Product Name: 
Mainboard of Roland RS-640 RS-540 Part Number 6700989010

Printer Compatibility: 
Roland RS-640,RS-540,RE-640,RF-640,VS-640,VS-640i 
Manufacturer: 
Roland Japan( or Roland Thailand)
Note:
All the mainboard of roland RS,RE,RF,VS,VS-xxxi are with same hardware now,but with diferente firmware. 
We sell those board without firmware,you need to install the firmware in your side after you recieve the mainboard.
If you need us to install the firmware for you,you need to contact us before the payment.