Circuitry; Power Circuit - Samsung ER-3715 Series Service Manual

2.CIRCUITRY
2-1 POWER CIRCUIT
1) VPP(+20V):MARK A ON PCB
2) VCC(+5V):MARK E ON PCB
3) VF(+5V):MARK C ON PCB
4) VDI(-30¥) :MARK B ON PCB
The VDI voltage
is used
for providing
to GRID
and PLATE
of the DIGITRON.