Theory
of
Operation
2-3
Power Supply Assembly
WARNING
DO NOT SERVICE THE POWER SUPPLY ASSEMBLY UNTIL THE
COMPUTER POWER CORD HAS BEEN UNPLUGGED FROM THE
AC
OUTLET AND THE POWER SUPPLY CAPACITORS HAVE
BEEN
COMPLETELY DISCHARGED.
SEE
CHAPTER 4
FOR
ADDI-
TIONAL INFORMATION.
The power supply assembly
is
a switching regulator assembly that provides power to the entire
computer. Figure
2-3
is
a functional block diagram of the assembly. The power supply assembly
converts ac line voltage to the following dc voltages. The actual voltages are listed
first;
the voltages
in
parentheses are the truncated designations used throughout the manual.
+ 17.5 to
+23
-17.5
to
-23
+ 16
+ 12.1
+ 12.1
-12.1
+6.7
+5.1
+3.85
-2.0
( + 19 unregulated)
( - 19 unregulated)
( + 16 bias supply voltage)
(+
12)
(+12MM)
(
-12)
(+6)
(+5)
(+3)
(
-2)
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