Boards Sega Genesis / Mega Drive (1600 / VA revisions) REG1
REG1

7805

Voltage regulator TO-220 5 V Sega Genesis / Mega Drive · 1600 / VA revisions
7805 linear regulator: makes the board's +5 V from the DC adapter's input.
Datasheet
CART1 U1

Other components on Sega Genesis / Mega Drive

CART1 REG1 U1 U2 U3 U4

About this component

Everything on the board runs from this +5 V. It sits on a heatsink and runs warm; if it fails there's no power at all (check for about 9–10 V on IN and 5 V on OUT with the console switched on). Mega Drive adapters are centre-negative — a centre-positive adapter can damage the board, so check the adapter before replacing parts. Sources: https://www.ti.com/lit/ds/symlink/lm7800.pdf

Pinout & readings

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