Specifications

12.4 POWER DISTRIBUTION
The DF uses three DC power levels: +24 volts, +12 volts, and +5 volts.
When the main switch is turned on, the main transformer receives the wall
outlet ac power through the ac drive board and outputs 10 volts ac and 26
volts ac to the option dc power supply board. The option dc power supply
board then converts the 10 volts ac input to +5 volts dc and the 26 volts ac
input to +24 volts. Then, thoes two dc voltsges are supplied to the DF main
board.
The regulator IC on the DF main board further steps down the +24V to +12V.
115Vac
26Vac
10Vac
DF Main Board
(PCB1)
220/240Vac
AC Drive Board
(PCB2)
Option
DC Power
Supply Board
(PCB5)
Regulator
IC
5V
+12V+24V
+24V (VA)
+5V (VC)
Main
Transformer
(TR1)
1 December 1990
11-28