2-25 
 
2.2.2 Power System 
2.2.2.1 AC-DC Board 
The AC-DC board converts AC power into DC power to power the anesthesia machine. The 
AC-DC board of the A8 provides 19 V output, and that of the A9 provides 24 V output. The two 
AC-DC boards have different part numbers and are not interchangeable. Pay attention to the part 
numbers during servicing. 
 
Installation position of the AC-DC board 
 
AC-DC board (19 V output) 
 
AC-DC board (24 V output)