Troubleshooting Auxiliary Power - HP 1652B Getting Started Manual

Troubleshooting
The + 5 volt auxiliary power line is protected by a current limiting circuit. If the
-
Auxiliary Power
current on pins 1 and 39 exceeds 2.3 amperes, the circuit will open. When the
short is removed, the circuit will reset in approximately 20 ms. If you suspect a
problem with this circuit, remove all loads from pins
1
and 39 and measure the
voltage between these pins and ground (pins 2 and 40) with a voltmeter. There
should be +5 volts at pins 1 and 39 after the 20 ms reset time.
If the +5 volts does not appear on one or both of these pins (pins 1 and 39),
replace the analyzer cable. If the + 5 volts still does not appear on these pins, refer
to chart 3 in figure 6C-3.
2 (GND)
01650E67
Figure 6C-13. Cable Power and Ground
Troubleshooting
SC-1 6
HP 16528/1653B
Service Manual