via this auction
Pics of the inside below.
"This ESQ-1 has been completely overhauled and restored and features upgraded LED sliders. It includes an original Ensoniq ESQ-1 E2 PROM Storage Cartridge.You're not likely to find another ESQ-1 for sale like this one any time soon. Yes, you might see so-called "professionally refurbished" synths out there, but none like this.
There were no compromises when it came to restoring this ESQ-1. However, I did not attempt to restore this ESQ-1 cosmetically, so there are nicks, light scratches, and other signs of age and use. Read on to see what was done:
CLEANING:
This ESQ-1 has been completely stripped down, literally every part removed and thoroughly cleaned by hand.
For the body, buttons, and keys, I used hot, soapy water, brushes, cloths, and towels to remove all gunk and nastiness that built up over the years.
Every key was removed, cleaned, and if there were chips or holes they were filled and repaired.
The wires and contacts along the keybed were all cleaned and adjusted where necessary.
Every body part was removed and cleaned as described above - no body part was left in place before cleaning.
Each button was removed and cleaned, along with the display cover.
Old flux and grime and dust were all cleaned off the PCBs using appropriate solvents and cleaners. The jacks were all cleaned out. The cartridge port contacts were cleaned.
The pitch and mod wheels and mounting hardware were removed, scrubbed, and cleaned.
