The next step in detaching the Main PCB Assembly from the Ensoniq SQ-2 is removing three mounting screws.

The one circled here is at the Main Board's left-front corner.

The mounting screw circled here is at the Board's right-front corner, hidden beneath a ribbon cable.

Finally, behind the right-front screw, a third screw holds down a PCB mounting brace.

With the three mounting screws removed, the SQ-2 Main Board is free.

Here you see the lithium coin cell battery that was reading low to the computer.

This battery powers the onboard memory chips when the Ensoniq SQ-2 is turned off.

To unsolder the battery, first flip over the PCB Assembly (right).