Sam4s ER-390 SERIES Service Manual page 41

7-3 Battery, RTC(Clock), Buzzer and Cash Drawer Circuits
7-3-4 Cash Drawer Driving Circuit
The circuit is used for opening cash drawer and driven by the Q5(MMBT2222A),Q1(KSD288-Y). When its state is
high level signal, Q5(MMBT2222A) or Q1 (KSD288-Y) drive the solenoid to open the cash drawer. As an optional
item, we provide sensor switch (we call it a compulsory switch) which checks the drawer whether it is opened or not.
This sensor switch turns on for the drawer open condition, and turns off for the other.
Caution: Make sure that the Cash Drawer solenoid resistance is more than 20Ω
7-3-5 VFD Display Block Circuits
This uses 10digit Fluorescent Display and uses UCN5812AF (is located on the Front VFD PCB) for the driver. CPU
sends Display data to the driver repeatedly having given time interval in series and then Fluorescent Display is operated.
CLK, DATA, LATCH
STROBE
CPU
+30V,+5V,GND
SAM4S ER-390 SERIES
R3
4.7K
DRAWER
VCC
SEN_DWRCOMP
Figure 7-6 Cash Drawer Block Circuit
DRIVER
UCN5812
Figure 7-7 VFD Diagram
Q5
MMBT2222A
3
1
2 1
R5
10K
Q1
KSD288
R1
10K
L4
L1
C72
100nF CON-BOX;4P,2.5MM,ST(YH)
0 1 2 3 4 5 6 7 8 9
Front & Rear VFD PBA
7 Special Circuit Descriptions
VDRV VDRV
D1
M4
CN3:4
4
CN3:3
3
2
3
CN3:2
2
CN3:1
1
10Digits
7-5