The power of the stepping motor driver (SMD) is controled by the host computer via the cable from CN2 to SGMD2 (STAGE) or SPMD2 (spectrometer).
AC100V is applied to this cable, and I think it is danger, especially when the cable and/or relay on the OCX module are damaged.
The following modification applied DC24V instead of AC100V to control the power of the SMD unit.
The AC-DC converter generates DC24V and it is applied to control the DC24V relay, replacing original AC100V relay.
I believe this improves safety.