Getting Started - HP 8114A Service Manual

Some voltages on the Primary Section of the Power Supply are
Warning
dangerous and can kill. For your own safety do not touch these
parts. Using an isolating transformer may prevent these voltages
from being fatal, but electrical shocks from the unit can cause
serious discomfort, especially on capacitors CE406, CE407,
CE506, and CE507 (see Figure 5-4 for their position).

Getting Started

Before you start troubleshooting on the Power Supply Board some
setting-up is needed. Figure 5-5 shows what the setup looks like when
you are ready to start. You need the following equipment:
2. An isolating mains transformer
3. An Oscilloscope with grounding to the mains earth
4. A High-impedance Voltmeter
5. A 10062 resistor, 5W
6. A 300 resistor, 2W
First, remove the Power Supply Board mounted on a slide. Place the
PC Board in front of you on the bench, as shown in Figure 5-5
ISOLATING
M A I N S
FORMER
L
POWER
SUPPLY
SLIDE
Figure 5-5. Test Setup for the Power Supply Board
r
POWER
SUPPLY
BOARD
CONNECTOR
100 Q LOAD
FOR -5.2 V FOR +I0 VFL
SUPPLY SUPPLY
BP 8114A Service Guide
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Troubleshooting 5-7