Diagram]
1) Drawer Driving and Feed, Auto Cutter Motor Voltage : +24Vdc
+24VDC is supplied from SMPS. This Voltage is smoothed by capacitors (C1,6,39).
This voltage is used as a Printer Head, Printer Motor, Cash Drawer Solenoid Driving voltage and a source
voltage of the +5V voltage sources.
2) Logic IC Driving Voltage: +5V
+5Vdc Logic driving voltage is produced by the step-down dc-dc converter U1(34063A). That is, U1 produces
rectangular wave. This makes D2 (EK04) and L6 store energy. The voltage is smoothed by C8 (470uF) and
then +5Vdc Logic voltage is produced.
No. VOLTAGE DESCRIPTION
1 +24VDC Cash Drawer Solenoid Driving / Step Motor Voltage
2 +5VDC Logic IC Driving Voltage / Sensor