Agilent Technologies 16900A, Service Manual

Page: 40 / 130

40 16900A, 16902A, and 16903A Service Guide
5
Troubleshooting
To check the power supply voltages
1
Turn off the instrument using one of the methods
descirbed in
“To power off the system" on page 48
2 Disconnect the instrument’s power cord, move the
instrument to a static safe work environment, then
remove the cover (instructions in
“To remove and replace
the cover" on page 52).
3
Disconnect all cables from the power supply except the
power cable.
4 Reconnect the instrument’s power cord, then apply power
to the instrument.
5
Using a digital volt meter, measure the power supply dc
voltages.
6 Referring to the graphics that follow, note problems with
the power supply, then return to the flowchart.
16900A and 16902A power supplies
The 16900A and 16902A systems have two power supplies.
One is 700 watts and the other is 500 watts. Use the
following graphics when measuring the voltages.
700 watt power supply voltages
WA R N I N G
Hazardous voltages exist on the power supply. This procedure is
to be performed by service-trained personnel aware of the
hazards involved, such as fire and electrical shock.