Sam4s ER-5200 Service Manual page 50

7 Special Circuit Descriptions
7-4 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.
CPU
CLK,
DATA
LATCH&STB
7-6
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CLK, DATA, LATCH
STROBE
DRIVER
UCN5812
+30V,+5V,GND
Figure 7-10 VFD Diagram & Waveform
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0 1 2 3 4 5 6 7 8 9
Front & Rear VFD PBA
CLK,
DATA
LATCH&STB
10Digits
SAM4S ER-5200 Series