Keysight N9000A - Page 172

172 Chapter 8
Power Supply/Midplane Troubleshooting
A6 Midplane Assembly Troubleshooting
NOTE Voltage readings are referenced to ACOM (TP4). All ohmmeter measurements
were taken from the power supply test point to ACOM. Due to capacitive effects,
wait for the ohmmeter readings to stabilize.
Power
Supply
Test
Point
Description Expected
Voltmeter Reading
(VDC)
Power ON
Expected
Ohmmeter Reading
(KΩ)
Power OFF
+32A TP3 32 Volt Analog supply +32 ± 2.0 1.3 kΩ
+15A TP6 15 Volt Analog supply +15 ± 1.0 260 Ω
+15SB TP2 15 Volt Standby supply +15 ± 1.0 264 Ω
+12D TP16 12 Volt Digital supply +12 ± 1.0 264 Ω
+9A TP7 9 Volt Analog supply +9 ± 1.0 120 Ω
+5.2A TP5 5.2 Volt Analog supply +5.2 ± 0.75 3.6 kΩ
+5.1D TP15 5.1 Volt Digital supply +5.1 ± 0.75 40 Ω
+5.1SB TP17 5.1 Volt Standby +5.1 ± 0.75 228 Ω
+3.35D TP13 3.35 Volt Digital supply +3.35 ± 0.75 47 Ω
+3.3A TP10 3.3 Volt Analog supply +3.3 ± 0.75 36 Ω
-5.2A TP11 -5.2 Volt Analog supply -5.2 ± 0.75 1.9 Ω
-7A TP8 -7 Volt Analog supply -7 ± 1.0 445 Ω
-15A TP9 -15 Volt Analog supply -15 ± 1.0 390 Ω
n/a TP1 Fan Positive supply 8.5 to 13.5 VDC
~8.8 VDC @ 25C
490 Ω
n/a TP4 Analog Common n/a n/a
n/a TP14 Digital Common n/a n/a
n/a TP12 Power OK +3.9 ± 0.75 9.2 kΩ