HP 16500A, Service Manual, Page: 107 / 144

Power Supply Voltages
Check the power supply voltages for indications of power supply problems.
1. Turn off the instrument, disconnect the power cord, then remove the top cover.
2. Using a DVM, measure the power supply voltages. Use figure 6-33 for power supply pin
assignments and use table 6-2 for voltages.
3. Return to the power supply flowchart.
Table 6-2. Power Supply Voltages
Pin Supply/Signal Voltage
Power Supply To Mother Board Connector
1-5 + 5 volt +5 V
6 +5 volt remote sense +5 V
7-9 +3.5 volt +3.5 V
10 +3.5 volt remote sense +3.5 V
11 +12 volt +12 V
12
−
12 volt
−
12 V
13 Not connected
14-20 Ground 0 V
21 Ground sense 0 V
22 Power valid +5 V
23
−
3.25 volt remote sense
−
3.25 V
24-30
−
3.25 volt
−
3.25 V
31
−
5.2 volt current limit
+2.5 V
32
−
5.2 volt remote sense
−
5.2 V
33-37
−
5.2 volt
−
5.2 V
38 Remote on/off +12 V
HP 16500A/16501A - Service
6-38