Keysight Technologies Infiniium 90000A Series, Service Manual

Page: 77 / 136

Troubleshooting
4
90000 A-Series Service Guide 77
Checking Probe Power Outputs
Probe power outputs are on the front panel, under each BNC input.
Refer to the following figure to check the power output at the connectors. Measure
the +3 V, -3 V, +12 V, and -12 V voltages with respect to the ground terminal on
the front panel, located near the Aux Out BNC.
Do not try to measure voltages at pins 3 through 7.
Any failure is likely caused by a problem with the probe power and control
assembly, the AutoProbe flex cable, the probe power and control cable, or the
power board.
Pin Supply
1 +3V
2 –3V
3 Offset
4 Data
5 & ring Probe ID
6 Clk
7 R
p
8 –12 V
9 +12 V