Servicing The Power Supply; Theory Of Operation; Line Voltage Selector And Transformer; Bridge Rectifiers And Regulators - HP 8112A Operating, Programming And Servicing Manual

Servicing the Power Supply

Theory of Operation

Introduction
Line Voltage Selector
and Transformer
Bridge Rectifiers and
Regulators
The HP 8112A power supply unit occupies part of the main
board Al and consists of the following four parts, as shown in
Figure 10.2-l:

Line voltage selector and transformer

n
Voltage rectifiers and regulators
n

Voltage and current sensing circuits

n
Power-down detection circuit
n
Refer to Figure 10.2-2. The line-voltage selector-switches, S2 and
S3, connect the incoming line-voltage lines to an appropriate pair of
transformer inputs. The transformer provides six ac outputs and an
earth line to the bridge rectifiers.
There are three bridge rectifiers, all modular and therefore
replaceable:
1
Servicing the Power Supply 10.2-I
.
.
+ 15v