Troubleshooting 4-5
AC power is applied to the AC power module receptacle. Power is routed through the line
fuse and line voltage selection switch of the power module to the power transformer. The
power transformer has a total of four secondary windings for the various supplies.
AC voltage for the display filaments is taken from a power transformer secondary at F1 and
F2, and then routed to the display board.
Each DC supply uses a rectifier and a capacitive filter, and many supplies use an IC regula-
tor. Table 4-1 summarizes rectifier, filter, and regulator circuits for the various DC supplies.
Table 4-1
Power supply components
Supply Rectifier Filter Regulator
+5VD
+37V
+15.7V
-15.7V
+5V, +5VRL, +5V2
+18V
-18V
CR104
CR116, CR117
CR102, CR115
CR102, CR115
CR103
CR102
CR102
C128, C156, C175, C281
C104
C148
C131
C146
C148
C131
U144
U101
U125
U119
U124
-
-
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