HP 16500B - Manual (Page 67)

To check the power supply voltages
Refer to chapter 6, "Replacing Assemblies," for instructions to remove or replace covers and
assemblies.
W A R N I N G
Hazard voltages exist on the power supply, the CRT, and the CRT driver board. This
procedure is to be performed by service-trained personnel aware of the hazards involved,
such as fire and electrical shock.
1 Turn off the instrument, disconnect the power cord, then remove the top cover.
2 Apply power to the instrument.
3 Using a DVM, measure the power supply voltages.
4 Note problems with the power supply, then return to the power supply flowchart.
Power Supply Voltages
Pin Supply/Signal Voltage Pin Supply/Signal Voltage
1-5 5 volt +5 V 21 Ground sense 0 V
6 +5 volt remote sense +5 V 22 Power valid +5 V
7-9 +3.5 volt +3.5 V 23 −
3.25 volt remote sense
−
3.25 V
10 +3.5 volt remote sense +3.5 V 24-30 −
3.25 volt
−
3.25 V
11 +12 volt +12 V 31 −
5.2 volt current limit +2.5 V
12 −
12 volt
−
12 V
32 −
5.2 volt remote sense
−
5.2 V
13 Not connected 33-37 −
5.2 volt
−
5.2 V
14-20 Ground 0 V 38 Remote on/off +12 V
Troubleshooting
To check the power supply voltages
5–24