Table 4-1 Power Supply Components - Keithley 2700 Service Manual

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
+5VD CR104
+37V CR116, CR117
+15.7V CR102, CR115
-15.7V CR102, CR115
+5V, +5VRL, +5V2 CR103
+18V CR102
-18V CR102
Troubleshooting
Filter
C128, C156, C175, C281
C104
C148
C131
C146
C148
C131
4-5
Regulator
U144
U101
U125
U119
U124
-
-