7 Special Circuit Descriptions
7-2
SAM4S ER-5200 Series
7-1 Power Circuit
7-1-1 VDISP : +30VDC
+30VAC is rectified by the bridge diode (BD1) and the capacitors(C9). And it is regulated by ZD1,Q8. And then
+30VDC Rear VFD Grid/Anode driving voltage is produced.
7-1-2 VDRV : +24VDC
+24VDC is produced by the bridge diode (BD2) and the capacitors(C5,C6,C7,C8). This voltage is used as a Cash
Drawer Solenoid driving voltage and a source voltage of the other voltage sources.
7-1-3
VCC :
+5VDC
+5Vdc Logic driving voltage is produced by the step-down dc-dc converter U2(34063A). That is, U2 produces
rectangular wave at the collector of Q9(A1010) by switching Q9 using +24VDC. This makes D6(IN5822) and L10
store energy. The voltage is smoothed by C14(470uF) and then +5Vdc Logic voltage is produced .
7-1-4 VPRT : +8.5VDC
+8.5VDC Thermal Printer driving voltage is produced by the step-down dc-dc converter U1(34063A). That is, U1
produces rectangular wave at the collector of Q10(A1010) by switching Q10 using +24VDC. This makes
D7(IN5822) and L8 store energy. The voltage is smoothed by C13(470uF) and then +8.5VDC thermal printer driving
voltage is produced .
7-1-5
VPH
:
+8.5Vdc
+8.5VDC Thermal Printer Head driving voltage is produced by VPH_ONOFF signal of CPU and the related
Circuit(Q13,Q14,15) on Main PWB. The Source Voltage is VPRT
(8.5V).
7-1-6 VBT : +Min 3.6Vdc
VBT Battery Voltage is charged through D28(SK14). The Source Voltage is VCC(5V). When AC Power is off, VBT is
supplied to SRAM, RTC for saving the data.
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