Lexicon PCM 70 reverb
This well known Lexicon reverb was introduced 1985. It was the first Lexicon reverb featuring MIDI.
There are soldering points for a second audio input (left of the mono input, labeled J4) and some additional RAM (U32, U33, U46, U47) seen on the board. I have no clue, if there was a different Lexicon model using these, or if this board was designed also to serve for a never released product of Lexicon.
This unit was just changed from working on 220 V to 240 V. It is just one cable that needs to soldered onto a different, well marked point. You may adjust the 5 V after doing so. It is well documented in the service manual you find online.